Ryobi Expand-it UT15520C - Manual (Page 12)

12
 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.
MAINTENANCE
BAR NUT
Fig. 15
CHAIN TENSIONING
SCREW
Fig. 14
IDLE SPEED SCREW
Fig. 16