TM 9-2320-279-34-2
Axles No. 3 and No. 4 Maintenance Instructions (Cont)
10-10. DIFFERENTIAL CARRIER, AXLE NO. 3 (AXLE MODELS 480,580, AND 650) REPAIR
(CONT).
(90) Paint one-third of teeth on ring gear (10) with prussian
blue dye.
(91) Roll ring gear (10) one-third turn, then rock ring gear
forward and backward to set pattern in dye.
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NOTE
A correct gear pattern for a used pinion and ring gear is clear of the toe and
centers evenly along the face of gear tooth, but can be any length and shape
and is acceptable as long as pattern does not run off gear tooth at any point.
If gear pattern was correct at disassembly, then gear pattern after assembly
should be the same.
If pattern is not the same, review steps (79) through (82) and adjust backlash as
required until pattern that was recorded at disassembly is reached.
If pattern was incorrect (pattern runs off gear tooth) at disassembly then, after
assembly, review steps (79) through (82) and adjust backlash as required until
correct gear pattern (pattern does not run off gear teeth) is reached.
Remember, a correct gear pattern for a used pinion and ring gear does not have
to match PATTERN A (correct pattern for new gearing).
NOTE
If new pinion and ring gear .
are used, tooth pattern-should
be like correct pattern A. If
tooth pattern does not look
l
like A, check pattern B
through E to find one that
looks close to ring gear tooth
pattern, then do step that
follows incorrect pattern.
CORRECT PATTERN (NEW GEARING)
10-56
