General Maintenance; Chain Tension; Replacing The Bar And Chain - Ryobi RPP720 Operator's Manual

to reduce the weight. Following proper cutting
procedures will prevent stripping the bark from the
main member.
Do not use the pole saw for felling or bucking.
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To prevent electrocution, do not operate within 5m of
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overhead electrical lines.
Keep bystanders at least 5m away.
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MaINTENaNCE
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,
stop the motor, wait for all moving parts to stop,
and 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, petrol,
petroleumbased products, penetrating oils, etc.,
come in contact 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
instruction manual maintenance instructions, should be
performed by competent chain saw service personnel.

CHaIN TENSION

See Figures 0-
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.
ENGLISH
Stop the motor and disconnect from power supply
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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
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the drive links hang out of the bar groove as shown in
Fig. 0.
During normal operation, the temperature of the chain
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will increase. The drive links of a correctly tensioned
warm chain will hang approximately .050 in. out of the
bar groove, as shown in fig. .
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 -5
Remove the bar nut (mm) and drivecase cover.
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The bar contains a bar stud slot that fits over the bar
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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
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tensioning pin fits into the chain tensioning pin hole.
Fit the chain over the sprocket and into the bar
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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.
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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
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tensioning 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
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tip of the bar, and turn the chain tensioning screw /
turn clockwise. Repeat this process until sag does not
exist.
Hold the tip of the bar up and tighten the bar nut
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securely.
Chain is correctly tensioned when there is no slack on
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the underside of the bar, the chain is snug, but it can
be turned by hand without binding.
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