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 TM 9-2330-326-14&P
H-31.
BEARINGS (Cont.)
HEAT DISCOLORATION
STAIN DISCOLORATION
Heat discoloration can range from faint
Discoloration can range from light brown to
yellow to dark blue resulting from
black caused by incorrect lubricant or
overload or incorrect lubricant.
moisture.
Excessive heat can cause softening of
Reuse bearings if stains can be removed by
races or rollers. To check for loss of
light polishing or if no evidence of
temper on races or rollers, a simple file
overheating is observed.
test may be made. A file drawn over a
tempered part will grab and cut metal,
Check seals and related parts for damage.
whereas a file drawn over a hard part will
glide readily with no metal cutting.
Replace bearings if overheating damage
is indicated. Check seals and other
parts.
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