Differential And Rear Axle Bearing Diagnosis - Chevrolet 1981 Light Duty Truck Service Manual

4B-12 REAR AXLE
DIFFERENTIAL A N D REAR AXLE BEARING DIAGNOSIS
A B R A S I V E R O L L E R
PATTERN ON RACES AND ROLLERS CAUSED BY
FINE ABRASIVES.
CLEAN ALL PARTS AND HOUSINGS. CHECK SEALS
AND BEARINGS AND REPLACE IF LEAKING, ROUGH
OR NOISY.
A B R A S I V E S T E P W E A R
PATTERN ON ROLLER ENDS CAUSED BY
FINE ABRASIVES.
CLEAN ALL PARTS AND HOUSINGS. CHECK SEALS
AND BEARINGS AND REPLACE IF LEAKING, ROUGH
OR NOISY.
//Ill w
I N D E N T A T I O N S
SURFACE DEPRESSIONS ON RACE AND ROLLERS
CAUSED BY HARD PARTICLES OF FOREIGN MATERIAL.
CLEAN ALL PARTS AND HOUSINGS. CHECK SEALS
AND REPLACE BEARINGS IF ROUGH OR NOISY.
LIGHT TRUCK SERVICE MANUAL
CONSIDER THE FOLLOWING FACTORS WHEN DIAGNOSING BEARING CONDITION:
1. GENERAL CONDITION OF ALL PARTS DURING DISASSEMBLY AND INSPECTION.
2. CLASSIFY THE FAILURE WITH THE AID OF THE ILLUSTRATIONS.
3. DETERMINE THE CAUSE.
4. MAKE ALL REPAIRS FOLLOWING RECOMMENDED PROCEDURES.
G A L L I N G
W E A R
METAL SMEARS ON ROLLER ENDS DUE TO OVERHEAT,
LUBRICANT FAILURE OR OVERLOAD (WAGON'S)
REPLACE BEARING CHECK SEALS AND CHECK
FOR PROPER LUBRICATION.
E T C H I N G
BEARING SURFACES APPEAR GRAY OR GRAYISH
BLACK IN COLOR WITH RELATED ETCHING AWAY
OF MATERIAL USUALLY AT ROLLER SPACING.
REPLACE BEARINGS
FOR PROPER LUBRICATION.
C A G E
WEAR AROUND OUTSIDE DIAMETER OF CAGE AND
ROLLER POCKETS CAUSED BY ABRASIVE MATERIAL
AND INEFFICIENT LUBRICATION.
CLEAN RELATED PARTS AND HOUSINGS.
CHECK SEALS AND REPLACE BEARINGS.
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Fig. 4B-12-Differential and Axle Bearing Diagnosis Chart A
CAGE DAMAGE DUE TO IMPROPER HANDLING
OR TOOL USAGE.
REPLACE BEARING.
CAGE DAMAGE DUE TO IMPROPER HANDLING
OR TOOL USAGE.
REPLACE BEARING.
CHECK SEALS AND CHECK
W E A R
OUTER RACE MISALIGNMENT DUE TO FOREIGN
OBJECT.
CLEAN RELATED PARTS AND REPLACE BEARING.
MAKE SURE RACES ARE PROPERLY SEATED.
U i l &
B E N T C A G E
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B E N T C A G E
M I S A L I G N M E N T