Ryobi RY43155 Operator's Manual page 28

ADJUSTING THE CHAIN TENSION
See Figures 33 - 34.
WARNING:
Stop the motor and disconnect from power
supply. Never touch or adjust the chain while the
motor is running. The saw chain is very sharp.
Always wear protective gloves when performing
maintenance on the chain. Failure to follow these
instructions can result in serious personal injury.
Proper chain tension is critical to the performance
of your chain saw. Always check chain tension
before using the saw and periodically until the
work is complete.
A cold chain is correctly tensioned when there is
no slack on the underside of the guide bar. The
chain should be snug, but still able to be turned
by hand without binding.
A warm chain is correctly tensioned when the flats
on the tie straps hang approximately .050 inches
out of the bar groove. The tip of the combination
wrench provided is approximately this size and
can be used to help determine if a warm chain is
correctly tensioned.
If adjustment is needed:
 Stop the motor and disconnect from power
supply.
 Slightly loosen the chain cover lock knob.
 Raise the tip of the guide bar and continue to
hold up until the end of this procedure.
 Turn the chain tension adjustment ring clockwise
until the flats on the tie straps of the chain
contact the bar, making sure the drive links are
seated inside the bar groove.
MAINTENANCE
 Rotate the chain cover lock knob clockwise to
secure.
 Release the tip of the guide bar and verify the
chain is now correctly tensioned using the
guidelines above.
NOTE: If the chain is too tight and will not rotate,
loosen the chain cover lock knob slightly, then
turn the chain tension adjustment ring 1/4 turn
counterclockwise. Lift up the tip of the guide bar,
retighten the chain cover lock knob securely,
then verify the chain will now rotate without
binding.
NOTE: New chains tend to stretch; check the chain
tension frequently and adjust as needed.
NOTICE:
A chain tensioned while warm may be too tight
upon cooling. Check the "cold tension" before
next use.
Page 28 — English
FLATS ON TIE STRAPS
≈
.050 in.
Fig. 33
Fig. 34