Craftsman 316380900 user manual download

For Devices:Craftsman 316380900   and 1 more
Languages:English
Pages:64
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Page 21 of 64
ADJUSTING
THE
CHAIN
TENSION
_
AUTION:
The guide bar, saw chain, and saw bearings
will wear more rapidly if the saw chain is not properly
tensioned.
Maintaining
proper
chain tension will improve
cutting
performance
and prolong the life of the saw chain.
WARNING:
To prevent serious
injury, never touch the
saw chain
or adjust the chain tension
while the unit is
running.
Disconnect
the spark plug wire to prevent the unit
from starting
accidentally.
WARNING:
The saw chain
is very sharp. Always wear
heavy-duty
protective
gloves when handling
or performing
maintenance
on the saw chain.
Check the chain tension
before and during operation.
Adjust the
chain tension
whenever
the flats on the saw chain
hang out of the
bar groove (Fig. 25).
NOTE: A new saw chain tends to stretch
and will need readjustment
after as few as five (5) cuts. This is normal during the break-in
period. The interval between
future adjustments
will lengthen
quickly.
1.
Make sure the chain brake is disengaged.
Refer to
Testing the
Chain Brake
in the
Assembly
section.
2.
Use the multi-purpose
tool or a 1/2 inch (13 mm) wrench to
slightly
loosen the bar-retaining
nuts (Fig. 26).
3.
Hold the guide bar tip up and use a flat-head
screwdriver
to turn
the chain-tensioning
screw
(Fig. 26).
• Turn the chain-tensioning
screw
clockwise
to tighten
the saw
chain.
Turn the chain-tensioning
screw
counterclockwise
to loosen
the saw chain.
The desired chain tension
depends
upon the temperature
of the
saw chain (Fig. 27).
Cold Chain Tensioning
- The saw chain should
fit snuggly
against the underside
of the guide bar. There should
be no sag
(Fig. 27).
Warm Chain Tensioning
- The saw chain will expand
as it
heats up during operation.
The drive links should
hang
approximately
1/16 inch (1.3 mm) out of the guide bar groove
(Fig. 27).
4.
Hold the guide bar tip up and move the saw chain
back and
forth
along the guide
bar (Fig. 28). Make sure the saw chain
moves freely and is in proper
mesh with the sprocket.
If the saw
chain
does not move easily, slowly turn the chain-tensioning
screw
counterclockwise
to loosen the saw chain.
NOTE: The saw chain will not move if the chain brake
is engaged.
5.
Hold the guide bar tip up and securely tighten the bar-retaining nuts.
CAUTION:
If
the saw chain was tensioned
while warm,
it
may become too tight when cooled.
Loosen the chain
tension after operation
and check the chain tension
before
the next use.
Fiats
Drive
Links
Fig. 25
Guide
Bar
il
......
_J
Bar=Retaining
Nuts
Guide
Bar
Tip
_
t
_
Chain=Tensioning
Screw
Fig. 26
Correct
Cold
Tension
Too Loose
Correct
Warm
Tension
Fig. 27
Fig. 28
21
Sample