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MAINTENANCE
Sharpening the saw chain
When working on the saw chain you must always pull
out the power supply plug and wear protective gloves.
A
The chain needs sharpening when:
- the sawdust from sawing humid wood looks like wood
flour.
- the saw chain penetrates the wood only under great
pressure.
- the cutting edge is visibly damaged.
- the sawing device is pulled to the left or the right during the
sawing operation. This is caused by uneven sharpening
of the chain or by damage to one side of it.
Important: Sharpen frequently, but without removing
too much metal!
Generally, 2-3 strokes of the file will be enough.
Have the chain resharpened in a service center when you
have sharpened it yourself several times.
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 0.11” (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 a depth-limiter depth of
.025" (0.65 mm).
CAUTION:
Excessive depth increases the
risk of kickback!
B
min.
3 mm (0.11”)
.025"
(0.65 mm)
.025"
(0.65 mm)
C
- 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 beakage.
- 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.
D
Files and how to work with them
- Use a special round file dia. 4.0 mm for chains for sharpening
the chain. Normal round files are not appropriate for this
work. See "Accessories" for the order number.
- The file should cut only when pushed forwards (arrow).
Lift the file when leading it backwards.
- First sharpen the shortest cutter. The length of this cutter
is then the standerd for all other cutters of the chain.
- Always guide the file as in fig. "D" shown.