Maintenance; Chain Tension - Ryobi RY52504 Operator's Manual

WARNINg:
When servicing, use only identical replacement parts.
Use of any other parts may create a hazard or cause
product damage.
WARNINg:
Always wear safety goggles or safety glasses with side
shields during power tool operation or when blowing
dust. If operation is dusty, also wear a dust mask.
WARNINg:
Before inspecting, cleaning or servicing the unit (except
for carburetor adjustments), shut off engine, wait for all
moving parts to stop, and disconnect spark plug wire
and move it away from spark plug. Failure to follow
these instructions can result in serious personal injury or
property damage.
gENERAL MAINTENANCE
Avoid using solvents when cleaning plastic parts. Most
plastics are susceptible to damage from various types of
commercial solvents and may be damaged by their use. Use
clean cloths to remove dirt, dust, lubricant, grease, etc.
WARNINg:
Do not at any time let brake fluids, gasoline, petroleum-
based products, penetrating lubricant, etc., come in con-
tact with plastic parts. Chemicals can damage, weaken, or
destroy plastic, which may result in serious personal
injury.
All chain saw service, other than the items listed in the instruc-
tion manual maintenance instructions, should be performed
by competent chain saw service personnel. (For example, if
improper tool is used to hold the flywheel in order to remove
the clutch, structural damage to the flywheel could occur
and subsequently could cause the flywheel to burst).

CHAIN TENSION

See Figures 13 - 14.
WARNINg:
To avoid possible serious injury, never touch or adjust the
chain while the motor is running. The saw chain is very
sharp; always wear protective gloves when performing
maintenance to the chain.

MAINTENANCE

 Stop the engine before setting the chain tension. Make
sure the guide bar nut is loose to finger tight, turn the
chain tensioning screw clockwise to tension the chain.
Refer to Replacing the Bar and Chain for additional
information.
NOTE: A cold chain is correctly tensioned when there is
no slack on the underside of the guide bar, the chain is
snug, but it can be turned by hand without binding.
 Chain must be re-tensioned whenever the flats on
the drive links hang out of the bar groove as shown in
figure 13.
 During normal operation, the temperature of the chain
will increase. The drive links of a correctly tensioned
warm chain will hang approximately .050 in. out of the
bar groove, as shown in figure 14.
NOTE: New chain tends to stretch; check chain tension
frequently and tension as required.
Chain tensioned while warm, may be too tight upon cool-
ing. Check the "cold tension" before next use.
14
CAUTION:
fLATS
APPROX .050 in.
Fig. 13
Fig. 14