Replacing Carbon Brushes - Makita UC3551A Instruction Manual

Cleaning the guide bar and
lubricating the return sprocket
CAUTION:
• Always wear safety gloves for this task. Burrs
present a risk of injury.
Check the running surfaces of the bar regularly for
damage. Clean using a suitable tool, and remove burrs
if necessary.
If the chain saw receives frequent use, lubricate the
return sprocket bearing at least once a week. Before
adding new fresh grease, carefully clean the 2 mm hole
on the tip of the guide bar, then force a small quantity of
multi-purpose grease (optional accessory) into the hole.
Cleaning the oil guide
► 1. Oil guide groove 2. Oil feed hole
— Clean the oil guide groove and the oil feed hole in
the bar at regular intervals.
New saw chains
Use two or three saw chains alternately, so that the saw
chain, sprocket and running surfaces of the bar wear
evenly.
Turn the bar over when changing the chain so that the
bar groove wears evenly.
CAUTION:
• Only use chains and bars which are
approved for this model of saw (refer to
"SPECIFICATIONS").
► 1. Sprocket
Before fitting a new saw chain, check the condition of
the sprocket.
CAUTION:
•
Always fit a new locking ring when replacing the
sprocket.
Maintaining the chain and run-down
brakes
The braking systems are very important safety fea-
tures. Like any other component of the chain saw, they
are subject to a certain degree of wear. They must be
inspected regularly by MAKITA authorized or factory
service centers. This measure is for your own safety.

Replacing carbon brushes

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► 1. Limit mark
Remove and check the carbon brushes regularly.
Replace when they wear down to the limit mark. Keep
the carbon brushes clean and free to slip in the holders.
Both carbon brushes should be replaced at the same
time. Use only identical carbon brushes.
17 ENGLISH
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A worn sprocket damages a new saw chain.
Have the sprocket replaced in this case.
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