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1 2
4/5
Chain typ
290
Chain typ
492
Files and how to work with them
Use a special saw chain round Þ le for sharpening. Standard
round Þ les are unsuitable.
Type 492: Saw chain round Þ le, dia. 4.0 mm
Type 290: Saw chain round Þ le, dia. 4.5 mm.
The Þ le should cut only when pushed forwards (arrow). Lift the
Þ le 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 Þ led to the exact same shape as the
used teeth, including on their running surfaces.
File depending on chain type (90° or 10° to the guide bar).
A Þ le holder makes Þ le guidance easier. It is marked for the
correct sharpening angle of:
α = 25°
α = 30°
α = 35°
(keep the marks parallel with the chain when Þ ling, see illustration)
and limits the cut depth to the correct 4/5 of the Þ le diameter.
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 ß at
Þ le (1).
Round off the front of the depth limiter (2).
α
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