CAUSE
SOLUTION
The carburetor mixture adjustment setting is incorrect
Have the carburetor adjusted by an authorized service
center
The fuel mixture is incorrect
Drain the fuel tank and add fresh, properly mixed fuel
CAUSE
SOLUTION
The spark plug is incorrectly gapped
Clean, gap or replace the spark plug
The spark arrestor screen is plugged
Clean the spark arrestor screen
The air filter is dirty
Clean or replace the air filter
CAUSE
SOLUTION
The carburetor mixture adjustment setting is incorrect
Have the carburetor adjusted by an authorized service
center
The fuel is old and/or improperly mixed
Drain the fuel tank and add fresh, properly mixed fuel
The air filter is plugged
Clean or replace the air filter
The spark plug is fouled
Clean, gap or replace the spark plug
CAUSE
SOLUTION
The carburetor mixture adjustment setting is incorrect
Have the carburetor adjusted by an authorized service
center
The air filter is plugged
Clean or replace the air filter
The fuel is old and/or improperly mixed
Drain the fuel tank and add fresh, properly mixed fuel
THE ENGINE HESITATES
CAUSE
SOLUTION
The unit was started incorrectly
Follow all
Starting and Stopping Instructions
The carburetor mixture adjustment setting is incorrect
Have the carburetor adjusted by an authorized service
center
The spark plug is fouled
Clean, gap or replace the spark plug
The fuel tank is empty
Fill the fuel tank with properly mixed fuel
The primer bulb was not pressed enough
Press the primer bulb fully and slowly 10 times
CAUSE
SOLUTION
The fuel filter is plugged
Replace the fuel filter
The choke lever is in the wrong position
Move the choke lever to Position 3
The spark arrestor screen is dirty
Clean the spark arrestor screen
The air filter is dirty
Clean the air filter
The carburetor mixture adjustment setting is incorrect
Have the carburetor adjusted by an authorized service
center
8
CLEANING INSTRUCTIONS
1. Stop the engine and wait for all moving parts to stop.
2. Allow the unit to cool.
3. Slacken the chain if it was retensioned at operating temperature
during cutting work. The chain contracts as it cools down. If it is
not slackened, it may damage the gearbox and bearings.
4. Wipe the unit down with a damp cloth. Do not douse the unit with
water. Do not use solvents or strong detergents. If preparing the
unit for long-term storage (three months or more), remove the
chain and guide bar, then clean the unit thoroughly with a damp
cloth. A firm-bristled, non-wire, brush can be used to remove
debris from the bar groove and assembly. When finished,
reassemble the unit. Refer to
Removing/Replacing the Guide Bar
and Chain
.
5. Debris must be removed from the cylinder fins on a regular basis to reduce the risk of damage to the unit and
personal injury from fire. Use compressed air, at 40 PSI or lower, to blow debris from the cylinder fins (Fig. 55).
Always wear safety goggles/glasses when cleaning the cylinder fins with compressed air. Use a small wire brush to
dislodge stubborn debris. Do not use water or solvents on the cylinder fins. If there is a significant amount of debris
that remains after cleaning, have the cylinder fins cleaned by an authorized service dealer.
6. Spray the guide bar and chain with corrosion inhibiting oil.
STORAGE INSTRUCTIONS
NOTE:
It is normal for oil to seep from the unit when it is not in use. Please take this into consideration when storing
the unit.
1. Follow the
Cleaning Instructions
listed above.
2. Attach the scabbard to the guide bar and chain.
3. Store the unit in a dry, high and/or locked location, out of the reach of children and other unauthorized persons.
Always store the unit and fuel in a cool, well-ventilated space where fuel vapors cannot reach sparks or open
flames from water heaters, electric motors or switches, furnaces, etc. Never store the unit, with fuel in the tank,
inside a building where fumes may reach an open flame or spark.
Long-term Storage Instructions
In addition to the standard storage instructions described above,
perform the following steps when storing the unit for 30 days or more:
1. Drain the fuel tank by running the unit dry. Alternatively, tip the
engine housing/fuel tank over to pour the fuel mixture into a
suitable container and then run the engine until it stops in order to
remove fuel from the carburetor.
2. Allow the engine to cool.
3. Remove the spark plug. Refer to
Inspecting/Adjusting/Replacing
the Spark Plug
.
4. Pour 1 teaspoon or clean 2-cycle oil into the combustion chamber
(Fig. 56). Pull the starter rope slowly several times to coat the
internal components.
5. Replace the spark plug.
Removing a Unit From Long-term Storage
1. Remove the spark plug.
2. Pull the starter rope briskly to clear excess oil from the combustion chamber.
3. Clean and gap, or replace, the spark plug.
4. Prepare the unit for operation.
WARNING:
Do not let brake fluids, gasoline, petroleum-based products, penetrating oils, etc., come
in contact with plastic parts. These chemicals may damage, weaken and destroy plastic, which may
result in serious personal injury.
SPECIFICATIONS
CHAIN SAW*
*
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.
Engine Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air-Cooled, 2-Cycle
Displacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 cc (3.36 cu in)
Idle Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,800 rpm
Operating Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8,500 rpm
Ignition Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electronic
Ignition Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Slide Switch
Starter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . AST Starting Auto Rewind
Throttle Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Finger-Tip Trigger
Throttle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Manual Spring Return
Spark Plug Gap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.025 in (0.635 mm)
Carburetor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diaphragm, All-Position
Muffler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Baffled with Guard
Drive Sprocket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-Tooth
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bar and Chain Oil
Bar Lube Reservoir Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.8 fl oz (201 ml)
Fuel/Oil Ratio. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40:1
Fuel Tank Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.8 fl oz (496.8 ml)
Cutting Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 in (91.4 cm)
Bar Length . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 in (50.8 cm)
Chain Pitch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3/8 in (9.5 mm)
Chain Gauge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.05 in (1.27 mm)
Approximate Unit Weight (no fuel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17.5 lbs (7.9 kg)
CLEANING AND STORAGE
CAUSE
SOLUTION
The chain is dull
Sharpen the chain
The chain is on backwards
Reverse the direction of the chain
TROUBLESHOOTING
NOTE:
For repairs beyond the minor adjustments listed above, locate your nearest authorized service center by
calling the Customer Support Department at
1-800-800-7310
(U.S.) or
1-800-668-1238
(Canada).
CAUSE
SOLUTION
The chain tension is too tight
Adjust the chain tension
The bar lube reservoir is empty
Refill the bar lube reservoir
The guide bar groove and/or oil passages are dirty
Clean the guide bar groove and oil passages
The oil flow from the automatic oiler to low
Increase the oil flow from the automatic oiler
CAUSE
SOLUTION
The chain tension is too tight
Adjust the chain tension
The guide bar and chain are assembled incorrectly
Refer to
Removing/Replacing the Guide Bar and Chain
The guide bar and chain are damaged
Inspect the guide bar and chain for damage
The drive assembly is damaged
Refer to
Service Information
The chain brake is engaged
Disengage the chain brake
THE CHAIN DOES NOT ROTATE WHILE THE ENGINE IS RUNNING
THE CHAIN ROTATES, BUT DOES NOT CUT
REPLACEMENT PARTS
Description
20-inch Chain
20-inch Guide Bar
Bar Lube Reservoir Cap
Bar-retaining Nuts
8 oz Bar and Chain Oil
Part #
753-06267 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
753-06266 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
753-06270 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
753-06271 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
753-06272 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
THE GUIDE BAR AND CHAIN ARE RUNNING HOT AND SMOKING OR STUCK
THE UNIT STARTS, BUT THE ENGINE HAS LOW POWER
THE UNIT WILL NOT START OR STARTS BUT DOES NOT CONTINUE TO RUN
THERE IS NO POWER WHEN THE UNIT IS UNDER LOAD
THE ENGINE RUNS ERRATICALLY
THE ENGINE SMOKES EXCESSIVELY
Fig. 56
Fig. 55
Cylinder Fins
