SECTION 58 - ATTACHMENTS / HEADERS - CHAPTER 1
58-10
CUTTER BAR INSPECTION/FAILURE
ANALYSIS
In the event of a failure of the modular disc cutter bar,
it is important to properly inspect the unit to
determine the extent of the damage. A thorough
examination will help to locate all the damaged
components, and minimize unnecessary repair
labour. Often, it may not be necessary to remove and
disassemble the cutter bar to repair or replace the
failed components.
If a cutter bar failure is experienced, check the cutter
bar components in the following sequence:
A. Inspect the externalcomponents for damage,
paying particular attention to the knives, 1,
lifters, 2, and discs, 3. Broken knives and bent
or cracked discs and lifters are a result of contact
with solid foreign objects, and may indicate
possible internal damage. A disc out of time may
also indicate internal damage; the discs are
properly timed when they are positioned 90° to
each other as shown.
WARNING
Disengage the PTO, turn off the tractor engine
and remove the key. Wait for all movement to
stop before leaving operator’s position. Never
adjust, lubricate, clean or unplug machine with
the engine running. Failure to comply could
result in death or serious injury.
Misalignment or gaps between the disc modules
and spacers may indicate the tie bolts are loose
or broken, or the dowel pins between the
components have failed or are missing.
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B. Carefully grab both ends of each disc, and try
to “rock” the disc up and down. Asmall
amount of movement 1.5 mm (0.060 in) is
normal; an excessive amount of movement may
be the result of a loose disc hub retaining bolt, or
could indicate a worn top cap housing or
bearings. Disc modules with excessive disc
“rock” should have the disc retaining bolts and
disc hub bolt checked for proper torque. Replace
the disc hub retaining bolt if it has loosened; the
bolt is equipped with a locking agent. If the bolts
are tight, and movement still exists, the top cap
assembly may need to be replaced.
CAUTION
The bottom leading edge of worn discs can
become very sharp; wear gloves to prevent
injury. Failure to comply could cause personal
injury.
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