Craftsman 316380900 user manual download (Page 24 of 64)

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Page 24 of 64
Restore
original
rounded
shape
Fig.
37
MAiNTAiNiNG
THE GUIDE
BAR
1.
Rotate the guide bar frequently,
at regular
intervals
(for example,
after every 5 hours of operation),
to ensure even wear on the top
and bottom
of the guide bar. Refer to
Removing
and Installing
the Guide Bar and Saw Chain.
2.
Clean the guide bar groove and oil passages
whenever
the saw
chain is removed, when
the unit has been used heavily or when
the saw chain appears
dirty. Use a screwdriver,
putty knife, wire
brush or similar
instrument
to remove debris from the guide bar
groove (Fig. 38). Use a small, soft wire to remove
any debris
from the chain
oil discharge
hole (Fig. 39).
NOTE: If the oil passages
are clear, the saw chain will give off a
spray of oil shortly
after it begins to rotate during operation.
3.
Frequently
check
the guide bar for damage
(Fig. 40). Feathering
and burring
of the guide
bar rails (the ridges
on either side of the
bar groove)
is a normal process
of guide bar wear. Such faults
should
be smoothed
with
a file as soon as they occur (Fig. 40). A
guide bar with the following
faults should
be replaced:
• Wear inside the guide bar rails that permits
the chain to lay
sideways
Bent guide bar
Cracked
or broken rails
Spread
rails
Refer to
Replacing
the Guide Bar and Saw Chain.
Lubricating
the
Guide
Bar Sprocket
Tip
The guide
bar sprocket
tip was lubricated
at the factory,
but requires
regular lubrication.
Failure to lubricate
the guide bar sprocket
tip will
result in poor performance,
damage
to the unit and will VOiD the
warranty.
NOTE: This procedure
can be performed
while
the guide bar and
saw chain are still assembled
on the unit.
1.
Clean the guide bar sprocket
tip thoroughly
with a damp cloth
(Fig. 41).
2.
Use a guide bar tip lube gun (not included) to inject grease into
the lubrication
hole (Fig. 41). Inject grease until it appears
on the
outer edge of the guide bar sprocket
tip.
3.
Rotate the saw chain
by hand. Always wear heavy-duty
protective
gloves. Make sure the chain
brake is disengaged.
4.
Repeat the lubrication
process
until the entire guide bar
sprocket
tip is lubricated.
Oil
Passage
Guide
Fig.
38
Chain
Oil
Discharge
Hole
Fig.
39
Fiat File
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Bur
Uneven Wear
Spread Rails
Fig. 4O
24
Sample
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