Makita UC3041A Instruction Manual page 17

— The side plate angle of the cutter is determined
by the depth of penetration of the round file. If the
specified file is used properly, the correct side
plate angle is produced automatically.
— Side plate angle for each saw chain are as follows:
Chain blade 90PX: 75 °
Chain blade 91PX: 80 °
► Fig.31: 1. Side plate angle
File and file guiding
— Use a special round file (optional accessory) for
saw chains to sharpen the chain. Normal round
files are not suitable.
— Diameter of the round file for each saw chain is as
follows:
Chain blade 90PX: 4.5 mm
Chain blade 91PX: 4.0 mm
— The file should only engage the cutter on the for-
ward stroke. Lift the file off the cutter on the return
stroke.
— Sharpen the shortest cutter first. Then the length
of this shortest cutter becomes the standard for all
other cutters on the saw chain.
► Fig.32
— Guide the file as shown in the figure.
— The file can be guided more easily if a file holder
(optional accessory) is employed. The file holder
has markings for the correct sharpening angle of
30 ° (align the markings parallel to the saw chain)
and limits the depth of penetration (to 4/5 of the
file diameter).
► Fig.33
— After sharpening the chain, check the height of the
depth gauge using the chain gauge tool (optional
accessory).
► Fig.34
— Remove any projecting material, however small,
with a special flat file (optional accessory).
— Round off the front of the depth gauge again.
Cleaning the guide bar and
lubricating the return sprocket
CAUTION:
• Always wear safety gloves for this task. Burrs
present a risk of injury.
► Fig.35
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
► Fig.36: 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").
► Fig.37: 1. Sprocket
Before fitting a new saw chain, check the condition of
the sprocket.
CAUTION:
• A worn sprocket damages a new saw chain.
Have the sprocket replaced in this case.
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 service
centers. This measure is for your own safety.
Storing tool
Biologically degradable saw chain oil can only be kept
for a limited period. Beyond two years after manufac-
ture, biological oils begin to acquire an adhesive quality,
and cause damage to the oil pump and components in
the lubricating system.
— Before taking the chain saw out of service for a
longer period, empty the oil tank and fill it with a
small quantity of engine oil (SAE 30).
— Run the chain saw briefly to flush all residue of the
biological oil out of the tank, lubricating system
and saw mechanism.
NOTE:
• When the chain saw is taken out of service,
small quantities of chain oil leaks from it for
some time afterwards. This is normal, and is not
a sign of a fault.
Store the chain saw on a suitable surface.
Before returning the chain saw to service, fill up with
fresh BIOTOP saw chain oil.
To maintain product SAFETY and RELIABILITY,
repairs, carbon brush inspection and replacement, any
other maintenance or adjustment should be performed
by Makita Authorized Service Centers, always using
Makita replacement parts.
17 ENGLISH