U.S.SAWS ACH GB Series Operating Manual page 7

633GC / 633F4 OPERATOR'S MANUAL
CORRECT CHAIN TENSION
All chains have a tendency to stretch when
used. Diamond chains stretch more than
wood cutting chains because of the abra-
sive materials they are cutting.
** As measured without pulling
If the chain is too tight, much of the saw's
power goes to turning the chain rather
than into the cut. In extreme over-tight-
STEP 7
ened cases, the saw may not be able to
All chains have a tendency to stretch
turn the chain at all. In addition, damage
when used. Diamond chains stretch more
than wood cutting chains because of the
abrasive materials they are cutting. When
a chain stretches to a point where the drive
links are hanging approximately 1/2"
(12 mm) to 3/4" (18 mm)** below the bar,
it's time to tension the chain. See Note 2.
If the chain is too loose, it could come off
STEP 8
the bar, or it will allow the drive sprocket
Before cutting, check for proper tension by
to spin without turning the chain which
pulling the chain around the bar by hand. If
can damage drive links.
you cannot easily pull by hand, the chain is
When a chain stretches to a point where
too tight and needs to be loosened a little.
the drive links are hanging approximately
See Note 3.
1/2 in (12mm) to 3/4 in (18mm) below
the bar, it is time to replace the chain even
if there seems to be usable segment left.
© 2011 ICS, Blount Inc.
The chain typically determines life rather
than the segments wear.
Guide Bar and Diamond Chain Installation
3/4" (18 mm)**
downward (eg. hanging by gravity)
CHAIN TOO LOOSE
SET-UP
STEP 7
Continue to lift up on the nose of the guide
bar and firmly tighten the side cover nut.
NOTE: To prevent chain tensioner
breakage, be sure the side cover nut is
tightened to approximately 20-25 ft-lbs
STEP 8
Attach to water source with pressure not
less than 20 psi.
removing links. This is not an option for
F/N 70944 May 2011
Air Powered Chain Saw
THE FOLLOWING SYMBOLS AND DEFINITIONS
MANUAL AND ARE DESIGNED TO MAKE YOU AW
WARNING
Never attempt to shorten chain by
CAUTION
extending tool life.
IMPORTANT
THE FOLLOWING SYMBOLS & LABELS MAY BE FOUN
Symbols & L
UNSAFE PRACTIC
A potentially hazard
avoided, could resul
A potentially hazard
avoided, may result
property damage.
A potentially hazard
7
avoided, may result
Read the operator's manual car