Shindaiwa 62891-94311 Sharpening the Chain, For consistent filing angles, use a filing guide

Maintenance (cont.)

Sharpening the Chain

When the cutting edges of the blade become dull, they can be re-sharpened with a few strokes of a file.

In order to keep the blade in balance, all cutting edges must be sharpened equally.

In addition, inspect the chain for correct adjustment (more frequently with a new chain). The chain should feel snug but still pull freely. Refer to the section on “Adjusting the Chain” for adjustment procedures.

IMPORTANT!

File all cutters to the same angle and depth! Unequal filing may cause the saw to vibrate or cut erratically!

1.Using a 4.5 mm round file, sharpen all cutters to a 30° angle.

NOTE:

For consistent filing angles, use a filing guide

2.After all cutters are sharpened, use a depth gauge joiner to measure the height of each depth gauge.

3.As required, lower the depth gauges to a height of 0.6 mm.

4.After all depth gauges have been adjusted, use a flat file to round each depth gauge leading edge to its original curvature and angle.

Using a filing

gauge.

Using a depth gauge

joiner.

CHN-18

Using a flat file

to round the

front corner on a

depth gauge.

Correct Filing Technique

Correct angle	Slightly protruding hook
on top plate
	or point (curve on non-
	chisel chain)
	Top of depth gauge at
	correct height below top
	plate
	Front of depth
	gauge rounded

A

All cutting edges must be sharpened equally

0.025” (0.64 mm)

A=B B 0.025"

Filing Problems

Top plate		Cause	Top plate angle	Cause	High depth	Cause
angle less than		File held at less than	more than	File held at more than	gauge	Depth gauge never filed.
recommended		recommended angle.	recommended	recommended angle.		Result
		Result		Result		Slow cutting. Must force
		Slow cutting. Requires extra		Cutting angle is very sharp		chain to cut. Will cause
	20°	effort to cut.	50°	but will dull fast. Cutting		excessive wear on the cutter
		Remedy		action rough and erratic.		heel.
		File cutters to recommended		Remedy	CHN-04	Remedy
		angle.		File cutters to recommended		Lower gauges to
				angle.		recommended setting.
Hook in side		Cause	Backslope	Cause	Low depth	Cause
plate cutting		File held too low or the file	on side plate	File held too high or the file	gauge	Wrong gauge setting or no
edge		was too small.	cutting edge	was too large.		gauge used.
		Result		Result		Result
		Rough cutting. Chain grabs.		Cutters won’t feed into		Rough cutting. Chain grabs.
		Cutters dull quickly or won’t		wood. Slow cutting. Must		Saw won’t pull chain through
		hold a cutting edge.		force chain to cut. Causes		wood. Excessive wear on the
		Remedy		excessive bottom wear.		cutter heel.
		Check file size. File cutters to		Remedy		Remedy
		recommended angle.		File cutters at recommended		If depth gauges are too
				angle. Check file size.		low, the chain is no longer
						serviceable.

18