Craftsman 316380900 user manual download

For Devices:Craftsman 316380900   and 1 more
Languages:English
Pages:64
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Page 23 of 64
SHARPENING
THE
SAW CHAIN
WARNING:
The saw chain
is very sharp. Always wear
heavy-duty
protective
gloves when handling
or performing
I
maintenance
on the saw chain.
WARNING:
An improperly
sharpened
saw chain
i
increases the chance of kickback.
Failure to replace or
I
properly
maintain
the saw chain can cause serious
injury.
CAUTION:
A dull or improperly
sharpened
saw chain
I
can cause excessive
engine speed during operation,
which
!
can result in severe engine damage.
If the saw chain was damaged
by contacting
hard objects,
such as
nails or stones,
or was abraded
by mud or sand on the wood,
have
a Sears or other qualified
service dealer sharpen
the saw chain.
When sharpening
the saw chain, file all cutters
to the specified
angles and measurements.
Other
angles or measurements
can
cause excessive
wear to the guide bar and saw chain, cause the
chain to dull quickly and increase the chance
of kickback.
Fast
cutting
can be obtained
only when all cutters
are uniform.
1.
Tighten
the chain tension
so that the saw chain is taut and does
not wobble.
Refer to
Adjusting
the Chain Tension.
+ Always file the saw chain
at the midpoint
of the guide bar.
2.
Use a round file and file holder (tools not included) to sharpen
the top
plate and side plate of each cutter.
+ Use a 5/32 inch (4 mm) diameter
file.
+ Keep the file level with the top plate of the cutter
(Fig. 33). Do
not let the file dip or rock. Use light, but firm pressure.
+ File toward
the front corner
of the cutter
(Fig. 34). Lift the file
away from the cutter
at the end of the forward
stroke.
Only file
on the forward
stroke.
+ Apply
a few firm strokes to each tooth.
When filed correctly,
the top
plate will be at a 30° angle and the side plate will be at
an 80° angle (Fig. 35). Using the correct
file and file holder will
automatically
produce
the correct
angles.
+ File all the left-hand
cutters
in one direction
(Fig. 34). Then
move to the other side of the saw chain
and file all of the right-
hand cutters
in the opposite
direction
(Fig. 34).
+ Occasionally
remove filings with
a wire brush.
3.
Use a depth
gauge tool (not included)
to measure the depth
gauge clearance
(Fig. 36) of each cutter. The depth
gauge
clearance
must be maintained
at 1/32 inch (0.6 ram). The depth
gauge clearance
determines
the depth
at which the cutter
enters
the wood
during
operation
and the size of the wood
chips
produced.
Too much clearance
increases the chance
of
kickback.
Too little clearance
decreases
the size of the wood
chips,
thus deceasing
the ability to cut.
+ Use a 1/32 inch (0.6 mm) depth gauge jointer
and a flat file
(tools not included)
to lower the depth gauge to the correct
clearance
(Fig. 36).
+ After lowering
the depth
gauge, use the flat file to restore the
original rounded
shape to the depth
gauge (Fig. 37). Take care
not to damage
the cutting
edges or nearby links.
_,
Depth
Gauge
Clearance
t
1/32
inch
(0.6 ram}
Top Plate
Side
Plate
Fig.
33
Filing
Angle
Right-Hand
Cutters
Fig.
34
Correct
Filing
Angles
Side
Plate
Fig.
35
Depth
Gauge
Jointer
Depth
Gauge
Left-Hand
Cutters
Top
Plate
/,
30
°
Fiat
File
Fig.
36
23
Sample