Ryobi RY43160 - Manual (Page 17)

Page 17 — English
NOTE: New chain tends to stretch; check chain
tension frequently and tension as required.
CAUTION:
Chain tensioned while warm, can be too tight
upon cooling. Check the “cold tension” before
next use.
REPLACING THE BAR AND CHAIN
See Figures 13 - 16.
WARNING:
To avoid possible serious injury, stop the mo-
tor and disconnect from power supply before
replacing the bar, chain, or performing any
maintenance operation.
 Remove the bar nut (7/16 in.) and drivecase
cover.
 The bar contains a bar stud slot that fits over the
bar stud. The bar also contains a chain tension-
ing pin hole 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 clockwise, assuring that the
chain seats into the bar groove during tension-
ing.
 Lift the tip of the bar up to check for sag. Re-
lease the tip of the bar, and turn the chain ten-
sioning 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, the chain is snug, but
it can be turned by hand without binding.
BAR
DRIVECASE
COVER
BAR NUT
CHAIN
Fig. 13
DRIVECASE
COVER
CHAIN
TENSIONING PIN
BAR
NUT
BAR STUD
SLOT
BAR
STUD
CHAIN
TENSIONING
PIN HOLE
BAR
SPROCKET
Fig. 14
CHAIN
TENSIONING SCREW
CHAIN
ROTATION
CHAIN
SPROCKET
Fig. 15
NOTE: If chain is too tight, it will not rotate. Loos-
en the bar nut slightly and turn adjusting screw
1/4 turn counterclockwise. Lift the tip of the bar
up and retighten bar nut.
MAINTENANCE