Makita EA3500SRDB - Page 34

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Chain type
492 (91PX), 290 (90SG),
291 (90PX)
Files and how to work with them
Use a special saw chain round le for sharpening. Standard
round les are unsuitable.
Type 492 (91PX): Saw chain round le, dia. 5/32” (4.0 mm).
Type 290 (90SG), 291 (90PX): Saw chain round le,
dia. 11/64” (4.5 mm).
The le should cut only when pushed forwards (arrow). Lift
the le when leading it backwards.
First sharpen the shortest cutter. The length of this cutter is
then the standard for all other cutters of the chain.
New saw teeth must be led 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 le holder makes le guidance easier. It is marked for the
correct sharpening angle of:
α = 30°
(keep the marks parallel with the chain when ling, see
illustration) and limits the cut depth to the correct 4/5 of the
le diameter.
After having sharpened the chain, the height of the depth
limiter must be checked by means of a chain gauge.
Correct even the smallest excess height with a special at
le (1).
Round off the front of the depth limiter (2).
α