CRAFTSMAN 316.796170 4 Cycle Weed Wacker Gas Trimmer Instruction Manual

Operator’s Manual
4-Cycle
WEEDWACKER® GAS TRIMMER
Model No. 316.796170

CAUTION: Before using this product, read this manual and follow all safety rules and operating instructions.

RULES FOR SAFE OPERATION

CALIFORNIA PROPOSITION 65 WARNING

WARNING
THE ENGINE EXHAUST FROM THIS PRODUCT CONTAINS CHEMICALS KNOWN TO THE STATE OF CALIFORNIA TO CAUSE CANCER, BIRTH DEFECTS OR OTHER REPRODUCTIVE HARM.

SPARK ARRESTOR NOTE
NOTE: For users on U.S. Forest Land and in the states of California, Maine, Oregon and Washington. All U.S. Forest Land and the state of California (Public Resources Codes 4442 and 4443), Oregon and Washington require, by law that certain internal combustion engines operated on forest brush and/or grass-covered areas be equipped with a spark arrestor, maintained in effective working order, or the engine be constructed, equipped and maintained for the prevention of fire. Check with your state or local authorities for regulations pertaining to these requirements. Failure to follow these requirements could subject you to liability or a fine. This unit is factory equipped with a spark arrestor. If it requires replacement, ask a Sears or other qualified service dealer to install the Accessory Part #753-05297 Spark Arrestor Kit.
WARNING: When using the unit, you must follow the safety rules. Please read these instructions before operating the unit in order to  ensure the safety of the operator and any bystanders. Please keep these instructions for later use.
All information, illustrations, and specifications in this manual are based on the latest product information available at the time of printing. We reserve the right to make changes at any time without notice.

• IMPORTANT SAFETY INSTRUCTIONS •

READ ALL INSTRUCTIONS BEFORE OPERATING

•  Read the instructions carefully. Be familiar with the controls and proper use of the unit.

• Do not operate this unit when tired, ill, or under the influence of alcohol, drugs, or medication.

• Children and teens under the age of 15 must not use the unit, except for teens guided by an adult.

•  All guards and safety attachments must be installed properly before operating the unit.

• Inspect the unit before use. Replace damaged parts. Check for fuel leaks. Make sure all fasteners are in place and secure.
  Replace parts that are cracked, chipped, or damaged in any way. Do not operate the unit with loose or damaged parts.

• Use only Hassle Free™ XRTA QUIET Spiral Line. Never use metal-reinforced line, wire or rope. These can break off and become dangerous projectiles.

• Be aware of risk of injury to the head, hands and feet.

• Clear the area to be cut before each use. Remove rocks, broken glass, nails, wire, string and other objects which may be thrown or become entangled in the cutting attachment. Clear the area of children, bystanders and pets; keep them outside a 50-foot (15 m) radius, at a minimum. Even then, they are still at risk from thrown objects. Encourage bystanders to wear eye protection. If you are approached, stop the unit immediately.

• Squeeze the throttle control and check that it returns automatically to the idle position. Make all adjustments or repairs before using unit.

WARNING: Gasoline is highly flammable, and its vapors can explode if ignited. Take the following precautions:

FUEL SAFETY WARNINGS FOR GAS UNITS

• Store fuel only in containers specifically designed and approved for the storage of such materials.
• Avoid creating a source of ignition for spilled fuel. Do not start the engine until fuel vapors dissipate.
• Always stop the engine and allow it to cool before filling the fuel tank. Never remove the fuel tank cap or add fuel when the engine is hot. Never operate the unit without the fuel cap securely in place. Loosen the fuel tank cap slowly to relieve any pressure in the tank.
• Add fuel in a clean, well-ventilated outdoor area where there are no sparks or flames. Remove the fuel cap slowly, and only after the engine stops. Do not smoke while fueling. Wipe up any spilled fuel from the unit immediately.
• Move the unit at least 30 feet (9.1 m) from the fueling source and site before starting the engine. Do not smoke. Keep sparks and open flames away from the area while adding fuel or operating the unit.

WHILE OPERATING

• Never start or run the unit inside a closed room or building. Breathing exhaust fumes can be fatal. Operate this unit only in a well-ventilated outdoor area.

• Wear safety glasses or goggles that meet ANSI Z87.1 standards and are marked as such. Wear ear/hearing protection when operating this unit. Wear a face or dust mask if the operation is dusty.

• Wear heavy long pants, boots, gloves and a long sleeve shirt.
  Do not wear loose clothing, jewelry, short pants, sandals or go barefoot. Secure hair above shoulder level.

• The cutting attachment shield must always be in place while operating the unit as a trimmer. Do not operate unit without both trimming lines extended, and the proper line installed. Do not extend the trimming line beyond the length of the shield.

• This unit has a clutch. The cutting attachment remains stationary when the engine is idling. If it does not, take the unit to a Sears or other qualified service dealer for an adjustment.

• Adjust the D-handle to your size in order to provide the best grip.

• Be sure the cutting attachment is not in contact with anything before starting the unit.

• Use the unit only in daylight or good artificial light.

•  Avoid accidental starting. Be in the starting position whenever pulling the starter rope. The operator and unit must be in a stable position while starting. Refer to Starting/Stopping Instructions.

• Use the right tool. Only use this tool for its intended purpose.

• Do not overreach. Always keep proper footing and balance.

• Always hold the unit with both hands when operating. Keep a firm grip on both handles or grips.

• Keep hands, face, and feet at a distance from all moving parts.
  Do not touch or try to stop the cutting attachment when it rotates.

• Do not touch the engine, gear housing or muffler. These parts get extremely hot from operation, even after the unit is turned off.

• Do not operate the engine faster than the speed needed to cut, trim or edge. Do not run the engine at high speed when not cutting.

• Always stop the engine when cutting is delayed or when walking from one cutting location to another.

• If you strike or become entangled with a foreign object, stop the engine immediately and check for damage. Do not operate before repairing damage. Do not operate the unit with loose or damaged parts.

• Stop the unit, switch the engine to off, and disconnect the spark plug for maintenance or repair.

• Use only replacement parts or accessories recommended for this tool that are distributed by Sears or a Craftsman outlet.
  Use of any replacement parts or accessories purchased elsewhere may be hazardous, and will also void your warranty.

• Keep unit clean of vegetation and other materials. They may become lodged between the cutting attachment and shield.

• To reduce fire hazard, replace a faulty muffler and spark arrestor. Keep the engine and muffler free from grass, leaves, excessive grease or carbon build up.

OTHER SAFETY WARNINGS

• Never store the unit with fuel in the tank, inside a building where fumes may reach an open flame (pilot lights, etc.) or sparks (switches, electrical motors, etc.).

• Allow the engine to cool before storing or transporting. Be sure to secure the unit while transporting.

• Store the unit in a dry area, locked up or up high to prevent unauthorized use or damage, out of the reach of children.

• Never douse or squirt the unit with water or any other liquid.
  Keep handles dry, clean and free from debris. Clean after each use, see Cleaning and Storage Instructions.

• Keep these instructions. Refer to them often and use them to instruct other users. If you loan someone this unit, also loan them these instructions.

SAVE THESE INSTRUCTIONS

SAFETY AND INTERNATIONAL SYMBOLS
This operator’s manual describes safety and international symbols and pictographs that may appear on this product. Read the operator’s manual for complete safety, assembly, operating and maintenance and repair information.

Indicates danger, warning or caution. May be used in conjunction with other symbols or pictographs.
| • WARNING – READ OPERATOR’S MANUAL
Read the operator’s manual(s) and follow all warnings and safety instructions. Failure to do so can result in serious injury to the operator and/or bystanders.
| • WEAR EYE AND HEARING PROTECTION
WARNING: Thrown objects and loud noise can cause severe eye injury and hearing loss.
Wear eye protection meeting ANSI Z87.1 standards and ear protection when operating this unit. Use a full face shield when needed.
| • HOT SURFACE WARNING
Do not touch a hot muffler, gear housing or cylinder. You may get burned. These parts get extremely hot from operation. They remain hot for a short time after the unit is turned off.
| • UNLEADED FUEL
Always use clean, fresh unleaded fuel
| • OIL
Refer to operator’s manual for the proper type of oil.
| • KEEP BYSTANDERS AWAY
WARNING: Keep all bystanders, especially children and pets, at least 50 feet (15 m) from the operating area.
| • CHOKE CONTROL
1. • FULL choke position
2. • PARTIAL choke position
3. • RUN choke position
| • THROWN OBJECTS AND ROTATING CUTTER CAN CAUSE SEVERE INJURY
WARNING: Do not operate without the cutting attachment shield in place. Keep away from the rotating cutting attachment.
| • SHARP BLADE
WARNING: Sharp blade on cutting attachment shield.  To prevent serious injury, do not touch the line cutting blade.
| • ON/OFF STOP CONTROL
ON / START / RUN
| • ON/OFF STOP CONTROL
OFF or STOP

WARRANTY STATEMENT

CRAFTSMAN TWO-YEAR LIMITED WARRANTY

If this Craftsman product fails due to a defect in material or workmanship within two years from the date of purchase, return it to any Sears store, Sears Service Center, or other Craftsman outlet in the United States for free repair. This warranty does not include:

• Expendable items which can wear out from normal use within the warranty period, such as cutting line, air cleaner or spark plug..
• Repairs necessary because of operator abuse or negligence and the failure to operate or maintain the equipment according to all supplied instructions.

This warranty applies for only 90 days if this product is ever used for commercial or rental purposes. This warranty applies only while this product is used in the United States. This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
Sears, Roebuck and Co., Hoffman Estates, IL 60179

Owner’s Warranty Responsibilities

• As the small off-road engine owner, you are responsible for the performance of the required maintenance listed in your operator’s manual. Sears recommends that you retain all receipts covering maintenance on your small off-road engine, but Sears cannot deny warranty solely for the lack of receipts or for your failure to ensure the performance of all scheduled maintenance.
• As the small off-road engine owner, you should however be aware that Sears may deny you warranty coverage if your small off-road engine or a part has failed due to abuse, neglect, improper maintenance or unapproved modifications.
• You are responsible for presenting your small off-road engine to a Sears authorized service center as soon as problem exists. The warranty repairs should be completed in a reasonable amount of time, not to exceed 30 days.
  If you have any questions regarding your warranty rights and responsibilities, you should call 1-800-4-MY-HOME®.

Manufacturer’s Warranty Coverage

• The warranty period begins on the date the engine or equipment is delivered to the retail purchaser.

• The manufacturer warrants to the initial owner and each subsequent purchaser, that the engine is free from defects in material and workmanship which cause the failure of a warranted part for a period of two years.

• Repair and replacement of warranted part will be performed at no charge to the owner at an authorized Sears service center. For the nearest location please contact Sears at: 1-800-4-MY-HOME®

• 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” is warranted for the 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.

• The owner will not be charged for diagnostic labor which leads to the determination that a warranted part is defective if the diagnostic work is performed at an authorized Sears Service Center.

• The manufacturer is liable for damages to other engine components caused by the failure of a warranted part still under warranty.

• Failures caused by abuse, neglect or improper maintenance are not covered under warranty.

• The use of add-on or modified parts can be grounds for disallowing a warranty claim. The manufacturer is not liable to cover failures of warranted parts caused by the use of add-on or modified parts.

• In order to file a claim, go to your nearest authorized Sears Service Center. Warranty service or repairs will be provided at all authorized Sears Service Centers.

• Any manufacturer approved replacement part may be used in the performance of any warranty maintenance or repair of emission related parts and will be provided without charge to the owner. Any replacement part that is equivalent in performance or durability may be used in non-warranty maintenance or repair and will not reduce the warranty obligations of the manufacturer.

• The following components are included in the emission related warranty: engine, air filter, carburetor, primer, fuel lines, fuel pick up/fuel filter, ignition module, spark plug and muffler.

KNOW YOUR UNIT

ASSEMBLY INSTRUCTIONS

INSTALLING AND ADJUSTING THE D-HANDLE

1. Remove the screws and bottom clamp piece that were installed on the D-handle for shipping.
2. Place D-handle the over the shaft housing and onto the bottom clamp (Fig. 1). Place it a minimum of 6 inches (15.24 cm) from the end of the shaft grip.
3. Start screws with a large Flat-head or T-25 Torx screwdriver. Do not tighten until you make the handle adjustment.
4. If the D-handle was pre-installed, loosen the screws on the handle just enough to move it.
5. While holding the unit in the operating position (Fig. 13), position the D-handle to the location that provides you the best grip.
6. Tighten the clamp screws evenly, until the D-handle is secure.

INSTALL LINE TRIMMER ATTACHMENT
NOTE: To make installation easier, place the unit on the ground or on a workbench.

1. Turn knob counterclockwise to loosen coupler (Fig. 15, p. 8).

2. While firmly holding attachment, push it straight into the coupler until the release button snaps into the primary hole (Fig. 16, p. 9).
   NOTE: Aligning the release button with the guide recess (Fig. 16, p. 9) will help installation.

3. Turn the knob clockwise to tighten.

LINE TRIMMER APPLICATIONS
Cutting grass and light weeds; edging; and decorative trimming around trees, fences, etc.

OIL AND FUEL INFORMATION

WARNING: OVERFILLING OIL CRANKCASE MAY CAUSE SERIOUS PERSONAL INJURY. Check and maintain the proper oil level in the crank case; it is important and cannot be overemphasized. Check the oil before each use and change it as needed.
See Changing the Oil.

RECOMMENDED OIL TYPE
Using the proper type and weight of oil in the crankcase is extremely important. Check the oil before each use and change the oil regularly. Failure to use the correct oil, or using dirty oil, can cause premature engine wear and failure.
Use a high-quality SAE 30 weight oil of API (American Petroleum Institute) service class SF, SG, SH.

ADDING OIL TO CRANKCASE: INITIAL USE
NOTE: This unit is shipped without oil. In order to avoid damage to the unit, put oil in the crankcase before you attempt to start the unit.
Your unit is supplied with one 3.04 fluid oz. (90 ml.) bottle of SAE 30 SF, SG, SH oil (Fig. 3).

NOTE: Save the empty oil bottle.
It can be used to measure the correct amount during future oil changes. See Changing the Oil.

1. Unscrew the top of the bottle of oil and remove the paper seal covering the opening. Replace the top. Next, cut the tip off the funnel spout (Fig. 3).
2. Tip unit so that the back of the engine is facing up in a vertical position.
3. Remove the oil fill plug from the crankcase (Fig. 4).
4. Pour the entire bottle of oil into the oil fill hole (Fig. 5). NOTE: Never add oil to the fuel or fuel tank.
5. Wipe up any oil that may have spilled and reinstall the oil fill plug.

Check oil before each use and change as needed. Refer to Checking the Oil Level.

RECOMMENDED FUEL TYPE
Old fuel is the primary reason for improper unit performance.
Be sure to use fresh, clean, unleaded gasoline.
NOTE: This is a four cycle engine. In order to avoid damage to the unit, do not mix oil with gasoline.

Definition of Blended Fuels
Today’s fuels are often a blend of gasoline and oxygenates such as ethanol, methanol or MTBE (ether). Alcohol-blended fuel absorbs water. As little as 1% water in the fuel can form acids when stored. Use fresh fuel (less than 60 days old), when using alcohol-blended fuel.

Using Blended Fuels
If you choose to use a blended fuel, or its use is unavoidable, follow recommended precautions:

• Always use fresh unleaded gasoline
• Use a gas stabilizer fuel additive
• Drain tank and run the engine dry before storing unit

Using Fuel Additives
The use of a gas stabilizer will inhibit corrosion and minimize the formation of gum deposits. Using a fuel additive can keep fuel from forming harmful deposits in the carburetor for up to six (6) months. Add 0.8 oz. (23 ml.) of fuel additive per gallon of fuel according to the instructions on the container. NEVER add fuel additives directly to the unit’s gas tank.

WARNING: Add fuel in a clean, well ventilated outdoor area. Wipe up any spilled fuel immediately.
Avoid creating a source of ignition for spilt fuel. Do not start the engine until fuel vapors dissipate.
WARNING: Gasoline is extremely flammable.
Ignited vapors may explode. Always stop the engine and allow it to cool before filling the fuel tank. Do not smoke while filling the tank. Keep sparks and open flames at a distance from the area.

FUELING THE UNIT

1. Remove the fuel cap (Fig. 6).
   WARNING: Remove fuel cap slowly to avoid injury from fuel spray. Never operate the unit without the fuel cap securely in place.

2. Place the gas container’s spout into the fill hole on the fuel tank (Fig. 5) and fill the tank.
   NOTE: Do not overfill the tank.

3. Wipe up any gasoline that may have spilled.

4. Reinstall the fuel cap.

5. Move the unit at least 30 ft. (9.1 m) from the fueling source and site before starting the engine.

NOTE: Dispose of the old gasoline in accordance to Federal, State and Local regulations.

STARTING/STOPPING INSTRUCTIONS

WARNING: Operate this unit only in a well-ventilated outdoor area. Carbon monoxide exhaust  fumes can be lethal in a confined area.
WARNING: Avoid accidental starting. Make sure you are in the starting position when pulling the starter rope (Fig. 8). To avoid serious injury, the operator and unit must be in a stable position while starting.

STARTING INSTRUCTIONS

1. Check the oil level in the crankcase. Refer to Checking the Oil Level.

2. Fill the fuel tank with fresh, clean unleaded gasoline.
   Refer to Fueling the Unit.
   NOTE: There is no need to turn the unit on. The On/Off Stop Control is in the ON ( I ) position at all times.

3. Fully press and release the primer bulb 10 times, slowly. Some amount of fuel should be visible in the primer bulb and fuel lines (Fig. 8). If you can’t see fuel in the bulb, press and release the bulb as many times as it takes before you can see fuel in it.

4. Place the choke lever in Position 1 (Fig. 8).

5. Crouch in the starting position (Fig. 9). Squeeze the throttle control lever. Pull the starter rope out with a slow and steady motion 5 times.

6. Place the choke lever in Position 2 (Fig. 8).

7. While squeezing the throttle control , pull the starter rope out with a slow and steady motion 1 to 4 times to start the engine.

8. Keep the throttle squeezed and allow the engine to warm up for 15 to 30 seconds.

9. Place the choke lever in Position 3 (Fig. 8). The unit is ready for use.

IF… The engine does not start, go back to step 3.
IF… The engine fails to start after a few attempts, place the choke lever in Position 3 and squeeze the throttle control. Pull the starter rope out with a slow and steady motion 3 to 8 times, the engine should start. If not, pull 3 to 8 more times.
NOTE: The unit uses the Incredi-Pull™ starting system with MAX FIRE IGNITION™ , which significantly reduces the effort required to start the engine.
You must pull the starter rope out far enough to hear the engine attempt to start. There is no need to pull the rope briskly– there is no harsh resistance when pulling. Be aware that this starting method is vastly different from (and much easier than) what you  may be used to.

STOPPING INSTRUCTIONS

1. Release your hand from the throttle control. Allow the engine to cool down by idling.
2. Press and hold On/Off Stop Control in the OFF (O) position until engine comes to a complete stop (Fig. 7)

OPERATING INSTRUCTIONS

WARNING: Always wear eye, hearing, foot and body protection to reduce the risk of injury when operating this unit.

HOLDING THE TRIMMER
Before operating the unit, stand in the operating position (Fig. 10). Check for the following:

• The operator is wearing eye protection and proper clothing
• With a slightly-bent right arm, the operator’s right hand is holding the shaft grip
• The operator’s left arm is straight, the left hand holding the assist handle
• The unit is at waist level
• The cutting attachment is parallel to the ground and easily contacts the grass without the need to bend over

LINE REPLACEMENT
for Hassle-Free™ Cutting Head
Always use Craftsman Hassle-Free™
XTRA QUIET Spiral Line. Choose the line size best suited for the job at hand. Red colored line is designed for cutting grass and small weeds. Black colored line is designed for cutting larger weeds and light brush.

NOTE: Before inserting new line into the holes in the cutting head, identify the proper holes. Follow directions as shown on the line glide plate. Do Not attempt to remove the cutting head from the unit when replacing line.

WARNING: Do not remove or alter the line cutting blade assembly. Excessive line length will make the clutch overheat. This may lead to serious personal injury or damage to the unit.

1. Remove the old line and line glide plate from the cutting head.

2. Clean entire surface of cutting head. Note positions “A” and “B” on the cutting head.

3. Reinstall line glide plate (Fig. 11). Align arrow with: “A” when using medium (red) or large (black) line, or “B” when using lines with diameters smaller than medium (red) line
   NOTE: Line glide plate must be reinstalled in cutting head before inserting new line.

4. Insert both ends of your line through the proper holes in the side of the cutting head (Fig. 12). ****

5. Pull the line and make sure the line is against the hub and is fully extended through the positioning tunnels (Fig. 13).

6. Correctly installed line will be the same length on both sides.

NOTE: Do not rest the Hassle-Free™ Cutting Head on the ground while the unit is running.

Some line breakage will occur from:

• Entanglement with foreign matter
• Normal line fatigue
• Attempting to cut thick, stalky weeds
• Forcing the line into objects such as walls or fence posts

TIPS FOR BEST TRIMMING RESULTS

• For best trimming results, operate unit at full throttle.
• Keep the cutting attachment parallel to the ground.
• Do not force the cutting attachment. Allow the tip of the line to do the cutting, especially along walls. Cutting with more than the tip will reduce cutting efficiency and may overload the engine.
• Cut grass over 8 inches (200 mm) by working from top to bottom in small increments to avoid premature line wear or engine drag.
• Cutting from right to left improves the unit’s cutting efficiency. Clippings are thrown away from the operator.
• Slowly move the trimmer into and out of the cutting area at the desired height. Move either in a forward-backward or side-to-side motion. Cutting shorter lengths produces the best results.
• Trim only when grass and weeds are dry.
• The life of your cutting line is dependent upon proper adherence of explained trimming techniques, what vegetation is cut, and where vegetation is cut.

For example, the line will wear faster when trimming against a foundation wall as opposed to trimming around a tree.

DECORATIVE TRIMMING Decorative trimming is accomplished by removing all vegetation around trees, posts, fences and more.
Rotate the whole unit so that the cutting attachment is at a 30° angle to the ground (Fig. 14).

USING THE TWIST AND EDGE™ FEATURE
WARNING: Before you begin using any attachment, read and understand the manual that came with the attachment. Follow all safety information contained within.
WARNING: To avoid serious personal injury and damage to the unit, shut the unit off before removing or installing add-ons.

You can convert this unit to edge grass.

1. Make sure the unit is turned completely off.
2. Turn the knob counterclockwise to loosen coupler (Fig. 15).
3. Push in the release button (Fig. 16) and twist the shaft 90° until the release button snaps into the 90° hole (Fig. 15).
4. Turn the knob clockwise to lock the coupler (Fig. 17).

CRAFTSMAN CONVERTIBLE™ FEATURE
The coupler allows you to convert this unit for use with the following add-on attachments:

• Cultivator
• Blade Edger
• Blower
• Brush Cutter
• Pruner

CAUTION: These add-on attachments are to be snapped into the primary hole only. Using the wrong hole could lead to personal injury or damage to the unit.

To Install Attachments
NOTE: To make installation easier, place the unit on the ground or on a workbench.

1. Make sure the unit is turned completely off.
2. Turn the knob counterclockwise to loosen the coupler (Fig. 15).
3. While firmly holding the attachment, push it straight into the coupler until the release button (Fig. 16) snaps into the primary hole (Fig. 16). The primary hole is on the opposite side of the coupler from the knob (Fig. 16). Align the release button with the Guide Recess (Fig. 16) to help installation.
4. Turn the knob clockwise to tighten.

CAUTION: Before operating this unit, be sure that the release button is fully snapped into the primary hole (Fig. 16), and that the knob (Fig. 17) is securely tightened.

To Remove Attachments

1. Make sure the unit is turned completely off
2. Turn the knob counterclockwise to loosen the coupler.
3. Press and hold the release button (Fig. 16).
4. While firmly holding the upper shaft boom (Fig. 17), pull the attachment out of the coupler.

MAINTENANCE AND REPAIR INSTRUCTIONS

WARNING: To prevent serious injury, never perform maintenance or repairs with unit running.
Always service and repair a cool unit. Disconnect the spark plug wire to ensure that the unit cannot start.

MAINTENANCE SCHEDULE
Perform these required maintenance procedures at the frequency stated in the table. These procedures should also be a part of any seasonal tune-up.

NOTE: Some maintenance procedures may require special tools or skills. If you are unsure about these procedures take your unit to a Sears or other qualified service dealer.
NOTE: Maintenance, replacement, or repair of the emission control devices and system may be performed by a Sears or other qualified service dealer.

In order to assure peak performance of your engine, inspection of the engine exhaust port may be necessary after 50 hours of operation. If you notice lost RPM, poor performance or general lack of acceleration, this service may be required. If you feel your engine is in need of this inspection, refer service to a Sears or other qualified service dealer for repair.
DO NOT attempt to perform this process yourself as engine damage may result from contaminants involved in the cleaning process for the port.

p. 10
Every 10 hours| Clean and re-oil air filter| p. 11
1st change at 10 hours
2nd change at 25 hours
Every 25 hours after| Change oil
Change oil
Clean spark arrestor| p. 10
p. 10
p. 13
10 hours on new engine
Every 25 hours
Every 25 hours| Check rocker arm to valve clearance and adjust
Check rocker arm to valve clearance and adjust
Check spark plug condition and gap| p. 12
p. 12
p. 13

CHECKING THE OIL LEVEL
The importance of checking and maintaining the proper oil level in the crankcase cannot be overemphasized. Check oil before each use:

1. Stop the engine and allow oil to drain into the crankcase.

2. Place the engine on an elevated, level surface with the cutting head shield hanging off the surface to get a proper oil level reading (Fig. 18).

3. Keep dirt, grass clippings and other debris out of the engine.
   Clean the area around the dipstick before removing it.

4. Remove the oil fill plug.

5. Look into the oil fill hole, use a flashlight if needed. The oil should be just touching the inner most thread (Fig. 19).

6. If the oil level is not touching the inner most thread on the oil fill hole, add a small amount of oil to the oil fill hole and recheck (Fig. 19). Repeat this procedure until the oil level reaches the inner most thread on the oil fill hole.

NOTE: Do not overfill the unit.
NOTE: Make sure the O-ring is in place on the oil fill plug when checking and changing the oil (Fig. 20).

CHANGING THE OIL
WARNING: Wear gloves to prevent injury when handling unit.
For a new engine, change the oil after the first 10 hours of operation. Change the oil while the engine is still warm. The oil will flow freely and carry away more impurities.

1. Unplug spark plug boot to prevent accidental starting.

2. Remove the oil fill plug.

3. Pour the oil out of the oil fill hole and into a container by tipping the unit to a vertical position (Fig. 21).
   Allow ample time for complete drainage.

4. Wipe up any oil residue on the unit and clean up any oil that may have spilled. Dispose of the oil according to Federal, State and local regulations.

5. Refill the crankcase with 3.04 fluid ounce (90 ml) or 3/8 cup of SAE 30 SF, SG, SH oil. NOTE: Use the bottle and spout saved from initial use to measure the correct amount of oil. The top of the label on the bottle measures approximately 3.04 ounces (90 ml) or 3/8 cup (Fig. 22). Check the level, See Checking the Oil Level. If the level is low, add a small amount of oil and recheck. Do not overfill (Fig. 22).

6. Replace the oil fill plug.

7. Reconnect the spark plug boot.

AIR FILTER MAINTENANCE

WARNING: To avoid serious personal injury, always turn the unit off and allow it to cool before you clean or service it.

Cleaning the Air Filter
Clean and re-oil the air filter every 10 hours of operation. It is an important item to maintain. Failure to maintain your air filter properly can result in poor performance or can cause permanent damage to your engine.

1. Open the air filter cover. Push the tab on the under side of the cover inward. Then pull the air filter cover out and up. (Fig. 23).

2. Remove the air filter (Fig. 23).

3. Wash the filter in detergent and water (Fig. 24). Rinse the filter thoroughly and allow it to dry.

4. Apply enough clean SAE 30 motor oil to lightly coat the filter (Fig. 25).

5. Squeeze the filter to spread and remove excess oil (Fig. 26).

6. Replace the filter (Fig. 23).
   NOTE: If the unit is operated without the air filter, you will VOID the warranty.

7. Reinstall the air filter cover. Position the slots on the top of the air filter cover onto the tabs at the top of the back plate (Fig. 27).

8. Swing the cover down until the tab on the air filter backplate snaps into place in the slot on the air filter cover (Fig. 28).

CARBURETOR ADJUSTMENT
The idle speed of the engine is adjustable. An idle adjustment screw is between the air filter cover and the engine starter housing (Fig. 29).

NOTE: Careless adjustments can seriously damage your unit. A Sears or other qualified service dealer should make carburetor adjustments.

Check Fuel

Old fuel is usually the reason for improper unit performance.
Drain and refill the tank with fresh fuel prior to making any adjustments. Refer to Oil and Fuel Information.

Clean Air Filter
The condition of the air filter is important to the operation of the unit. A dirty air filter will restrict air flow. This is often mistaken for an out of adjustment carburetor. Check the condition of the air filter before adjusting the idle speed screw.
Refer to Air Filter Maintenance.

Adjust Idle Speed Screw
WARNING: To prevent serious personal injury, make sure the cutting attachment has stopped rotating before you turn it off and set it down.
If, after checking the fuel and cleaning the air filter, the engine still will not idle, adjust the idle speed screw as follows:

1. Start the engine and let it run at a high idle for a minute to warm up. Refer to Starting/Stopping Instructions.

2. Release the throttle trigger and let the engine idle. If the engine stops, insert a small phillips screwdriver in between the Air Filter Cover and the Engine Cover (Fig. 29). Turn the idle speed screw in, clockwise, 1/8 of a turn at a time (as needed) until the engine idles smoothly.
   NOTE: The cutting attachment should not rotate when the engine idles.

3. If the cutting attachment rotates when the engine idles, turn the idle speed screw counterclockwise 1/8 of a turn at a time (as needed), until the attachment stops turning.

WARNING: The cutting attachment may spin during idle speed adjustments. Wear protective clothing and observe all safety instructions to prevent serious personal injury.
Checking the fuel, cleaning the air filter, and adjusting the idle speed should solve most engine problems. If not and all of the following are true:

• the engine will not idle
• the engine hesitates or stalls on acceleration
• there is a loss of engine power

Have the carburetor adjusted by a Sears or other qualified service dealer.

ROCKER ARM CLEARANCE
This requires disassembly of the engine. If you feel unsure or unqualified to perform this, take the unit to a Sears or other qualified service dealer

NOTE: Inspect the valve to rocker arm clearance with a feeler gauge after the first 10 hours of operation and every 25 hours of operation.

• The engine must be cold when checking or adjusting the valve clearance.
• This task should be performed inside, in a clean, dust free area.

1. Remove the six (6) screws on the back of the engine cover with a Flat-head or T-25 Torx screwdriver (Fig. 30).

2. Disconnect the spark plug wire.

3. Clean dirt from around the spark plug. Remove the spark plug from the cylinder head by turning a 5/8 in. socket counterclockwise.
   

4. Remove the engine cover (Fig. 30).

5. Clean dirt from around the rocker arm cover. Remove the screw holding the rocker arm cover with a large flat blade screwdriver or Torx T25 bit (Fig. 31). Remove the rocker arm cover and gasket.

6. Pull the starter rope slowly to bring the piston to the top of its travel, (known as top dead center). Check that:
   • The piston is at the top of its travel while looking in the spark plug hole (Fig. 32)
   • Both rocker arms move freely, and both valves are closed. If these statements are not true, repeat this step.

7. Slide the feeler gauge between the rocker arm and the valve return spring. Measure the clearance between the valve stem and rocker arm (Fig. 32 & 33). Measure both the intake and exhaust valves.The recommended clearance for both intake and exhaust is .003 – .006 in. (.076 – 0.152 mm). Use a standard automotive .005 in. (0.127 mm) feeler gauge. The feeler gauge should slide between the rocker arm and valve stem with a slight amount of resistance, without binding. See Figures 31 and 32.

8. If the clearance is not within specification:
   a. Turn the adjusting nut using a 5/16 inch (8 mm) wrench or nut driver (Fig. 33).
   • To increase clearance, turn the adjusting nut counterclockwise.
   • To decrease clearance, turn the adjusting nut clockwise.
   b. Recheck both clearances, and adjust as necessary.

9. Reinstall the rocker arm cover using a new gasket. Torque the screw to 20–30 in•lb (2.2–3.4 N•m).

10. Check the spark plug and reinstall. See Replacing the Spark Plug.

11. Replace the spark plug wire.

12. Reinstall the engine cover. Check alignment of the cover before tightening the screws. Tighten screws.

REPLACING THE SPARK PLUG
Use a replacement part number 753-05255 or Champion spark plug, #RDZ19H. The correct air gap is 0.025 in. (0.635 mm).
Remove the plug after every 25 hours of operation and check its condition.

1. Stop the engine and allow it to cool. Remove the six (6) screws on the back of the engine cover with a Flathead or T-25 Torx screwdriver (Fig. 30).
2. Grasp the plug wire firmly and pull the cap from the spark plug.
3. Clean dirt from around the spark plug. Remove the spark plug from the cylinder head by turning a 5/8 in. socket counterclockwise.
4. Replace cracked, fouled or dirty spark plug. Set the air gap at 0.025 in. (0.635 mm) using a feeler gauge (Fig. 34).
5. Install a correctly-gapped spark plug in the cylinder head. Turn the 5/8 in. socket clockwise until snug.

WARNING: Do not sand blast, scrape or clean electrodes. Grit in the engine could damage the cylinder.

If using a torque wrench torque to: 110-120 in.•lb. (12.3-13.5 N•m)
Do not over tighten.

SPARK ARRESTOR MAINTENANCE

1. Remove the rear engine cover. See Rocker Arm Clearance.

2. With a flat blade screwdriver or Torx T-20 bit and a T-25 bit, remove the screws attaching the spark arrestor diverter to the muffler (Fig. 35).

3. Pull the the spark arrestor diverter out of the muffler.
   Remove the spark arrestor diverter.

4. Remove the spark arrestor screen from the spark arrestor diverter.
   WARNING: To avoid serious personal injury, always turn your unit off and allow it to cool before you clean or service it.

5. Clean the spark arrestor screen with a wire brush or replace it.

6. Reinstall the spark arrestor screen, spark arrestor diverter and screws.

CLEANING
Use a small brush to clean off the outside of the unit. Do not use strong detergents. Household cleaners that contain aromatic oils such as pine and lemon, and solvents such as kerosene, can damage plastic housing or handle. Wipe off any moisture with a soft cloth.

STORAGE

• Never store the unit with fuel in the tank where fumes may reach an open flame or spark.
• Allow the engine to cool before storing.
• Lock up the unit to prevent unauthorized use or damage.
• Store the unit in a dry, well-ventilated area.
•  Store the unit out of the reach of children.

LONG TERM STORAGE

1. Drain all gasoline from the gas tank into a container. Do not use gas that has been stored for more than 60 days. Dispose of the old gasoline in accordance to Federal, State, and Local regulations.

2. Start the engine and allow it to run until it stalls. This ensures that all gasoline has been drained from the carburetor.

3. Allow the engine to cool. Remove the spark plug and put 5 drops of high quality motor oil into the cylinder. Pull the starter rope slowly to distribute the oil. Reinstall the spark plug.
   NOTE: Remove the spark plug and drain all of the oil from the cylinder before attempting to start the trimmer after storage.

4. Change the oil, referring to Changing the Oil. Dispose of the old oil in accordance to Federal, State and Local regulations.

5. Thoroughly clean the unit and inspect for any loose or damaged parts. Repair or replace damaged parts and tighten loose screws, nuts or bolts. The unit is ready for storage.

TRANSPORTING

• Allow the engine to cool before transporting.
• Secure the unit while transporting.
• Drain the gas tank before transporting.
• Tighten gas cap before transporting.

TROUBLESHOOTING

ENGINE WILL NOT START

CAUSE
Empty fuel tank
Primer bulb wasn’t pressed enough
Old fuel
Fouled spark plug
Plugged spark arrestor| ACTION
Fill fuel tank with new fuel
Press primer bulb fully and slowly 10 times
Drain gas tank and add fresh fuel
Replace the spark plug
Clean or replace spark arrestor
---|---

ENGINE WILL NOT IDLE

CAUSE
Air filter is plugged
Old fuel
Improper carburetor adjustment| ACTION
Replace or clean the air filter
Drain gas tank and add fresh fuel
Adjust carburetor
---|---

ENGINE WILL NOT ACCELERATE

CAUSE
Old fuel
Improper carburetor adjustment
Cutting attachment bound with grass
Dirty air filter
Plugged spark arrestor| ACTION
Drain gas tank and add fresh fuel
Take to a Sears or other qualified service dealer for adjustment
Stop the engine and clean the cutting attachment
Clean or replace the air filter
Clean or replace spark arrestor
---|---

ENGINE LACKS POWER OR STALLS WHEN CUTTING

CAUSE
Old fuel
Improper carburetor adjustment
Fouled spark plug
Plugged spark arrestor| ACTION
Drain gas tank and add fresh fuel
Take to a Sears or other qualified service dealer for adjustment
Replace the spark plug
Clean or replace spark arrestor
---|---

NOTE: For repairs beyond the minor adjustments listed above, contact your nearest Sears Parts & Repair center (1-800-4-MY-HOME®) or other qualified service dealer.

SPECIFICATIONS

Engine Type………………………………………………………………Air-Cooled, 4-Cycle
Displacement ………………………………………………………1.8 cu. in. (29 cc)
Operating RPM ………………………………………………………. 6,800+ rpm
Idle Speed RPM……………………………………………………….2,800 – 3,600 rpm
Ignition Type ………………………………………………………….Electronic MAX FIRE IGNITION™
Ignition Switch ……………………………………………………………. Rocker Switch
Valve clearance ………………………………………………………….. 0.003–0.006 in. (0.076–0.152 mm)
Spark Plug ………………………………………………………..Champion Spark Plug #RDZ19H or Similar Spark Plug
Spark Plug Gap ……………………………………………….. 0.025 inch (0.635 mm)
Lubrication ……………………………………………………….. SAE 30 Oil
Crankcase Oil Capacity …………………………………………. 3.04 oz (90 ml) or approx. 3/8 cup
Fuel ………………………………………………………………..Unleaded
Carburetor ………………………………………………………… Diaphragm, All-Position
Starter………………………………………………………………. IncrediPull™ Starting Auto Rewind
Muffler ……………………………………………………………..Baffled with Guard
Throttle …………………………………………………………… Manual Spring Return
Fuel Tank Capacity ………………………………………………. 14 oz (414 ml)

**DRIVE SHAFT AND CUTTING ATTACHMENT***
Drive Shaft Housing……………………………… Steel Tube (Craftsman Convertible™)
Throttle Control……………………………………………. Finger-Tip Trigger
Approximate Unit Weight (No fuel, with Hassle Free™, shield & D-handle)……………………………… 11.5-13.0 lbs (5.2-5.9 kg)
Cutting Mechanism ………………………………….. HassleFree™ Head
Timming Line Diameter ……………………………………………………… Hassle Free™ XRTA QUIET Spiral Line

*All specifications are based on the latest product information available at the time of printing. We reserve the right to make changes at any time without notice.

Repair Protection Agreements
Congratulations on making a smart purchase. Your new Craftsman® product is designed and manufactured for years of dependable operation.
But like all products, it may require repair from time to time.
That’s when having a Repair Protection Agreement can save you money and aggravation.
Purchase a Repair Protection Agreement now and protect yourself from unexpected hassle and expense.
Here’s what’s included in the Agreement:

• Expert service by our 12,000 professional repair specialists
• Unlimited service and no charge for parts and labor on all covered repairs
• Product replacement if your covered product can’t be fixed
• Discount of 10% from regular price of service and servicerelated parts not covered by the agreement; also, 10% off regular price of preventive maintenance check
• Fast help by phone – phone support from a Sears technician on products requiring in-home repair, plus convenient repair scheduling

Once you purchase the Agreement, a simple phone call is all that it takes for you to schedule service. You can call anytime day or night, or schedule a service appointment online.
Sears has over 12,000 professional repair specialists, who have access to over 4.5 million quality parts and accessories. That’s the kind of professionalism you can count on to help prolong the life of your new purchase for years to come. Purchase your Repair Protection Agreement today!
Some limitations and exclusions apply.
For prices and additional information call 1-800-827-6655.
Sears Installation Service
For Sears professional installation of home appliances, garage door openers, water heaters, and other major home items, in the U.S.A. call 1-800-4-MY-HOME®

NOTES….

PARTS LIST

REPLACEMENT PARTS – MODEL 316.796170
4-CYCLE GAS TRIMMER

REPLACEMENT PARTS – MODEL 316.796170
4-CYCLE GAS TRIMMER

Get it fixed, at your home or ours!
Your Home
For repair—in your home—of all major brand appliances, lawn and garden equipment, or heating and cooling systems, no matter who made it, no matter who sold it!
For the replacement parts, accessories and owner’s manuals that you need to do-it-yourself.
For Sears professional installation of home appliances and items like garage door openers and water heaters.
1–800–4–MY–HOME®
(1–800–469–4663)
Call anytime, day or night (U.S.A. and Canada)
www.sears.com www.sears.ca

Our Home

For repair of carry-in items like vacuums, lawn equipment, and electronics, call or go on-line for the location of your nearest

Sears Parts & Repair Center 
1–800–488–1222

Call any time, day or night (U.S.A. only)

www.sears.com

To purchase a protection agreement (U.S.A.)
or maintenance agreement (Canada) on a product serviced by Sears:
1–800–827–6655 (U.S.A.)
1–800–361–6665 (Canada)

® Registered Trademark / TM Trademark / SM Service Mark of Sears Brands, LLC

Sears, Roebuck and Co., Hoffman Estates, IL 60179, U.S.A.
Visit our website: www.sears.com/craftsman
769-02806
© Sears Brands, LLC

References

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