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Operating and maintenance information - Maintenance and care of the cutting gear
ENGLISH 33
E
N
G
Sharpening the saw chain
Just like any other cutting tool, the saw chain is subject to natural wear. Your chainsaw will only be
able to deliver its full potential if the saw chain is correctly sharpened.
Symptoms of a blunt saw chain or one which has been sharpened incorrectly:
o Poor cutting performance and floury chippings ! the saw chain is blunt.
o Chip size too small ! The depth limiter spacing is too small.
o Chip size too large and increased kickback tendency ! The depth limiter spacing is too large.
o Saw pulls to one side while cutting ! The saw chain is not evenly sharp.
o Visually apparent damage to the cutting surfaces.
Experience is needed to correctly sharpen the saw chain. If you are unsure, have the saw chain
checked by a specialist workshop and re-sharpened as required. The information provided below is
intended for experienced users or specialist workshops.
A special round chain file with the correct diameter should be used for sharpening. Normal round files
are not suitable.
Chain - code Pitch in inches Files Ø mm/inches Filing angle α Depth limiter spacing b mm/inches
21BP… .325’’ 4,8 /
3
/
16
30° 0,64 / .025
21LP... .325’’ 4,8 /
3
/
16
25° 0,64 / .025
73LP… 3/8’’ 5,5 /
7
/
32
25° 0,64 / .025
73D, DP… 3/8’’ 5,5 /
7
/
32
35° 0,64 / .025
Filing direction: 10° upw Filing direction: 0° horizon
21BP…, 21LP…,73LP… 73D, DP…
A file holder makes guidance of the file easier, as it has
markings for the correct sharpening angle (align the
markings parallel to the saw chain) and limits the
penetration depth (4/5 of the file diameter)
Position the file holder on the roof of the tooth. The file should only engage
during the forward stroke. Lift the file off when moving it back.
The shortest cutting tooth is sharpened first. The length of this tooth is then the
target size for all the other teeth on the saw chain. All of the cutting elements
must have the same length.
To start with, file all of the cutting elements on one side from the inside
outwards, then file all of the cutting elements on the other side.
Always fully file out any damage from the side plate or the roof of the tooth.
Correction of the depth limiter:
The distance b between the depth limiter (round nose) and the cutting edge defines
the thickness of the chips. The best cutting results are obtained with the prescribed
depth limiter spacing, which should be checked every time the saw chain is
sharpened.
Lay the depth limiter gauge on the cutting element. If the depth limiter protrudes,
file off the protruding part with a flat file.
Round off the front edge of the depth limiter. The original shape must be restored.
CAUTION: If the spacing is too large then there is a greater risk of
kickback.
For your safety: If you would like to pull the chain through while filing, pull the chain forwards
with a screwdriver towards the tip of the rail. This will reduce the risk of slipping.
α
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