Replacing The Bar And Chain; Idle Speed Adjustment; Chain Maintenance - Ryobi RPPGM Operator's Manual

■ During normal operation, the temperature of the chain
will increase. The drive links of a correctly tensioned
warm chain will hang approximately 1.30 mm (.050 in)
out of the bar groove, as shown in figure 14 (item 38).
NOtE: New chain tends to stretch; check chain tension
frequently and tension as required.
CaUtION
Chain tensioned while warm, may be too tight upon
cooling. Check the "cold tension" before next use.

REPLaCING tHE BaR aND CHaIN

See figures 15 - 20.
WaRNING
To avoid possible serious injury, stop engine before
replacing the bar, chain, or performing any maintenance
operation.
■ Remove the bar nut (item 39) and drivecase cover
(item 40).
■ The bar contains a bar stud slot (item 43) that fits over
the bar stud (item 41). The bar also contains a chain
tensioning pin hole (item 44) 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 (item 46) 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 (item
39) 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
counterclockwise. Lift the tip of the bar up and retighten
bar nut.
RPPGM_SAA_MAN_ENG_20110215_D8.indd 13
English

IDLE sPEED aDJUstMENt

See figure 21.
If the chain turns at idle, the idle speed screw (item 47)
needs adjusting on the engine. Turn the idle speed screw
counterclockwise to reduce the idle RPM and stop the
chain movement. If the saw chain still moves at idle speed,
contact a service dealer for adjustment and discontinue
use until the repair is made.
The saw chain should never turn at idle. Turn the
idle speed screw 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 personal injury may result from the saw
chain turning at idle.
aUtOMatIC BaR aND CHaIN LUBRICatION
See figure 22.
■ Use a premium blend of Bar and Chain Lubricant. It is
designed for chains and chain oilers and is formulated
to perform over a wide temperature range with no
dilution required.
■ Remove the cap and carefully pour approximately
230ml of bar and chain lubricant into the bar lube
reservoir.
■ Replace the cap and tighten securely.
■ Check and refill the bar lube reservoir every time the
engine is fueled.
NOtE: Do not use dirty, used or otherwise contaminated
lubricant. Damage may occur to the oil pump, bar, or
chain.

CHaIN MaINtENaNCE

See figure 23.
For smooth and fast cutting, the chain needs to be
maintained properly. The following conditions indicate that
the chain requires sharpening:
■ Wood chips are small and powdery
■ Chain must be forced through the wood during cutting
■ Chain cuts to one side
During maintenance of the chain, consider the following:
■ Improper filing angle of the side plate can increase the
risk of a severe kickback.
■ Depth gauge (or raker clearance) setting determines
the height the cutter enters the wood and the size of
the wood chip that is removed. Too much clearance
increases the potential for kickback. Too little
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WaRNING
15/02/2011 11:38 AM