30
7. Make a few rm strokes on every tooth.
File all left hand cutters in one direction.
Then move to the other side and le the
right hand cutters in the opposite direction.
Occasionally remove lings from the le
with a wire brush (Fig. 33).
WARNING
A dull or improperly
sharpened chain can
cause excessive motor speed during
cutting, which may result in severe motor
damage.
WARNING
Improper chain
sharpening increases the
potential of kickback.
WARNING
Failure to replace or
repair a damaged chain
can cause serious injury.
Top-Plate Sharpening Angles (Fig. 34)
•
CORRECT 30°- This optimal angle can be
obtained only when the specied les and
proper setting are used. File holders are
marked with guide marks to align the le
properly to produce the correct top plate
angle.
•
LESS THAN 30°- The tooth is too dull for
cutting.
•
MORE THAN 30°- The edge of the cutting
tooth is feathered and dulls quickly.
Side-Plate Angle (Fig. 35)
•
CORRECT 55°- The optimal angle can be
produced automatically if the correct diameter
le is used in the le holder.
•
HOOK- “Grabs” and dulls quickly. Increases
potential of KICKBACK. Results from using a
le with a diameter that is too small, or a le
held too low.
•
BACKWARD SLOPE- Needs too much feed
pressure, causes excessive wear to bar
and chain. Results from using a le with a
diameter too large, or a le held too high.
Depth-Gauge Clearance
1. The depth gauge should be maintained at a clearance of 0.025 in. (0.6 mm), as shown
in Fig. 36. Use a depth-gauge tool (available separately) to check the depth-gauge
clearances.
2. Check the depth-gauge clearance every time the chain is led.
Use a at le and a depth-gauge jointer (both available separately) to lower all gauges
uniformly (Fig. 37). Depth-gauge jointers are available in 0.020 in. to 0. 035 in.
(0.5 mm to 0.9 mm). Use a 0.025 in. (0.6 mm) depth-gauge jointer.
30°
Fig.34
Top Plate Sharpening Angles
Less
Than 30°
Correct Incorrect Incorrect
More
Than 30°
80°
Fig.35
Side Plate Angle
Hook
Correct Incorrect Incorrect
Backward
Slope
Fig. 33
Left Hand
Cutters
Right Hand
Cutters
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