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REAR AXLES
3 - 1 5
b e a r i n g " p r e l o a d " t o r q u e m u s t b e c a r e f u l l y r e -
a d j u s t e d a f t e r t h e r e p l a c e m e n t seal i s i n s t a l l e d .
(6) R e t a i n (axle) yoke w i t h H o l d i n g Tool C-3281
and remove
drive p i n i o n gear shaft n u t a n d t h e
" B e l l e v i l l e " washer.
(7) Remove t h e yoke w i t h Yoke Removal Tool C-
452.
(8) Lower t h e rear of the vehicle t o prevent l u b r i -
cation leakage.
(9) Remove t h e drive p i n i o n gear shaft seal f r o m
the differential housing w i t h a s m a l l p r y b a r a n d a
hammer. Clean t h e seal contact surface i n t h e hous-
ing.
INSTALLATION
(1) E x a m i n e t h e splines a t the end of the drive p i n -
ion gear shaft t o ensure t h a t they are w i t h o u t burrs
and are n o t w o r n excessively.
(2) I f b u r r s do exist, remove t h e m w i t h crocus cloth
by m o v i n g i t w i t h a r o t a t i o n a l motion. Clean t h e
drive p i n i o n gear shaft w i t h a clean shop cloth.
(3) Inspect t h e drive p i n i o n gear shaft (axle) yoke
for cracks, w o r n splines and w o r n seal contact sur-
face. Repair or replace t h e (axle) yoke as necessary.
T h e o u t e r p e r i m e t e r o f t h e seal i s p r e - c o a t e d
w i t h a s p e c i a l s e a l a n t , t h e r e f o r e a n a p p l i c a t i o n
o f s e a l a n t i s n o t r e q u i r e d .
(4) I n s t a l l t h e replacement drive p i n i o n gear shaft
seal (Fig. 10).
Use S e a l I n s t a l l a t i o n T o o l C-4076 f o r 8 3/8-inch
d i a m e t e r r i n g g e a r axles. U s e Seal I n s t a l l a t i o n
T o o l C-3980 o r C-4109 f o r 9 1/4-inch d i a m e t e r
r i n g g e a r a x l e s . T h e seal i s c o r r e c t l y i n s t a l l e d
w h e n t h e seal f l a n g e c o n t a c t s t h e face o f t h e d i f -
f e r e n t i a l h o u s i n g f l a n g e .
Fig. 10 Drive Pinion Gear Shaft Seal Installation
(5) Position t h e drive p i n i o n gear shaft (axle) yoke
on t h e e n d o f t h e shaft w i t h t h e i n s t a l l a t i o n refer-
ence m a r k s aligned.
(6) "Seat" t h e (axle) yoke on t h e drive p i n i o n gear
shaft w i t h Tool C-3718 and H o l d i n g Tool C-3281.
(7) Remove t h e tools a n d i n s t a l l t h e " B e l l e v i l l e "
washer (the convex side of t h e washer m u s t face out-
ward) and t h e drive p i n i o n gear shaft n u t .
(8) R e t a i n t h e drive p i n i o n gear shaft (axle) yoke
w i t h H o l d i n g Tool C-3281 and t i g h t e n t h e shaft n u t
w i t h 285 N*m (210 ft-lbs) torque (Fig. 11). Rotate t h e
drive p i n i o n gear shaft several complete revolutions
to ensure t h a t t h e b e a r i n g rollers are "seated".
Fig. 11 Tightening Drive Pinion Gear Shaft Nut
Use a N e w t o n - m e t e r o r a n i n c h - p o u n d t o r q u e
w r e n c h (e.g., C-685-A) t o m e a s u r e t h e d r i v e p i n -
i o n g e a r s h a f t b e a r i n g " p r e l o a d " t o r q u e .
CAUTION: Never loosen the drive pinion gear shaft
nut to decrease the drive pinion gear shaft bearing
"preload" torque. If the specified "preload" torque
is exceeded, a replacement collapsible spacer must
be installed and the nut re-tightened until the spec-
ified bearing "preload" torque is obtained.
(9) Continue a l t e r n a t e l y t i g h t e n i n g t h e drive p i n -
ion gear shaft n u t a n d measuring the bearing "pre-
load" torque u n t i l t h e torque is t h e same as t h a t
measured a n d recorded p r i o r to yoke a n d seal r e -
moval.
T h e b e a r i n g
" p r e l o a d "
t o r q u e
s h o u l d
n e v e r b e g r e a t e r t h a n 1 N * m (10 i n - l b s ) m o r e
t h a n t h e r e c o r d e d a m o u n t .
T h e b e a r i n g " p r e l o a d " t o r q u e s h o u l d b e c o n -
s t a n t d u r i n g a c o m p l e t e r e v o l u t i o n o f t h e d r i v e
p i n i o n g e a r s h a f t . I f t h e " p r e l o a d " t o r q u e v a r i e s
d u r i n g r o t a t i o n o f t h e s h a f t , t h i s i n d i c a t e s a n i n -
t e r n a l " b i n d i n g " c o n d i t i o n a n d i t m u s t b e c o r -
r e c t e d b e f o r e c o n t i n u i n g w i t h t h e i n s t a l l a t i o n o f
t h e d r i v e s h a f t .
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