Makita EA3501S - Saw Chain Sharpening Tools; Files and How to Work With Them

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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