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Fig. 12 Model 70 Axle Differential—Exploded
View
D o
not steam c l e a n the differential
compo-
nents.
(2) To clean the axle shaft tubes (Figs. 1 and 2), i n -
sert a stiff w i r e i n t o each tube, a t t a c h a clean cloth
to t h e w i r e at the differential housing opening and
w i t h d r a w the w i r e (and cloth) from t h e housing out-
w a r d t h r o u g h the tube.
(3) Inspect the differential bearings and the drive
p i n i o n gear shaft bearings, and the differential case
and housing (Figs. 11 and 12):
• the differential bearings and the drive p i n i o n gear
shaft front and rear bearings and cups should have a
smooth appearance w i t h no broken/dented
surfaces
on the bearing rollers or the roller contact surfaces;
• the bearing races m u s t not be distorted or cracked;
I f a differential b e a r i n g m u s t be r e p l a c e d , the
c u p a n d the b e a r i n g
m u s t be
r e p l a c e d a s
a
" m a t c h e d s e t " only.
• a l l the machined contact surfaces i n the differen-
t i a l housing and on the differential bearing caps
should be smooth and w i t h o u t any raised edges;
• the drive p i n i o n gear shaft front and rear bearing
cup bores
i n the differential housing should be
smooth; and
• i f i t exists, raised m e t a l on the shoulders of the
bearing cup bores i n c u r r e d d u r i n g removal of the
cups should be removed w i t h a h a n d stone.
(4)
Examine
the differential p i n i o n gear
mate
shaft, p i n i o n gears, side gears a n d t h r u s t washers
(Figs. 11 a n d 12) for wear and damage. Replace a l l
defective components.
I f e i t h e r of the differential p i n i o n g e a r s is not
r e u s a b l e ,
b o t h
gears
m u s t b e
r e p l a c e d
a s
a
" m a t c h e d s e t " only. D o not r e p l a c e only
one
gear.
(5) E x a m i n e t h e r i n g gear a n d t h e drive p i n i o n
gear shaft (Figs. 11 and 12) for w o r n and chipped
teeth. E x a m i n e t h e r i n g gear for damaged a t t a c h i n g
bolt threads.
I f r e p l a c e m e n t of either g e a r i s n e c e s s a r y , b o t h
the r i n g g e a r a n d the d r i v e p i n i o n g e a r shaft
m u s t be r e p l a c e d b e c a u s e they a r e a v a i l a b l e a s
a " m a t c h e d s e t " s only.
(6) Inspect t h e drive p i n i o n gear shaft (axle) yoke
(Figs. 11 a n d 12) for cracks, w o r n splines, " p i t t e d " ar-
eas, a n d a rough/corroded seal contact surface. Re-
pair or replace the yoke as necessary.
(7) Inspect t h e drive p i n i o n gear shaft bearing "pre-
load" torque shims (Figs. 11 and 12) for cracks, dam-
age
and d i s t o r t i o n . I n s t a l l replacement
shims ( i f
necessary) for t h e "preload" torque adjustment.
(8) Inspect t h e R W A L brake exciter r i n g for dam-
age a n d m i s s i n g teeth. I f i n s t a l l e d , ensure t h a t the
r i n g is f i r m l y pressed onto the differential case. Re-
place t h e r i n g i f i t is either loose or damaged.
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