Chevrolet LIGHT DUTY TRUCK (SERIES 10-35) Service Manual page 373

4 B -1 2 REAR A X L E
DIFFERENTIAL A N D REAR AXLE BEARING DIAGNOSIS
C R A C K E D IN N E R RACE
R AC E C R A C K E D D U E TO IM PR O PER F IT ,
C O C K IN G , OR POOR B E A R IN G S EATS.
R E P LA C E B E A R IN G A N D C O R R E C T B E A R IN G
SEATS.
FRETTAGE
C O R R O S IO N SET UP BY S M A L L R E L A T IV E
M O V E M E N T O F P A R T S W IT H NO L U B R IC A T IO N .
R E P L A C E B E A R IN G . C L E A N R E L A T E D P AR TS.
C H EC K S E A LS A N D C H E C K FOR PROPER L U B R IC A T IO N .
SMEARS
S M E A R IN G O F M E T A L DUE TO S L IP P A G E .
SLIP PA G E C A N BE C A U S E D BY POOR F IT S .
L U B R IC A T IO N , O V E R H E A T IN G , O V E R L O A D S
OR H A N D L IN G D A M A G E .
R E P LA C E B E A R IN G S , C L E A N R E L A T E D PA R TS
A N D C H EC K FOR PROPER F IT S A N D
L U B R IC A T IO N .
LIG H T T R U CK SER V ICE M ANUAL
(C O N T 'D)
FATIG UE
F L A K IN G OF S U R F A C E M E T A L R E S U L T IN G FR O M
F A T IG U E .
R E P L A C E B E A R IN G C L E A N A L L R E L A T E D PAR TS.
STAIN D IS C O L O R A T IO N
D IS C O L O R A T IO N C A N R A N G E FR O M L IG H T BROW N
TO B L A C K C A U S E D BY IN C O R R E C T L U B R IC A N T OR
M O IS T U R E .
RE USE B E A R IN G S IF S T A IN S C A N BE R E M O V E D BY
L IG H T P O L IS H IN G OR IF NO E V ID E N C E O F O V E R ­
H E A T IN G IS O B S E R V E D .
C H EC K S E A LS A N D R E L A T E D PA R T S FOR D A M A G E .
Fig. 4B-1 3--D ifferential and Axle Bearing D iagnosis Chart B
SPALLI G
S U R F A C E IN D E N T A T IO N S IN R A C E W A Y C AU S E D BY
R O L L E R S E IT H E R U N D E R IM P A C T L O A D IN G OR
V IB R A T IO N W H IL E TH E B E A R IN G IS N O T R O T A T IN G .
R E P LA C E B E A R IN G IF R O U G H OR N O IS Y .
H E A T D IS C O L O R A T IO N C A N R A N G E FR O M F A IN T
Y E L L O W TO D A R K B L U E R E S U L T IN G FRO M O V E R
L O A D (W A G O N 'S ) OR IN C O R R E C T L U B R IC A N T .
EXCE S S IV E H E A T C A N C A U S E S O F T E N IN G OF R AC ES
OR R O LLE R S .
TO C H EC K FOR LOSS O F T E M P E R O N R AC ES OR
R O L L E R S A S IM P LE F IL E T E S T M A Y BE M A D E . A
F IL E D R A W N O V E R A T E M P E R E D P A R T W IL L G R A B
A N D C U T M E T A L , W H E R E A S , A F IL E D R A W N O V E R A
H A R D P A R T W IL L G L ID E R E A D IL Y W IT H NO M E T A L
C U T T IN G .
R E P LA C E B E A R IN G S IF O V E R H E A T IN G D A M A G E IS
IN D IC A T E D . C H E C K S E A LS A N D O T H E R PARTS.
BR INELLING
HEAT D ISC O LO R A TIO N