Ryobi RY52004 Operator's Manual page 14

REPLACING THE BAR
See Figures 15 - 20.
WARNING:
To avoid possible serious injury, stop engine before re-
placing the bar, chain, or performing any maintenance
operation.
n Remove the bar nut and drivecase cover.
n 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.
n Place the bar onto the bar stud so that the chain tension-
ing pin fits into the chain tensioning pin hole.
n 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.
n Replace the side case cover and install the bar nut.
Tighten the bar nut finger tight only. The bar must be
free to move for tension adjustment.
CHAIN
BAR
CHAIN
TENSIONING PIN
BAR NUT
BAR STUD
SPROCKET
MAINTENANCE
DRIVECASE
BAR NUT
COVER
Fig. 15
DRIVECASE
COVER
Fig. 16
BAR
BAR STUD SLOT
CHAIN TENSIONING
PIN HOLE
Fig. 17
n Remove all slack from chain by turning the chain tension-
ing screw clockwise, assuring that the chain seats into
the bar groove during tensioning.
n 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.
n Hold the tip of the bar up and tighten the bar nut se-
curely.
n 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
BAR NUT
CHAIN
TENSIONING SCREW
14
CHAIN ROTATION
SPROCKET
Fig. 18
Fig. 19
BAR NUT
Fig. 20