12
All pruner service, other than the items listed in the
instruction manual maintenance instructions, should be
carried out by a service centre.
CHAIN TENSION
See figures 10 - 11.
WARNING
To avoid possible serious injury, never touch or adjust
the chain while the engine is running. The saw chain
is very sharp; always wear protective gloves when
performing maintenance to the chain.
■
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.
NOTE:
A cold chain is correctly tensioned when there
is no slack on the underside of the guide bar. The cold
chain is snug and will hang approximately 4.0 mm (
0.160 in) out of the bar groove, as shown in figure 11 (
item 38), but it can be turned by hand without binding.
■
Chain must be re-tensioned whenever the flats (item
37) on the drive links hang out of the bar groove as
shown in figure 10.
■
The chain tension is correct when the gap is about 3
-4 mm. Since the chain will stretch when it heats up,
then it is recommended that the chain tension must be
checked regularly.
■
During normal operation, the temperature of the chain
will increase. The drive links of a correctly tensioned
warm chain will hang approximately 1.30 mm (.050 in)
out of the bar groove, as shown in figure 11 (item 38).
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.
REPLACING THE BAR AND CHAIN
See figures 12-15.
WARNING
To avoid possible serious injury, stop engine before
replacing the bar, chain, or performing any maintenance
operation.
■
Remove the bar nut (item 39) and drivecase cover
(item 40).
■
The bar contains a bar stud slot (item 43) that fits over
the bar stud (item 41). The bar also contains a chain
tensioning pin hole (item 44) which fits over the chain
tensioning pin.
■
Place the bar onto the bar stud so that the chain
tensioning pin fits into the chain tensioning pin hole.
■
Fit the chain over the sprocket and into the bar groove.
The cutters on the top of the bar should face toward
the bar tip, in the direction of the chain rotation.
■
Replace the drivecase cover and install the bar nut.
Tighten the bar nut finger tight only. The bar must be
free to move for tension adjustment.
■
Remove all slack from chain by turning the chain
tensioning screw (item 46) clockwise, assuring that
the chain seats into the bar groove during tensioning.
■
Lift the tip of the bar up to check for sag. Release the
tip of the bar, and turn the chain tensioning screw 1/2
turn clockwise. Repeat this process until sag does not
exist.
■
Hold the tip of the bar up and tighten the bar nut (item
39) securely.
■
The chain tension is correct when the gap is about 3
-4 mm. Since the chain will stretch when it heats up,
then it is recommended that the chain tension must be
checked regularly.
NOTE:
If chain is too tight, it will not rotate. Loosen
the bar nut slightly and turn adjusting screw 1/4 turn
counterclockwise. Lift the tip of the bar up and retighten
bar nut.
ADJUSTING THE IDLE SPEED
See figure 18.
If the chain turns at idle, the idle speed screw (item 47)
needs adjusting on the 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.
AUTOMATIC BAR AND CHAIN LUBRICATION
See figure 19.
■
Use a premium blend of Bar and Chain Lubricant. It is
designed for chains and chain oilers and is formulated
to perform over a wide temperature range with no
dilution required.
■
Remove the cap and carefully pour approximately 230
ml of bar and chain lubricant into the bar lube reservoir.
■
Replace the cap and tighten securely.
■
Check and refill the bar lube reservoir every time the
engine is fuelled.
NOTE:
Do not use dirty, used or otherwise contaminated
lubricant. Damage may occur to the oil pump, bar, or
chain.
