Ryobi RY52504, Operator'S Manual

Page: 15 / 24

15
MAINTENANCE
REPLACINg THE BAR AND CHAIN
See Figures 15 - 20.
WARNINg:
To avoid possible serious injury, stop engine before re-
placing the bar, chain, or performing any maintenance
operation.
 Remove the bar nut and drivecase cover.

The bar contains a bar stud slot that fits over the bar stud.
The bar also contains a chain tensioning pin hole which
fits over the chain tensioning pin.

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 drivecase cover and install the bar nut.
Tighten the bar nut finger tight only. The bar must be free
to move for tension adjustment.
CHAIN
TENSIONING SCREw
Fig. 19
BAR NUT
Fig. 0

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/ 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.
NOTE: If chain is too tight, it will not rotate. Loosen the
bar nut slightly and turn adjusting screw 1/4 turn counter-
clockwise. Lift the tip of the bar up and retighten bar nut.
CHAIN
ROTATION
BAR NUT
CHAIN
SPROCKET
Fig. 18
BAR DRIVECASE
COVER
BAR NUT
CHAIN
Fig. 15
DRIVECASE
COVER
CHAIN
TENSIONING PIN
BAR NUT
Fig. 16
BAR STUD SLOT
BAR STUD
CHAIN TENSIONING
PIN HOLE
BAR
SPROCKET
Fig. 17