makita DUC Series Cordless Chain Saw Instruction Manual

DUC Series Cordless Chain Saw
Instruction Manual

Read before use.

SPECIFICATIONS

91PX
Sprocket| Number of teeth| 6
Pitch| 3/8″
Chain speed| 0 – 7.7 m/s
(0 – 460 m/min)
Chain oil tank volume| 150 cm3

• Due to our continuing program of research and development, the specifications herein are subject to change without notice.
• Specifications may differ from country to country.
1: Weight, without the saw chain, guide bar, guide bar cover, oil, and battery cartridge(s).
2: The lightest and heaviest combination of weight, according to EPTA-Procedure 01/2014. The weight may differ depending on the attachment(s), including the battery cartridge(s).
Saw chain, guide bar, and sprocket combination

WARNING: Use the appropriate combination of the guide bar and saw chain. Otherwise, personal injury may result.

Applicable battery cartridge and charger

• Some of the battery cartridges and chargers listed above may not be available depending on your region of residence.
WARNING: Only use the battery cartridges and chargers listed above. Use of any other battery cartridges and chargers may cause injury and/or fire.
Recommended cord-connected power source

• The cord-connected power source(s) listed above may not be available depending on your region of residence.
• Before using the cord-connected power source, read the instructions and cautionary markings on them.

Symbols

The followings show the symbols which may be used for the equipment. Be sure that you understand their meaning before use.

| Read the instruction manual.
---|---
| Wear safety glasses.
| Wear ear protection.
| Maximum permissible cut length
| Always use two hands when operating the chainsaw.
| Beware of chain saw kickback and avoid contact with bar tip.
| Do not expose to moisture.
| The direction of chain travel
| Saw chain oil adjustment
Ni-MH
Li-ion| Only EU countries
Due to the presence of hazardous components in the equipment, waste electrical and electronic equipment, accumulators and batteries may have a negative impact on the environment and human health. Do not dispose of electrical and electronic appliances or batteries with household waste! In accordance with the European Directive on waste electrical and electronic equipment and on accumulators and batteries and waste accumulators and batteries, as well as their adaptation to national law, waste electrical equipment, batteries, and accumulators should be stored separately and delivered to a separate collection point for municipal waste, operating in accordance with the regulations on environmental protection. This is indicated by the symbol of the crossed-out wheeled bin placed on the equipment.
| Guaranteed sound power level according to EU Outdoor Noise Directive.
| Sound power level according to Australia NSW Noise Control Regulation.

Intended use
This chain saw is intended for sawing wood.

SAFETY WARNINGS

General power tool safety warnings
WARNING: Read all safety warnings, instructions, illustrations, and specifications provided with this power tool. Failure to follow all instructions listed below may result in electric shock, fire, and/or serious injury.
Save all warnings and instructions for future reference.
The term “power tool” in the warnings refers to your mains-operated (corded) power tool or battery-operated (cordless) power tool.
Work area safety

1. Keep the work area clean and well-lit. Cluttered or dark areas invite accidents.
2. Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases, or dust. Power tools create sparks that may ignite dust or fumes.
3. Keep children and bystanders away while operating a power tool. Distractions can cause you to lose control.

Electrical safety

1. Power tool plugs must match the outlet. Never modify the plug in any way. Do not use any adapter plugs with earthed (grounded) power tools. Unmodified plugs and matching outlets will reduce the risk of electric shock.
2. Avoid body contact with earthed or grounded surfaces, such as pipes, radiators, ranges, and refrigerators. There is an increased risk of electric shock if your body is earthed or grounded.
3. Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock.
4. Do not abuse the cord. Never use the cord for carrying, pulling, or unplugging the power tool. Keep cord away from heat, oil, sharp edges, or moving parts. Damaged or entangled cords increase the risk of electric shock.
5. When operating a power tool outdoors, use an extension cord suitable for outdoor use. The use of a cord suitable for outdoor use reduces the risk of electric shock.
6. If operating a power tool in a damp location is unavoidable, use a residual current device (RCD) protected supply. The use of an RCD reduces the risk of electric shock.
7. Power tools can produce electromagnetic fields (EMF) that are not harmful to the user. However, users of pacemakers and other similar medical devices should contact the maker of their device and/or doctor for advice before operating this power tool.

Personal safety

1. Stay alert, watch what you are doing, and use common sense when operating a power tool. Do not use a power tool while you are tired or under the influence of drugs, alcohol, or medication. A moment of inattention while operating power tools may result in serious personal injury.
2. Use personal protective equipment. Always wear eye protection. Protective equipment such as a dust mask, non-skid safety shoes, hard hats, or hearing protection used for appropriate conditions will reduce personal injuries.
3. Prevent unintentional starting. Ensure the switch is in the off-position before connecting to a power source and/or battery pack, picking up, or carrying the tool. Carrying power tools with your finger on the switch or energizing power tools that have the switch on invites accidents.
4. Remove any adjusting key or wrench before turning the power tool on. A wrench or a key left attached to a rotating part of the power tool may result in personal injury.
5. Do not overreach. Keep proper footing and balance at all times. This enables better control of the power tool in unexpected situations.
6. Dress properly. Do not wear loose clothing or jewelry. Keep your hair and clothing away from moving parts. Loose clothes, jewelry, or long hair can be caught in moving parts.
7. If devices are provided for the connection of dust extraction and collection facilities, ensure these are connected and properly used. The use of dust collection can reduce dust-related hazards.
8. Do not let familiarity gained from the frequent use of tools allow you to become complacent and ignore tool safety principles. A careless action can cause severe injury within a fraction of a second.
9. Always wear protective goggles to protect your eyes from injury when using power tools. The goggles must comply with ANSI Z87.1 in the USA, EN 166 in Europe, or AS/NZS 1336 in Australia/New Zealand. In Australia/New Zealand, it is legally required to wear a face shield to protect your face, too. It is an employer’s responsibility to enforce the use of appropriate safety protective equipment by the tool operators and by other persons in the immediate working area.

Power tool use and care

1. Do not force the power tool. Use the correct power tool for your application. The correct power tool will do the job better and safer at the rate for which it was designed.
2. Do not use the power tool if the switch does not turn on and off. Any power tool that cannot be controlled with the switch is dangerous and must be repaired.
3. Disconnect the plug from the power source and/or remove the battery pack, if detachable, from the power tool before making any adjustments, changing accessories, or storing power tools. Such preventive safety measures reduce the risk of starting the power tool accidentally.
4. Store idle power tools out of the reach of children and do not allow persons unfamiliar with the power tool or these instructions to operate the power tool. Power tools are dangerous in the hands of untrained users.
5. Maintain power tools and accessories. Check for misalignment or binding of moving parts, breakage of parts, and any other condition that may affect the power tool’s operation. If damaged, have the power tool repaired before use. Many accidents are caused by poorly maintained power tools.
6. Keep cutting tools sharp and clean. Properly maintained cutting tools with sharp cutting edges are less likely to bind and are easier to control.
7. Use the power tool, accessories and tool bits, etc. in accordance with these instructions, taking into account the working conditions and the work to be performed. Use of the power tool for operations different from those intended could result in a hazardous situation.
8. Keep handles and grasping surfaces dry, clean, and free from oil and grease. Slippery handles and grasping surfaces do not allow for safe handling and control of the tool in unexpected situations.
9. When using the tool, do not wear cloth work gloves which may be entangled. The entanglement of cloth work gloves in the moving parts may result in personal injury.

Battery tool use and care

1. Recharge only with the charger specified by the manufacturer. A charger that is suitable for one type of battery pack may create a risk of fire when used with another battery pack.
2. Use power tools only with specifically designated battery packs. The use of any other battery packs may create a risk of injury and fire.
3. When the battery pack is not in use, keep it away from other metal objects, like paper clips, coins, keys, nails, screws, or other small metal objects, that can make a connection from one terminal to another. Shorting the battery terminals together may cause burns or a fire.
4. Under abusive conditions, liquid may be ejected from the battery; avoid contact. If contact accidentally occurs, flush with water. If liquid contacts the eyes, additionally seek medical help. Liquid ejected from the battery may cause irritation or burns.
5. Do not use a battery pack or tool that is damaged or modified. Damaged or modified batteries may exhibit unpredictable behavior resulting in fire, explosion, or risk of injury.
6. Do not expose a battery pack or tool to fire or excessive temperature. Exposure to fire or temperature above 130 °C may cause an explosion.
7. Follow all charging instructions and do not charge the battery pack or tool outside the temperature range specified in the instructions. Charging improperly or at temperatures outside the specified range may damage the battery and increase the risk of fire.

Service

1. Have your power tool serviced by a qualified repair person using only identical replacement parts. This will ensure that the safety of the power tool is maintained.
2. Never service damaged battery packs. Service of battery packs should only be performed by the manufacturer or authorized service providers.
3. Follow instructions for lubricating and changing accessories.

General chain saw safety warnings

1. Keep all parts of the body away from the saw chain when the chain saw is operating. Before you start the chain saw, make sure the saw chain is not contacting anything. A moment of inattention while operating chain saws may cause entanglement of your clothing or body with the saw chain.

2. Always hold the chain saw with your right hand on the rear handle and your left hand on the front handle. Holding the chain saw with a reversed hand configuration increases the risk of personal injury and should never be done.

3. Hold the chain saw by insulated gripping surfaces only, because the saw chain may contact hidden wiring. Saw chains contacting a “live” wire may make exposed metal parts of the chain saw “live” and could give the operator an electric shock.

4. Wear eye protection. Further protective equipment for hearing, head, hands, legs, and feet is recommended. Adequate protective equipment will reduce personal injury from flying debris or accidental contact with the saw chain.

5. Do not operate a chain saw in a tree, on a ladder, from a rooftop, or on any unstable support. Operation of a chain saw in this manner could result in serious personal injury.

6. Always keep proper footing and operate the chain saw only when standing on a fixed, secure, and level surface. Slippery or unstable surfaces may cause a loss of balance or control of the chain saw.

7. When cutting a limb that is under tension, be alert for spring back. When the tension in the wood fibers is released, the spring-loaded limb may strike the operator and/or throw the chain saw out of control.

8. Use extreme caution when cutting brush and saplings. The slender material may catch the saw chain and be whipped toward you or pull you off balance.

9. Carry the chain saw by the front handle with the chain saw switched off and away from your body. When transporting or storing the chain saw, always fit the guide bar cover. Proper handling of the chain saw will reduce the likelihood of accidental contact with the moving saw chain.

10. Follow instructions for lubricating, chain tensioning, and changing the bar and chain. The improperly tensioned or lubricated chains may either break or increase the chance of kickback.

11. Cut wood only. Do not use a chain saw for purposes not intended. For example: do not use chain saws for cutting metal, plastic, masonry, or non-wood building materials. Use of the chain saw for operations different than intended could result in a hazardous situation.

12. Do not attempt to fall a tree until you have an understanding of the risks and how to avoid them. Serious injury could occur to the operator or bystanders while falling from a tree.

13. Causes and operator prevention of kickback: 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 sudden 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. Do not rely exclusively upon the safety devices built into your saw. As a chain saw user, you should take several steps to keep your cutting jobs free from accidents or injury.
    Kickback is the result of chain saw misuse and/or incorrect operating procedures or conditions and can be avoided by taking proper precautions as given below:
    • Maintain a firm grip, with thumbs and fingers encircling the chain saw handles, with both hands on the saw, and position your body and arm to allow you to resist kickback forces. Kickback forces can be controlled by the operator, if proper precautions are taken. Do not let go of the chainsaw. • Do not overreach and do not cut above shoulder height. This helps prevent unintended tip contact and enables better control of the chain saw in unexpected situations.
    • Only use replacement guide bars and saw chains specified by the manufacturer. Incorrect replacement guide bars and saw chains may cause chain breakage and/or kickback.
    • Follow the manufacturer’s sharpening and maintenance instructions for the saw chain. Decreasing the depth gauge height can lead to increased kickback.

14. Follow all instructions when clearing jammed material, and storing or servicing the chain saw. Make sure the switch is off and the battery pack is removed. Unexpected actuation of the chain saw while clearing jammed material or servicing may result in serious personal injury.

Additional Safety Instructions Personal protective equipment

1. Clothing must be close-fitting, but must not obstruct mobility.
2. Wear the following protective clothing during work:
   • A tested safety helmet, if a hazard is presented by falling branches or similar;
   • A face mask or goggles;
   • Suitable ear protection (ear muffs, custom or mouldable ear plugs). Octave brand analysis upon request.
   • Firm leather safety gloves;
   • Long trousers manufactured from strong fabric;
   • Protective dungarees of cut-resistant fabric;
   • Safety shoes or boots with non-slip soles, steel toes, and cut-resistant fabric lining;
   • A breathing mask, when carrying out work that produces dust (e.g. sawing dry wood).

Operation

1. Before starting work, check that the chain saw is in proper working order and that its condition complies with the safety regulations. Check in particular that:
   • The chain brake is working properly;
   • The run-down brake is working properly;
   • The bar and the sprocket cover are fitted correctly;
   • The chain has been sharpened and tensioned in accordance with the regulations.

2. Do not start the chain saw with the chain cover being installed on it. Starting the chain saw with the chain cover being installed on it may cause the chain cover to be thrown out forward resulting in personal injury and damage to objects around the operator.

Electrical and battery safety

1. Avoid dangerous environments. Don’t use the tool in damp or wet locations or expose it to rain. Water entering the tool will increase the risk of electric shock.
2. Do not dispose of the battery(ies) in a fire. The cell may explode. Check with local codes for possible special disposal instructions.
3. Do not open or mutilate the battery(ies). Released electrolyte is corrosive and may cause damage to the eyes or skin. It may be toxic if swallowed.
4. Do not charge the battery in rain, or in wet locations.
5. Do not charge the battery outdoors.
6. Do not handle chargers, including charger plugs, and charger terminals with wet hands.
7. Do not replace the battery in the rain.
8. Do not replace the battery with wet hands.
9. Do not leave the battery in the rain, nor charge, use, or store the battery in a damp or wet place.
10. Do not wet the terminal of the battery with a liquid such as water, or submerge the battery. If the terminal gets wet or liquid enters inside of the battery, the battery may be short-circuited and there is a risk of overheating, fire, or explosion.
11. After removing the battery from the machine or charger, be sure to attach the battery cover to the battery and store it in a dry place.
12. If the battery cartridge gets wet, drain the water inside and then wipe it with a dry cloth. Dry the battery cartridge completely in a dry place before use.

SAVE THESE INSTRUCTIONS.
WARNING: DO NOT let comfort or familiarity with the product (gained from repeated use) replace strict adherence to safety rules for the subject product. MISUSE or failure to follow the safety rules stated in this instruction manual may cause serious personal injury.

Important safety instructions for battery cartridge

1. Before using the battery cartridge, read all instructions and cautionary markings on (1) the battery charger, (2) the battery, and (3) the product using the battery.

2. Do not disassemble or tamper with the battery cartridge. It may result in a fire, excessive heat, or explosion.

3. If the operating time has become excessively shorter, stop operating immediately. It may result in a risk of overheating, possible burns, and even an explosion.

4. If electrolyte gets into your eyes, rinse them out with clear water and seek medical attention right away. It may result in loss of your eyesight.

5. Do not short the battery cartridge:
   (1) Do not touch the terminals with any conductive material.
   (2) Avoid storing battery cartridges in a container with other metal objects such as nails, coins, etc.
   (3) Do not expose battery cartridges to water or rain. A battery short can cause a large current flow, overheating, possible burns, and even a breakdown.

6. Do not store and use the tool and battery cartridge in locations where the temperature may reach or exceed 50 °C (122 °F).

7. Do not incinerate the battery cartridge even if it is severely damaged or completely worn out. The battery cartridge can explode in a fire.

8. Do not nail, cut, crush, throw, drop the battery cartridge, or hit a hard object to the battery cartridge. Such conduct may result in a fire, excessive heat, or explosion.

9. Do not use a damaged battery. 10. The contained lithium-ion batteries are subject to the Dangerous Goods Legislation requirements.

10. The contained lithium-ion batteries are subject to the Dangerous Goods Legislation requirements.
    For commercial transports e.g. by third parties and forwarding agents, the special requirements on packaging and labeling must be observed.
    For the preparation of the item being shipped, consulting an expert for hazardous material is required.
    Please also observe possibly more detailed national regulations.
    Tape or mask off open contacts and pack up the battery in such a manner that it cannot move around in the packaging.

11. When disposing of the battery cartridge, remove it from the tool and dispose of it in a safe place. Follow your local regulations relating to the disposal of batteries.

12. Use the batteries only with the products specified by Makita. Installing the batteries to non-compliant products may result in a fire, excessive heat, explosion, or leak of electrolyte.

13. If the tool is not used for a long period of time, the battery must be removed from the tool.

14. During and after use, the battery cartridge may take on heat which can cause burns or low-temperature burns. Pay attention to the handling of hot battery cartridges.

15. Do not touch the terminal of the tool immediately after use as it may get hot enough to cause burns.

16. Do not allow chips, dust, or soil to stuck into the terminals, holes, and grooves of the battery cartridge. It may cause heating, catching fire, burst, and malfunction of the tool or battery cartridge, resulting in burns or personal injury.

17. Unless the tool supports the use near high-voltage electrical power lines, do not use the battery cartridge near high-voltage electrical power lines. It may result in a malfunction or breakdown of the tool or battery cartridge.

18. Keep the battery away from children.

SAVE THESE INSTRUCTIONS.
CAUTION: Only use genuine Makita batteries. Use of non-genuine Makita batteries, or batteries that have been altered, may result in the battery bursting causing fires, personal injury, and damage. It will also void the Makita warranty for the Makita tool and charger.
Tips for maintaining maximum battery life

1. Charge the battery cartridge before completely discharged. Always stop tool operation and charge the battery cartridge when you notice less tool power.
2. Never recharge a fully charged battery cartridge. Overcharging shortens the battery service life.
3. Charge the battery cartridge at room temperature at 10 °C – 40 °C (50 °F – 104 °F). Let a hot battery cartridge cool down before charging it.
4. When not using the battery cartridge, remove it from the tool or the charger.
5. Charge the battery cartridge if you do not use it for a long period (more than six months).

PARTS DESCRIPTION

FUNCTIONAL DESCRIPTION

CAUTION: Always be sure that the tool is switched off and the battery cartridge is removed before adjusting or checking the function of the tool.
Installing or removing the battery cartridge
CAUTION: Always switch off the tool before installing or removing the battery cartridge.
CAUTION: Hold the tool and the battery cartridge firmly when installing or removing the battery cartridge. Failure to hold the tool and the battery cartridge firmly may cause them to slip off your hands and result in damage to the tool and battery cartridge and a personal injury.

1. Red indicator
2. Button
3. Battery cartridge

To remove the battery cartridge, slide it from the tool while sliding the button on the front of the cartridge. To install the battery cartridge, align the tongue on the battery cartridge with the groove in the housing and slip it into place. Insert it all the way until it locks in place with a little click. If you can see the red indicator as shown in the figure, it is not locked completely.
CAUTION: Always install the battery cartridge fully until the red indicator cannot be seen. If not, it may accidentally fall out of the tool, causing injury to you or someone around you.
CAUTION: Do not install the battery cartridge forcibly. If the cartridge does not slide in easily, it is not being inserted correctly.

Indicating the remaining battery capacity
Only for battery cartridges with the indicator

1. Indicator lamps
2. Check button

Press the check button on the battery cartridge to indicate the remaining battery capacity. The indicator lamps light up for a few seconds.

Indicator lamps

|

Remaining capacity

---|---

Lighted

|

Off

|

Blinking

| 75% to 100%
| 50% to 75%
**| 25% to 50%

**| 0% to 25%
| Charge the battery.
| The battery may have malfunctioned.

NOTE: Depending on the conditions of use and the ambient temperature, the indication may differ slightly from the actual capacity.
NOTE: The first (far left) indicator lamp will blink when the battery protection system works.
Tool/battery protection system
The tool is equipped with a tool/battery protection system. This system automatically cuts off power to the motor to extend tool and battery life. The tool will automatically stop during operation if the tool or battery is placed under one of the following conditions:
Overload protection
When the tool or battery is operated in a manner that causes it to draw an abnormally high current, the tool automatically stops. In this situation, turn the tool off and stop the application that caused the tool to become overloaded. Then turn the tool on to restart.
Overheat protection
When the tool or battery is overheated, the tool stops automatically. In this case, let the tool and battery cool before turning the tool on again.
NOTE: In the high-temperature environment, the overheat protection is likely to work, and the tool stops automatically.
Over-discharge protection
When the battery capacity is not enough, the tool stops automatically. In this case, remove the battery from the tool and charge the battery.
Protections against other causes
The protection system is also designed for other causes that could damage the tool and allows the tool to stop automatically. Take all the following steps to clear the causes, when the tool has been brought to a temporary halt or stopped in operation.

1. Turn the tool off, and then turn it on again to restart.
2. Charge the battery(ies) or replace it/them with recharged battery(ies).
3. Let the machine and battery(ies) cool down. If no improvement can be found by restoring the protection system, then contact your local Makita Service Center.

NOTICE: If the tool stops due to a cause not described above, refer to the section for troubleshooting.
Switch action
WARNING: For your safety, this tool is equipped with the lock-off button which prevents the tool from unintended starting. Never use the tool if it starts when you pull the switch trigger without pressing the lock-off button. Ask your local Makita Service Center for repairs.
WARNING: Never disable the lock function or tape down the lock-off button.
CAUTION: Before installing the battery cartridge into the tool, always check to see that the switch trigger actuates properly and returns to the “OFF” position when released.
NOTICE: Do not pull the switch trigger forcibly without pressing the lock-off button. The switch may break.

1. Lock-off button
2. Switch trigger

To prevent the switch trigger from being accidentally pulled, a lock-off button is provided. To start the tool, press the lock-off button and pull the switch trigger. Release the switch trigger to stop.

Checking the chain brake
CAUTION: Hold the chain saw with both hands when switching it on. Hold the rear handle with your right hand, and the front handle with your left. The bar and the chain must not be in contact with any object.
CAUTION: Should the saw chain not stop immediately when this test is performed, the saw may not be used under any circumstances. Consult our authorized service center.

1. Press the lock-off button, then pull the switch trigger. The saw chain starts immediately.
2. Push the front hand guard forwards with the back of your hand. Make sure that the chain saw comes to an immediate standstill.

1. Front hand guard
2. Unlocked position
3. Locked position

Checking the run-down brake
CAUTION: If the saw chain does not stop within one second in this test, stop using the chain saw and consult our authorized service center.
Run the chain saw then release the switch trigger completely. The saw chain must come to a standstill within one second.

ASSEMBLY

CAUTION: Always be sure that the tool is switched off and the battery cartridge is removed before carrying out any work on the tool.
  CAUTION: Do not touch the saw chain with bare hands. Always wear gloves when handling the saw chain.
Installing or removing the saw chain
CAUTION: The saw chain and the guide bar are still hot just after the operation. Let them cool down enough before carrying out any work on the tool.
CAUTION: Carry out the procedure of installing or removing the saw chains in a clean place free from sawdust and the like.
Installing the saw chain
To install the saw chain, perform the following steps:

1. Release the chain brake by pulling the front hand guard.
2. Pull the lever up while pressing its edge.► 1. Lever
3. Turn the lever counterclockwise until the sprocket cover comes off.► 1. Lever 2. Sprocket cover
4. Remove the sprocket cover.
5. Check the direction of the saw chain. Match the direction of the saw chain with that of the mark on the chain saw the body.► 1. Mark on the chain saw the body
6. Fit one end of the saw chain on the top of the guide bar.
7. Fit the other end of the saw chain around the sprocket, then attach the guide bar to the chain saw the body.► 1. Sprocket
8. Turn the adjusting dial to the “-” direction to slide the adjusting pin in the direction of the arrow.► 1. Adjusting dial 2. Adjusting pin
9. Place the sprocket cover on the chain saw so that the adjusting pin is positioned in a small hole on the guide bar.► 1. Sprocket cover 2. Guide bar 3. Hole
10. Turn the lever clockwise fully and turn back the lever a little to keep looseness for adjusting the chain tension.
11. Adjust the chain tension. Refer to the section for adjusting saw chain tension for the procedure.
12. Turn the lever clockwise until the sprocket cover is secured then return it to the original position.► 1. Lever 2. Sprocket cover

Removing the saw chain
To remove the saw chain, perform the following steps:

1. Release the chain brake by pulling the front hand guard.
2. Turn the adjusting dial to the “-” direction to release the saw chain tension.► 1. Adjusting dial
3. Pull the lever up while pressing its edge.► 1. Lever
4. Turn the lever counterclockwise until the sprocket cover comes off.► 1. Lever 2. Sprocket cover
5. Remove the sprocket cover then remove the saw chain and guide bar from the chain saw the body.

Adjusting saw chain tension
CAUTION: Carry out the procedure of installing or removing the saw chains in a clean place free from sawdust and the like.
CAUTION: Do not tighten the saw chain too much. The excessively high tension of the saw chain may cause breakage of the saw chain, wear of the guide bar, and breakage of the adjusting dial.
CAUTION: A chain that is too loose can jump off the bar and it may cause an injury accident. The saw chain may become loose after many hours of use. From time to time check the saw chain tension before use.

1. Pull the lever up while pressing its edge.► 1. Lever
2. Turn the lever counterclockwise a little to loosen the sprocket cover lightly.► 1. Lever 2. Sprocket cover
3. Lift up the guide bar tip slightly and adjust the chain tension. Turn the adjusting dial to the “-” direction to loosen, and turn to the “+” direction to tighten. Tighten the saw chain until the lower side of the saw chain fits in the guide bar rail as illustrated.► 1. Adjusting dial 2. Guide bar 3. Saw chain
4. Keep holding the guide bar lightly and tighten the sprocket cover. Make sure that the saw chain does not loose at the lower side.
5. Return the lever to the original position. Make sure the saw chain fits snugly against the lower side of the bar.

OPERATION

Lubrication
CAUTION: Do not operate the chain saw when the tank is empty. Replenish the oil in due time before the tank is empty.
CAUTION: Prevent the oil from coming into contact with the skin and eyes. Contact with the eyes causes irritation. In the event of eye contact, flush the affected eye immediately with clear water, then consult a doctor at once.
CAUTION: Never use waste oil. Waste oil contains carcinogenic substances. The contaminants in waste oil cause accelerated wear of the oil pump, the bar, and the chain. Waste oil is harmful to the environment.
NOTICE: When the chain saw is used for the first time, it may take up to two minutes for the saw chain oil to begin its lubricating effect upon the saw mechanism. Run the saw without load until it does so.
NOTICE: When filling the chain oil for the first time, or refilling the tank after it has been completely emptied, add oil up to the bottom edge of the filler neck. The oil delivery may otherwise be impaired.
NOTICE: Use the saw chain oil exclusively for Makita chain saws or equivalent oil available in the market.
NOTICE: Never use oil including dust and particles or volatile oil.
NOTICE: When pruning trees, use botanical oil. Mineral oil may harm trees.
NOTICE: Before the cutting operation, make sure that the provided oil tank cap is screwed in place.
The saw chain is automatically lubricated when the tool is in operation. Check the amount of remaining oil in the oil tank periodically through the oil inspection window.

1. Oil tank cap
2. Oil inspection window

To fill the oil, perform the following steps:

1. Clean the area around the oil tank cap thoroughly to prevent any dirt from entering the oil tank.
2.  Lay the chain saw on its side and remove the oil tank cap.
3. Fill the oil tank with the oil. The proper amount of oil is 150 ml.
4. Screw the oil tank cap firmly back in place.
5. Wipe away any spilled chain oil carefully.

NOTE: If it is difficult to remove the oil tank cap, insert the slotted screwdriver into the slot of the oil tank cap, and then remove the oil tank cap by turning it counterclockwise.

1. Slot
2. Slotted screwdriver

After refilling, hold the chain saw away from the tree. Start it and wait until lubrication on the saw chain is adequate.

Working with the chain saw
CAUTION: The first-time user should, as a minimum practice, do cutting logs on a saw-horse or cradle.
CAUTION: When sawing precut timber, use safe support (saw horse or cradle). Do not steady the workpiece with your foot, and do not allow anyone else to hold or steady it.
CAUTION: Secure round pieces against rotation.
CAUTION: Keep all parts of the body away from the saw chain when the motor is operating.
CAUTION: Hold the chain saw firmly with both hands when the motor is running.
CAUTION: Do not overreach. Keep proper footing and balance at all times.
NOTICE: Never toss or drop the tool.
NOTICE: Do not cover the vents of the tool.
Bring the bottom edge of the chain saw body into contact with the branch to be cut before switching on. Otherwise, it may cause the guide bar to wobble, resulting in injury to the operator. Saw the wood to be cut by just moving it down by using the weight of the chain saw.

If you cannot cut the timber right through with a single stroke:
Apply light pressure to the handle and continue sawing and draw the chain saw back a little; then apply the spiked bumper a little lower and finish the cut by raising the handle.

Bucking

1. Rest the bottom edge of the chain saw a body on the wood to be cut.
2. With the saw chain running, the saw into the wood while using the rear handle to raise the saw and the front one to guide it. Use the spiked bumper as a pivot.
3. Continue the cut by applying slight pressure to the front handle, easing the saw back slightly. Move the spiked bumper further down the timber and raise the front handle again.

NOTICE: When making several cuts, switch the chain saw off between cuts.
CAUTION: If the upper edge of the bar is used for cutting, the chain saw may be deflected in your direction if the chain becomes trapped. For this reason, cut with the lower edge, so that the saw will be deflected away from your body.

When you cut wood under tension, cut the pressured side (A) first. Then make the final cut from the tensioned side (B). This prevents the bar from becoming trapped.

Limbing
CAUTION: Limbing may only be performed by trained persons. A hazard is presented by the risk of kickback.
When limbing, support the chain saw on the trunk if possible. Do not cut with the tip of the bar, as this presents a risk of kickback. Pay particular attention to branches under tension. Do not cut unsupported branches from below. Do not stand on the felled trunk when limbing.

Burrowing and parallel-to-grain cuts
CAUTION: Burrowing and parallel-to-grain cuts may only be carried out by persons with special training. The possibility of kickback presents a risk of injury.
Perform parallel-to-grain cuts at as shallow an angle as possible. Take extra caution when carrying out the cut as the spiked bumper cannot be used.

Felling
CAUTION: Felling work may only be performed by trained persons. The work is hazardous.
Observe local regulations if you wish to fell a tree.► 1. Felling area
— Before starting felling work, ensure that:

• Only persons involved in the felling operation are in the vicinity;
• Any person involved has an unhindered path of retreat through a range of approximately 45° on either side of the felling axis. Consider the additional risk of tripping over electrical cables;
• The base of the trunk is free of foreign objects, roots, and ranches;
• No persons or objects are present over a distance of 2 1/2 tree lengths in the direction in which the tree will fall.

— Consider the following with respect to each tree:

• The direction of lean;
• Loose or dry branches;
• Height of the tree;
• Natural overhang;
• Whether or not the tree is rotten.

— Consider the wind speed and direction. Do not carry out felling work if the wind is gusting strongly.
— Trimming of root swellings: Begin with the largest swellings. Make the vertical cut first, then the horizontal cut.
— Stand to the side of the falling tree. Keep an area clear to the rear of the falling tree up to an angle of45° on either side of the tree axis (refer to the “felling area” figure). Pay attention to falling branches.
— An escape path should be planned and cleared as necessary before cuts are started. The escape path should extend back and diagonally to the rear of the expected line of fall as illustrated in the figure.

1. Felling direction
2. Danger zone
3. Escape route

When felling trees, follow the procedures below:

1. Cut a scarf as close to the ground as possible.
   First, make the horizontal cut to a depth of 1/5 -1/3 of the trunk diameter. Do not make the scarf too large. Then make the diagonal cut. NOTE: The scarf determines the direction in which the tree will fall, and guides it. It is made on the side towards which the tree is to fall.

2. Make the back cut a little higher than the base cut of the scarf. The back cut must be exactly horizontal. Leave approximately 1/10 of the trunk diameter between the back cut and the scarf. The wood fibers in the uncut trunk portion act as a hinge. Insert wedges into the back cut in time.

WARNING: Do not cut right through the fibers under any circumstances. The tree will otherwise fall unchecked.
NOTICE: Only plastic or aluminum wedges may be used to keep the back cut open. The use of iron wedges is prohibited.

Carrying tool
Before carrying the tool, always apply the chain brake and remove the battery cartridge from the tool. Then attach the guide bar cover. Also, cover the battery cartridge with the battery cover.

1. Guide bar covers
2. Battery cover

MAINTENANCE

CAUTION: Always be sure that the tool is switched off and the battery cartridge is removed before attempting to perform inspection or maintenance.
CAUTION: Always wear gloves when perform- ing any inspection or maintenance.
NOTICE: Never use gasoline, benzene, thinner, alcohol, or the like. Discoloration, deformation, or cracks may result.
To maintain product SAFETY and RELIABILITY, repairs, and any other maintenance or adjustment should be performed by Makita Authorized or Factory Service Centers, always using Makita replacement parts.

Sharpening the saw chain

Sharpen the saw chain when:

• Mealy sawdust is produced when damp wood is cut;
• The chain penetrates the wood with difficulty, even when heavy pressure is applied;
• The cutting edge is obviously damaged;
• The saw pulls to the left or right in the wood. (caused by the uneven sharpening of the saw chain or damage to one side only)

Sharpen the saw chain frequently but a little each time. Two or three strokes with a file are usually sufficient for routine resharpening. When the saw chain has been resharpened several times, have it sharpened in our authorized service center.
Sharpening criteria:
WARNING: An excessive distance between the cutting edge and depth gauge increases the risk of kickback.

1. Cutter length
2. Distance between cutting edge and depth gauge
3. Minimum cutter length (3 mm)

• All cutter lengths must be equal. Different cutter lengths prevent the saw chain from running smoothly and may cause the saw chain to break.

• Do not sharpen the chain when the cutter length has reached 3 mm or shorter. The chain must be replaced with a new one.

• The chip thickness is determined by the distance between the depth gauge (round nose) and the cutting edge.

• The best cutting results are obtained with the following distance between the cutting edge and depth gauge.
  • Chain blade 90PX: 0.65 mm
  • Chain blade 91PX: 0.65 mm

• The sharpening angle of 30° must be the same on all cutters. Different cutter angles cause the chain to run roughly and unevenly, accelerate wear, and lead to chain breaks.

• Use a suitable round file so that the proper sharpening angle is kept against the teeth.
  • Chain blade 90PX: 55°
  • Chain blade 91PX: 55°

File and file guiding

• Use a special round file (optional accessory) for saw chains to sharpen the chain. Normal round files are not suitable.

• The diameter of the round file for each saw chain is as follows:
  • Chain blade 90PX: 4.5 mm
  • Chain blade 91PX: 4.0 mm

• The file should only engage the cutter on the forward stroke. Lift the file of the cutter on the return stroke.

• Sharpen the shortest cutter first. Then the length of this shortest cutter becomes the standard for all other cutters on the saw chain.

• Guide the file as shown in the figure.

• The file can be guided more easily if a file holder (optional accessory) is employed. The file holder has markings for the correct sharpening angle of 30° (align the markings parallel to the saw chain) and limits the depth of penetration (to 4/5 of the file diameter).► 1. File holder

• After sharpening the chain, check the height of the depth gauge using the chain gauge tool (optional accessory).

• Remove any projecting material, however small, with a special flat file (optional accessory).

• Round off the front of the depth gauge again.

Cleaning the guide bar
Chips and sawdust will build up in the guide bar groove. They may clog the bar groove and impair the oil flow.
Clean out the chips and sawdust every time when you sharpen or replace the saw chain.

Cleaning the sprocket cover
Chips and saw dust will accumulate inside of the sprocket cover. Remove the sprocket cover and saw chain from the tool then clean the chips and saw dust.

Cleaning the oil discharge hole
Small dust or particles may be built up in the oil discharge hole during operation.
These dust or particles may impair the oil flow and cause insufficient lubrication on the whole saw chain. When a poor chain oil delivery occurs at the top of the guide bar, clean the oil discharge hole as follows.

1. Remove the sprocket cover and saw chain from the tool.
2. Remove the small dust or particles using a slotted screwdriver or the like.► 1. Slotted screwdriver 2. Oil discharge hole
3. Insert the battery cartridge into the tool. Pull the switch trigger to flow built-up dust or particles of the oil discharge hole by discharging chain oil.
4. Remove the battery cartridge from the tool. Reinstall the sprocket cover and saw chain on the tool.

Replacing the sprocket
CAUTION: A worn sprocket will damage a new saw chain. Has the sprocket been replaced in this case?
Before fitting a new saw chain, check the condition of the sprocket.

1. Sprocket
2. Areas to be worn out

Always fit a new locking ring when replacing the sprocket.

1. Locking ring
2. Sprocket

NOTICE: Make sure that the sprocket is installed as shown in the figure.

Storing the tool

1. Clean the tool before storing it. Remove any chips and sawdust from the tool after removing the sprocket cover.
2. After cleaning the tool, run it under no load to lubricate the saw chain and guide bar.
3. Cover the guide bar with the guide bar cover.
4. Empty the oil tank.

Instructions for periodic maintenance

To ensure long life, prevent damage, and ensure the full functioning of the safety features, the following maintenance must be performed regularly. Warranty claims can be recognized only if this work is performed regularly and properly. Failure to perform the prescribed maintenance work can lead to accidents! The user of the chain saw must not perform maintenance work that is not described in the instruction manual. All such work must be carried out by our authorized service center.

Check item / Operating time| Before operation| Everyday| Every week| Every 3 month| Annually| Before storage
---|---|---|---|---|---|---
Chain saw| Inspection.| | –| –| –| –| –
Cleaning.| –| | –| –| –| –
Check at an authorized service center.| –| –| –| –| |
Saw chain| Inspection.| | –| –| –| –| –
Sharpening if necessary.| –| –| –| –| –|
Guide bar| Inspection.| | | –| –| –| –
Remove from the chain saw.| –| –| –| –| –|
Chain brake| Check the function.| | –| –| –| –| –
Has it been inspected regularly at an authorized service center?| –| –| –| | –| –
Chain lubrication| Check the oil feed rate.| | –| –| –| –| –
Switch trigger| Inspection.| | –| –| –| –| –
Lock-off button| Inspection.| | –| –| –| –| –
Oil tank cap| Check tightness.| | –| –| –| –| –
Chain catcher| Inspection.| –| –| | –| –| –
Screws and nuts| Inspection.| –| –| ****| –| –| –

TROUBLESHOOTING

Before asking for repairs, conduct your own inspection first. If you find a problem that is not explained in the manual, do not attempt to dismantle the tool. Instead, ask Makita Authorized Service Centers, always using Makita replacement parts for repairs.

Install a charged battery cartridge.
Battery problem (low voltage).| Recharge the battery cartridge. If recharging is not effective, replace the battery cartridge.
The saw chain does not run.| Chain brake activated.| Release chain brake.
The motor stops running after a little use.| The battery’s charge level is low.| Recharge the battery cartridge. If recharging is not effective, replace the battery cartridge.
No oil on the chain.| The oil tank is empty.| Fill the oil tank.
The oil guide groove is dirty.| Clean the groove.
The chain saw does not reach maximum RPM.| The battery cartridge is installed improperly.| Install the battery cartridge as described in this manual.
Battery power is dropping.| Recharge the battery cartridge. If recharging is not effective, replace the battery cartridge.
The drive system does not work correctly.| Ask the authorized service center in your region for repair.
The chain does not stop even the chain brake is activated:
Stop the tool immediately!| The brake band is worn down.| Ask the authorized service center in your region for repair.
Abnormal vibration:
Stop the tool immediately!| Loose guide bar or saw chain.| Adjust the guide bar and saw chain tension.
Tool malfunction.| Ask the authorized service center in your region for repair.
The saw chain cannot be installed.| The combination of saw chain and sprocket is not correct.| Use the correct combination of saw chain and sprocket by referring to the section for specifications.

OPTIONAL ACCESSORIES

CAUTION: These accessories or attachments are recommended for use with your Makita tool specified in this manual. The use of any other accessories or attachments might present a risk of injury to persons. Only use accessory or attachment for its stated purpose.
If you need any assistance with more details regarding these accessories, ask your local Makita Service Center.

• Saw chain
• Guide bar
• Guide bar cover
• File
• Toolbag
• Makita genuine battery and charger

WARNING: If you purchase a guide bar of different lengths from the standard guide bar, also purchase a suitable guide bar cover together. It must fit and fully cover the guide bar on the chain saw.
NOTE: Some items in the list may be included in the tool package as standard accessories. They may differ from country to country.

Makita Corporation
3-11-8, Sumiyoshi-cho,
Anjo, Aichi 446-8502 Japan
www.makita.com
885980-922
20220419

Documents / Resources

| makita DUC Series Cordless Chain Saw [pdf] Instruction Manual
DUC307, DUC357, DUC407, DUC Series Cordless Chain Saw, DUC Series, Cordless Chain Saw, Chain Saw, Cordless Saw, Saw
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References

• MAKITA Industrial Power Tools - The Leader In Cordless with 18V LXT Lithium-Ion

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