Makita EA3501F Instruction Manual page 26

Files and how to work with them
Use a special saw chain round file for sharpening. Standard
round files are unsuitable.
Type 484: File the first cutter half with a 4,8 mm dia. round
saw‑chain file, then switch to a 4.5 mm dia. file.
Type 492: Saw chain round file, dia. 4.0 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.
Chain typ Chain typ
File depending on chain type (90° or 10° to the guide bar).
484
492
A file holder makes file guidance easier. It is marked for the
4/5 correct sharpening angle of:
α = 30°
(keep the marks parallel with the chain when filing, see illu-
α
stration) and limits the cut depth to the correct 4/5 of the file
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 flat
file (1).
Round off the front of the depth limiter (2).
1 2
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