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Files and how to work with them
Use a special round file (4.8 mm dia., 3/16") 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. F shown (90° to the guide
bar).
E
F
- 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.
G
- The file holder makes file guidance easier. It is marked for
the correct 30° sharpening angle (keep the marks parallel
with the chain when filing, see illustration) and limits the cut
depth to the correct 4/5 of the file diameter. See "Accesso-
ries" for the order number.
4/5
H
- After having sharpened the chain, the height of the depth
limiter must be checked by means of a chain gauge. See
"Accessories" for the order number.
- Correct even the smallest excess height with a special flat
file (H). See "Accessories" for the order number.
- Round off the front of the depth limiter (I).
I
30°
Cleaning the guide bar
CAUTION:
Protective gloves must be worn.
J
Regularly inspect the bearing surfaces of the guide bar for
damage, and clean them with a suitable tool.