GMC 1986 P-Truck Service Manual page 293

MISALIGNMENT
Outer race m isalignm ent due to foreign ob­
ject.
Clean related parts and replace bearing. Make
sure races are properly seated.
FATIGUE SPALLING
Flaking of surface metal resulting from fa­
tigue.
Replace bearing, clean all related parts.
Figure 4—Diagnosis Of Front Wheel Bearings
FRONT SUSPENSION 3C-7
CRACKED INNER RACE
Race cracked due to improper fit, cocking, or
poor bearing seats.
Replace bearing and correct bearing seats.
BRINELLING
Surface indentations in raceway caused by
rollers either under impact loading or vibra­
tion while the bearing is not rotating.
Replace bearing if rough or noisy.
B-09860