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 TM 9-2330-326-14&P
H-31.
BEARINGS (Cont.)
Impact Loads
Dents across the race indicate a sharp,
Dents caused by impact loads may
high impact. Cause could be hitting pot
progress to spalled or galled tracks across
holes
or
excessive
installation
the surface.
pressure.
Other Damage
Fretting corrosion of th e outer surface
Overheated bearing metal goes from a
is often the result of a loose fitting
straw-brown at 300F (149C) to a deep
bearing. Probable cause: a worn hub
purple at over 700F (371C). The causes
or spindle.
are lack of lube, misadjustment, or
excessive loading.
Spalling occurs as fatigued metal lifts
Light pitting can be caused by electrical
off the surface. This can be the normal
arcing. The probable cause is electrical
end
of
bearing
life,
improper
welding grounded through the axle.
lubrication, or excessive loading.
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