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© 2017 ICS®, Blount International Inc. REV072517 P/N 566594
890F4 OPERATOR MANUAL
27
Operation
CUTTING TIPS
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For the straightest cuts use the “Step Cut” method:
•
First score the entire cut line approximately a half-inch deep using
the nose of the guidebar.
•
Next, deepen the cut by about two inches
•
Then plunge all the way through and complete the cut using the
WallWalker® as a pivot point and pull on the rear handle to rotate
the bar into the cut.
•
When the WallWalker is extended in the mechanical mode, the Wall Walker
provides a 4:1 mechanical advantage.
•
Always operate the concrete power cutter at full throttle. If too much force
is applied, the power cutter will lug or stall. The chain will not have enough
speed to cut effectively. If too little feed force is applied, the diamonds will
skid and glaze over.
•
Plunge cut instead of starting at the top surface of the wall. This will
reduce chatter, extend diamond life, create a straighter cut and more
quickly enable the use of the WallWalker.
•
When cutting heavy rebar, slowly “rock” the power cutter so that you’re
always cutting concrete as well as steel. This will help keep the diamonds
exposed. Also, expect less chain life when cutting heavy rebar.
•
Expect more chain stretch when making nose-buried cuts for extende
periods of time, as the chain does not have a chance to “throw” the slurry
away from the nose of the guidebar (use step cut method).
•
If the power cutter begins to cut consistently crooked, stop the power
cutter, remove the bar and chain and turn the bar over and use the other
side. Dress worn rails with a belt sander, flat file or bar rail dresser.
Note: The normal life of a guidebar is two to three diamond chains (with
rotation after every chain). Heavy rebar can shorten guidebar life.
•
The guidebar is solely a guide track for the chain. Never use the guidebar
to lift, twist or pry concrete material.
•
When using a new chain, you can increase the initial cutting speed by
“opening up the diamonds”. This can be accomplished by first making a
few cuts in an abrasive material such as a cinder block or brick.