Use of a
filing guide
Use of a depth
gauge joiner
Use of a flat file
to round the front
corner of a depth
gauge
SHARPENING THE CHAIN
When cutting edges of the blade become dull, they can be resharpened with a few strokes of a file. In order to
keep the blade in balance, all cutting edges must be sharpened equally. Periodically check during operation
that the chain tension is correct. Check more frequently with a new chain. Tension is correct when the chain
feels a bit snug but can still move freely.
Sharpening instructions (Fig. 44)
IMPORTANT! Each cutter must be filed to the same
angle and depth! Unequal filing will cause the saw to
vibrate and cut erratically!
1. Using a 4,5 mm round file, sharpen each cutter to a
30° angle. Make sure that one fifth (20%) of the
file’s diameter is always held above the cutter’s top
plate.
NOTE! For consistent filing angle, use a filing
guide.
2. After all cutters are sharpened, use a depth gauge
joiner to measure the height of each depth gauge.
3. If necessary, lower the depth gauges to a height of
0,5 mm using a flat file.
4. After all depth gauges are of correct depth, use a
flat file to round each depth gauge leading edge to
its original curvature and angle.
Correct filing technique
Keep all cutter lengths equal
Slightly protruding
hook or point (curve
on non-chisel chain)
Correct angle
on top plate
Top of depth gauge
at correct height
below top plate
Front of depth
gauge rounded
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