Bedienungsanleitung Solo 644 (Seite 33 von 46) (Englisch)

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Operating and maintenance information - Maintenance and care of the cutting gear

ENGLISH 33

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 /

30° 0,64 / .025

21LP... .325’’ 4,8 /

25° 0,64 / .025

73LP… 3/8’’ 5,5 /

25° 0,64 / .025

73D, DP… 3/8’’ 5,5 /

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.

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Solo 644 Seite 33

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