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Special Offer Buy 2 Chains and Get a Free Guide Bar!
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603GC
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Special Offer for 603GC saws
(2) PremiumPRO-25 Diamond Chains
& (1) 10 Inch Guide Bar P/N 517689
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814PRO
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Special Offer for 814PRO saws
(2) PremiumPRO-25 Diamond Chains
& (1) 13 Inch Guide Bar P/N 74042
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Free Ground Freight*
(*most continental U.S. locations)
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IMPORTANT - When Replacing Chains
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How can the same chain be a 10" Chain on a
603GC and a 13" chain on an 814PRO?
On the 603GC's (left) the sprocket assembly sits further back in the
saw than on the 814PRO (right). It's the cutting depth that defines
the bar and chain size, so on the 603GC these chains provide 10"
of cutting depth and on the 814PRO 13" of cutting depth.
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A properly tensioned chain will optimize cutting performance. The tensioning rule of thumb for a
concrete cutting chain saw is: "A properly tensioned diamond chain must not be "bowstring
tight" and can be pulled freely around the guide bar by hand easily without binding.
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PROPER CHAIN TENSION PremiumPRO-25 P/N 74713
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 chew up the chain drive
links. 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.
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How To Check PremiumPRO-25 P/N 74713 Tension
Before cutting, check for proper tension by pulling the chain around the bar by
hand. If you cannot easily pull it by hand the chain is too tight and needs to be
loosened.
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When To Tension PremiumPRO-25 P/N 74713
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. When a chain stretches to a point where the drive links are hanging
approximately 1/2" - 3/4" (12-18mm) below the bar, it's time to tension the
chain.
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How To Tension PremiumPRO-25 P/N 74713
To tension the chain, first loosen the side cove rnuts, then while holding the
nose of the bar up, use a screw driver to turn the tensioning screw clockwise
until the chain drive links hanging below the bar are just beginning to enter the
bar groove. Continue to hold up the nose of the bar and firmly tighten the side
cover nuts, (20-ft-lbs, 27Nm).
And remember, it's the side cover nuts that hold the bar in position.
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How To Prevent Chain Tensioner Breakage with PremiumPRO-25 P/N 71493
Do not attempt to adjust the tensioner without first loosening the side cover nuts. Do not use the saw without
making sure the side cover nuts are tight. If the side cover nuts are not tight, the bar can slip backwards during
cutting and break the tensioner pin..
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Additional Information about PremiumPRO-25 P/N 71493
Concrete cutting chainsaws operate with looser chain tension than wood
chainsaws. It is common especially on gas powered, concrete cutting
chainsaws to have the drive links hang completely out of the bar.
Wood cutting chainsaws use oil to lubricate the chain. The oil makes the
chain very slippery and allows the drive links to fully nest between the teeth of
the drive sprocket. Concrete cutting chainsaws require water for cooling and
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flushing the cut. Water is not as good as oil as a lubricant. Also, there are concrete particles mixed in with the
water. As a result, sometimes the drive links do not nest properly on the drive sprocket. When this
happens, the chain acts like it got tighter. There may seem to be "tight" spots and "loose" spots as you
pull the chain around the bar. If you tension when the chain is in one of the loose spots, it will be tight at
some point in it's rotation around the bar. Rotating the chain completely around the bar by hand will
let you know you have the chain properly tensioned.
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Additional Tensioning Tips for the PremiumPRO-25 P/N 74713:
- To reduce chain stretch and tensioning downtime, use 20 PSI (1.4 bar) or greater water
pressure.
- Oil the chain at the end of the day to prevent rust but be careful not to over tension in this
condition.
- When pulling the chain around the bar by hand, be careful not to touch the bar with thumb
or forefinger. The bar rails can be very sharp. Grab only the diamond segments to pull
the chain.
- Always pull the chain away from the Wallwalker. The point of the Wallwalker can also be
very sharp.
- Always turn the engine off before tensioning the chain.
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