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- User Manual - (English, Spanish)
- KNOW YOUR UNIT
- ESSENTIAL TERMS AND DEFINITIONS
- ASSEMBLY
- OIL AND FUEL
- STARTING AND STOPPING
- OPERATION
- MAINTENANCE
- CLEANING AND STORAGE
- TROUBLESHOOTING
Table of contents
User Manual
KNOW YOUR UNIT
APPLICATIONS
- Felling and limbing trees
- Cutting logs (bucking)
- Pruning trees
ASSEMBLY TOOLS REQUIRED:
- Flat-head screwdriver or multi-purpose tool (provided)
ESSENTIAL TERMS AND DEFINITIONS
- CHAIN SAW - A tool designed to cut wood with a saw chain. A chain saw is an integrated unit comprised of a power source, saw chain, guide bar, and handles that are designed to be held by two hands during operation.
- CHAIN SAW POWERHEAD - A chain saw without the saw chain and guide bar.
- DRIVE SPROCKET - A toothed wheel that drives the saw chain.
- FRONT HANDLE - A support handle located toward the front of the chain saw.
- REAR HANDLE - A support handle located toward the rear of the chain saw.
- CHAIN BRAKE LEVER / FRONT HAND GUARD - A structural barrier between the front handle and the guide bar. The front hand guard helps protect the operator’s left hand if it slips off the front handle while the unit is running. The chain brake lever is also used to manually engage the chain brake.
- CHAIN BRAKE - A device that reduces the chance of injury if kickback occurs, by stopping the saw chain in milliseconds. The chain brake is designed to engage automatically in response to kickback. The chain brake can also be activated by pushing the chain brake lever forward, either intentionally or if the operator’s hand strikes the lever during kickback.
- REAR HAND GUARD - A structural barrier below the rear handle. The rear hand guard helps protect the operator’s right hand if the saw chain breaks or disengages from the guide bar during operation.
- GUIDE BAR - A solid railed structure that supports and guides the saw chain.
- GUIDE BAR TIP - The tip or end of the guide bar.
- REDUCED-KICKBACK GUIDE BAR - A guide bar that has been demonstrated to reduce kickback significantly.
- SAW CHAIN - A loop of chain with teeth designed to cut wood, which is driven by the engine and is supported by the guide bar. The saw chain is composed of drive links, cutters and side links, held together by rivets.
- LOW-KICKBACK SAW CHAIN - A saw chain that complies with the kickback performance requirements of ANSI/OPEI B175.1-2012 when tested on a representative sample of chain saws. Low-kickback saw chain significantly reduces the chance of kickback and the intensity of kickback, due to specially designed depth gauges and guard links.
- REPLACEMENT SAW CHAIN - A saw chain that complies with the kickback performance requirements of ANSI/OPEI B175.1-2012 when tested with specific chain saws. It may not meet the ANSI/OPEI performance standards when used with other chain saws.
- SPIKED BUMPER - The pointed tooth (or teeth), at the front of the chain saw, used during felling and bucking to help pivot the saw and maintain a stable position while cutting.
- CHAIN CATCHER - A device designed to intercept a whipping chain. The chain catcher reduces the chance of injury if the saw chain breaks or disengages from the guide bar during operation.
- OILER CONTROL - A system for oiling the saw chain and guide bar.
- ON/OFF SWITCH - A device that immediately stops the engine when moved to the OFF position. The saw chain will then coast to a stop.
- The On/Off switch must be moved to the On position to start the engine.
- THROTTLE CONTROL - A device used in conjunction with the throttle lockout to accelerate the engine. Releasing the throttle control returns the engine to idle.
- THROTTLE LOCKOUT - A device that prevents accidental acceleration of the engine. The throttle control cannot be squeezed unless the throttle lockout is engaged.
- SPARK ARRESTER SCREEN - A device that retains carbon and other flammable particles over 0.023 inches (0.6mm) in size from the engine exhaust flow. Compliance with local, state and federal laws and/or regulations governing the use of a spark arrester screen is the user’s responsibility. Refer to Spark Arrestor Note in the Safety section for additional information.
- KICKBACK - A sudden backward and/or upward motion of the guide bar and saw chain. Kickback can occur if the upper portion of the guide bar tip touches an object while the saw chain is spinning (rotational kickback). Kickback can also occur if the wood closes in and pinches the saw chain inside the cut (linear kickback).
- ROTATIONAL KICKBACK - A sudden backward and upward motion of the guide bar and saw chain. Rotational kickback can occur if the upper portion of the guide bar tip touches an object while the saw chain is spinning. The guide bar and saw chain are then kicked up and back toward the operator in a lightning-fast reverse reaction.
- LINEAR KICKBACK (PINCH KICKBACK) - A sudden backward motion of the guide bar and saw chain. Linear (pinch) kickback can occur if the wood closes in and pinches the saw chain inside a cut. The saw is then sent straight back toward the operator.
- NORMAL CUTTING POSITION - The positions assumed while making bucking and felling cuts.
- FELLING - The process of cutting down a tree.
- NOTCHED UNDERCUT - The first cutting procedure in the tree felling process. A notch is cut on one side of the tree to direct its fall.
- FELLING BACK CUT - The final cut in the tree felling process. The felling back cut is made on the opposite side of the tree from the notched undercut.
- BUCKING - The process of cutting a felled tree or log into lengths.
- LIMBING - The process of removing branches from a fallen tree.
- PRUNING - The process of cutting limbs from a living tree.
ASSEMBLY
ADDING BAR AND CHAIN OIL: INITIAL USE
This unit comes from the factory with the chain oil reservoir empty. Fill the chain oil reservoir with bar and chain oil before starting or using the unit. Refer to Adding Bar and Chain Oil instructions in the Maintenance section.
ADJUSTING THE CHAIN TENSION: INITIAL USE
The saw chain must be properly tensioned before attempting to start or operate the unit. The saw chain may also require additional tensioning as the saw chain heats up during operation. Refer to Adjusting the Chain Tension instructions in the Maintenance section.
TESTING THE CHAIN BRAKE
WARNING: Always activate the chain brake slowly and deliberately. Keep the saw chain from touching anything. Do not let the chain saw tip forward.
IF... If the chain stops moving, the chain brake is working correctly. IF... If the chain does not stop moving, have the unit serviced by an authorized service dealer. 5. Stop the engine and return the chain brake to the disengaged position. Refer to Stopping Instructions in the Starting and Stopping section. |
OIL AND FUEL
OIL AND FUEL MIXING INSTRUCTIONS
The use of old and/or improperly mixed fuel is the most common cause of performance problems. Use only fresh, clean unleaded gasoline. Follow the instructions carefully for the proper gasoline/oil mixture.
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 make fuel and oil separate, forming acids when stored. ALWAYS use fresh fuel (less than 30 days old).
NOTE: Dispose of old fuel according to federal, state and local regulations.
Using Blended Fuels
If using a blended fuel:
- Always use the fresh fuel mix explained in this operator's manual
- Use the fuel additive STA-BIL® or an equivalent
- Always agitate the fuel mix before fueling the unit
CAUTION: DO NOT USE E85 FUEL IN THIS UNIT. It has been proven that fuel containing greater than 10% ethanol will likely damage this engine and void the warranty.
Using Fuel Additives
The container of 2-cycle oil provided with this unit includes a fuel additive to help inhibit corrosion and minimize gum deposits. Always use the brand of 2-cycle oil that came with this unit. If this is unavailable, use a 2-cycle oil designed for air-cooled engines and mix it with a fuel additive, such as STA-BIL Fuel Stabilizer or an equivalent. 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 fuel tank.
Mixing the Fuel
NOTE: This unit comes with a 3.2 oz. (95 ml) container of 2-cycle oil. To obtain the correct fuel mixture described below, pour the entire container into one gallon of unleaded gasoline.
CAUTION: For proper engine operation and maximum reliability, pay strict attention to the gasoline and oil mixing instructions on the 2-cycle oil container. Using improperly mixed fuel can severely damage the engine.
Thoroughly mix the proper ratio of unleaded gasoline with 2-cycle engine oil. Do not mix them directly in the unit’s fuel tank. Use a separate fuel can. Use a 40:1 gasoline/oil ratio. See the table below for specific gasoline and oil mixing ratios.
FUELING THE UNIT
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.
WARNING: Remove the fuel cap slowly to avoid injury from fuel spray. Never operate the unit without the fuel cap securely in place.
WARNING: Add fuel in a clean, well-ventilated outdoor area. Wipe up any spilled fuel immediately. Avoid creating a source of ignition for spilled fuel. Do not start the engine until fuel vapors dissipate.
- Position the unit with the fuel cap facing up.
- Slowly remove the fuel cap (Fig. 2).
- Place the fuel container spout into the fuel tank fill hole and fill the tank.
NOTE: Do not overfill the tank.
STARTING AND STOPPING
WARNING: Operate this unit only in a well-ventilated outdoor area. Carbon monoxide exhaust fumes can be lethal in a confined area.
WARNING: Avoid accidentally starting the unit. To avoid serious injury, the operator and the unit must be in a stable position when pulling the starter rope (Fig. 5).
WARNING: Never operate the unit without the guide bar and saw chain properly installed. Make sure the bar- retaining nuts are tight and the guide bar cover is securely assembled. Make sure the saw chain is properly tensioned. Refer to Adjusting the Chain Tension instructions in the Maintenance section.
WARNING: The saw chain will spin after the engine starts. Keep hands and feet clear of the saw chain and do not allow the saw chain to contact any object(s).
STARTING INSTRUCTIONS
Before Starting the Unit
- Mix gasoline with oil. Refer to Oil and Fuel Mixing Instructions.
- Fill the fuel tank. Refer to Fueling the Unit.
- Fill the chain oil reservoir with bar and chain oil. Refer to Adding Bar and Chain Oil in the Maintenance section.
- Make sure the chain brake is disengaged. Refer to Testing the Chain Brake in the Assembly section.
Starting the Unit
- Move the On/Off switch to the On position (Fig. 3).
- Slowly press and release the primer bulb 10 times (Fig. 4). If fuel cannot be seen in the primer bulb, press and release the primer bulb until fuel is visible.
- Pull the choke knob out to Position 1 (Fig. 4).
NOTE: DO NOT touch the throttle control (Fig. 3) until step 10.
WARNING: The saw chain should not move when the engine runs at idle. If it does move, refer to Adjusting the Idle Speed in the Maintenance section.
11. To reduce the chance of injury, engage the chain brake until you are ready to begin operation. When ready, disengage the chain brake. Then press the throttle lockout and squeeze the throttle control to accelerate the engine, as needed.
NOTE: The engine is properly warmed up when it accelerates without hesitation.
IF... the engine hesitates, continue the warm-up.
IF... the engine does not start, repeat the starting procedure.
IF... the engine fails to start after a few attempts, move the choke knob to Position 2, press the throttle lockout and squeeze the throttle control. Pull the starter rope with a controlled and steady motion until the unit starts.
IF... the engine is already warm, make sure the On/Off switch is in the On position, crouch in the starting position, pull the choke knob out to Position 1 and then push the choke knob back in to Position 2. Begin the starting procedure with step 8.
STOPPING INSTRUCTIONS
- Release the throttle control and allow the engine to idle.
- Move the On/Off switch to the Off (O) position (Fig. 3). Wait for the engine and saw chain to come to a complete stop.
Emergency Stopping
- Push the chain brake lever forward to engage the chain brake. Refer to Testing the Chain Brake in the Assembly section.
- Move the On/Off switch to the Off (O) position. Wait for the engine and saw chain to come to a complete stop.
OPERATION
WARNING: Always check the chain tension and adjust as necessary before beginning operation. Refer to Adjusting the Chain Tension in the Maintenance section.
WARNING: Make sure the chain oil reservoir is full before operation. Check the oil level constantly so that it does not drop below half full. Make sure the chain oil adjustment screw is set appropriately. Refer to Setting the Chain Oil Adjustment Screw in the Maintenance section. The saw chain must be continuously coated with oil to function properly.
WARNING: Always wear appropriate eye, hearing, hand, foot and body protection to reduce the risk of injury when operating this unit. Wear head protection. Use a full face shield when needed. Refer to the Safety section for appropriate safety equipment information.
TIPS FOR BEST RESULTS
- Follow all safety instructions. Refer to the Safety section.
- Only cut wood and materials made of wood. Do not attempt to cut sheet metal, plastics, masonry or any other non-wood materials.
- Practice cutting a few small logs before beginning a major cutting operation. First-time users should practice cutting logs on a sawhorse or cradle before undertaking other operations.
- Do not attempt to cut trees or logs with diameters larger than:
- 10 in. / 25.4 cm (S145 / CMXGSAMNN4214)
- 12 in. / 30.5 cm (S160 / CMXGSAMNN4216)
- 14 in. / 35.6 cm (S180 / CMXGSAMCX4218)
PREPARING THE WORK AREA
HOLDING THE UNIT WARNING: Always use the hand placements specified below whether the operator is left-handed or right-handed. This will help keep the operator slightly to the left of the unit and out of the direct line of the saw chain if kickback occurs (Fig. 8 and Fig. 9). Always keep all body parts to the left of the chain line.
CUTTING PROCEDURE BASICS
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FELLING: SAFETY Felling is the process of cutting down a tree. Follow these safety precautions to reduce the risk of serious injury, property damage and damage to electrical lines:
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FELLING: PROCEDURE Small trees, up to 6 - 7 inches (15 - 18 cm) in diameter, are usually felled in a single cut. Larger trees require a sequence of two cutting operations: a notched undercut followed by a felling back cut. It may also be necessary to remove buttress roots. Step 1: Removing Buttress Roots Buttress roots are large roots that extend above the ground and help support the tree. If the tree has large buttress roots that might impede the felling process, follow these steps to remove them:
Step 2: Making the Notched Undercut WARNING: Never walk in front of a tree with a notched undercut. This cut determines which direction the tree will fall. Always make this cut on the side of the tree facing the direction where the tree should fall. Make the cut at 90o to the line of fall.
Step 3: Making the Felling Back Cut WARNING: Always recheck the area for bystanders, animals and obstacles before making the felling back cut. This cut fells the tree.
DANGER: If the tree starts to fall in the wrong direction and binds the chain saw, leave the unit and evacuate the area immediately! Do not try to save the chain saw! LIMBING Limbing is the process of removing branches from a fallen tree.
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BUCKING: SAFETY Bucking is the process of cutting a fallen tree into logs of desired lengths. Follow these safety precautions to reduce the risk of serious injury:
DANGER: Use extreme caution when cutting a fallen tree that is still attached to the root structure. When the trunk is separated from the roots, the stump has a high potential for rocking back into the hole created by the roots. This can result in serious injury or death. Never stand in the hole left by the roots. Never allow others to stand near the root structure. BUCKING: PROCEDURE Cutting Logs Under Stress When logs are supported on one or both ends, the wood tends to bend during the cutting process. This can cause the chain saw to become pinched between the two sides. Pay extra attention. 1. Make the first cut approximately 1/3 the diameter of the log. Do not cut deeper than 1/3.
2. Make the second cut from the opposite side until the two cuts meet. If the diameter of the wood is large enough, insert soft plastic or wooden wedges to hold the cut open and prevent pinching (Fig. 21). Take care not to touch the wedges with the saw chain. Cutting Fully-Supported Logs When logs are supported along the entire length, extra care should be taken to make sure the saw chain does not contact the ground or other support structure (Fig. 19).
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Overbucking
Underbucking
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PRUNING WARNING: Do not out above shoulder height with a chain saw. Use a pole saw to cut limbs above shoulder height or hire a professional. Do not operate the unit in a tree or on a ladder unless specifically trained to do so. WARNING: Falling branches can cause serious injury. Always wear appropriate head protection. Plan an escape route away from falling limbs. Do not position any body parts directly below the limb when cutting. Pruning is the process of cutting limbs from a living tree.
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MAINTENANCE
WARNING: To avoid serious personal injury, always stop the engine and allow it to cool before cleaning or maintaining the unit. Never perform cleaning or maintenance while the unit is running. Disconnect the spark plug wire to prevent the unit from starting accidentally.
WARNING: Wear protective clothing and observe all safety instructions to prevent serious personal injury.
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.
All service, other than the maintenance procedures described in this manual, should be performed by an authorized service dealer.
NOTE: Some maintenance procedures may require special tools or skills. If you are unsure about these procedures, take the unit to an authorized service dealer. Call 1-888-331-4569 for more information.
NOTE: Maintenance, replacement, or repair of the emission control devices and system may be performed by an authorized service dealer. Call 1-888-331-4569 for more information.
NOTE: Please read the California/EPA statement that came with the unit for a complete listing of terms and coverage for the emissions control devices, such as the spark arrestor, muffler, carburetor, etc.
CUSTOMER RESPONSIBILITY
Before each use
- Check for loose screws, nuts or bolts tighten as needed)
- Check for damaged or worn parts*
- Check the saw chain sharpness. Refer to
- Sharpening the Saw Chain.
- Test the chain brake*. Refer to Testing the
- Chain Brake.
- Check the chain tension (adjust as needed).
- Refer to Adjusting the Chain Tension.
- Fill the chain oil reservoir (refill frequently).
- Refer to Adding Bar and Chain Oil.
- Fill the fuel tank with fresh, properly mixed fuel. Refer to the Oil and Fuel section.
- Clean the air filter. Refer to Maintaining the Air Filter.
After each use
- Clean the unit and inspect decals. Refer to
- Cleaning in the Cleaning and Storage section.
Every 10 hours
- Check the spark plug condition and gap.
- Refer to Maintaining the Spark Plug.
- Clean the guide bar groove and oil passages. Lubricate the sprocket tip. Refer to Maintaining the Guide Bar.
- Clean the cylinder fins. Refer to Cleaning in the Cleaning and Storage section.
ADDING BAR AND CHAIN OIL
DANGER: Failure to fill the chain oil reservoir will cause irreparable damage to the unit. Make sure the chain oil reservoir is always filled. Always use bar and chain oil.
WARNING: Oil constantly flows from the chain oil reservoir to oil the saw chain. Check the chain oil level frequently so that it does not drop below half full.
The guide bar and saw chain require lubrication to minimize friction. Never starve the guide bar and chain of lubricating oil. Running the unit without enough oil will decrease cutting efficiency, shorten the life of the saw chain, cause rapid dulling of the saw chain and excessive wear to the guide bar from overheating. An insufficient amount of lubricating oil is evidenced by smoke, guide bar discoloration or pitch build-up.
Only use bar and chain oil that is formulated to perform over a wide range of temperatures with no diluting required in the chain oil reservoir. Do not use motor oil or any other petroleum-based oil. Do not use dirty, used or contaminated oil. Damage may occur to the guide bar or saw chain. Dispose of old oil according to federal, state and local regulations.
- Set the unit on a flat, level surface.
- To prevent debris from entering the chain oil reservoir, use a damp cloth to clean the chain oil cap and surrounding area.
- Unscrew the chain oil cap (Fig. 23).
- Carefully pour the oil into the chain oil reservoir. DO NOT overfill.
- Reinstall the chain oil cap. Tighten the cap firmly.
- Wipe up any oil that may have spilled.
ADJUSTING THE BAR AND CHAIN OIL FLOW
Bar and chain oil will slowly flow from the chain oil reservoir onto the chain. Approximately one tank of bar and chain oil is used for every tank of fuel.
- To increase the oil flow, turn the automatic oiler adjustment screw counterclockwise with a flat-head screwdriver (Fig. 24).
- To decrease the oil flow, turn the automatic oiler adjustment screw clockwise with a flat-head screwdriver (Fig. 24)
ADJUSTING THE CHAIN TENSION CAUTION: The guide bar, saw chain, and saw bearings will wear more rapidly if the saw chain is not properly tensioned. Maintaining proper chain tension will improve cutting performance and prolong the life of the saw chain. WARNING: To prevent serious injury, never touch the saw chain or adjust the chain tension while the unit is running. Disconnect the spark plug wire to prevent the unit from starting accidentally. WARNING: The saw chain is very sharp. Always wear heavy-duty protective gloves when handling or performing maintenance on the saw chain. Check the chain tension before and during operation. The saw chain will expand as it heats up during operation. Adjust the chain tension whenever the flats on the saw chain hang out of the bar groove (Fig. and Fig. 26). NOTE: A new saw chain tends to stretch and will need readjustment after as few as five (5) cuts. This is normal during the break-in period. The interval between future adjustments will lengthen quickly.
The saw chain should fit snuggly against the underside of the guide bar. There should be no sag (Fig. 26). 4. Continue to hold the guide bar tip up and move the saw chain back and forth along the guide bar (Fig. 28). Make sure the saw chain moves freely and is in proper mesh with the sprocket. If the saw chain does not move easily, slowly turn the chain- tensioning screw counterclockwise to loosen the saw chain. NOTE: The saw chain will not move if the chain brake is engaged. 5. Continue to hold the guide bar tip up and securely tighten the bar-retaining nuts. CAUTION: If the saw chain was tensioned while warm, it may become too tight when cooled. Loosen the chain tension after operation and check the chain tension before the next use. |
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REMOVING AND INSTALLING THE GUIDE BAR AND SAW CHAIN WARNING: The saw chain is very sharp. Always wear heavy-duty protective gloves when handling or performing maintenance on the saw chain. The guide bar and saw chain need to be removed when certain maintenance procedures are performed, such as when rotating the guide bar. When replacing old guide bars and saw chains with new parts, always use the manufacturer’s specified replacement parts. Refer to Replacing the Guide Bar and Saw Chain. Removing the Guide Bar and Saw Chain
Installing the Guide Bar and Saw Chain
MAINTAINING THE SAW CHAIN For safe, efficient operation, the saw chain must be maintained properly. The saw chain will wear with use, causing the chain to stretch. This is normal. When it is no longer possible to obtain a correct chain- tension adjustment, the saw chain will need to be repaired by an authorized service dealer or replaced. Refer to Replacing the Guide Bar and Saw Chain. Always keep the saw chain sharp. During operation, look for the following indicators of a dull saw chain:
If any of these conditions exist, sharpen or replace the saw chain. Refer to Sharpening the Saw Chain or Replacing the Guide Bar and Saw Chain. NOTE: If you do not fully understand the process for properly sharpening a saw chain after reading the instructions, have the saw chain sharpened by an authorized service center or replace the saw chain. |
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SHARPENING THE SAW CHAIN WARNING: The saw chain is very sharp. Always wear heavy-duty protective gloves when handling or performing maintenance on the saw chain. WARNING: An improperly sharpened saw chain increases the chance of kickback. Failure to replace or properly maintain the saw chain can cause serious injury. CAUTION: A dull or improperly sharpened saw chain can cause excessive engine speed during operation, which can result in severe engine damage. If the saw chain was damaged by contacting hard objects, such as nails or stones, or was abraded by mud or sand on the wood, have an authorized service dealer sharpen the saw chain. When sharpening the saw chain, file all cutters to the specified angles and measurements. Other angles or measurements can cause excessive wear to the guide bar and saw chain, cause the chain to dull quickly and increase the chance of kickback. Fast cutting can be obtained only when all cutters are uniform. 1. Tighten the chain tension so that the saw chain is taut and does not wobble. Refer to Adjusting the Chain Tension.
2. Use a round file and file holder (tools not included) to sharpen the top plate and side plate of each cutter.
3. Use a depth gauge tool (not included) to measure the depth gauge clearance (Fig. 36) of each cutter. The depth gauge clearance must be maintained at 1/32 inch (0.6 mm). The depth gauge clearance determines the depth at which the cutter enters the wood during operation and the size of the wood chips produced. Too much clearance increases the chance of kickback. Too little clearance decreases the size of the wood chips, thus deceasing the ability to cut.
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MAINTAINING THE GUIDE BAR
NOTE: If the oil passages are clear, the saw chain will give off a spray of oil shortly after it begins to rotate during operation. 3. Frequently check the guide bar for damage (Fig. 40). Feathering and burring of the guide bar rails (the ridges on either side of the bar groove) is a normal process of guide bar wear. Such faults should be smoothed with a file as soon as they occur (Fig. 40). A guide bar with the following faults should be replaced:
Refer to Replacing the Guide Bar and Saw Chain. Lubricating the Guide Bar Sprocket Tip The guide bar sprocket tip was lubricated at the factory, but requires regular lubrication. Failure to lubricate the guide bar sprocket tip will result in poor performance, damage to the unit and will VOID the warranty. NOTE: This procedure can be performed while the guide bar and saw chain are still assembled on the unit.
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REPLACING THE GUIDE BAR AND SAW CHAIN WARNING: Always use a low-kickback saw chain, which significantly reduces the danger of kickback. Low- kickback saw chain does not completely eliminate kickback. A low-kickback or “safety chain,” should never be regarded as total protection against injury. When replacing the guide bar and saw chain, only use the replacement parts specified by the manufacturer or their equivalents. Refer to Replacement Parts. Use of any unauthorized parts or accessories could lead to serious injury to the operator or damage to the unit and will VOID the warranty. Always use a replacement saw chain designated as “low-kickback” or a saw chain that meets the low-kickback performance requirements. A standard saw chain (a chain that does not have the kickback-reducing guard links) should only be used by an experienced professional chain saw operator. MAINTAINING THE AIR FILTER WARNING: To avoid serious personal injury, always stop the engine and allow it to cool before cleaning or maintaining the unit. Failure to maintain the air filter can result in poor performance or can cause permanent damage to the engine. Engine failure due to improper air filter maintenance is not covered by the product warranty. Cleaning the Air Filter
NOTE: Operating the unit without the air filter and air filter cover will VOID the warranty. Keep a supply of spare air filters. 6. Place the air filter cover back onto the unit. Insert the two tabs on the air filter cover into the two slots on the chain saw housing (Fig. 42).
7. Turn the knob clockwise to tighten the air filter cover securely.
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ADJUSTING THE IDLE SPEED WARNING: The saw chain may spin during idle speed adjustments. Wear protective clothing and observe all safety instructions to prevent serious personal injury. If the engine will not idle properly:
MAINTAINING THE SPARK PLUG
WARNING: Do not sand blast, scrape or clean spark plug electrodes. Grit in the engine could damage the cylinder. 6. Inspect the spark plug. If the spark plug is cracked, fouled or dirty, replace it with replacement part #794-00204, a Champion RZ7C or an equivalent spark plug.
7. Use a feeler gauge to set the air gap at 0.025 in. (0.635 mm) (Fig. 46).
8. Install the spark plug in the cylinder head. Tighten the spark plug with the multi-purpose tool or a 5/8-inch socket wrench, turning it clockwise until snug.
NOTE: If using a torque wrench, torque to: in.•lb. (12.3-13.5 N•m). Do not over tighten.
9. Reattach the spark plug boot.
10. Place the air filter cover back onto the unit. Insert the two tabs on the air filter cover into the two slots on the chain saw housing (Fig. 42).
11. Turn the knob clockwise to tighten the air filter cover securely.
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CLEANING AND STORAGE
CLEANING
WARNING: To avoid serious personal injury, always stop the engine and allow it to cool before cleaning or maintaining the unit.
- Loosen the saw chain if the chain tension was adjusted during operation. The saw chain will contract as the unit cools, which could damage the unit if the chain is too tight.
- Clean the unit with a damp cloth. Do not douse the unit with water. Do not use strong detergents. Household cleaners that contain aromatic oils such as pine and lemon, and solvents such as kerosene, can damage plastic. NOTE: When preparing the unit for long-term storage (30 days or more), remove the guide bar and saw chain. Carefully clean the guide bar cover, guide bar mounting surface and sprocket. Use a firm non-wire brush to clean the guide bar groove. Reassemble the unit.
- Wipe off any moisture with a soft cloth.
- Use compressed air, up to 40 PSI, to blow debris from the cylinder fins (Fig. 47). The cylinder fins must be cleaned on a regular basis to reduce the risk of personal injury or damage to the unit as a result of fire. Always use safety goggles/glasses when using compressed air. Do not use water or other liquids to clean the cylinder fins. Use a small wire brush to remove stubborn debris. If a significant amount of debris remains, have the unit cleaned by an authorized service dealer.
- Lightly coat the guide bar and saw chain with a corrosion- inhibiting oil.
STORAGE
- Loosen the saw chain if the chain tension was adjusted during operation. The saw chain will contract as the unit cools, which could damage the unit if the chain is too tight.
- Allow the engine to cool before storing.
- Thoroughly clean the unit and inspect it for any loose or damaged parts. Repair or replace damaged parts and tighten loose screws, nuts or bolts.
- Cover the guide bar and saw chain with the scabbard.
- Never store a fueled unit where fumes may reach an open flame or spark.
- 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.
NOTE: It is normal for bar and chain oil to seep from the unit when not in use. Please take this into consideration when storing the unit.
Long-term Storage (30 days or more)
- Remove the fuel cap, tip the unit and drain the fuel into an approved container. Reinstall the fuel cap.
- Start the engine and allow it to run until it stalls. This ensures that all fuel has been drained from the carburetor.
- Allow the engine to cool. Remove the spark plug and put 5 drops of any high-quality motor oil or 2-cycle oil into the cylinder. Pull the starter rope slowly to distribute the oil. Reinstall the spark plug.
Preparing the Unit for Use after Long-term Storage
- Remove the spark plug. Tip the unit and drain all of the oil from the cylinder into an approved container. Reinstall the spark plug.
NOTE: Do not use fuel that has been stored for more than 30 days. Dispose of old fuel and oil according to federal, state and local regulations.
TROUBLESHOOTING
THE ENGINE WILL NOT START
The fuel tank is empty
- Fill the fuel tank with properly-mixed fuel
The primer bulb was not pressed enough
- Press the primer bulb 10 times or until fuel is visible
The engine is flooded
- Move the choke knob to Position 2, press the throttle lockout, squeeze the throttle control and pull the starter rope
The fuel is old (over 30 days) and/or improperly mixed
- Drain the fuel tank and add fresh, properly-mixed fuel
The spark plug is not working properly
- Refer to Maintaining the Spark Plug
THE ENGINE WILL NOT IDLE
The air filter is dirty
- Clean or replace the air filter
The fuel is old (over 30 days) and/or improperly mixed
- Drain the fuel tank and add fresh, properly-mixed fuel
The idle speed is incorrect
- Adjust the idle speed
THE ENGINE WILL NOT ACCELERATE
The fuel is old (over 30 days) and/or improperly mixed
- Drain the fuel tank and add fresh, properly-mixed fuel
The air filter is dirty
- Clean or replace the air filter
THE ENGINE LACKS POWER OR STALLS
The fuel is old (over 30 days) and/or improperly mixed
- Drain the fuel tank and add fresh, properly-mixed fuel
The air filter is dirty
- Clean or replace the air filter
The spark plug is not working properly
- Refer to Maintaining the Spark Plug
THE SAW CHAIN COMES OFF THE GUIDE BAR
The saw chain tension is too loose
- Adjust the saw chain tension
The guide bar and saw chain are assembled incorrectly
- Refer to Removing and Installing the Guide Bar and Saw Chain
THE GUIDE BAR AND SAW CHAIN ARE RUNNING HOT, SMOKING OR STUCK
The saw chain tension is too tight
- Adjust the saw chain tension
The chain oil reservoir is empty
- Refill the chain oil reservoir
The guide bar groove and oil passages are dirty
- Clean the guide bar and oil passages
The automatic oiler flow is too low
- Increase the oil flow
THE SAW CHAIN DOES NOT ROTATE
The saw chain tension is too tight
- Adjust the saw chain tension
The guide bar and saw chain are assembled incorrectly
- Refer to Removing and Installing the Guide Bar and Saw Chain
The guide bar and saw chain are damaged
- Inspect the guide bar and saw chain for damage. Replace them if necessary
The drive assembly is damaged
- Refer to Service information
The chain brake is engaged
- Disengage the chain brake
THE SAW CHAIN ROTATES, BUT DOES NOT CUT
The saw chain is dull
- Sharpen or replace the saw chain
The saw chain is on backwards
- Check and correct the saw chain direction
See other models: CMXGSAMNN4214 CMXGNAM1130050 CMXGNAM1130054 CMXGNAM1130046 CMXGRAM7821291