Front Suspension - Chevrolet Light Duty Truck 1973 Service Manual

3 -3 6 FRONT SUSPENSION

FRONT WHEEL BEARING DIAGNOSIS
C R A C K E D I N N E R RACE
RACE CRACKED DUE TO IMPROPER FIT,
COCKING, OR POOR BEARING SEATS.
REPLACE BEARING AND CORRECT BEARING
SEATS.
FRETTAGE
CORROSION SET UP BY SMALL RELATIVE
MOVEMENT OF PARTS WITH NO LUBRICATION.
REPLACE BEARING. CLEAN RELATED PARTS.
CHECK SEALS AND CHECK FOR PROPER LUBRICATION.
SMEARS
SMEARING OF METAL DUE TO SLIPPAGE.
SLIPPAGE CAN BE CAUSED BY POOR FITS.
LUBRICATION, OVERHEATING, OVERLOADS
OR HANDLING DAMAGE.
REPLACE BEARINGS, CLEAN RELATED PARTS
AND CHECK FOR PROPER FITS AND
LUBRICATION
FATI GUE S P A L L I N G
FLAKING OF SURFACE M ETAL RESULTING FROM
FATIGUE
REPLACE BEARING - CLEAN A L L RELATED PARTS.
STAI N D I S COL OR AT I ON
DISCOLORATION CAN RANGE FROM LIGHT BROWN
TO BLACK CAUSED BY INCORRECT LUBRICANT OR
MOISTURE.
RE USE BEARINGS IF STAINS CAN BE REMOVED BY
LIGHT POLISHING OR IF NO EVIDENCE OF OVER
HEATING IS OBSERVED.
CHECK SEALS AND RELATED PARTS FOR DAMAGE.
Fig. 49—Bearing Diagnosis
(CONT'D)
BRINELLI NG
SURFACE INDENTATIONS IN RACEWAY CAUSED BY
ROLLERS EITHER UNDER IMPACT LOADING OR
VIBRATIO N WHILE THE BEARING IS NOT ROTATING.
REPLACE BEARING IF ROUGH OR NOISY.
HEAT DI SCOLORATI ON
HEAT DISCOLORATION CAN RANGE FROM FAINT
YELLOW TO DARK BLUE RESULTING FROM OVER
LOAD OR INCORRECT LUBRICANT.
EXCESSIVE HEAT CAN CAUSE SOFTENING OF RACES
OR ROLLERS.
TO CHECK FOR LOSS OF TEMPER ON RACES OR
ROLLERS A SIMPLE FILE TEST MAY BE MADE. A
FILE DRAWN OVER A TEMPERED PART W ILL GRAB
AND CUT METAL, WHEREAS, A FILE DRAWN OVER A
HARD PART W ILL G LIDE RE A DILY WITH NO METAL
CUTTING.
REPLACE BEARINGS IF OVER HEATING DAMAGE IS
INDICATED. CHECK SEALS AND OTHER PARTS.
LIGHT DUTY TRUCK SERVICE MANUAL