S0302000
Page 13
General Maintenance Procedures
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Heat Discoloration
Heat discoloration can range from faint yellow to
dark b lue r esulting fr om o verload o r incorrect
lubrication.
Excessive heat can cause softening of r aces 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 fil e dr awn over a har d pa rt wi ll glide r eadily
with no metal cutting.
Replace bea ring if o ver heating damage is
indicated. Chec k seals and othe r r elated par ts
for damage.
Stain Discoloration
Discoloration c an r ange fr om light br own t o
black ca used b y in correct l ubrication o r
moisture.
if the stain can be r emoved by light polishing or
if n o e vidence o f o verheating is v isible, th e
bearing can be reused.
Check seals and other related parts for damage.
Figure 17
Figure 18
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