Mitsubishi 1989-1993 GALANT Service Manual page 35

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