SECTION 58 - ATTACHMENTS / HEADERS - CHAPTER 1
58-11
C. Starting at the left end of the cutter bar, grab
both the #1 and #2 discs, and slowly rotate
both discs while applying pressure to one of
the discs against the direction of rotation. If
one disc suddenly moves, it may indicate
damage to the gear teeth in that module.
Excessive free play between discs, or if one disc
may be turned freely without the other disc
moving, may indicate excessive wear or failure of
the intermodule shaft. Some rotational free play
4.7 mm (3/16 in) between adjacent discs is
normal, as a result of the backlash in both gear
sets.
Check all disc modules by working across the
cutter bar, checking each disc to the next disc. In
some cases, two adjacent modules may sustain
damage from the same event, or there may be
two separate failures on the cutter bar, involving
modules in different locations.
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D. After checking all disc modules for evidence
of internal failure, remove the discs and top
cap assemblies of any module with sus-
pected damage. Inspect both the top cap
assembly and the lower module assembly for
bearing play or damage, and gear tooth damage.
Grab the pinion shaft, and rotate the adjacent
discs to check for play in the intermodule shaft
splines. If only the top cap assembly components
are damaged, it is not necessary to disassemble
the cutter bar further. Before installing the
replacement top cap assembly, drain the oil,
flush the lower module with a cleaning solvent to
remove contaminants and install fresh API GL5
80W90 oil.
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