GENERAL
Troubleshooting
WHEEL BEARING TROUBLESHOOTING
Trouble
Pitting
Symptom
Pitting occurs because of uneven rotation of race
and bearing surfaces
Probable cause
Excessive
preload
Excessive load
Flaking
The surface peels because of uneven rotation of
the race and bearing surfaces
End of bearing life
Improper bearing assembly
Cracking
Chipping or cracking of cage or roller edges
Impact when bearing was
installed
as being hit with
a hammer)
Flat spotting
When large load is applied, race and roller
contact surfaces compress, forming
indentations
Excessive bearing preload
Excessive load
Vibration when bearings are not
used, such as during shipment
on freight cars, transport trucks,
etc.
Nicks
Instead of rolling along race surface, rollers
slide, thus damaging surface
Insufficient grease
Excessive bearing preload
Excessive load
Faulty oil seal
Smearing
Damage or wear caused by minute particles
adhering to surfaces results in rough movement
and such high temperatures that parts of surface
melt
Excessive variation of loads on
bearings
Use of grease other than that
specified
Insufficient grease
Rust, corrosion
Appears on
areas of the bearing
Use of grease other than that
specified
Faulty oil seal
Presence of water or moisture
Wear
Wear of surface areas caused by friction
Insufficient grease
Foreign matter
Rust or corrosion due to
moisture
Use of grease other than that
specified
Faulty oil seal
Discoloration
Grease discoloration results from grease
deterioration which causes particles of pigment
contained in grease to adhere to surfaces
Heat discoloration will appear as a deep brown or
purple
Use of grease other than that
specified
Faulty oil seal
Excessive bearing preload
Excessive load
TSB Revision
Содержание 3000GT 1991
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