ALLIS-CHALMERS
Paragraphs 207-21T
A
vent
the
loss
of the
first, second, third,
and fourth gear bushing pins.
207.
SHIFTER RAILS. Rails
and
forks
can be
removed after removing
transmission cover. Complete disas-
sembly
of
rails
and
forks
is
self-evi-
dent after
an
examination
and
refer-
ence
to Fig.
AC91.
208.
MAIN SHAFT. Transmission
main shaft (41—Fig. AC90 or 92)
is
re-
moved
by
first removing transmission
from tractor
and
PTO
as
described
in
paragraph
206.
Remove
PTO
sliding
drive gear
(15)
from rear end
of
main
shaft. Remove bearing retainer
(1)
and bearing adjusting shims from
front face
of
transmission housing.
Bump main shaft forward and out of
gears
and
transmission housing. Front
bearing cone
(3)
will remain on trans-
mission shaft. Center bearing cup
(10)
will remain
in
transmission housing,
and same can
be
removed
by
bumping
it
in a
forward direction. Main shaft
rear bearing outer race
and
roller
as-
sembly
(17)
will remain
in the PTO
(accessory) housing.
Reassembly
is
reverse
of
disassem-
bly. Install second speed gear,
26
teeth
(4)
with flat side rearward; next,
install short spacer (57); reverse gear,
19 teeth
(5)
with long part
of hub
facing rearward; third gear,
30
teeth
(6) with long part
of
hub facing
for-
ward; fourth gear
49
teeth
(7)
with
long part
of hub
facing rearward;
long spacer (8); and low gear, 18 teeth
(9).
Install
oil
seal
(42),
which
is lo-
cated
in
front bearing retainer, with
lip
of
same facing
the
differential unit.
Shims
(2)
located between bearing
retainer and front face
of
transmission
housing control main shaft bearing ad-
justment. Adjust
to
permit shaft
to
rotate freely
but
without
end
play.
209.
BEVEL PINION SHAFT.
The
bevel pinion shaft
and
gears
can be
removed
by
first removing transmis-
sion
and
differential
as
described
in
paragraph 206.
The
bevel pinion shaft
can be removed before
or
after remov-
ing transmission main shaft. Because
of
the
limited working space provided
by
the
transmission cover opening
for
reinstallation
of
pinion shaft,
it is ad-
visable
to
also remove the reverse idler
gear and shaft.
Remove bearing cover
(37)
from
front face
of
transmission housing, and
unstake retaining
nut (36).
Remove
retaining
nut, and
bump bevel pinion
shaft rearward
and out of
gears
and
transmission housing.
Bevel pinion
can be
purchased
sep-
arately from bevel ring^ gear. Bevel
pinion mesh (fore
and aft
position)
is
fixed and non-adjustable.
33
^
61
^}
46
29 c«
28
Fig, AC93—Model
CA
transmission bevel pinion shaft, gears,
and
related parts assembly.
Shims (39) confrof od/vstmenf
of
bearings.
B,
Bevel pinion shaft lst, 2nd,
Hrd, & 4th sear bushings
P.
Bushing pin
27.
lst gear (50T.)
28.
Coupling
29.
4th gear (24T.)
30.
3rd gear <37T.)
31.
Reverse gear (30T.)
32.
2nd gear (4IT.)
33.
Snap ring
35.
Bearing
36.
Retaining nut
38.
Bevel pinion shaft
39.
Shims
40.
Thrust washer
45.
lst
&
4th gear fork
4e.
2nd & 3rd gear fork
58.
Bearing
69.
Splined coupling collar
60.
Spacer
61.
Reverse gear splined collar
67.
Snap ring
210.
Whenever
the
bevel pinion
shaft, gears, and/or bushings
are re-
newed,
it
will
be
advisable
to
first
make
a
trial assembly
on the
bench
of
all
the
parts
to
check
for
free rotation
of gears (32,
30, 29,
&
27—Fig. AC93).
Tighten retaining nuts
to 50 ft. lbs. If
any gear fails
to
freely rotate when
bevel pinion shaft
is
held stationary,
it
is an
indication that
the
gear
hub
is wider than
the
bushing
(B) on
which
it
rotates.
To
provide gear side
clearance
for
free rotation,
use a
fine
grade
of
emery cloth
on a
flat surface
to decrease
the
width (flat sides)
of
the gear.
211.
Reassembly
is
reverse
of
disas-
sembly.
As an aid in
reassembling,
re-
move front bearing
cup (35)
from
transmission housing.
CAUTION:
The low,
second, third,
and
fourth speed gears rotate
on
hardened steel
bushings
(B).
Each bushing
is
equipped with
a small removable steel
pin (P)
which
en-
gages
a
spline
in the
bevel pinion shaft.
Renew pins
if
damaged
in any way and
rivet
the
pins
in the
bushings
to
prevent
their falling
out
during
the
reassembly
of
the pinion shaft.
Reinstall bevel pinion shaft
in
hous-
ing, and working through transmission
cover opening, install gears, thrust
washers,
and
shims,
as
shown
in Fig.
AC93.
211 A. Bearing Adjustment
To ad-
just bevel pinion shaft bearings,
add
several more shims
(39) to
the number
originally removed
so as to
provide
fig, AC94-Model
CA
bevel pinion shaH
7nd gear
f4irj,
steel bushing
and pin as*
sembly.
The
bevel pinion shaft
1st, 3rd,
and
4th
gears rotate
on
similar bushings,
shaft with
end
play. Shims
are
avail-
able
in .003, .005, and .010
thickness.
Next, install bearing cup and cone, and
tighten retaining
nut to 50 ft. lbs.
torque. With
a
dial indicator, measure
and record pinion shaft
end
play then
remove shims equal
in
amount
to the
recorded pinion shaft
end
play
so
that
shaft rotates freely,
yet
without
per-
ceptible
end
play.
If the
front bearing
cone
is a
tight
flt
on the shaft
it
will
be
advisable
in
removing
the
shims
to
remove
the
bevel pinion shaft
and
gears.
After bearings
are
adjusted,
tighten
nut
(36) .to 50
ft.
lbs., and lock
same
in
position
by
staking.
After installing differential unit,
ad-
just carrier bearings
by
means
of
59
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