MAINTENANCE
Place the bar onto the bar stud so that the chain tension- ing 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 drive case cover and reinstall 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 tension- ing screw 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 securely.
Chain is correctly tensioned when there is no slack on the underside of the bar and the chain is snug, but can be turned by hand without binding.
NOTE: If chain is too tight, it will not rotate. Loosen the bar nut slightly and turn adjusting screw 1/4 turn coun- terclockwise. Lift the tip of the bar up and retighten bar nut.
WARNING:
Check the chain tension frequently when operating the unit. Never touch or adjust the chain while the engine is running. The chain is very sharp; always wear protective gloves when performing maintenance to the chain.
TRIMMER ENGINE IDLE SPEED
ADJUSTMENT
See Figure 16.
If the chain turns at idle, the idle speed screw needs adjust- ing on your trimmer engine. Turn the idle speed screw counterclockwise to reduce the idle RPM and stop the chain movement. If the chain still moves at idle speed, contact a service dealer for adjustment and discontinue use until the repair is made.
WARNING:
The 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 per- sonal injury may result from the chain turning at idle.
CHAIN TENSIONING
SCREW
Fig. 14
BAR NUT
Fig. 15
IDLE SPEED SCREW
Fig. 16
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