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A properly tensioned chain will optimize cutting performance. The tensioning rule of thumb for
a concrete cutting chain saw is that a properly tensioned diamond chain must not be bowstring
tight and can be pulled freely around the guide bar by hand easily without binding.
Proper Chain Tension
PROPER CHAIN TENSION
If the chain is too loose, it could come off the bar, or it will
If the chain is too loose, it could come off the bar, or it will allow the drive
allow the drive sprocket spin without turning the chain
sprocket to spin without turning the chain, which can chew up the chain drive
which can damage the chain drivel inks. If the chain is
links. If the chain is too tight, a lot of the saw's power goes into turning the
too tight, much of the saw's power goes into turning the
chain rather than into the cut. In extreme over-tightened cases, the saw may not
chain rather than into the cut. In extreme over-tightened
be able to turn the chain at all. In addition, damage can occur to the bar nose
cases, the saw may not be able to turn the chain at
and premature stretch may occur.
all. In addition, damage can occur to the bar nose and
premature chain stretch may occur.
HOW TO CHECK
Before cutting, check for proper tension by pulling the chain around the bar
by hand. If you cannot easily pull by hand, the chain is too tight and needs to
Before cutting, check for proper tension by pulling the
be loosened.
chain around the bar by hand. If you cannon easily pull by
hand, the chain is too tight and needs to be loosened.
WHEN TO TENSION
All chains have a tendency to stretch when used.
All chains have a tendency to stretch when used. Diamond chains stretch
Diamond chains stretch more than wood cutting chains
more than wood cutting chains because of the abrasive materials they are
because of the abrasive materials they are cutting. When
cutting. When a chain stretches to a point where the drive links are hanging
a chain stretches to a point where the drive links are
approximately 1/2 in- 3/4 in (12 - 18 mm)below the bar, it's time to tension
hanging approximately 1/2 inch to 3/4 inch below the
the chain.
bar, it's time to tension the chain.
HOW TO TENSION
To tension the chain, first loosen the side cover nuts, then
To tension the chain, first loosen the side cover nuts, then while holding the nose of
while holding the nose of the bar up, use a screwdriver to
the bar up, use a screw driver to turn the tensioning screw clockwise until the chain
turn the tensioning screw clockwise until the chain drive
drive links hanging below the bar are just beginning to enter the bar groove. Continue
links hanging below the bar are just beginning to enter
to hold up on the nose of the bar and firmly tighten the side cover nuts, (20 ft-lbs,
the bar groove. Continue to hold up on the nose of the bar
27 Nm). And remember, it's the side cover nuts that hold the bar in position.
and firmly tighten the side cover nuts. And remember, it's
the side cover nuts that hold the bar in position.
HOW TO PREVENT CHAIN TENSIONER BREAKAGE
Do not attempt to adjust the tensioner without first loosening the side cover nuts. Do
How to Prevent Chain Tensioner Breakage
not use the saw without making sure the side cover nuts are tight. If the side cover nuts
Do not attempt to adjust the tensioner without first
are not tight, the bar can slip backwards during cutting and break the tensioner pin.
loosening the side cover nuts. Do not use the saw without
making sure the side cover nuts are tight. If side cover
nuts are not tight, the bar can slip backwards during
cutting and break the tensioner pin.
CAUTION
CHAIN TENSION
IMPORTANT
I M P O RTA N T
I M P O RTA N T
I M P O RTA N T
THE FOLLOWING SYMBOLS & LABELS MAY BE FOUND
I M P O RTA N T
I M P O RTA N T
How To Check
When to Tension
How to Tension
Air Powered Chain Saw
A potentially hazardou
avoided, may result in
property damage.
A potentially hazardou
avoided, may result in
Read the operator's manual carefu
contents before you use this equipm
correct chain tension
Always wear a protective helmet
correct chain tension
correct chain tension
correct chain tension
chain
chain
Always wear breathing protection
chain
too tight
too loose
correct chain tension
too loose
chain
chain
too tight
too loose
chain
chain
too tight
too loose
Always wear hearing protection
chain
chain
too tight
too loose
Always wear protective glasses or f
Always use ground fault protection
chain
too tight
8
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