Maintenance; General Maintenance - Ryobi RY15520 Manuel D'utilisation

WARNING:
When servicing, use only identical replacement parts.
Use of any other parts may create a hazard or cause
product damage.
WARNING:
Always wear eye protection with side shields marked to
comply with ANSI Z87.1, as well as hearing and head
protection, when operating this equipment. Failure to do
so could result in objects being thrown into your eyes and
other possible serious injuries.
WARNING:
Before inspecting, cleaning, or servicing the unit (except
for carburetor adjustments), shut off engine or motor, wait
for all moving parts to stop, and disconnect spark plug
wire and move it away from spark plug or disconnect
from power supply. 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, oil, grease, etc.
WARNING:
Do not at any time let brake fluids, gasoline, petroleum-
based products, penetrating oils, etc., come in contact
with plastic parts. Chemicals can damage, weaken, or de-
stroy plastic, which may result in serious personal injury.
Only the parts shown on the parts list are intended to be
repaired or replaced by the customer. All other parts should
be replaced at an authorized service center.
WARNING:
To avoid possible serious injury, never touch or adjust
the chain while the motor is running. The chain is very
sharp; always wear protective gloves when performing
maintenance to the chain.
REPLACING THE BAR AND CHAIN
See Figures 10 - 15.
Replacement Bar Part Number: 671834008
Replacement Chain Part Number: 690583003

MAINTENANCE

To avoid possible serious injury, stop engine or motor and
remove the spark plug wire or disconnect from power
supply before replacing 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 drive case cover and reinstall 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 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 1/2 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 and the chain is snug, but 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.
Check the chain tension frequently when operating the
unit. Never touch or adjust the chain while the engine or
motor is running. The chain is very sharp; always wear
protective gloves when performing maintenance to the
chain.
POWER HEAD IDLE SPEED ADJUSTMENT
(GAS POWER HEADS ONLY)
If the chain turns at idle, the idle speed screw needs adjusting
on your gas power head engine. Turn the idle speed screw
counterclockwise to reduce the idle RPM and stop the chain
movement. Refer to your power head Operator's Manual for
more details. If the chain still moves at idle speed, contact
a service dealer for adjustment and discontinue use until
the repair is made.
9 — English
WARNING:
WARNING: