Front Wheel Bearing Diagnosis - Pontiac TRANS AM 1977 Service Manual

STEERING, SUSPENSION, WHEELS A N D TIRES
3-1
3
FRONT WHEEL BEARING DIAGNOSIS
CONSIDER THE FOLLOWING FACTORS WHEN DIAGNOSING BEARING COIY)ITIOII
1
GENERAL C W D I T l O U OF ALL PARTS DURING DISASSEMBLV AND INSPECTION
2 CL*U)IFV THE FAILURE WITH THE AIDOF THE ILLUSTRATIONS
3
DETERMlNE THE CAUSE
4 MAKE ALL REPAIRS FOLLOWNG RECOMMENDED PROCEWRES
ABRASIVE ROLLER WEAR
PATTERN ON RACES AND ROLLERS CAUSED BV
I I N f ABRASIVES
CLEAN ALL PARTSAND HOUSINGS CHECK SEALS
A N 0 ALARINGS A N 0 REPLACE I F LEAKING, R W G H
OR NOISY
ABRASIVE STEP WEAR
PATTERN ON ROLLER ENDS CAUSED BV
FINE 4BRASlVES
CLEAN ALL P A R ~ S AND H O ~ I N C S CHECK SEALS
AND BEARINGSANO REPLACE IF LEAKING. R W G H
INDENTATIONS
SURFACE DEPRESSIONS ON RACE AND ROLLERS
CAUSE0 BV IiARDCARTlCLLSOF FOREIGN MATERIAL
CLEAN h L L PARTS ANDHOUSINGS CHECK SEALS
AND REPLACE DEARlNGS IF ROUGH OR NOISV
G A L L I N G
METAL SMEARSOU ROLLER ENDSDUE TO OVERHEAT
LUBRICANT FAILURE OR OVERLOAD (WAGON'S)
REPLACE BEARING - CHECK SEALS AND CHECK
FOR PRWER L U B R E A T I W .
ETCHING
BEARING SURFACES W E A R GRAY OR GRAYISH
BLACK IN COLM
w m
RELATED ETCHING AWAY
OF MATERIAL USUALLY AT ROLLER SPACING
REPLACE BEARINGS CHECK SEALS ANDCHECK
FOR PROPER LUBRICATION.
C A G E WEAR
WEAR AROUND W T S l D E DIAMETER OF CAGE AND
ROLLER POCKETS CAUSED BY ABRASIVE MATERIAL
U D INEFFICIENT LUBRICATION.
CLEAN RELATED PARTS AND HOUSINGS
CHECK W A L S AND REPLACE BEARINGS.
BENT CAGE
CAGE DAMAGE DUE TO IMPROPER HANDLING
OR TOOL USAGE
REPLACE BEARING
BENT CAGE
CAGE DAMAGE DUE 1 0 IMPROPER WANOLIING
OR TOOL USAGE
REPLACE BEARING
MISALIGNMENT
OUTER RACE MISALIONMENT
CLEAN RELATE0 PARTS AND REPLACE BLARING
MAKE SURE RACES ARE PROPERLY SEATED
Fig. 3-10 Front Wheel Bearing Diagnosis