TRIMMER ENGINE - IDLE SPEED ADJUSTMENT
See Figure 18.
If the chain turns at idle, the idle speed screw needs
adjusting on your trimmer engine. Turn the idle speed screw
counterclockwise to reduce the idle RPM and stop the chain
movement. If the saw chain still moves at idle speed, contact
a service dealer for adjustment and discontinue use until the
repair is made.
WARNING
The saw chain should never turn at idle. Turn the idle
speed screw “T” counterclockwise to reduce the idle
RPM and stop the chain, or contact a service dealer
for adjustment and discontinue use until the repair is
made. Serious personal injury may result from the saw
chain turning at idle.
CHAIN TENSION
WARNING
To avoid possible serious injury, never touch or adjust
the chain while the motor is running. The saw chain is
very sharp, always wear protective gloves when
performing maintenance to the chain.
1. Stop the engine before setting the chain tension. Make
sure the guide bar nut is loose to finger tight, turn the chain
tensioning screw clockwise to tension the chain. Refer to
“Replacing the Bar and Chain” for additional information.
A cold chain is correctly tensioned when there is no slack
on the underside of the guide bar, the chain is snug, but it
can be turned by hand without binding.
2. Chain must be re-tensioned whenever the flats on the drive
links hang out of the bar groove.
See Figure 19.
3. During normal operation, the temperature of the chain
will increase. The drive links of a correctly tensioned warm
chain will hang approximately .050 in. (1.25 mm) out of the
bar groove.
See Figure 20.
Note:
New chain tends to stretch; check chain tension
frequently and tension as required.
CAUTION
Chain tensioned while warm, may be too tight upon
cooling. Check the "cold tension" before next use.
CHAIN OILER
1. Use Premium Bar and Chain Oil. It is designed for chains
and chain oilers and is formulated to perform over a wide
temperature range with no dilution required.
2. Remove the cap (3) and carefully pour approximately 8 oz.
(237 cc) of the bar and chain oil into the chain oiler tank
(31).
See Figure 21.
3. Replace the cap and tighten securely.
4. Check and refill the chain oiler tank every time the engine
is fueled.
Note:
Do not use dirty, used or otherwise contaminated oils.
Damage may occur to the oil pump, bar, or chain.
CHAIN MAINTENANCE
Use only the replacement low kickback chain specified
for your unit.
For smooth and fast cutting, the chain needs to be
maintained properly. The chain requires sharpening when the
wood chips are small and powdery, the chain must be
forced through the wood during cutting, or the chain cuts
to one side. During maintenance of your chain, consider
the following:
■
Improper filing angle of the side plate can increase the
risk of a severe kickback.
■
Depth gauge (or raker clearance) setting (32) determines
the height the cutter enters the wood and the size of the
wood chip that is removed. Too much clearance increases
the potential for kickback. Too little clearance decreases the
size of the wood chip thus decreasing the chain's
cutting ability.
See Figure 22.
■
If cutter teeth have hit hard objects such as nails
and stones, or have been abraded by mud or sand on
the wood, have service dealer sharpen chain.
HOW TO SHARPEN THE CUTTERS
See Figure 23.
Be careful to file all cutters to the specified angles and to the
same length, as fast cutting can be obtained only when all
cutters are uniform.
1. Tighten the chain tension enough that the chain does
not wobble. Do all of your filing at the mid-point of the bar.
Wear gloves for protection.
2. Use a 5/32 in. (4.5 mm) diameter round file and holder.
3. Keep the file level with the top plate of the tooth. Do not let
the file dip or rock.
See Figure 24.
4. Using light but firm pressure, stroke towards the front
corner of the tooth. Lift file away from the steel on each
return stroke.
See Figure 25.
5. Put a few firm strokes on every tooth. File all left hand
cutters (42) in one direction. Then move to the other side
and file the right hand cutters (43) in the opposite direction.
Occasionally remove filings from the file with a wire brush.
See Figure 26.
CAUTION
Dull or improperly shar pened chain can cause
excessive engine speed during cutting which may
result in severe engine damage.
9
English
MAINTENANCE
