Makita BUC300 Instruction Manual page 17

MAINTENANCE
CAUTION:
Always be sure that the tool is switched off and the
•
battery cartridge is removed before attempting to
perform inspection or maintenance.
Always wear gloves
•
inspection or maintenance.
Never use gasoline, benzine, thinner, alcohol or
•
the like. Discoloration, deformation or cracks may
result.
Sharpening the saw chain
CAUTION:
Always remove the battery cartridge and wear
•
safety gloves when performing work on the saw
chain.
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Sharpen the saw chain when:
− Mealy sawdust is produced when damp wood is
cut;
− The chain penetrates the wood with difficulty, even
when heavy pressure is applied;
− The cutting edge is obviously damaged;
− The saw pulls to the left or right in the wood. The
reason for this behaviour 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 a
MAKITA specialist repair shop.
File and file guiding
− Use a special round file (optional accessory) for
sharpening.
− Saw chain type 91VG and 91PX: Saw chain
round file, diameter 4.0 mm
− Saw chain type 90SG: Saw chain round file,
diameter 4.5 mm
when performing any
1
1. File forward stroke
2. 1/5 of the file diameter
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− The file should only engage the material on the
forward stroke. Lift the file off the material on the
return stroke.
− Sharpen the shortest cutter first. The length of this
cutter is then the gauge dimension for all other
cutters on the saw chain.
− Guide the file as shown in the figure.
− The file can be guided more easily if a file holder
(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).
Guide the file as shown in the figure.
− After sharpening the chain, check the height of the
depth gauge using the chain gauge tool (optional
accessory).
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− Remove any projecting material, however small,
with a special flat file (optional accessory).
− Round off the front of the depth gauge again.
− Wash away dust and particles from saw chain
after adjusting the height of depth gauge.
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