Heat Discoloration
Heat discoloration can range from faint yellow to
dark blue resulting from overload or incorrect
lubrication.
Excessive heat can cause softening of races or
rollers.
To check for loss of temper on races or rollers, a
simple file test may be made. A file drawn over a
tempered part will grab and cut metal, whereas a file
drawn over a hard part will glide readily with no
metal cutting.
Replace bearing if over heating damage is indicated.
Check seals and other related parts for damage.
Stain Discoloration
Discoloration can range from light brown to black
caused by incorrect lubrication or moisture.
if the stain can be removed by light polishing or if no
evidence of overheating is visible, the bearing can
be reused.
Check seals and other related parts for damage.
General Maintenance Procedures S0302000
Page 13
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