Makita UC3050A Bedienungsanleitung Seite 17

— The saw pulls to the left or right in the wood. The
reason for this behavior is uneven sharpening of
the saw chain, or damage to one side only.
Sharpen the saw chain frequently,
but remove only a little material each
time.
Two or three strokes with a file are usually sufficient
for routine resharpening. When the saw chain has
been resharpened several times, have it sharpened in
MAKITA authorized service center.
Sharpening criteria:
— All cutter length must be equal. Cutters of differing
length prevent the chain from running smoothly,
and may cause the chain to break.
— Do not sharpen the chain once a minimum cutter
length of 3 mm has been reached. A new chain
must then be fitted.
— The chip thickness is determined by the distance
between the depth gauge (round nose) and the
cutting edge.
— The best cutting results are obtained with following
distance between cutting edge and depth gauge.
Chain blade 91PX: 0.65 mm
► Fig.31: 1. Cutting length 2. Distance between
cutting edge and depth gauge 3. Minimum
3 mm
WARNING:
• An excessive distance increases the risk of
kick-back.
— The sharpening angle of 30 ° must be the same
on all cutters. Differences in angle cause the chain
to run roughly and unevenly, accelerate wear, and
lead to chain breaks.
— 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 91PX: 80 °
► Fig.32: 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 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.33
— 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.34
— After sharpening the chain, check the height of the
depth gauge using the chain gauge tool (optional
accessory).
► Fig.35
— 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.36
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.37: 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.38: 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.
17 ENGLISH