© 2014 ICS, Blount International Inc. Specifications are subject to change without notice. REV021414 F/N 566100
890 SERIES OPERATOR’S MANUAL
10
STEP 9
Lift up on the nose of the bar and
firmly tighten the side cover nuts. To
prevent chain tensioner breakage,
be sure the side cover nuts are
tightened to approximately 20 ft-lbs
(27 Nm).
CORRECT CHAIN TENSION
All chains have a tendency to
stretch when used. Diamond chains
stretch more than wood cutting
chains because of the abrasive
materials they are cutting.
If the chain is too tight, a lot of the
saw's power goes into turning the
chain rather than into the cut. In
extreme over-tightened cases, the
saw may not be able to turn the
chain at all. In addition, damage
can occur to the bar nose and
premature stretch may occur.
CHAIN TOO LOOSE
If the chain is too loose, it could
come off the bar, or it will allow
the drive sprocket to spin without
turning the chain, which can
damage drive links.
When a chain stretches to a point
where the drive links are hanging
approximately 1/2 in (12 mm) to 3/4
in (18 mm) below the bar, it is time
to tension the chain.
CHAIN TOO TIGHT
CHAIN TOO LOOSE
STEP 8
Tension the chain. Do not over
tension the diamond chain. Loss of
power will result.
SET-UP
CORRECT CHAIN TENSION
