27
MAINTENANCE
Sharpening the saw chain
CAUTION: Before doing any work on the guide bar or chain,
always switch off the engine and pull the plug cap off the
spark plug
(see "Replacing the spark plug")
. Always wear
protective gloves!
The chain needs sharpening when:
The sawdust produced when sawing damp wood looks
like wood flour.
The chain penetrates the wood only under great pressure.
The cutting edge is visibly damaged.
The saw is pulled to the left or right when sawing. This is caused
by uneven sharpening of the chain.
Important: Sharpen frequently, but without removing too
much metal!
Generally, 2 or 3 strokes of the file will be enough.
Have the chain resharpened at a service center when you have
already sharpened it yourself several times.
A
Proper sharpening:
CAUTION: Use only chains and guide bars designed for
this saw
(see the Extract from the spare-parts list)
!
All cutters must be of the same length (dimension a). Cutters
with different lengths result in rough running of the chain and
can cause cracks in the chain.
Minimum cutter length is 0." (3 mm). Do not resharpen
the chain when the minimum cutter length has been
reached; at this point, the chain must be replaced (see the Extract
from the spare-parts list and "Replacing the chain").
The depth of the cut is determined by the difference in height
between the depth limiter (round nose) and the cutting edge.
The best results are obtained with the depth-limiter depth of
.025" (0.64 mm).
CAUTION:
Excessive depth increases
the risk of kickback!
B
min.
3 mm (0.11”)
All cutters must be sharpened to the same angle, 30°. Different
angles result in a roughly, irregularly running chain, increase
wear and tear and cause chain breakage.
The 85° front rake of the cutter results from the cut depth
of the round file. If the proper file is used in the right manner,
the correct front rake will be obtained automatically.
C
.025"
(0.64 mm)
.025"
(0.64 mm)
