maintenance
nReplace the outer guide bar plate ensuring that the bar pin groove is at the bottom with the upper and lower edges angled away from the guide bar.
nReplace the clutch cover and bar mounting nuts.
n
nRemove all slack from the chain by turning the chain tensioning screw clockwise until the chain seats snugly against the bar with the drive links in the bar groove.
nLift the tip of the guide bar up to check for sag.
nRelease the tip of the guide bar and turn the chain tension- ing screw 1/2 turn clockwise. Repeat this process until sag does not exist.
nHold the tip of the guide bar up and tighten the bar mount- ing nuts securely.
The chain is correctly tensioned when there is no sag on the underside of the guide bar, the chain is snug, but it can be turned by hand without binding. Ensure that the chain brake is not set.
Note: If chain is too tight, it will not rotate. Loosen the bar nuts slightly and turn the tension adjuster 1/4 turn counter- clockwise. Lift the tip of the guide bar up and retighten the bar nuts securely. Ensure that the chain will rotate without binding.
ADJUSTING THE CHAIN TENSION
See Figures 45 - 47.
WARNING:
Never touch or adjust the chain while the motor is run- ning. The saw chain is very sharp. Always wear protective gloves when performing maintenance on the chain.
nStop the engine before setting the chain tension.
nMake sure the bar mounting nuts are loosened to finger tight.
nTurn the chain tensioning screw clockwise to tension the chain.
Note: A cold chain is correctly tensioned when there is no slack on the underside of the guide bar, the chain is snug, and it can be turned by hand without binding.
Fig. 42
Fig. 43
Fig. 44
FLATS ON DRIVE LINKS
Fig. 45
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