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13B
REAR AXLE—Service Information
2.
I n s t a l l d r i v e p i n i o n a n d bearings i n differential carrier,
b e i n g sure t o i n s t a l l the s p a c i n g shims between the
front
b e a r i n g retainer a n d the front e n d of the differential carrier.
M a k e a n i n i t i a l adjustment o n the d r i v e p i n i o n as explained
in section " A d j u s t m e n t of D r i v e P i n i o n . "
Tighten b e a r i n g
r e t a i n i n g n u t s o n the front end of the d r i v e p i n i o n shaft a n d
lock t h e m in p o s i t i o n .
N O T E — L u b r i c a t e the d r i v e p i n i o n bearings when i n s t a l l i n g
t h e m to insure i n i t i a l l u b r i c a t i o n .
3.
Install differential side gears a n d p i n i o n s ( p r o v i d e d these
gears were r e m o v e d ) .
4.
Install r i n g gear o n differential case.
T i g h t e n r e t a i n i n g
screws securely u s i n g a n 18-inch w r e n c h a n d lock w i t h w i r e .
W i r e t w o screws together, i n s t a l l i n g the w i r e i n s u c h a w a y
t h a t tension o f the w i r e o n the screws w i l l t e n d t o tighten the
screws rather t h a n loosen t h e m .
5.
Install differential u n i t in position in differential carrier,
after w h i c h i n s t a l l the adjuster rings a n d the b e a r i n g caps.
6. M a k e i n i t i a l adjustment
of gear mesh.
See section
" A d j u s t m e n t of R i n g G e a r . "
7.
Install the axle shafts, l u b r i c a t i n g the felt washers i n
the wheel.
8.
Install rear axle u n d e r car.
9. A d j u s t gear mesh as e x p l a i n e d under " T e s t i n g R i n g
G e a r for P r o p e r T o o t h C o n t a c t . "
10.
Install reinforcement plate, differential c o v e r a n d
fill
differential t o p r o p e r level w i t h recommended transmission
a n d rear axle l u b r i c a n t .
A d j u s t m e n t of G e a r M e s h
In the design o f the rear axle p r o v i s i o n is made for adjusting
the d r i v e p i n i o n a n d r i n g gear so t h a t the teeth m a y be meshed
correctly, a n d for l o c k i n g a l l adjustments securely.
O r d i n a r i l y
old gears t h a t h a v e been r u n n i n g noisy for some time cannot
be adjusted satisfactorily t o e l i m i n a t e the noise.
I n s u c h
cases it is necessary to replace the gears w i t h n e w ones.
A r i n g gear a n d d r i v e p i n i o n are s h o w n i n F i g . 3 P l a t e 3 A ,
set in the proper r u n n i n g position, a n d in this position a l l
t o o t h dimensions, theoretically, converge
to cone centers
F i g .
1.
C h e c k i n g a d j u s t m e n t of differ-
e n t i a l side bearings.
A p u l l of 8 to 10
p o u n d s s h o u l d be required to t u r n
the
r i n g gear.
F i g . 2.
C h e c k i n g b a c k l a s h between r i n g
gear a n d drive p i n i o n w i t h d i a l i n d i c a t o r
a n d holder, T o o l N o . HM-91220.
B a c k -
l a s h s h o u l d be .004 to .012 i n .
" A . "
In this p o s i t i o n , o n l y the p i t c h lines o f the r i n g gear
a n d d r i v e p i n i o n c o i n c i d e ; a n d a l t h o u g h a l l o t h e r p r o p o r t i o n s
of t o o t h shape converge t o w a r d the cone centers of the gears,
they are in no place p a r a l l e l t o the p i t c h line.
I t is, therefore, e v i d e n t t h a t the s h i f t i n g o f gears from the
correct p o s i t i o n , results i n t h r o w i n g the p i t c h lines o u t o f
p a r a l l e l a n d c h a n g i n g the c o n t a c t o f the gear a n d p i n i o n from
a full contact t o w a r d either the toe o r the heel of the r i n g gear.
(Sec F i g s . 5 a n d 6, P l a t e 3 A . )
I f the r i n g gear is m o v e d a w a y
f r o m the d r i v e p i n i o n the c o n t a c t is m o v e d t o w a r d the heel;
i f the gear is m o v e d closer t o the p i n i o n , the contact is m o v e d
t o w a r d the toe of the gear teeth.
T h e reason for this is that
w h e n the r i n g gear is m o v e d a w a y f r o m the p i n i o n the heel o f
the t o o t h w i l l be last in m e s h .
I f the gear is m o v e d t o w a r d the
p i n i o n , the b a c k l a s h o r clearance is first t a k e n u p at the toe.
Before a n a t t e m p t is m a d e t o a d j u s t the gear mesh, the rear
axle l u b r i c a n t s h o u l d be d r a i n e d a n d the gears cleaned.
A d j u s t m e n t of Drive P i n i o n
A n i n i t i a l a d j u s t m e n t
is m a d e o n the d r i v e p i n i o n w h e n
p u t t i n g the differential a n d p i n i o n assembly together b y i n -
s t a l l i n g the proper n u m b e r o f s h i m s between the front p i n i o n
b e a r i n g retainer a n d the front e n d o f the differential c a r r i e r
use sufficient s h i m s to g i v e a t o t a l thickness o f .075 t o .090 i n .
T h e s e shims are s u p p l i e d b y the F a c t o r y P a r t s D i v i s i o n i n
thickness of .010 i n . , .015 i n . , a n d .035 i n .
T h e final a d j u s t m e n t o f the d r i v e p i n i o n is made a c c o r d i n g
t o the t o o t h c o n t a c t as e x p l a i n e d u n d e r " T e s t i n g R i n g G e a r
for P r o p e r T o o t h C o n t a c t . '
A d j u s t m e n t of Differential Side Bearings
T o adjust the differential side bearings, it is necessary
first
t o remove the l o c k i n g plates for the adjuster
rings a n d
t o
loosen the bearing caps s l i g h t l y .
The adjusters are
t h e n
t u r n e d , using tool N o . h M 7 2 7 9 9 t o tighten the bearings so t h a t
a p u l l of 8 to 10 pounds, measured at the circumference o f the
r i n g gear, is required to t u r n this gear.
T h i s test c a n be m a d e
w i t h a spring scale h o o k e d o n one o f the r i n g gear teeth as
s h o w n in T i g . 1 o n this page.
A n i n i t i a l pull of about
15
pounds w i l l be required to start the gear, but as soon as it is
started the p u l l s h o u l d d r o p to 8 to 10 pounds.
A f t e r the a d j u s t m e n t is c o m p l e t e d , the bearing caps m u s t
be tightened a n d the l o c k i n g plates i n s t a l l e d .
August 1933
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