STIHL MS 440 Chainsaw Instruction Manual

MS 440, MS 440 W, MS 440 C Chainsaw
Instruction Manual

MS 440 Chainsaw

Warning!
This saw is capabale of servere kickback which may cause serious or fatal injury. Only for users with extraordinary cutting needs and experience and training dealing with kickback. Chainsaws with significantly reduced kickback potential are available. STIHL  recommends the use of STIHL reduced kickback bar and low kickback chain. * see “Guide to Using this Manual“
Allow only persons who understand this Manual to operate your chainsaw.
To receive maximum performance and satisfaction from your STIHL chainsaw, it is important that you read and understand the maintenance and safety precautions, starting on page 3, before using your chainsaw.
Contact your STIHL dealer or the STIHL distributor for your area if you do not understand any of the instructions in this Manual.
Warning!
Because a chainsaw is a high-speed wood-cutting tool, some special safety precautions must be observed as with any other power saw to reduce the risk of personal injury.
Careless or improper use may cause serious or even fatal injury.
STIHL’s philosophy is to continually improve all of its products. As a result, engineering changes and improvements are made from time-to-time. If the operating characteristics or the appearance of your chainsaw differs from those described in this Manual, please contact your STIHL dealer for information and assistance.

Guide to Using this Manual

Pictograms
All the pictograms attached to the machine are shown and explained in this manual.
The operating and handling instructions are supported by illustrations.

Symbols in text
The individual steps or procedures described in the manual may be marked in different ways:

• Step or procedure without direct reference to an illustration.

Description of step or procedure that refers directly to the illustration and contains item numbers that appear in the illustration.
Example:
Loosen the screw (1)
Lever (2) …
In addition to the operating instructions, this manual may contain paragraphs that require your special attention. Such paragraphs are marked with the symbols described below:
Warning where there is a risk of an accident or personal injury or serious damage to property.
Warning where there is a risk of damaging the machine or individual components.
Note or hint which is not essential for using the machine, but may improve the operator’s understanding of the situation and result in better use of the machine.
Note or hint on correct procedure in order to avoid damage to the environment.

• Equipment and features
  This instruction manual refers to several models with different features. Components that are not installed in all models and related applications are marked thus *.
  Such components are available as special accessories from your STIHL dealer.
  Engineering improvements
  STIHL’s philosophy is to continually improve all of its products. As a result, engineering changes and improvements are made from time to time. If the operating characteristics or the appearance of your machine differ from those described in this manual, please contact your STIHL dealer for assistance.
  Therefore, we cannot be responsible for changes, modifications or improvements not covered in this manual.

Some Important Safety Precautions for Chain Saw Users

A.
A Summary of Warnings on kickback and other Selected Risks – Taken Primarily from ANSI B 175.1 (See also “Safety Precautions“ section of this Owner’s Manual)
Warning!
Kickback may occur when the nose or tip of the guide bar touches an object, or when the wood closes in and pinches the saw chain in the cut. Tip contact in some cases may cause a lightning fast reverse reaction, kicking the guide bar up and back towards the operator. Pinching the saw chain along the top of the guide bar may push the guide bar rapidly back towards the operator. Either of these reactions may cause you to lose control of the saw which could result in serious personal injury.
Section 5.11 of ANSI B 175.1-2000 sets certain performance and design criteria related to chainsaw kickback. STIHL has developed a color code system using green and yellow to help you select a powerhead, bar and chain combination that complies with the kickback requirements of the ANSI Standard. See the sections entitled “Safety Precautions” and “Specifications” of this manual.
Do not rely exclusively upon the safety devices built into your saw. As a chainsaw user, you should take several steps to keep your cutting jobs free from accident or injury.

1. With a basic understanding of kickback, you can reduce or eliminate the element of surprise. Sudden surprise contributes to accidents.
2. Keep a good firm grip on the saw with both hands, the right hand on the rear handle, and the left hand on the front handle, when the engine is running. Use a firm grip with thumbsand fingers encircling the chainsawhandles. A firm grip will help you reduce kickback and maintain control of the saw. Don’t let go.
3. Make sure the area in which you arecutting is free from obstructions. Donot let the nose of the guide bar contact a log, branch, or any other obstruction that could be hit while you are operating the saw.
4. Cut at high engine speeds.
5. Do not overreach or cut above shoulder height.
6. Follow manufacturer’s sharpening and maintenance instructions for the saw chain.
7. Only use replacement bars and chains specified by the manufacturer or the equivalent.
8. Reduced kickback bars and low kickback chains are designed to reduce the risk of kickback injury. Ask your STIHL dealer about these devices.

B.
Other Safety Precautions
Warning!

1. Do not operate a chainsaw with one hand! Serious injury to the operator, helpers, bystanders, or any combination of these persons may result from one-handed operation. A chainsaw is intended to be used with two hands.
2. Do not operate a chainsaw when you are fatigued.
3. Use safety footwear; snug-fitting clothing; protective gloves; and eye, hearing, and head protection devices.
4. Use caution when handling fuel. Move the chainsaw at least 10 feet (3 m) from the fueling point before starting the engine.
5. Do not allow other persons to be near the chainsaw when starting or cutting with the chainsaw. Keep bystanders and animals out of the work area.
6. Do not start cutting until you have a clear work area, secure footing, and a planned retreat path from the falling tree.
7. Keep all parts of your body away from the saw chain when the engine is running.
8. Before you start the engine, make sure that the saw chain is not contacting anything.
9. Carry the chainsaw with the engine stopped, the guide bar and saw chain to the rear, and the muffler away from your body.
10. Do not operate a chainsaw that is damaged, improperly adjusted, or not completely and securely assembled. Be sure that the saw chain stops moving when the throttle trigger is released.
11. Shut off the engine before setting the chainsaw down.
12. Use extreme caution when cutting small size brush and saplings because slender material may catch the saw chain and be whipped toward you or pull you off balance.
13. When cutting a limb that is under tension be alert for springback so that you will not be struck when the tension in the wood fibers is released.
14. Keep the handles dry, clean, and free of oil or fuel mixture.
15. Operate the chainsaw only in wellventilated areas.
16. Do not operate a chainsaw in a tree unless you have been specifically trained to do so.
17. All chainsaw service, other than the items listed in the Owner’s Manual maintenance instructions, should be performed by competent chainsaw service personnel.(For example, if improper tools are used to remove the flywheel or if an improper tool is used to hold the flywheel in order to remove the clutch, structural damage to the flywheel could occur and could be subsequently cause the flywheel to burst).
18. When transporting your chainsaw, use the appropriate chain guard (scabbard).

Other important safety precautions are contained in the body of the Owner’s Manual especially in the General Safety Precautions.
Note:
When using a chainsaw for logging purposes, refer to the Code of Federal Regulations, Parts 1910 and 1928.

Safety Precautions
The use of any chainsaw may be hazardous. The saw chain has many sharp cutters. If the cutters contact your flesh, they will cut you, even if the chain is not moving. At full throttle, the chain speed can reach 45 mph (20 m/s). It is important that you read, fully understand and observe the following safety precautions and warnings. Read the Owner’s Manual and the Safety Precautions periodically.
Pay special attention to the section on reactive forces.
Warning!
Reactive forces, including kickback, can be dangerous. Careless or improper use of any chainsaw may cause serious or fatal injury.
All safety precautions that are generally observed when working with an axe or a hand saw also apply to the operation of chainsaws. However, because a chainsaw is a high-speed, fast-cutting power tool, special safety precautions must be observed to reduce the risk of personal injury.
Have your STIHL dealer show you how to operate your chainsaw. Observe all applicable local safety regulations, standards and ordinances.
Warning!
Minors should never be allowed to use a chainsaw. Bystanders, especially children, and animals should not be allowed in the area where a chainsaw is in use. Never let the saw run unattended. Store it in a locked place away from children and empty the fuel tank before storing for longer than a few days.
Do not lend or rent your chainsaw without the Owner`s Manual. Be sure that anyone using your saw reads and understands the information contained in this manual.
These safety precautions and warnings apply to the use of all STIHL chainsaws. Different models may have different parts and controls. See the appropriate section of your Owner’s Manual for a description of the controls and function of the parts of your model saw.
Safe use of a chainsaw involves

1. the operator
2. the saw
3. the use of the saw.

THE OPERATOR

Physical Condition
You must be in good physical condition and mental health and not under the influence of any substance (drugs, alcohol) which might impair vision, dexterity or judgement.
Do not operate a chainsaw when you are fatigued. Be alert – If you get tired while operating your chainsaw, take a break. Tiredness may result in loss of control. Working with any chainsaw can be strenuous. If you have any condition that might be aggravated by  strenuous work, check with your doctor before operating a chainsaw.
Warning!
Prolonged use of chainsaws (or other machines) exposing the operator to vibrations may produce whitefinger disease (Raynaud’s phenomenon) or carpal tunnel syndrome.
These conditions reduce the hand’s ability to feel and regulate temperature, produce numbness and burning sensations and may cause nerve and circulation damage and tissue necrosis.
All factors which contribute to whitefinger disease are not known, but cold weather, smoking and diseases or physical conditions that affect blood vessels and blood transport, as well as high vibration levels and long periods of exposure to vibration are mentioned as factors in the development of whitefinger disease. In order to reduce the risk of whitefinger disease and carpal tunnel syndrome, please note the following:

• Many STIHL models are available with an anti-vibration (AV) system designed to reduce the transmission of vibrations created by the engine and cutting attachment to the operator’s handsAn AV system is recommended for those persons using chainsaws on a regular or sustained basis.
• Wear gloves and keep your hands warm. Heated handles, which are available on most STIHL powerheads, are recommended for cold weather use.
• Keep the saw chain sharp and the saw, including the AV system, well maintained. A dull chain will increase cutting time, and pressing a dull chain through wood will increase the vibrations transmitted to your hands. A saw with loose components or with damaged or worn AV buffers will also tend to have higher vibration levels.
• Maintain a firm grip at all times, but do not squeeze the handles with constant, excessive pressures. Take frequent breaks.

All the above mentioned precautions do not guarantee that you will not sustain whitefinger disease or carpal tunnel syndrome. Therefore, continual and regular users should monitor closely the condition of their hands and fingers. If any of the above symptoms  appear, seek medical advice immediately.
Warning!
The ignition system of your unit produces an electromagnetic field of a very low intensity. This field may interfere with some pacemakers. To reduce the risk of serious or fatal injury, persons with pacemaker should consult their physician and the pacemaker manufacturer before operating this tool.
Proper Clothing
Warning!
To reduce the risk of injury, the operator should wear proper protective apparel.
Clothing must be sturdy and snug-fitting, but allow complete freedom of movement. Avoid loosefitting jackets, scarfs, neckties, jewelry, flared or cuffed pants, unconfined long hair or anything that could become entangled with the saw or brush. Wear overalls or jeans with a reinforced cut retardant insert or cut retardant chaps.
Protect your hands with gloves when handling saw and saw chain. Heavy-duty, nonslip gloves improve your grip and protect your hands.
Good footing is most important in chainsaw work. Wear sturdy boots with nonslip soles. Steeltoed safety boots are recommended.
Never operate a chainsaw unless wearing goggles or properly fitted safety glasses with adequate top and side protection complying with your national standard.
Wear an approved safety hard hat to protect your head. Chainsaw noise may damage your hearing. Always wear sound barriers (ear plugs or ear mufflers) to protect your hearing. Continual and regular users should have their hearing checked regularly.
THE SAW
Parts of the chainsaw; for illustrations and definitions of the parts see the chapter on “Main Parts of Saw”.
Warning!
Never modify a chainsaw in any way. Only attachments and parts supplied by STIHL or expressly approved by STIHL for use with the specific STIHL saw models are authorized. Although certain unauthorized attachments are usable with the STIHL powerhead, their use may, in fact, be extremely dangerous.

THE USE OF THE SAW

Transporting the chainsaw
Warning!
Always stop the engine before putting a chainsaw down or carrying it. Carrying a chainsaw with the engine running is extremely dangerous.
Accidental acceleration of the engine can cause the chain to rotate. During operation, the powerhead muffler and the material around it reach extremely high temperatures. Avoid touching the hot muffler, you could receive serious burns.
By hand: When carrying your saw by hand, the engine must be stopped and the saw must be in the proper position.
Grip the front handle and place the muffler away from the body. The chain guard (scabbard) should be over the chain and the guide bar, which should point backwards. When carrying your saw, the bar should be behind you.
By vehicle: When transporting in a vehicle, keep chain and bar covered with the chain guard. Properly secure your saw to prevent turnover, fuel spillage and damage to the saw or vehicle.
Preparation for the use of the saw
Take off the chain guard and inspect for safety in operation. For assembly, follow the procedure described in the chapter “Mounting the Bar and Chain” of your Owner’s Manual.
STIHL Oilomatic chain, guide bar and sprocket must match each other in gauge and pitch.
Before replacing any bar and chain, see the sections on “Specifications”, “Kickback” and the “ANSI B 175.1-2000 chainsaw kickback standard” in this manual.
Warning!
Proper tension of the chain is extremely important. In order to avoid improper setting, the tensioning procedure must be followed as described in your manual. Always make sure the hexagonal nut(s) for the sprocket cover is (are) tightened securely after tensioning the chain. Never start the saw with the sprocket cover loose. Check chain tension once more after having tightened the nut(s) and thereafter at regular intervals (whenever the saw is shut off). If the chain becomes loose while cutting, shut off the engine and then tighten. Never try to adjust the chain while the engine is running!
Fueling
Your STIHL chainsaw uses an oil-gasoline mixture for fuel (see chapter “Fuel” of your Owner’s Manual).
Warning!
Gasoline is an extremely flammable fuel. If spilled or ignited by a spark or other ignition source, it can cause fire and serious burn injury or property damage. Use extreme caution when handling gasoline or fuel mix.
Do not smoke or bring any fire or flame near the fuel or the chainsaw. Note that combustible fuel vapors may be vented from the fuel system.

Fueling Instructions

Warning!
Fuel your chainsaw in well-ventilated areas, outdoors only. Always shut off the engine and allow it to cool before refueling. Gasoline vapor pressure may build up inside the gas tank depending on the fuel used, the weather conditions, and the venting system of the tank. In order to reduce the risk of burns or other personal injury from escaping gas vapor and fumes, remove the fuel filler cap on the STIHL product carefully so as to allow any pressure build-up in the tank to release slowly. Never remove fuel filler cap while engine is running.
Select bare ground for fueling and move at least 10 feet (3 m) from fueling spot before starting the engine. Wipe off any spilled fuel before starting your saw, and check for leakage.
Warning!
Check for fuel leakage while refueling and during operation. If fuel or oil eakage is found, do not start or run the engine until leak is fixed and spilled fuel has been wiped away. Take care not to get fuel on your clothing. If this happens, change your clothing immediately. Different models may have different fuel caps.

Cap with Grip

Warning!
In order to reduce the risk of fuel spillage and fire from an improperly tightened fuel cap, correctly position and tighten the fuel cap in the fuel tank opening.
To do this with this STIHL cap, raise the grip on the top of the cap until it is upright at a 90° angle. Insert the cap and the fuel tank opening with the triangular marks on the grip of the cap and on the fuel tank opening lining up. Using the grip, turn the cap firmly clockwise as far as it will go (approx. a quarter turn).
Fold the grip flush with the top of the cap. If the grip does not lie completely flush with the cap and the detent on the grip does not fit in the corresponding recess in the filler neck, the cap is not properly seated and tightened and you must repeat the above steps.

Slotted Cap

Warning!
Unit vibrations can cause an improperly tightened fuel filler cap to loosen or come off and spill quantities of fuel. In order to reduce the risk of fuel spillage and fire, tighten fuel filler cap by hand with as much force as possible.
The screwdriver end of the STIHL combination wrench or other similar tool can be used as an aid in tightening slotted fuel filler caps.
See “Fueling” chapter in your Owner’s Manual. Starting
The chain brake must be engaged when starting the saw.
Warning!
Your chainsaw is a one-person saw. Do not allow other persons to be near the running chainsaw. Start and operate your saw without assistance. For specific starting instructions, see the appropriate section of the Owner’s Manual. Proper starting methods reduce
the risk of injury. Do not drop start. This method is very dangerous because you may lose control of the saw.
There are two recommended methods for starting your chainsaw.
With the first recommended method, the chainsaw is started on the ground. Make sure the chain brake is engaged (see “Chain Brake” chapter in your Owner’s Manual) and place the chainsaw on firm ground or other solid surface in an open area. Maintain good balance and secure footing.
Grip the front handlebar of the saw firmly with your left hand and press down. For saws with a rear handle level with the ground, put the toe of your right foot into the rear handle and press down. With your right hand pull out the starter grip slowly until you feel a definite resistance and then give it a brisk, strong pull.
The second recommended method for starting your chainsaw allows you to start the saw without placing it on the ground. Make sure the chain brake is engaged, grip the front handle of the chainsaw firmly with your left hand. Keep your arm on the front handle in a locked (straight) position. Hold the rear handle of the saw tightly between your legs just above the knees. Maintain good balance and secure footing. Pull the starting grip slowly with your right hand until you feel a definite resistance and then give it a brisk, strong pull.
Warning!
Be sure that the guide bar and chain are clear of you and all other obstructions and objects, including the ground. When the engine is started, the engine speed with the starting throttle lock engaged will be fast enough for the clutch to engage the sprocket and, if the chain brake is not activated, turn the chain. If the upper quadrant of the tip of the bar touches any object, it may cause kickback to occur (see section on reactive forces). To reduce this risk, always engage the chain brake before starting. Never attempt to start the chainsaw when the guide bar is in a cut or kerf.
Warning!
When you pull the starter grip, do not wrap the starting rope around your hands. Do not allow the grip to snap back, but guide the starter rope slowly back to permit the rope to rewind properly. Failure to follow this procedure may result in injury to hand or fingers and may damage the starter mechanism.

Important adjustments

Warning!
To reduce the risk of personal injury from loss of control or contact with the running chain, do not use a saw with incorrect idle adjustment. At correct idle speed, the chain should not rotate. For directions to adjust idle speed, see the appropriate section of your Owner’s Manual. If you cannot set the correct idle speed, have your STIHL dealer check your saw and make proper adjustments or repairs. After adjusting a chain, start the saw, let the engine run for a while, then switch engine off and recheck chain tension. Proper chain tension is very important at all times.

Catalytic converter
Warning!
Some STIHL chainsaw models are equipped with a catalytic converter, which is designed to reduce the exhaust emissions of the engine by a chemical process in the muffler. Due to this process, the muffler does not cool down as rapidly as conventional mufflers when the engine returns to idle or is shut off. To reduce the risk of fire and burn injuries, specific safety precautions must be observed.
Warning!
Since a muffler with a catalytic converter cools down less rapidly than conventional mufflers, never set your chainsaw down on or near dry brush, grass, wood chips or other combustible materials while it is still hot. Let the engine cool down sitting on concrete, metal, bare ground or solid wood (e.g. the trunk of a felled tree) away from any combustible substances.
Warning!
To reduce the risk of fire or burn injury, let the unit cool down before refueling your chainsaw after use.
Warning!
Never disassemble or modify your muffler. The muffler could be damaged and cause an increase in heat radiation or sparks, thereby increasing the risk of fire or burn injury. You may also permanently damage the engine. Have your muffler serviced and repaired by your STIHL Servicing Dealer only.
Warning!
To reduce the risk of fire or burn injury, keep the area around the muffler clean. Remove all debris such as pine needles, branches or leaves.
Warning!
An improperly mounted or damaged cylinder housing or a damaged/ deformed muffler shell may interfere with the cooling effect of the catalytic converter. To reduce the risk of fire or burn injury, do not continue work with a damaged or improperly mounted cylinder housing or a damaged/ deformed muffler shell. Your catalytic converter is furnished with screens designed to reduce the risk of fire from the emission of hot particles. Due to the heat from the catalytic reaction, these screens will normally stay clean and need no service or maintenance. If you experience loss of performance and yoususpect a clogged screen, have your muffler maintained by a STIHL Servicing Dealer.

Working Conditions

Operate the chainsaw under good visibility and daylight conditions only.
Warning!
Your chainsaw produces poisonous exhaust fumes as soon as the combustible engine is running. These gases (e.g. carbon monoxide) may be colorless and odorless. To reduce the risk of serious or fatal injury from breathing toxic fumes, never run the chainsaw indoors or in poorly ventilated locations. Ensure proper ventilation when working in trenches or other confined areas.
Warning!
Use of this product (including sharpening the saw chain) can generate dust, mists and fumes containing chemicals known to cause respiratory disease, cancer, birth defects, or other reproductive harm. If you are unfamiliar with the risks associated with the particular dust, mist or fume at issue, consult your employer, governmental agencies such as OSHA and NIOSH and other sources on hazardous materials. California and some other authorities, for instance, have published lists of substances known to cause cancer, reproductive toxicity, etc. Control dust (such as sawdust), mists (such as oil mist from chain lubrication) and fumes at the source where possible.
In this regard use good work practices and follow the recommendations of OSHA / NIOSH and occupational and trade associations. When the inhalation of toxic dust, mists and fumes cannot be eliminated, the operator and any bystanders should always wear a respirator approved by NIOSH / MSHA for the type substance at issue.
Warning!
Breathing asbestos dust is dangerous and can cause severe or fatal injury, respiratory illness or cancer. The use and disposal of asbestos containing products have been strictly regulated by OSHA and the Environmental Protection Agency. Do not cut or disturb asbestos, asbestos containing products (e.g. asbestos containing drywall or other construction products), or products such as pipes which are wrapped or covered with asbestos insulation. If you have any reason to believe that you might be cutting asbestos, immediately contact your employer or a local OSHA representative.
The muffler and other parts of the engine (e.g. fins of the cylinder, spark plug) become hot during operation and remain hot for a while after stopping the engine. To reduce risk of burns do not touch the muffler and other parts while they are hot. Don’t work alone. Keep within calling distance of others in case help is needed.
Your chainsaw is equipped with a chain catcher. It is designed to reduce the risk of personal injury in the event of a thrown or broken chain. From time to time the catcher may be damaged or removed.
To reduce the risk of personal injury, do not operate a chainsaw with a damaged or missing catcher.
Inspect buffers periodically. Replace damaged, broken or excessively worn buffers immediately, since they may result in loss of control of the saw.
A “sponginess” in the feel of the saw, increased vibration or increased “bottoming” during normal operation may indicate damage, breakage or excessive wear. Buffers should always be replaced in sets. If you have any questions as to whether the buffers should be replaced, consult your STIHL servicing dealer.
Warning!
Take extreme care in wet and freezing weather (rain, snow, ice). Put off the work when the weather is windy, stormy or rainfall is heavy.
Warning!
Avoid stumbling on obstacles such as stumps, roots or rocks and watch out for holes or ditches. Clear the area where you are working. Be extremely cautious when working on slopes or uneven ground. There is increased danger of slipping on freshly debarked logs.
Warning!
To reduce the risk of serious or fatal injury to the operator or bystanders, never use the saw with one hand.
You cannot control reactive forces and you may lose control of the saw, which can result in the skating or bouncing of the bar and chain along the limb or log.
Even for those compact saws designed for use in confined spaces, one-handed operation is dangerous because the operator may lose control. Cutting Instructions
Grip: Always hold the saw firmly with both hands when the engine is running. Place your left hand on front handle bar and your right hand on rear handle and throttle trigger. Left-handers should follow these instructions too.
Wrap your fingers tightly around the handles, keeping the handles cradled between your thumb and forefinger. With your hands in this position, you can best oppose and absorb the push, pull and kickback forces of your saw without losing control (see section on reactive forces). Make sure your chainsaw handles and grip are in good condition and free of moisture, pitch, oil or grease.
**Warning!
Do not operate your chainsaw with the starting throttle lock engaged. Cutting with the starting throttle lock engaged does not permit the operator proper control of the saw or chain speed. Warning!
Never touch a chain with your hand or any part of your body when the engine is running, even when the chain is not rotating. The chain continues to rotate for a short period after the throttle trigger is released.
Warning!
Do not cut any material other than wood or wooden objects. Use your chainsawing only. It is not designed for prying or shoveling away limbs, roots or other objects. When sawing, make sure that the saw chain does not touch any foreign materials such as rocks, fences, nails and the like. Such objects may be flung off, damage the saw chain or cause the saw to kickback.
Warning!
In order to keep control of your saw, always maintain a firm foothold. Never work on a ladder, or on any other insecure support. Never use the saw above shoulder height.
Warning!
Never work in a tree unless you have received specific, professional training for such work, are properly secured (such as tackle and harness system or a lift bucket), have both hands free for operating the chainsaw in a cramped environment and have taken proper precautions to avoid injury from falling limbs or branches. Position the chainsaw in such a way that your body is clear of the cutting attachment whenever the engine is running. Stand to the left of cut while bucking.
Don’t put pressure on the saw when reaching the end of a cut. The pressure may cause the bar and rotating chain to pop out of the cut or kerf, go out of control and strike the operator or some other object. If the rotating chain strikes some other object, a reactive force may cause the moving chain to strike the operator.
Reactive forces including kickback
Warning!**
Reactive forces may occur any time the chain is rotating. Reactive forces can be dangerous! In any chainsaw, the powerful force used to cut wood can be reversed (and work against the operator). If the rotating chain is suddenly stopped by contact with any solid object like a log or branch or is pinched, there active forces may occur instantly. These reactive forces may result in loss of control which may, in turn, cause serious or fatal injury. An understanding of the causes of these reactive forces may help you avoid loss of control.
The most common reactive forces are

• kickback,
• pushback,
• pull-in.

Kickback:
Kickback may occur when the moving saw chain near the upper quadrant of the bar nose contacts a solid object or is pinched.  The reaction of the cutting force of the chain causes a rotational force on the chainsaw in the direction opposite to the chain movement. This may fling the bar up and back in an uncontrolled arc mainly in the plane of the bar. Under some cutting circumstances the bar moves towards the operator, who may suffer severe or fatal injury.
Kickback may occur, for example, when the chain near the upper quadrant of the bar nose contacts the wood or is pinched during limbing or when it is incorrectly used to begin a plunge or boring cut.
The greater the force of the kickback reaction, the more difficult it becomes for the operator to control the saw. Many factors influence the occurrence and force of the kickback reaction. These include chain speed, the speed at which the bar and chain contact the object, the angle of contact, the condition of the chain and other factors.
The type of bar and saw chain you use is an important factor in the occurrence and force of the kickback reaction. Some STIHL bar and chain types are designed to reduce kickback forces. STIHL recommends the use of reduced kickback bars and low kickback chains.
ANSI B 175.1-2000 chainsaw kickback standard
Section 5.11 of ANSI standard B 175.1-2000, sets certain performance and design criteria related to chainsaw kickback.
To comply with section 5.11 of ANSI B 175.1-2000:
a) saws with a displacement of less than 3.8 cubic inches (62 cm³).

• must, in their original condition, meet a 45° computer derived kickback angle when equipped with certain cutting attachments.
• and must be equipped with at least two devices to reduce the risk of kickback injury, such as a chain brake, low kickback chain, reduced kickback bar, etc.

b) saws with a displacement of 3.8 cubic inches (62 cm³) and above

• must be equipped with at least one device designed to reduce the risk of kickback injury such as a chain brake, low kickback chain, reduced kickback bar, etc.

The computer derived angles for saws below 3.8 cubic inch (62 cm³) displacement are measured by applying a computer program to test results from a kickback test machine.
Warning!
The computer derived angles of § 5.11 of ANSI B 175.1-2000 may bear no relationship to actual kickback bar rotation angles that may occur in real life cutting situations. Compliance with § 5.11 of ANSI B 175.1-2000 does not automatically mean that in a real life kickback the bar and chain will rotate at most 45°.
Warning!
In order for powerheads below 3.8 cubic inch (62 cm³) displacement to comply with the computed kickback angle requirements of § 5.11 of ANSI B 175.12000 use only the following cutting attachments:

• bar and chain combinations listed as complying in the “Specifications” section of the Owner’s Manual or
• other replacement bar and chain combinations marked in accordance with the standard for use on the powerhead or
• replacement chain designated “low kickback saw chain”.

See the section on “Low kickback saw chain and reduced kickback bars”
Devices for reducing the risk of kickback injury
STIHL recommends the use of the STIHL Quickstop chain brake on your power-head with green labeled reduced kickback bars and low kickback chains.
Warning!
To reduce the risk of injury, stop using the saw immediately if the chain brake does not function properly. Take the saw to your local STIHL Service Center! Do not use the saw until the problem has been rectified (see the section “Chain Brake”).
Quickstop chain brake
STIHL has developed a chain stopping system designed to reduce the risk of injury in certain kickback situations. It is called a Quickstop chain brake. The Quickstop is available as standard equipment on your STIHL chainsaw and is available for installation on most older STIHL saws. Ask your dealer to retrofit your older model saw with a chain brake. When a kickback occurs, the guide bar may rotate around the front handle. If the cutting position is such that the operator’s left hand is gripping the front handle behind the hand guard, and if the left hand rotates around the front handle and makes a sufficiently forceful contact with the front hand guard, which is the Quickstop activating lever, this contact will activate the Quickstop. The chain brake on most new model STIHL chainsaws can also be activated by inertia. See the chapter entitled “Chain Brake” of your Owner’s Manual.
Warning!
Never operate your chainsaw without a front hand guard. In a kickback situation this guard helps protect your left hand or other parts of your body. In addition, removal of the hand guard on a saw equipped with a chain brake will deactivate the chain brake.
Warning!
No Quickstop or other chain brake device prevents kickback. These devices are designed to reduce the risk of kickback injury, if activated, in certain kickback situations. In order for the Quickstop to reduce the risk of kickback injury, it must be properly maintained and in good working order. See the chapter entitled “Chain Brake” and “Maintenance, Repair and Storing” of your Owner’s Manual. In addition, there must be enough distance between the bar and the operator to ensure that the Quickstop has sufficient time to activate and stop the chain before potential contact with the operator.
Warning!
An improperly maintained chain brake may increase the time needed to stop the chain after activation, or may not activate at all.
Warning!
Never run the chainsaw above idle speed for more than 3 seconds when the chain brake is engaged or the chain is pinched or otherwise caught in the cut. Clutch slippage can cause excessive heat, leading to severe damage of the motor housing, clutch and oiler component and may interfere with the operation of the chain brake. If clutch slippage in excess of 3 seconds has occurred, allow the motor housing to cool before proceeding and check the operation of your chain brake as described in the chapter entitled “Chain Brake”. Also make sure that the chain is not turning at idle speed (see above “Important Adjustments”).
Low kickback saw chain and reduced kickback bars
STIHL offers a variety of bars and chains. STIHL reduced kickback bars and low kickback chains are designed to reduce the risk of kickback injury. Other chains are designed to obtain higher cutting efficiency or sharpening ease but may result in higher kickback tendency.
STIHL has developed a color codesystem to help you identify the STIHL reduced kickback bars and low kickback chains. Cutting attachments with green warning decals or green labels on the packaging are designed to reduce the risk of kickback injury. The matching of green decaled powerheads under 3.8 cubic inch (62 cm³) displacement with green labeled bars and green labeled chains gives compliance with the computed kickback angle requirements of ANSI B 175.1-2000 when the products are in their original condition. Products with yellow decals or labels are for users with extraordinary cutting needs and experience and specialized training for dealing with kickback.
STIHL recommends the use of its green labeled reduced kickback bars, green labeled low kickback chains and a STIHL Quickstop chain brake for both experienced and inexperienced chainsaw users.
Please ask your STIHL dealer to properly match your powerhead with the appropriate bar/chain combinations to reduce the risk of kickback injury. Green labeled bars and chains are recommended for all powerheads. See your “STIHL Bar and Chain Information” leaflet for details.
Warning!
Use of other, non-listed bar/chain combinations may increase kickback forces and increase the risk of kickback injury. New bar/chain combinations may be developed after publication of this literature, which will, in combination with certain powerheads, comply with § 5.11 of ANSI B 175.1-2000. Check with your STIHL dealer for such combinations.
Warning!
Reduced kickback bars and low kickback chains do not prevent kickback, but they are designed to reduce the risk of kickback injury. They are available from your STIHL dealer.
Warning!
Even if your saw is equipped with a Quickstop, a reduced kickback bar and/ or low kickback chain, this does not eliminate the risk of injury by kickback. Therefore, always observe all safety precautions to avoid kickback situations.
Low kickback chain
Some types of saw chain have specially designed components to reduce the force of nose contact kickback. STIHL has developed low kickback chain for your powerhead.
“Low kickback saw chain” is a chain which has met the kickback performance requirements of § 5.11.2.4 of ANSI B 175.1-2000 (Safety Requirements for Gasoline-Powered ChainSaws) when tested on a selected representative sample of chainsaws below 3.8 cubic inch (62 cm³) displacement specified in ANSI B 175.1-2000.
Warning!
There are potential powerhead and bar combinations with which low kickback saw chains can be used which have not been specifically certified to comply with the 45° computer derived kickback angle of § 5.11 of ANSI B 175.1-2000. Some low kickback chains have not been tested with all powerhead and bar combinations.
Warning!
A dull or improperly sharpened chain may reduce or negate the effects of the design features intended to reduce kickback energy. Improper lowering or sharpening of the depth gauges or shaping of the cutters may increase the chance and the potential energy of a kickback. Always cut with a properly sharpened chain.
Reduced kickback bar
STIHL green labeled reduced kickback bars are designed to reduce the risk of kickback injury when used with STIHL green labeled low kickback chains.
Warning!
When used with other, more aggressive chains, these bars may be less effective in reducing kickback, and may result in higher kickback forces.

Bow Guides

Warning!
Do not mount a bow guide on any STIHL chainsaw. Any chainsaw equipped with a bowguide is potentially very dangerous. The risk of kickback is increased with a bow guide because of the increased kickback contact area.
Low kickback chain will not significantly reduce the risk of kickback injury when used on a bow guide.
To avoid kickback
The best protection from personal injury that may result from kickback is to avoid kickback situations:

1. Hold the chainsaw firmly with both hands and maintain a secure grip.
2. Be aware of the location of the guide bar nose at all times.
3. Never let the nose of the guide bar contact any object. Do not cut limbs with the nose of the guide bar. Be especially careful when cutting small, tough limbs, small size brush and saplings which may easily catch the chain.
4. Don’t overreach.
5. Don’t cut above shoulder height.
6. Begin cutting and continue at full throttle.
7. Cut only one log at a time.
8. Use extreme caution when reentering a previous cut.
9. Do not attempt to plunge cut if you are not experienced with these cutting techniques.
10. Be alert for shifting of the log or other  forces that may cause the cut to close and pinch the chain.
11. Maintain saw chain properly. Cut with a correctly sharpened, properly tensioned chain at all times.
12. Stand to the side of the cutting path of the chainsaw.

A = Pull-in:
Pull-in occurs when the chain on the bottom of the bar is suddenly stopped when it is pinched, caught or encounters a foreign object in the wood. The reaction of the chain pulls the saw forward and may cause the operator to lose control.
Pull-in frequently occurs when the bumper spike of the saw is not held securely against the tree or limb and when the chain is not rotating at full speed before it contacts the wood.
Warning!
Use extreme caution when cutting small size brush and saplings which may easily catch the chain and pull you off balance.
To avoid pull-in

1. Always start a cut with the chain rotating at full speed and the bumper spike in contact with the wood.
2. Pull-in may also be prevented by using wedges to open the kerf or cut.

B = Pushback:
Pushback occurs when the chain on the top of the bar is suddenly stopped when it is pinched, caught or encounters a foreign object in the wood. The reaction of the chain drives the saw straight back toward the operator and may cause loss of saw control. Pushback frequently occurs when the top of the bar is used for cutting.
To avoid pushback

1. Be alert to forces or situations that may cause material to pinch the top of the chain.
2. Do not cut more than one log at a time.
3. Do not twist the saw when withdrawing the bar from a plunge cut or underbuck cut because the chain can pinch.

Cutting Techniques

Felling
Felling is cutting down a tree.
Before felling a tree, consider carefully all conditions which may affect the direction of fall, including:
The intended direction of the fall.
The natural lean of the tree.
Any unusually heavy limb structure.
Surrounding trees and obstacles.
The wind direction and speed.
Warning!
Always observe the general condition of the tree. Inexperienced users should never attempt to cut trees which are decayed or rotted inside or which are leaning or otherwise under tension. There is an increased risk that such trees could snap or split while being cut and cause serious or fatal injury to the operator or bystanders. Also look for broken or dead branches which could vibrate loose and fall on the operator. When felling on a slope, the operator should stand on the uphill side if possible. Felling Instructions:
When felling, maintain a distance of at least 21/2 tree lengths from the nearest person.
When felling in the vicinity of roads, railways and power lines, etc., take extra precautions. Inform the police, utility company or railway authority before beginning to cut.
Warning!
The noise of your engine may drown any warning call.
Warning!
There are a number of factors that may affect and change the intended direction of fall, e.g. wind, lean of tree, sloping ground, one-sided limb structure, wood structure, decay, snow load, etc. To reduce the risk of severe or fatal injury to yourself or others, look for these conditions prior to beginning the cut, and be alert for a change in direction while the tree is falling.

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Escape path
First clear the tree base and work area from interfering limbs and brush and clean its lower portion with an ax.
Then, establish two paths of escape (B) and remove all obstacles. These paths should be generally opposite to the planned direction of the fall of the tree (A) and about at a 45° angle. Place all tools and equipment a safe distance away from the tree, but not on the
escape paths.| Buttress roots
If the tree has large buttress roots, cut into the largest buttress vertically first
(horizontally next) and remove the resulting piece.| Gunning sight
When making the felling notch, use the gunning sight on the shroud and housing to check the required direction of fall:
• Position the saw so that the gunning sight points exactly in the direction you want the tree to fall.

Conventional cut
A = felling notch – determines the direction of the fall
For a conventional cut:

• Properly place felling notch perpendicular to the line of fall, close to the ground
• Cut down at app. 45-degree angle to a depth of about 1/5 to 1/4 of the trunk diameter
• Make second cut horizontal
• Remove resulting 45-degree piece

Open-face technique
A = felling notch – determines the direction of the fall
For an open-face cut:

• Properly place felling notch perpendicular to the line of fall, close to the ground
• Cut down at app. 50-degree angle to a depth of app.1/5 to 1/4 of the trunk diameter
• Make second cut from below at app. 40 degree angle
• Remove resulting 90-degree piece

Making sapwood cuts

• For medium sized or larger trees make cuts at both sides of the trunk,
• at same height as subsequent felling cut.
• Cut to no more than width of guide bar.

This is especially important in softwood in summer – it helps prevent sapwood splintering when the tree falls. B = Felling cut
Conventional and open-face technique:

• Begin 1 to 2 inches (2,5 to 5 cm) higher than centre of felling notch
• Cut horizontally towards the felling notch
• Leave approx.1/10 of diameter uncut. This is the hinge
• Do not cut through the hinge – you could lose control of the direction of the fall

Drive wedges into the felling cut where necessary to control the fall.
Warning!
If the tip of the bar contacts a wedge, it may cause kickback. Wedges should be of wood or plastic – never steel, which can damage the chain. C = Hinge

• Helps control the falling tree
• Do not cut through the hinge -you could lose control of the direction of the fall

Warning!
In order to reduce the risk of personal injury, never stand directly behind the tree when it is about to fall, since part of the trunk may split and come back towards the operator (barber-chairing), or the tree may jump backwards off the stump. Always keep to the  side of the falling tree. When the tree starts to fall, withdraw the bar, shut off the engine and walk away on the preplanned escape path. Watch out for falling limbs. Warning!
Be extremely careful with partially fallen trees which are poorly supported. When the tree hangs or for some other reason does not fall completely, set the saw aside and pull the tree down with a cable winch, block and tackle or tractor. If you try to cut it down with your saw, you may be injured.
Felling cut for small diameter trees: simple fan cut
Engage the bumper spikes of the chainsaw directly behind the location of the intended hinge and pivot the saw around this point only as far as the hinge. The bumper spike rolls against the trunk. Felling cut for large diameter trees:
Warning!
Felling a tree that has a diameter greater than the length of the guide bar requires use of either the sectioning felling cut or plunge-cut method. These methods are extremely dangerous because they involve the use of the nose of the guide bar and can result in kickback. Only properly trained professionals should attempt these techniques.
Sectioning method
For the sectioning method make the first part of the felling cut with the guide bar fanning in toward the hinge. Then, using the bumper spike as a pivot, reposition the saw for the next cut. Avoid repositioning the saw more than necessary. When repositioning for the next cut, keep the guide bar fully engaged in the kerf to keep the felling cut straight. If the saw begins to pinch, insert a wedge to open the cut. On the last cut, do not cut the hinge.
Plunge-cut method
Timber having a diameter more than twice the length of the guide bar requires the use of the plunge-cut method before making the felling cut. First, cut a large, wide felling notch.
Make a plunge cut in the centre of the notch.
The plunge cut is made with the guide bar nose. Begin the plunge cut by applying the lower portion of the guide bar nose to the tree at an angle. Cut until the depth of the kerf is about the same as the width of the guide bar. Next, align the saw in the direction in which the recess is to be cut.
With the saw at full throttle, insert the guide bar in the trunk.
Enlarge the plunge cut as shown in the illustration.
Warning!
There is an extreme danger of kickback at this point. Extra caution must be taken to maintain control of the saw. To make the felling cut, follow the sectioning method described previously.
If you are inexperienced with a chainsaw, plunge-cutting should not be attempted. Seek the help of a professional.
Limbing
Limbing is removing the branches from a fallen tree.
Warning!
There is an extreme danger of kickback during the limbing operation. Do not work with the nose of the bar. Be extremely cautious and avoid contacting the log or other limbs with the nose of the guide bar.
Do not stand on a log while limbing it – you may slip or the log may roll.
Start limbing by leaving the lower limbs to support the log off the ground. When underbucking freely hanging limbs, a pinch may result or the limb may fall, causing loss of control. If a pinch occurs, stop the engine and remove the saw, by lifting the limb.
Warning!
Be extremely cautious when cutting limbs or logs under tension (spring poles). The limbs or logs could spring back toward the operator and cause loss of control of the saw and severe or fatal injury to the operator. Bucking
Bucking is cutting a log into sections.
Warning!

1. When bucking, do not stand on the log. Make sure the log will not roll downhill. If on a slope, stand on the uphill side of the log. Watch out for rolling logs.

2. Cut only one log at a time.

3. Shattered wood should be cut very carefully. Sharp slivers of wood may be caught and flung in the direction of the operator of the saw.

4. When cutting small logs, place log through “V” – shaped supports on top of a sawhorse. Never permit another person to hold the log.
   Never hold the log with your leg or foot.

5. Logs under strain: Risk of pinching! Always start relieving cut (1) at compression side (A).Then make bucking cut (2) at tension side (B). If the saw pinches, stop the engine and remove it from the log.

6. Only properly trained professionals should work in an area where the logs, limbs and roots are tangled. Working in blow down areas is extremely hazardous.

7. Drag the logs into a clear area before cutting. Pull out exposed and cleared logs first.

MAINTENANCE, REPAIR AND STORING
Maintenance, replacement, or repair of the emission control devices and systems may be performed by any nonroad engine repair establishment or individual. However if you claim warranty for a component which has not been serviced or maintained properly or if nonapproved replacement parts were used, STIHL may deny warranty.
Never operate a chainsaw that is damaged, improperly adjusted or not completely or securely assembled. Follow the maintenance and repair instructions in the appropriate section of your Owner’s Manual, especially those in the chapters “Mounting the Bar and Chain”, “Maintaining and Sharpening” and “Chain Brake”.
Warning!
Use only STIHL replacement parts for maintenance and repair. Use of parts manufactured by others may cause serious or fatal injury.
Warning!
Always stop the engine and ensure that the chain is stopped before making any adjustments, maintenance or repair work, changing the saw chain or cleaning the saw. Do not attempt any maintenance or repair work not described in your Owner’s Manual. Have such work performed at your STIHL service shop only.
Warning!
Never test the ignition system with ignition wire terminal removed from sparkplug or with unseated spark plug, since uncontained sparking may cause a fire.
Warning!
To reduce the risk of fire and burn injury, use only spark plugs authorized by STIHL. Always press spark plug boot snugly onto spark plug terminal of the proper size.
( Note: If terminal has detachable SAE adapter nut, it must be attached.)
A loose connection between spark plug terminal and ignition wire connector in the boot may create arcing that could ignite combustible fumes and cause a fire. Keep spark plug clean, and make sure ignition lead is in good condition.
Warning!
Do not operate your chainsaw if the muffler is damaged, missing or modified.
An improperly maintained muffler will increase the risk of fire and hearing loss. Never touch a hot muffler or burn will result. If your muffler was equipped with a spark-arresting screen to reduce the risk of fire (e. g. in the USA, Canada and Australia), never operate your saw if the screen is missing or damaged.
Remember that the risk of forest fires is greater in hot or dry weather.
Keep the chain, bar and sprocket clean; replace worn sprockets or chains. Keep the chain sharp.
You can spot a dull chain when easy-tocut wood becomes hard to cut and burn marks appear on the wood.
Keep the chain at proper tension.
Tighten all nuts, bolts and screws except the carburetor adjustment screws after each use.
Warning!
In order for the chain brake on your STIHL chainsaw to properly perform its function of reducing the risk of kickback and other injuries, it must be properly maintained. Like an automobile brake, a chainsaw chain brake incurs wear each time it is engaged.
The amount of wear will vary depending upon usage, conditions under which the saw is used and other factors. Excessive wear will reduce the effectiveness of the chain brake and can render it inoperable.
For the proper and effective operation ofthe chain brake the brake band and clutch drum must be kept free of dirt, grease and other foreign matter which may reduce friction of the band on the drum.
For these reasons, each STIHL chainsaw should be returned to trained personnel such as your STIHL servicing dealer for periodic inspection and servicing of the brake system according to the following schedule: Heavy usage – every three months, Moderate usage – twice a year, Occasional usage – annually.
The chainsaw should also be returned immediately for maintenance whenever the brake system cannot be thoroughly cleaned or there is a change in its operating characteristics.
For any maintenance please refer to the maintenance chart and to the warranty statement near the end of this manual.
Additionally, the daily maintenance schedule for your chainsaw set forth in your STIHL Owner’s Manual should be strictly followed.
Store chainsaw in a dry place and away from children. Before storing for longer than a few days, always empty the fuel tank (see chapter “Storing the Machine” in this manual). You can run chains of different pitches on this chainsaw – depending on the chain sprocket (see “Specifications”):
The chain pitch (1) must match the pitch of the sprocket and the guide bar (for Rollomatic). The drive link gauge (2) must match the bar groove width (3).
The pitch is marked on the chain sprocket and guide bar in inches (e.g. 3/8 or .325). The groove width is marked on the guide bar in millimeters (e.g. 1.6).
If non-matching components of the wrong pitch or drive link gauge are run together on the same machine they may be damaged beyond repair after a short period of operation.

• Unscrew the nuts and take off the chain sprocket cover.
• Disengage the chain brake: Pull hand guard (6) toward front handle.
• Turn screw (4) counterclockwise until the tensioner slide (5) butts against left end of housing slot. Wear work gloves to protect your hands from the sharp cutters.
• Fit the chain – start at the bar nose.
• Fit the guide bar over the studs (7) – cutting edges on top of bar must point to right – and engage the peg of the tensioner slide in locating hole (8) – place the chain over sprocket (9) at the same time.
• Now turn tensioning screw (10) clockwise until there is very little chain sag on the underside of the bar –- and the drive link tangs are located in the bar groove.
• Refit the sprocket cover – and screw on the nuts only fingertight.
• Go to “Tensioning the Saw Chain”.

Retensioning during cutting work:
• Shut off the engine first – and then loosen the nut.
• Hold the bar nose up and use screwdriver to turn tensioning screw (1) clockwise until chain fits snugly against the underside of the bar.
• While still holding the bar nose up, tighten down the nut firmly.
• Go to chapter “Checking Chain Tension”.
A new chain has to be retensioned more often than one that has been in use for some time.
• Check chain tension frequently – see chapter “Operating Instructions”.| • Shut off the engine.
• Wear work gloves.
• Chain must fit snugly against the underside of the bar – and, with the chain brake disengaged, it must still be possible to pull the chain along the bar by hand.
• If necessary, retension the chain.
A new chain has to be retensioned more often than one that has been in use for some time.
Check chain tension frequently – see “Operating Instructions”.

Fuel

This engine is certified to operate on unleaded gasoline and the STIHL twostroke engine oil at a mix ratio of 50:1.
Your two-stroke engine requires a mixture of brand-name gasoline and quality two-stroke air cooled engine oil.
Use mid-grade unleaded gasoline with a minimum octane rating of 89 (R+M/2). If the octane rating of the mid-grade gasoline in your area is lower, use premium unleaded fuel.
Fuel with a lower octane rating may increase engine temperatures. This, in turn, increases the risk of piston seizure and damage to the engine.
The chemical composition of the fuel is also important. Some fuel additives not only detrimentally affect elastomers (carburetor diaphragms, oil seals, fuel lines, etc.), but magnesium castings and catalytic converters as well. This could cause running problems or even damage the engine. For this reason STIHL recommends that you use only nationally recognized name brand unleaded gasoline!
Use only STIHL two-stroke engine oil or equivalent branded two-stroke engine oils that are designed for use only in air cooled two-cycle engines.
We recommend STIHL 50:1 two-stroke engine oil since it is specially formulated for use in STlHL engines.
Do not use BIA or TCW rated (twostroke water cooled) mix oils or other mix oils that state they are for use in both water cooled and air cooled engines (e.g., outboard motors, snowmobiles, chain saws, mopeds, etc.).
Take care when handling gasoline. Avoid direct contact with the skin and avoid inhaling fuel vapor. When filling at the pump, first remove the canister from your vehicle and place the canister on the ground before filling. Do not fill fuel canisters that are sitting in or on a vehicle.
The canister should be kept tightly closed in order to avoid any moisture getting into the mixture.
The machine‘s fuel tank and the canister in which fuel mix is stored should be cleaned as necessary.
Fuel mix ages
Only mix sufficient fuel for a few days work, not to exceed 3 months of storage. Store in approved fuel-canisters only. When mixing, pour oil into the canister first, and then add gasoline. Close the canister and shake it vigorously by hand to ensure proper mixing of the oil with the fuel.

Dispose of empty mixing-oil canisters only at authorized disposal locations.
Fueling Before fueling, clean the filler cap and the area around it to ensure that no dirt falls into the tank.
Always thoroughly shake the mixture in the canister before fueling your machine.
Warning!
In order to reduce the risk of burns or other personal injury from escaping gas vapor and fumes, remove the fuel filler cap carefully so as to allow any pressure build-up in the tank to release slowly.

Opening the cap

• Raise the grip until it is upright.
• Turn the cap counterclockwise (approx. a quarter turn).
• Remove the filler cap.

Closing the cap

• Fit the cap – grip upright -marks must line up.
• Turn the cap clockwise as far as stop (approx. a quarter turn).
• Fold the grip flush with the top of the cap.

If the grip does not lie completely flush with the cap and the detent on the grip does not engage the recess in the filler neck, the cap is not properly seated and tightened and you must repeat the above steps. Change the fuel pickup body once every year

• Drain the fuel tank.
• Use a hook to pull the fuel pickup body out of the tank and take it off the hose.
• Push the new pickup body into the hose.
• Place the pickup body in the tank.

Chain Lubricant

For automatic and reliable lubrication of the chain and guide bar – use only an environmentally compatible quality chain and bar lubricant with non-fling additive or the rapidly biodegradable STIHL Bioplus is recommended.
Biological chain oil must be resistant to aging (e.g. STIHL Bioplus) since it will otherwise quickly turn to resin. This results in hard deposits that are difficult to remove, especially in the area of the chain drive, clutch and chain. It may even cause the oil pump to seize.
The service life of the chain and guide bar depends on the quality of the lubricant. It is therefore essential to use only a specially formulated chain lubricant.
If special chain lubricant is not available, you may – in an emergency – use an HD single grade or multigrade engine oil with a viscosity that suits the prevailing outside temperature.
Do not use waste oil!
Medical studies have shown that renewed contact with waste oil can cause skin cancer. Moreover, waste is environmentally harmful!
Waste oil does not have the necessary lubricating properties and is unsuitable for chain lubrication.

Filling Chain Oil Tank

• Thoroughly clean the oil filler cap and the area round it to ensure that no dirt falls into the tank.
• Refill the chain oil tank every time you refuel.

There must still be a small amount of oil in the oil tank when the fuel tank is empty.
If the oil tank is still partly full, the reason may be a problem in the oil supply system: Check chain lubrication, clean the oilways, contact your STlHL dealer for assistance if necessary.

Checking Chain Lubrication

Chain Brake

The saw chain must always throw off a small amount of oil.
Never operate your saw without chain lubrication. If the chain runs dry, the whole cutting attachment will be irretrievably damaged within a very short time.
Always check chain lubrication and oil level in tank before starting work.
Every new chain has to be broken in for about 2 to 3 minutes.
After breaking in chain, check chain tension and adjust if necessary – see “Checking Chain Tension”.| Locking chain with chain brake
– in an emergency
– when starting
– at idling speed
The chain is stopped and locked when when the hand guard is pushed toward the bar nose by the left hand – or when brake is activated by inertia in certain kickback situations.| Releasing the chain brake
• Pull the hand guard back  toward the front handle.
Always disengage chain brake before accelerating engine and before starting cutting work. The only exception to this rule is when you check operation of the chain brake.
High revs with the chain brake engaged (chain locked) will quickly damage the powerhead and chain drive (clutch, chain brake).

The chain brake is designed to be activated also by the inertia of the front hand guard
if the forces are sufficiently high. The hand guard is accelerated toward the bar nose – even if your left hand is not behind the hand guard, e.g. during a felling cut. The chain brake will operate only if it has been properly maintained and the hand guard has not been modified in any way.
Check operation of chain brake
Before starting work:
Run engine at idle speed, engage the chain brake (push hand guard toward bar nose). Accelerate up to full throttle for no more than 3 seconds – the chain must not rotate. The hand guard must be free from dirt and move freely.
Chain brake maintenance
The chain brake is subject to normal wear. It is necessary to have it serviced and maintained regularly by trained personnel, such as your STIHL servicing dealer, at the following intervals:

Winter Operation

At temperatures below +10 °C, preheat carburetor as follows:

• Remove the carburetor box cover.

Inside the carburetor box cover:

• Move the shutter from summer position (1) to winter position (2).

Heated air is now drawn in from around the cylinder and mixed with cold air – this helps prevent carburetror icing.

• At temperatures above +20 °C:
  Return shutter to summer position.
  This is essential to avoid engine running problems and overheating.

Machines with HD filter:

• Install a standard filter in place of the HD-Filter.
• Refit the carburetor box cover and tighten down the twist lock.

At temperatures below -10 °C:
It is advisable to fit the optional cover plate (1128 080 7500) on the fan housing in extremely cold conditions (temperatures below -10 °C, in powder or drifting snow).
The cover plate blanks off the lower slots in the fan housing to help prevent snow being sucked into the machine.
When the cover plate is fitted, the shutter in the carburetor box cover must be in the winter position.

• If your saw is very cold (frost or ice on machine), start the engine and keep it at a high idle speed (with chain brake disengaged) until it reaches normal operating temperature.
• In the event of engine running problems, first check that conditions for use of intake air preheating still apply.

**Electric Handle Heating** Switching on electric handle heating

• Move switch on front handle to I – move switch back to 0 to switch off the heating.

There is no risk of overheating during long periods of operation. The whole heating system is maintenance-free.
Information Before You Start The four positions of the Master Control lever

= Engine off – ignition is switched off.
= Normal run position – engine runs or can fire.
To move the Master Control lever from to or , press down the throttle trigger interlock and squeeze throttle trigger at the same time.
=Warm start – this position is used to start a warm engine. The Master Control lever moves to the normal run position as soon as the throttle trigger is squeezed.
=Cold start – this position is used to start a cold engine.

Starting / Stopping the Engine

Only models with Decompression valve
• Press in the button (arrow) to open the decompression valve.
The valve closes automatically as soon as the engine begins to fire.
• For this reason the decompression valve should be pressed in before each starting attempt.| All models
• Observe safety precautions – see “Safety Precautions”.
• Push hand guard (1) forward:
The chain is now locked.
• Press down trigger interlock (2) and squeeze throttle trigger (3) at the same time.
Set Master Control lever to:
for cold start
for warm start
(even if engine has been running but is still cold)| • Place your saw on the ground.
Make sure you have a firm footing – check that chain is not  touching any object or the ground.
Bystanders must be well clear of the general work area of the saw.
• Hold the saw firmly on the ground with your left hand on the front handle – your thumb should be under the handle.
• Put your right foot into the rear handle and press down.

Alternative method of starting:
• Hold the rear handle tightly between your legs, just above the knees.
• Hold the front handle firmly with your left hand – your thumb should be under the handle.| • Pull the starter grip slowly with your right hand until you feel it engage – and then give it a brisk strong pull and push down the front handle at the same time.
Do not pull out starter rope to its full lenght – it might otherwise break.
Do not let the starter grip snap back – guide it slowly and vertically into the housing so that the starter rope can rewind properly.
If engine is new, pull starter grip severaltimes to prime the fuel line.| When engine begins to fire:
• Press in decompression valve.
• Move Master Control lever (4) to n and continue cranking – as soon as engine runs, immediately blip the throttle trigger (5) – the Master Control lever (4) will
move to the “Run” position # (6) and the engine will settle down to idling speed.
As the chain brake is still engaged, the engine must be returned to idling speed immediately – or the engine and chain brake might otherwise be damaged.

• Pull the hand guard back toward the front handle:=  The chain brake is now disengaged – your saw is ready for operation.
  Always disengage chain brake before accelerating engine. High revs with the chain brake engaged (chain locked) will quickly damage the powerhead and chain drive (clutch, chain brake).

• Observe safety precautions.

• Always check operation of chain lubrication before starting work.

At very low outside temperatures:

• Allow engine to warm up at part throttle.
• Change over to winter operation if necessary – see “Winter Operation”.

To shut down the engine:

• Move Master Control lever to

If fuel tank has been run until dry and then refueled:

• Press in decompression valve.
• Pull starter rope several times until fuel line is primed.
• Now start the engine.

If the engine doesn’t start:
If you did not move the Master Control lever to “Warm Start” n quickly enough after the engine began to fire, the combustion chamber has flooded.

• Open the twist lock and remove the carburetor box cover.
• Take out the baffle plate (1) upwards.
• Pull off the spark plug boot (2).

Operating Instructions

• Unscrew and dry off the spark plug.
• Set the Master Control lever to “Stop” position
• Press down the interlock lever, open the throttle wide and, at the same time, crank the engine several times with the starter to clear the combustion chamber.
• Refit the spark plug and connect the spark plug boot – reassemble the other parts.
• Set Master Control lever to “Warm Start” – even if engine is cold.
• Now start the engine.

During break-in period
A factory new machine should not be run at high revs (full throttle off load) for the first three tank fillings. This avoids unnecessary high loads during the break-in period. As all moving parts have to bed in during the break-in period, the frictional resistances in the engine are greater during this period. The engine develops its maximum power after about 5 to 15 tank fillings.
Do not make the mixture leaner to achieve an apparent increase in power – this could damage the engine – see “Adjusting Carburetor”.
Always disengage the chain brake before opening the throttle. Running the engine at higher revs with the chain brake engaged (saw chain at a standstill) will quickly damage the engine and chain drive (clutch, chain brake).

During operation

Check chain tension frequently
A new chain has to be retensioned more often than one that has been in use for some time.
Chain cold:
Tension is correct when chain fits snugly against the underside of the bar and can still be pulled along the bar by hand.
Retension if necessary – see “Tensioning the Saw Chain”.
Chain at operating temperature:
The chain stretches and begins to sag.
The drive links must not come out of the bar groove – the chain may otherwise jump off the bar.
Retension the chain – see “Tensioning the Saw Chain”!
Always slacken off the chain after finishing work. The chain contracts as it cools down. If it is not slackened off, it can damage the crankshaft and bearings.

Oil Quantity Control

Taking Care of Guide Bar

After long period of full-throttle operation
Allow engine to run for a short while at idle speed so that engine heat can be dissipated by flow of cooling air. This protects engine-mounted components (ignition, carburetor) from thermal overload.
After finishing work

• Slacken off the chain if you have retensioned it at operating temperature during cutting work.

The chain contracts as it cools down. If it is not slackened off, it could damage the crankshaft and bearings.
Storing your saw for a short period:
Wait for engine to cool down. To avoid condensation, fill the fuel tank and keep the machine in a dry place, well away from sources of ignition, until you need it again.
Storing for a long period: See “Storing the Machine”! Different quantities of oil are required for different bar lengths, types of wood and cutting techniques.

• Use the adjusting screw (1) (on underside of machine) to vary the oil feed rate as required.
• For average oil feed rate, turn adjusting screw to “E“ (Ematic position).
• To increase oil feed – turn adjusting screw clockwise.
• To reduce oil feed – turn adjusting screw counter-clockwise.

Your chain must always be wetted with a film of lubricant.

• Turn the bar over –
  every time you sharpen the chain and every time you replace the chain – this helps avoid one-sided wear, especially at the nose and underside of the bar.

• Regularly clean the oil inlet hole (1), the oilway (2) and the bar groove (3).

• Measure groove depth – with scale on filing gauge* – in area used most for cutting.

Air Filter System

If groove depth is less than specified:

• Replace the guide bar.
  The drive link tangs will otherwise scrape along the bottom of the groove – the cutters and tie straps will not ride on the bar rails.

|
---|---
The air filter system can be adapted to suit different operating conditions by simply installing a choice of filters.
Standard filter (1) (green) with wire mesh for normal operating conditions and winter operation.
HD filter (2) (black) for dry and ver dust work areas.| Other filters are used in some models:
Fabric filter (3) for normal operating conditions and winter operation or the fleece filter (non woven element) (4) for dry and ver dust work areas.
STIHL filters have a long service life when kept in a dry condition.
• Always use STIHL filters in dry condition.

Removing the Air Filter

• Open the twist lock above the rearhandle and remove the carburetor box cover.

HD Filter

• Pull off the filter.

Box Filter

• Set the Master Control lever to
• Pull off the outer half (1) of the filter.

After cleaning the outer half of the filter several times:

• Unscrew the slotted nuts (2) and remove the baffle (3).
• Remove the inner half (4) of the filter.

Cleaning the Air Filter Cleaning HD Filter

Dirty air filters reduce engine power, increase fuel consumption and make starting more difficult.
If there is a noticeable loss of engine power:

• Knock out the standard filter (1) or fleece filter (2) (outer half of filter) or fabric filter (3) (outer half of filter) and inner half of filter (4) on the palm of your hand or blow out with compressed air.

In case of stubborn dirt or sticky filter fabric:

• Wash the filter in a clean, nonflammable solution (e.g. warm soapy water) and then dry. Do not expose to high temperatures.
• Do not impregnate filter with oil.
• Always replace a damaged filter.
• Reinstall the air filter.

If there is a noticeable loss of engine power:
• Clean the felt prefilter (1).
After cleaning the prefilter several times:
• Separate the filter components.
• Knock the HD filter (2) out on the palm of your hand and blow it out with compressed air from the inside outward.| In case of stubborn dirt or sticky filter fabric:
• Wash filter with STIHL universal cleaner or in a fresh, non-flammable solution (e.g. warm soapy water).
• Rinse the filter, from the inside outward, under a low-pressure water jet – do not use a highpressure washer.
• Dry all parts of the filter. Do not expose to high temperatures.

• Fit the felt prefilter (1) over the HD filter (2) – note correct installed position (see ilustration).
• Install HD filter (with felt prefilter) and carburetor box cover.
• Check carburetor setting and readjust if necessary.

The felt prefilter helps protect the HD filter and thus extends its useful life.
For this reason the felt prefilter should be replaced at more frequent intervals than the HD filter.
Always replace a damaged filter.

Motor Management

Exhaust emissions are controlled by the design of the fundamental engine parameters and components (e.g. carburation, ignition, timing and valve or port timing) without the addition of any major hardware.
Adjusting the Carburetor

General information
The carburetor comes from the factory with a standard setting
This setting provides an optimum fuel-air mixture under most operating conditions.
With this carburetor it is only possible to adjust the engine idle speed within fine limits.
Standard setting

• Shut off the engine.
• Turn the high speed adjusting screw (H) counterclockwise up to the stop, i.e. ¾ turn from max. lean setting.
• Turn the low speed adjusting screw (L) one quarter of a turn counterclockwise from max. lean setting.

Adjustment for operation at high altitude or at sea level
A slight correction of the setting may be necessary if engine power is not satisfactory when operating at high altitude or at sea level:

• Check the air filter and clean it if necessary.
• Warm up the engine.

At high altitude

• Rotate the high speed adjusting screw (H) clockwise (leaner) – no further than stop.

At sea level

• Rotate the high speed adjusting screw (H) counterclockwise (richer) no further than stop.

Adjusting idle speed

Engine stops while idling

• Open the low speed screw (L) counterclockwise one quarter of a turn from max. lean setting.
• Turn the idle speed adjusting screw (LA) clockwise until chain begins to run – then back off the screw one quarter of a turn.

Chain runs when engine is idling

• Open the low speed screw (L) counterclockwise one quarter of a turn from max. lean setting.
• Turn the idle speed adjusting screw (LA) counterclockwise until chain stops running – then turn screw another quarter turn in the same direction.

Erratic idling behavior, poor acceleration
(even though you have opened low speed screw one quarter of a turn)
Idle setting is too lean.

• Turn the low speed adjusting screw (L) counterclockwise until engine runs and accelerates smoothly.

It is usually necessary to change the setting of the idle speed adjusting screw (LA) after every correction to the low speed adjusting screw (L).

Spark Arresting Screen in Muffler If the engine is down on power, check the spark arresting screen in the muffler:

• Allow muffler to cool down.
• Take out the four screws.
• Remove the muffler upper casing (4).
• Bend back the retaining tabs (5).
• Remove the spark arresting screen (6).
• Clean spark arresting screen. If screen is damaged or heavily carbonized, fit a new one.
• Refit the spark arresting screen in the reverse sequence.

Checking the Spark Plug Wrong fuel mix (too much engine oil in the gasoline), a dirty air filter and unfavorable running conditions (mostly at part throttle etc.) affect the condition of the spark plug. These factors cause deposits to form on the insulator nose which may result in trouble in operation.
If engine is down on power, difficult to start or runs poorly at idling speed, first check the spark plug.

• Remove spark plug – see “Starting / Stopping the Engine“.
• Clean dirty spark plug.
• Check electrode gap (A) and readjust if necessary – see “Specifications”.
• Use only resistor type spark plugs of the approved range.

Rectify problems which have caused fouling of spark plug:

• Too much oil in fuel mix.
• Dirty air filter.
• Unfavorable running conditions, e.g. operating at part load.

Fit a new spark plug after approx. 100 operating hours
or earlier if the electrodes are badly eroded.

Replacing Starter Rope and Rewind Spring

| |
---|---|---
To reduce the risk of fire and burn injury, use only spark plugs authorized by STIHL. Always press spark plug boot (2) snugly onto spark plug terminal (1) of the proper size. (Note: If boot has detachable SAE adapter nut, it must be attached.)
A loose connection between spark plug boot and ignition wire connector in the boot may create arcing that could ignite combustible
fumes and cause a fire.| • Remove the screws (1).
• Push the hand guard up.
• Pull underside of fan housing away from crankcase and remove it downward.
• Use screwdriver or suitable pliers to carefully remove spring clip (2) from the starter post.
• Carefully remove the rope rotor with washer (3) and pawls (4). Take care not to pull the rewind spring (behind the rotor) out of the housing during this process.| • Use a screwdriver to pry the rope out of the starter grip.
• Remove remaining rope from the rotor and grip.
Thread the new rope through the top of the grip and the rope bush (5).
• Thread the rope through the rotor and secure it with a simple overhand knot.
• Coat rope rotor bearing bore with non-resinous oil.
• Slip rotor over starter post – turn it back and forth to engage anchor loop of rewind spring.

• Refit the pawls (4) in the rotor.
• Fit the washer (3) on the starter post.
• Use screwdriver or suitable pliers toinstall spring clip (2) on starter post and engage it on the pawls – the spring clip must point clockwise – see illustration.

Tensioning rewind spring

• Make a loop in the unwound starter rope and use it to turn the rope rotor six full revolutions in the direction of the arrow.
• Hold the rotor steady – pull out and straighten the twisted rope.
• Release the rope rotor
• let go of rope slowly so that it winds onto the rotor.

The starter grip must locate firmly in therope guide bush. If the grip droops to one side: Add one more turn on rope rotor to increase spring tension.
When starter rope is fully extended it must still be possible to rotate the rotor at least another half turn. If this is not the case, the spring is overtensioned and could break. Take one turn of rope off the rotor.

• Fit the fan housing on the crankcase.
• Set the Master Control lever to
• Push the remaining rope into the starter grip so that the nipple (6) is flush with the grip.

Replacing a broken rewind spring

• Remove the rope rotor.
  **** The bits of spring in the fan housing might still be under tension and could fly apart when you take them out of the housing. To reduce risk of injury, wear eye and face protection and work gloves.

• Use a screwdriver to carefully pry the parts of the spring out of the housing.

• Lubricate the new spring with a few drops of non-resinous oil.

• Place the new spring with retaining frame in position in the fan housing – the anchor loop must engage the lug.

• Apply suitable tools (screwdriver, punch, etc.) to the recesses (arrows) and push the spring into its seat – it slips out of the retaining frame in this process.

• Reinstall the rope rotor, tension the rewind spring, fit the fan housing and secure in position.

Storing the Machine

For periods of about 3 months or longer:

• Drain and clean the fuel tank in a well ventilated area. : Run engine until carburetor is dry, this helps prevent the carburetor diaphragms sticking together.
• Remove the saw chain and guide bar, clean them and spray with corrosion inhibiting oil.
• Thoroughly clean the machine, pay special attention to the cylinder fins and air filter.
• If you use a biological chain and bar lubricant, e.g. STIHL BioPlus, completely fill the chain oil tank.
• Store the machine in a dry and high or locked location, out of the reach of children and other unauthorized persons.

Checking and Replacing Chain Sprocket

• Remove the chain sprocket cover, chain and guide bar.
• Disengage the chain brake:
  Pull hand guard toward the front handle.
  – Replace the chain sprocket after using two Oilomatic chains. – Replace sooner if the wear marks on the sprocket are deeper than approx. 0.02 in (0,5 mm) since this would reduce the life of the chain. You can use a gauge (see “Special Accessories”) to check the depth of the wear marks on sprockets.

It is best to use two chains in rotation with one sprocket.
Use only original STIHL chain sprockets to ensure correct operation of the chain brake.

• Use a screwdriver to remove the E-clip (1).
• Take off the washer (2) and rim sprocket (3).
• Examine splines (arrow) on clutch drum (4) – if wear marks are severe, fit a new clutch drum.
• Pull clutch drum or spur sprocket (5) and needle cage (6) off the crankshaft.

Installing spur sprocket / rim sprocket

• Clean the crankshaft stub and needle cage, and lubricate with STlHL grease (see “Special Accessories”).
• After fitting clutch drum or spur sprocket, rotate it about one turn to engage oil pump drive.
• Fit rim sprocket with cavities facing outward.
• Refit washer and E-clip on the crankshaft.

Maintaining and Sharpening Saw Chain

Correctly sharpened chain
A properly sharpened chain slices through wood effortlessly and requires very little feed pressure.
Do not work with a dull or damaged chain as it will increase the physical effort required, produce unsatisfactory results and a higher rate of wear.

• Clean the chain.
• Check the chain for cracks in the links and damaged rivets.
• Replace any damaged or worn parts of the chain and match the new parts to the shape and size of the original parts.

It is absolutely essential to comply with the angles and dimensions specified below. If the saw chain is incorrectly sharpened – and in particular if the depth gauge is set too low – there is a risk of increased kickback of the chainsaw, with resulting risk of injury. The chain pitch (e.g. 3/8″) is marked on the depth gauge end of each cutter.
Use only special saw chain sharpening files. Other files have the wrong shape and cut.
Select file diameter according to chain pitch – see table “Sharpening Tools”.
You must observe certain angles when resharpening the chain cutter. A = Filing angle
B = Side plate angle

Cutter shapes:
Micro = Semi-chisel
Super = Full chisel
The specified angles A and B are obtained automatically if the recommended files or sharpening tools and correct settings are used.
Furthermore, the angles must be the same on all cutters. If angles are uneven: Chain will run roughly, not in a straight line, wear quickly and finally break.

As these requirements can be met only after sufficient and constant practice:

• Use a file holder*

A file holder must be used for manual resharpening (see table “Sharpening Tools”). The correct filing angles are marked on the file holder. For checking angles
Use a STlHL filing gauge* (see table “Sharpening Tools”). This is a universal tool for checking the filing and side plate angles, depth gauge setting and cutter length. It also cleans the guide bar groove and oil inlet holes.
File correctly

• Select sharpening tools according to chain pitch.
• Clamp the bar in a vise if necessary.
• Lock the chain – push hand guard forward.
• To rotate the chain – pull hand guard against handle.
• Sharpen chain frequently, take away as little metal as possible – two or three strokes of the file are usually enough.
• Hold the file horizontally (at right angle to side of guide bar) and file according to the angles marked on the file holder. Rest the file holder on the top plate nd depth gauge.
• Always file from the inside to the outside of the cutter.
• The file only sharpens on the forward stroke – lift the file off the cutter on the backstroke.
• Avoid touching the tie straps and drive links with the file.
• Rotate the file at regular intervals while filing to avoid one-sided wear.
• Use a piece of hardwood to remove burrs from cutting edge.
• Check angles with the filing gauge.

All cutters must be the same length.
If the cutters are not the same length, they will have different heights. This makes the chain run roughly and can cause it to break.

• Find the shortest cutter and then file all other cutters back to the same length. This can be very time consuming – it is best to have it done in the workshop on an electric grinder.

Depth gauge setting
The depth gauge determines the height at which the cutter enters the wood and thus the thickness of the chip removed.
Specificed distance or setting between depth gauge and cutting edge = a:
This setting may be increased by 0.2mm (0.008″) for cutting softwood in mild weather season – no frost.

Lowering depth gauges
The depth gauge setting is reduced when the chain is sharpened.

• Use a filing gauge to check the setting every time you sharpen the chain.
• Place a filing gauge (1) that matches the chain pitch on the chain – if the depth gauge projects from the filing gauge, the depth gauge has to be lowered.
• File down the depth gauge until it is level with the filing gauge.

• File the top of the depth gauge parallel to the stamped service marking (see arrow) –
but do not lower the highest point of the depth gauge in this process.
**** The kickback tendency of the chainsaw is increased if the depth gauges are too low.| • Place filing gauge on the chain – highest point of depth gauge must be level with the filing gauge.

**** On PM1 and RM2 chains the rear hump of the tie strap (with service marking) is lowered along with the depth gauge. The other parts of the triple- humped tie strap must not be filed since this may increase the kickback tendency of the chainsaw.

• After sharpening, clean the chain thoroughly, remove filings or grinding dust – lubricate the chain thoroughly.
• Before long out-of-service period, clean the chain and store it in a well-oiled condition.

Sharpening Tools (special accessories)

Chain pitch| Round file Ø| Round file| File holder| Filing gauge| Flat file¹)| Sharpening kit²)
---|---|---|---|---|---|---
inch| (mm)| mm| (inch)| Part No.| Part No.| Part No.| Part No.| Part No.
1/4
3/8 PMN
3/8 P
0.325
3/8
0.404| (6.35)
(9.32)
(9.32)
(8.25)
(9.32)
(10.26)| 4.0
4.0
4.0
4.8
5.2
5.5| (5/32)
(5/32)
(5/32)
(3/16)
(13/64)
(7/32)| 5605 772 4006
5605 772 4006
5605 772 4006
5605 772 4806
5605 772 5206
5605 772 5506| 5605 750 4327
5605 750 4327
5605 750 4327
5605 750 4328
5605 750 4329
5605 750 4330| 1110 893 4000
0000 893 4000
1110 893 4000
1110 893 4000
1110 893 4000
1106 893 4000| 0814 252 3356
0814 252 3356
0814 252 3356
0814 252 3356
0814 252 3356
0814 252 3356| 5605 007 1027
5605 007 1026
5605 007 1027
5605 007 1028
5605 007 1029
5605 007 1030

1. Use triangular file 0811 421 8971 for PM1 and RM2
2. consisting of file holder with round file, flat file and filing gauge

Maintenance Chart

Please note that the following maintenance intervals apply for normal operating conditions only. If your daily working time is longer than normal or cutting conditions are difficult (very dusty work area, resin-rich wood, tropical wood etc.), shorten the specified intervals accordingly. If you only use the saw occasionally, extend the intervals accordingly.

| before starting work| after finishing work or daily| after each refueling stop| weekly| monthly| every 12 months| if problem| if damaged| as required
---|---|---|---|---|---|---|---|---|---
Complete machine| Visual inspection (condition, leaks)| X| | X| | | | | |
Clean| | X| | | | | | |
Throttle trigger, trigger interlock, Master Control| Check operation| X| | X| | | | | |
Chain brake| Check operation| X| | X| | | | | |
Check 1)2)| | | | | | | | | X
Pickup body/filter in fuel tank| Check| | | | | X| | | |
Clean, replace filter element| | | | | X| | X| |
Replace pickup body| | | | | | X| | X| X
Fuel tank| Clean| | | | | X| | | |
Chain oil tank| Clean| | | | | X| | | |
Chain lubrication| Check| X| | | | | | | |
Saw chain| Inspect, also check sharpness| X| | X| | | | | |
Check chain tension| X| | X| | | | | |
Sharpen| | | | | | | | | X
Guide bar| Check (wear, damage)| X| | | | | | | |
Clean and turn over| | | | | | | | | X
Deburr| | | | X| | | | |
Replace| | | | | | | | X| X
Chain sprocket| Check| | | | X| | | | |
Air filter| Clean| | | | | | | X| | X
Replace| | | | | | | | X|
AV elements (rubber buffers, springs)| Inspect| | | | | | | X| | X
Replace 1)| | | | | | | | X|
Cooling inlets| Clean| | X| | | | | | |
Cylinder fins| Clean| | X| | | X| | | |
Carburetor| Check idle adjustment – chain must not rotate| X| | X| | | | | |
Readjust idle| | | | | | | | | X
Spark plug| Readjust electrode gap| | | | | | | X| |
All accessible screws and nuts (not adjusting screws) 2)| Retighten| | | | | | | | | X
Spark arresting screen* in muffler| Inspect| | | | | | | X| |
Clean or replace| | | | | | | | X|
Chain catcher| Check| X| | | | | | | |
Replace| | | | | | | | X|

1. STIHL dealer
2. see “Chain brake” Firmly tighten cylinder base screws of professional saws (3.4 kW or more) after 10 to 20 hours of operation

Parts and Controls

1 Carburetor box cover twist lock
2 Spark plug boot
3 Handle heating switch*
4 Chain sprocket cover
5 Chain sprocket
6 Chain brake
7 Chain catcher
8 Chain tensioner
9 Bumper spike
10 Guide bar
11 Oilomatic saw chain| 12 Oil filler cap
13 Muffler
14 Front hand guard
15 Front handle (handlebar)
16 Decompression valve
17 Starter grip
18 Fuel filler cap
19 Master Control lever
20 Throttle trigger
21 Throttle trigger interlock
22 Rear handle
23 Rear hand guard
---|---

Definitions

1. Carburetor Box Cover Twist Lock.
   Lock for carburetor box cover.

2. Spark Plug Boot.
   Connects the spark plug with the ignition wire.

3. Handle Heating Switch.
   For switching the electric handle heating on and off.

4. Chain Sprocket Cover.
   Covers the clutch and the sprocket.

5. Chain Sprocket.
   The toothed wheel that drives the saw chain.

6. Chain Brake.
   A device to stop the rotation of the chain if activated in a kickback situation by the operator’s hand or by inertia.

7. Chain Catcher.
   Helps to reduce the risk of operator contact by a chain when it breaks or comes off the bar.

8. Chain Tensioner.
   Permits precise adjustment of chain tension.

9. Bumper Spike.
   Toothed stop for holding saw steady against wood.

10. Guide Bar.
    Supports and guides the saw chain.

11. Oilomatic Saw Chain.
    A loop consisting of cutters, tie straps and drive links.

12. Oil Filler Cap.
    For closing the oil tank.

13. Muffler.
    Reduces engine exhaust noise and directs the exhaust gases.

14. Front Hand Guard.
    Provides protection against projecting branches and helps prevent left hand from touching the chain if it slips off the handlebar.

15. Front Handle.
    Handle bar for the left hand at front of saw.

16. Decompression Valve.
    Makes starting easier.

17. Starter Grip.
    The grip of the starter, for starting the engine.

18. Fuel Filler Cap.
    For closing the fuel tank.

19. Master Control Lever.
    Lever for choke control, starting throttle, run and stop switch positions.

20. Throttle Trigger.
    Controls the speed of the engine.

21. Throttle Trigger Interlock.
    Must be depressed before the throttle trigger can be activated.

22. Rear Handle.
    The support handle for the right hand, located at or toward the rear of the saw.

23. Rear Hand Guard.
    Gives added protection to operator’s right hand.

Guide Bar Nose.
The exposed end of the guide bar.
(not illustrated, see chapter “Tensioning the Saw Chain”.
Clutch.
Couples engine to chain sprocket when engine is accelerated beyond idle speed. (not illustrated).
Anti-Vibration System.
The anti-vibration system includes a number of buffers designed to reduce the transmission of vibrations created by the engine and cutting attachment to the operator’s hands. (not illustrated).

Specifications

Engine
EPA:
The Emission Compliance Period referred to on the Emissions Compliance Label indicates the number of operating hours for which the engine has been shown to meet Federal emission requirements.
Category A = 300 hours, B = 125 hours, C = 50 hours
STIHL single cylinder two-stroke engine

Ignition System

Fuel/Oil System
Carburetor: All position diaphragm carburetor with integral fuel pump
Air filter: Synthetic fabric
Fuel tank capacity: 1.69 US pt (0.8 l )
Fuel mix: See “Fuel”
Chain lubrication: Fully automatic oil pump
Oil tank capacity: 0.68 US pt (0.325 l)
Weight
without bar and chain: 13 lb (5.9 kg)
Cutting Attachment
Recommended cutting attachments for compliance with § 5.11 of ANSI Standard B 175.1-2000 (see page 14 of this Manual):
STIHL reduced kickback bar (with green label) for 3/8″ pitch:
Rollomatic with sprocket nose 16, 18 or 20 in (40, 45 or 50 cm)
STIHL low kickback chain¹)
(with green label) for 3/8″ pitch: 3/8″ (9.32 mm) Rapid-Micro 2 (33 RM2, 36 RM2)
Chain sprocket: 7-tooth for 3/8″ pitch spur sprocket
In order to comply with the kickback performance requirements of § 5.11 of ANSI Standard B 175.1-2000, do not use replacement saw chain unless it has been designated as meeting the ANSI § 5.11 requirements on this specific powerhead, or has been designated as “low kickback” saw chain¹) in accordance with the ANSI B 175.1-2000 standard.
¹) See definition of “low kickback chain” on page 16 of this Manual.
Since new bar/chain combinations may be developed after publication of this Manual, ask your STIHL dealer for the latest STIHL recommendations.
Other bars and chains available for this powerhead are:
STIHL yellow-labeled bars: for 3/8″ pitch:
Rollomatic “S” with sprocket nose 16, 18, 20, 24, 28, 30, 32 or 36 in (40, 45, 50, 63, 70, 75, 80 or 90 cm) Duromatic with stellite tipped nose 16, 18, 20 or 24 in (40, 45, 50 or 63 cm) STIHL yellow -labeled chains:
for 3/8″ pitch:
Rapid-Micro (33 RM, 36 RM, 33 RMF), Rapid-Super (33 RS, 33 RS, 36 RS, 36 RS, 33 RSLK, 36 RSLK, 33 RSFK, 33 RSLFK, 36 RSLFK, 36 RSLHK). Chain sprocket: 8-tooth 3/8″ rim sprocket

Special Accessories

File holder with round file
Filing gauge
Reference gauges
STIHL lubricating grease
STIHL filler nozzle
for STIHL canisters, helps avoid spills and overfilling during refueling.
Contact your STIHL dealer for more information on these and other special accessories.

Ordering Spare Parts

Please enter your saw model, serial number as well as the part numbers of the guide bar and saw chain in the spaces provided. This will make re-ordering simpler.
The guide bar and saw chain are subject to normal wear and tear.
When purchasing these parts, always quote the saw model, the part numbers and names of the parts.
Model

Serial number

Guide bar part number

Chain part number

For recommended STIHL reduced kickback cutting attachments see section “Specifications“ of this Owner’s Manual.

Maintenance and Repairs

The user of this unit should carry out only the maintenance operations described in this manual. Other repair work may be performed only by an authorized STIHL dealer.
Warranty claims following repairs can be accepted only if the repair has been performed by an authorized STIHL dealer using original STIHL replacement parts.
Original STlHL parts can be identified by the STIHL part number, the logo and the STlHL parts symbol .
The symbol may appear alone on small parts.

STIHL Incorporated Federal Emission Control Warranty Statement

Your Warranty Rights and Obligations
The U.S. Environmental Protection Agency (EPA) and STIHL Incorporated are pleased to explain the Emission Control System Warranty on your equipment type engine. In the U.S. new 1997 and later model year small off-road equipment engines must be designed, built and equipped, at the time of sale, to meet the U.S. EPA regulations for small non road engines. The equipment engine must be free from defects in materials and workmanship which cause it to fail to conform with U.S. EPA standards for the first two years of engine use from the date of sale to the ultimate purchaser.
STIHL Incorporated must warrant the emission control system on your small off- road engine for the period of time listed below provided there has been no abuse, neglect or improper maintenance of your small off-road equipment engine.
Your emission control system includes parts such as the carburetor and the ignition system. Also included may be hoses, and connectors and other emission related assemblies.
Where a warrantable condition exists, STIHL Incorporated will repair your small off-road equipment engine at no cost to you, including diagnosis (if the diagnostic work is performed at an authorized dealer), parts, and labor.

Manufacturer’s Warranty Coverage:

In the U.S., 1997 and later model year small off-road equipment engines are warranted for two years. If any emissionrelated part on your engine is defective, the part will be repaired or replaced by STIHL Incorporated free of charge.

Owner’s Warranty Responsibilities:

As the small off-road equipment engine owner, you are responsible for the performance of the required maintenance listed in your owner’s manual. STIHL Incorporated recommends that you retain all receipts covering maintenance on your small off-road equipment engine, but STIHL Incorporated cannot deny warranty solely for the lack of receipts or for your failure to ensure the performance of all scheduled maintenance.
Any replacement part or service that is equivalent in performance and durabilitymay be used in non-warranty maintenance or repairs, and shall not reduce the warranty obligations of the engine manufacturer.
As the small off-road equipment engine owner, you should be aware, however, that STIHL Incorporated may deny you warranty coverage if your small off-road equipment engine or a part has failed due to abuse, neglect, improper maintenance or unapproved modifications.
You are responsible for presenting your small off-road equipment engine to a STIHL service center as soon as a problem exists. The warranty repairs will be completed in a reasonable amount of time, not to exceed 30 days.
If you have any questions regarding your warranty rights and responsibilities, please contact a STIHL customer service representative at 1-800-4678445 or you can write to
STIHL Inc.,
536 Viking Drive, P.O. Box 2015,
Virginia Beach, VA 23450-2015.
Coverage by STIHL Incorporated
STIHL Incorporated warrants to the ultimate purchaser and each subsequent purchaser that your small off-road equipment engine will be designed, built and equipped, at the time of sale, to meet all applicable regulations. STIHL Incorporated also warrants to the initial purchaser and each subsequent purchaser that your engine is free from defects in materials and workmanship which cause the engine to fail to conform with applicable regulations for a period of two years.
Warranty Period
The warranty period will begin on the date the utility equipment engine is purchased by the initial purchaser and you have signed and sent back the warranty card to STIHL.
If any emission related part on your engine is defective, the part will be replaced by STIHL Incorporated at no cost to the owner. Any warranted part which is not scheduled for replacement as required maintenance, or which is scheduled only for regular inspection to the effect of “repair or replace as necessary” will be warranted for the warranty period. Any warranted part which is scheduled for replacement as required maintenance will be warranted for the period of time up to the first scheduled replacement point for that part.
Diagnosis
You, as the owner, shall not be charged for diagnostic labor which leads to the determination that a warranted part is defective. However, if you claim warranty for a component and the machine is tested as non-defective, STIHL Incorporated will charge you for the cost of the emission test. Mechanical diagnostic work will be performed at an authorized STIHL servicing dealer. Emission test may be performed either at STIHL Incorporated or at any independent test laboratory.
Warranty Work
STIHL Incorporated shall remedy warranty defects at any authorized STIHL servicing dealer or warranty station. Any such work shall be free of charge to the owner if it is determined that a warranted part is defective.
Any manufacturer-approved or equivalent replacement part may be used for any warranty maintenance or repairs on emission-related parts and must be provided without charge to the owner. STIHL Incorporated is liable for damages to other engine components caused by the failure of a warranted part still under warranty.
The following list specifically defines the emission-related warranted parts:
Carburetor
Choke (Cold start enrichment system)
Intake manifold
Air filter
Spark plug
Magneto or electronic ignition system (ignition module)
Catalytic converter (if applicable)
Fasteners
Where to make a claim for Warranty Service
Bring the product to any authorized
STIHL servicing dealer and present the signed warranty card.
Maintenance Requirements
The maintenance instructions in this manual are based on the application of the recommended 2-stroke fuel-oil mixture (see also instruction “Fuel”). Deviations from this recommendation regarding quality and mixing ratio of fuel and oil may require shorter maintenance intervals.
Limitations
This Emission Control Systems Warranty shall not cover any of the following:

• repair or replacement required because of misuse, neglect or lack of required maintenance,
• repairs improperly performed or replacements not conforming to STIHL Incorporated specifications that adversely affect performance and/or durability, and alterations or modifications not recommended or approved in writing by STIHL Incorporated, and
• replacement of parts and other services and adjustments necessary for required maintenance at and after the first scheduled replacement point.

WARNING!
The engine exhaust from this product contains chemicals known to the State of California to cause cancer, birth defects or other reproductive harm.

0458 175 8621

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