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15/
CUTTERS EDGE FIRE RESCUE SAWS
ADJUSTING THE CHAIN TENSION
Wearing gloves or using a rag to protect your
hand, pull up on the tip of the guide bar. While
holding up the guide bar tip, tighten the chain
tension adjustment screw (Fig. 6 on page 13) by
turning it clockwise. While still holding up the bar
tip, tighten the two clutch cover nuts (Fig. 8).
Holding up the tip of the bar takes out any slack
between the bar mounting slot and the two
mounting studs. This will eliminate any upward
movement of the guide bar when cutting pres-
sure is applied at the bottom of the bar.
Any such upward movement of the bar could
cause the chain to loosen.
Proper chain tension is a key factor in reducing
carbide breakage and increasing guide bar life.
Proper chain tension has the chain as tight as
possible without restricting chain movement.
(Fig. 8)
At proper tension, the chain should move along
the bar freely. You should feel only the resistance
of the sprocket and clutch drum turning. If the
chain does not move smoothly (catches or
requires excessive force to move) it is too tight.
At proper tension, the chain is in full contact with
the bar along the bottom rails, (Fig.8) there is no
"sag". (Fig. 9).
At the midpoint along the bottom rails, when
pulling down on the chain, you should be able to
pull the chain away from the rails, to the distance
where the point of the drive link is "just clearing
the rail" (Fig. 10) and snaps back into place when
you release it.
Fig. 8. Tighten two clutch cover nuts so chain
is at proper tension
Fig. 9 "Sag" chain is too loose
Fig. 10. Proper chain tension - while pulling chain
down, drive links just clearing the rail
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