24
C
D
Files and how to work with them
- Sharpen using a special file holder with a saw chain round
file. Normal round files are not appropriate for this work.
See "Accessories" for the order number.
- File the first cutter half with a 7/32" (5,5 mm) dia. round file,
then switch to a 3/16" (4,8 mm) dia. file.
- 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 nominal value for all other cutters of the chain.
- Replaced cutters must be exactly adopted to the shape of
the other cutters. This is also true for the depth gauges.
- Always guide the file horizontally (90o to the guide bar).
- The sharpening angle of 25o must be equal for all cutters.
Different angles result in a roughly, irregularly running
chain, increase wear and tear and cause chain ruptures.
- The front rake of 60o depends on the cut depth of the round
file. If the file to be used is guided correctly, the correct front
rake results automatically.
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"). Al-
ways wear protective gloves!
The chain needs sharpening when:
- The sawdust produced when sawing humid wood looks like
wood flour.
- The chain penetrates the wood only under great pressure.
- The cutting edge is visibly damaged.
- The sawing device is pulled to the left or right when sawing.
This is caused by an unequal sharpening of the chain.
Important: Sharpen regularly, but only slightly.
Generally 2-3 touches are enough.
Have the chain resharpened in a service center when you
have already sharpened it yourself several times.
Characteristics of a correctly sharpened chain (type 099):
- All cutters must be of the same length (=). Cutters with
different lengths result in a rough running of the chain and
produce cracks in the chain.
- The best cutting results are achieved with a depth limiter
distance of 0.65 mm (.025"). The distance between the
depth limiter and the cutting edge determines the depth of
the cut.
CAUTION:
If the distance is too wide, the risk of kickbacks
increases.
=
90°
25°
25°
=0,65 mm
(.025")
A
60°
60°