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SERVICE AND ADJUSTMENTS (
WARNING:
plug before performing maintenance, service, or
adjustments except for idle speed adjustments.
CHAIN SHARPENING
WARNING:
ing techniques and/or depth gauge mainte-
nance will increase the chance of kickback
which can result in serious injury.
WARNING:
when handling chain. The chain is sharp and
can cut you even when it is not moving.
Conditions which indicate the need for chain
sharpening:
S Reduction in size of wood chips. The size of
the wood chip will decrease as the chain
gets duller until it becomes more like a
powder than a chip. Note that dead or rotted
wood will not produce a good chip.
S Saw cuts to one side or at an angle.
S Saw has to be forced through the cut.
Tools required:
S 3/16 inch (4,5 mm) diameter round file and
file holder
S Flat file
S Depth gauge tool
TO SHARPEN CHAIN:
1. Disconnect spark plug.
2. Check chain for proper tension. Adjust
chain tension if necessary. See CHECK
CHAIN TENSION section.
3. Sharpen cutters.
S To sharpen the cutters, position the
file holder level (90° ) so that it rests on
the top edges of the cutter and depth
gauge.
NOTE:
The chain has both left and
right hand cutters.
File Holder
File
Cutter
Depth Gauge
S Align the 30° file holder marks parallel
with the bar and to the center of the
chain.
30°
File Holder Line
Disconnect the spark
Improper chain sharpen-
Wear protective gloves
90°
Cutter
Cutter
PRUNER ATTACHMENT)
S Sharpen cutters on one side of the chain
first. File from the inside of each cutter to
the outside. Then, turn the chain saw
around and repeat the process for the
other side of the chain.
S File on the forward stroke only. Use 2
or 3 strokes per cutting edge.
S Keep all cutters the same length when
filing.
S File enough to remove any damage to
cutting edges (side plate and top plate
of cutter).
All Cutters
Same Length
S File chain to meet the specifications
as shown.
30°
Hook Angle
Too Much Hook Angle
WARNING:
angle according to the manufacturer's specifica-
tions for the chain you are using. Improper hook
angle will increase the chance of kickback
which can result in serious injury.
4. Check and lower depth gauges.
Depth Gauge Tool
26
Remove Damage
Top Plate
Side Plate
75°
0.025 inch
(0.65 mm)
Rounded
Corner
Right
Squared Off
Corner
Wrong
Maintain the proper hook
File
Depth Gauge
60°
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