Advertisement
(183)
REAR AXLE ASSEMBLY
REPAIRS
5-13
Figure 5-10-Checking Clearance Betw""n
Pinion
and
Roller Bearing
d. Pinion and Rear Bearing
The
desir ed
clearance
between
pimon
and
the
rear
(roller)
bearing
is .0005". The maxi-
mum all
owable clearance f
or
qu
iet
'gea r
opera-
tion is
.0014". E
xcessi ve clea rance at
this
point
is
usua lly ca
used
by
wear
of the r
oller
bearing.
Wear of
the
r
oller bea ri ng ma y
be checked
with a
micrometer. Befor e
chec king, m
ak e
cer-
tain that bearing is ab
solutely
clean
a
nd
that
micrometer is
accurate
at
zero readin g.
Meas-
ure
across the
outer race a
nd a
roller a
t f
our
or
five points around
bearing
as shown in
figure
5-9, using care to
ad
j ust
micrometer
lightly t
o
high points of
r
oller and race to
insure
an
accurate reading. The m
icrometer
will read
.6756" to .676" if bearing is satisfactory for
us
e.
If reading is
less
than .6756" the bearing
is worn
and
should be
discarded .
e. Pinion and Propeller Shaft
Chec
k
for
wear
of splines on pinion and in
the
p
r opeller shaft.
P
in ion m
us t
be a
tight
fit
in
pr opeller
shaft when
parts are
a
ssem bled.
f.
Rear :\xle and Third Member Housings
A
sprung
ho
us ing
sho uld
be
r
epla ced ;
straight ening
is
not re
com me nded.
A housin g
must never be heated
with
a
torch
as
this
may
produce soft spots
in
the metal in
w
hich
f
atigue
and
breakage may deve
lop in service.
Insp ect third member
housing for
:
oil leak
a
t torqu
e ball
and at
flanged
joint
between
t
orque tube
and
carr ier ;
cracked
torque
tube
;
strut rod
brackets br oken
or
cracked
at w
elds ;
pinion shaft
bearing bor es galled
or worn due
to bearing
turning
in housing
; str ipped
or
dam-
aged threads in side
bea ring pedestals or caps.
See
paragraph 5-28 f
or replacem ent
of
housing.
g. Parts Replacement
All
parts
of rear axle
assembly
that a
re
ex-
cessively worn,
scor ed,
ch
ipped ,
or
otherwise
damaged
should be
replaced wit h n
ew
parts to
insure
qu
iet
operation and
satisfact or y
se
r vice
after
assembly.
1. If a differential
bearing is to
be r
eplaced,
or
removed
from old differ ent ial
case
and in-
stalled on
new
ca se, pull bearing from
case
using Bearing P
ulle r
J
2241.
See figure
5-11.
The ends of
puller
j
aws
fit into notches in
dif-
ferential case
so that
pressure can
be
applied
to bearing
inner
r
ace.
Do not pull on roll
ers .
5-13 REPLACEMENT O
F
DIFFERENTIAL
BEARINGS (IF
NECESSARY)
Figure 5-11-Removing Diffe
rential
Bea
ring Using
Puller
J
22
41
\
An alternate method
of
checking clearance
between pinion and
roller bearing
is shown in
figure
5-10. Obtain a
piece
of tough
paper,
such
as t
yp ewriter
"second" sheet which m
easures
.0015"
thick
(use micrometer) and cut a test
strip
:%6"
w
ide . Place bearing on pinion about
lA."
above
spacer, insert
paper test strip be-
tween
two bearing
ro
ller s and rotate bearing
until strip is
under one
roller . If clearance is
sat isfact or y, the
bea r ing will
hang on the paper
strip
a
nd the paper
strip cannot be pull ed out.
If
bearin g
drops
of its own
weight, or paper
strip ca n
be
ea sily pulled
out, the
clearance is
excessive and
bearing
should be discarded.
NOTE: If roller
bearing
is
w
orn excessive ly,
it is quite
likely
tha
t
the dou ble-row front bear-
ing is worn so that it no longer has any pre-
load. Inspect this
bearing
very carefully and
discard if
loose
or
doubtful.
Advertisement
