Dolmar PS-35 C Operator's And Safety Manual page 35

Chain typ
290, 492
α
1
Files and how to work with them
Use a special saw chain round file for sharpening. Standard
round files are unsuitable.
Type 492: Saw chain round file, dia. 5/32" (4.0 mm)
Type 290: Saw chain round file, dia. 11/64" (4.5 mm).
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.
New saw teeth must be filed to the exact same shape as the
used teeth, including on their running surfaces.
File depending on chain type (90° to the guide bar).
A file holder makes file guidance easier. It is marked for the
4/5 correct sharpening angle of:
(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 "Accessories" for the order number.
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 (1). See „Accessories" for the order number.
Round off the front of the depth limiter (2).
2
α = 25°
α = 30° (290, 492)
α = 35°
35