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© 2005 Alamo Group Inc.
Section 7 - 4
Switch Blade (JD-5105-5205-5225-5325-5425-5525, Asy. Man) 05/05
CUTTER BAR ADJUSTMENTS
Figure 7
Clips:
After all guards are adjusted, it is necessary
to see that the knife clips are bent down to within 1/
64" of the section. The easiest way to check this is
to hold the knife down on the ledger plate and use a
feeler gauge or the cover of a paper match book to
measure the clearance. Do not attempt to hold the
tightly against the ledger plate with the clips. Knock
the clips down with a hammer. A light blow with
hammer is all that is required. If the clips drag on the
knife, pry them up. Drag will bind the knife and wear
the clip very rapidly (See Figure 7 & 8).
Knife Repair:
ALWAYS USE A SHARP KNIFE. A dull knife
cuts poorly, may plug and doesn't do a clean job.
Keep the knife straight with the sections firmly
riveted to the knife back. When sharpening knife, be
careful to restore the original shear angle and bevel
of 23 °. Properly and improperly ground knife sec-
tions are shown (See Figure 9). A knife section that
has been ground several times may have the proper
angle and bevel and still be unserviceable because
the hard cutting edge has been ground away and the
section is to short to cut everything encountered.
Knife Replacement:
Replace worn or broken knife sections.
Alamo Industrial knife sections are heavy duty sec-
tions made of special steel and will stay sharp for
many more hours than conventional sections.
Figure 8
Clips
Clips
Match Book Cover
New Sections -
proper bevel and
angle for good work.
Improperly ground sec-
tions - narrow bevel
and wrong angle which
changes the angle of
shear.
properly ground sec-
tions even after re-
peated griding, proper
bevel and angle are
retained.
Sections ground off
center, destroying the
register of blade in
guard.
Figure 9