ALLIS-CHALMERS
Paragraphs 252-254B
fig, AC113B-Model WD hevel ring gear, and differential unit assembly when viewed
through transmission rear cover opening. Model WD45 is similar.
ferential unit and remove differential
bearing carriers (1—Fig. AC114). Lift
differential unit out through trans-
mission housing rear opening.
252.
To disassemble the two pinion,
open case type differential unit, pro-
ceed as follows: Remove pinion shaft
retaining pin (14) and bump pinion
shaft (13) out of differential case. Dif-
ferential pinions (5) and side gears
(4) can be renewed at this time.
Recommended backlash of .005 be-
tween pinions and side gears is con-
trolled by the copper plated steel side
gear thrust washers (3) and/or pinion
thrust washers (6). Early production
pinions are equipped with bushings,
but the bushings are not available for
service. Later production pinions do
not have bushings. When servicing
pinions with bushings, renew pinion
shafts and use later type pinions with-
out bushings. New oil seals (8) of
treated leather should be installed in
bearing carriers with the lip facing
inward.
The bevel ring gear, available sep-
arately from bevel pinion, is riveted
to the one-piece differential case. The
preferred method of removing the riv-
ets is to drill them out. When re-riv-
eting, temporarily bolt the ring gear to
the differential case and use cold riv-
ets,
being careful not to distort the case
in the process. Check trueness of ring
gear back face by mounting the unit
in its normal position in the differen-
tial compartment. Total run-out
should not exceed .003.
Inner end of each bull pinion gear
shaft is supported by and rotates in
a bronze bushing (10) in the differen-
tial case. These presized bushings can
be renewed without final sizing if care-
fully installed.
Reinstall bevel ring gear and differ-
ential unit and adjust the bevel ring
gear to bevel pinion backlash and dif-
ferential carrier bearings as outlined
for models B, C, and CA in paragraph
240A.
MAIN DRIVE BEVEL GEARS
On all models listed in this manual,
the mesh position of the main drive
hevel is fixed and non-adjustable. The
pinion shaft bearings are adjustable
for end play on all listed models. On
all listed models, the backlash of these
bevel gears is controlled by the ad-
justable differential carrier bearings.
Models B-C
253.
PINION BEARINGS ADJUST-
MENT. To adjust the pinion shaft
bearings, first detach torque tube from
1.
Bearing carrier
2.
Shims
3.
Thrust washer
4.
Side gear
5.
Differential pinion
6. Thrust washer
7.
Rivet
8. Oil seal
10.
Bushing
11.
Bevel ring gear
12.
Differential case
13.
Pinion shaft
14.
Retaining pin
16.
Bearing cone
16.
Bearing cup
transmission as outlined in paragraphs
185 and 185A. Unstake nut (38—Fig.
AC88) and turn same to get free rota-
tion with zero end play; then restake
the nut.
253A. CARRIER BEARINGS AD-
JUSTMENT. To adjust carrier bear-
ings and backlash of gears, proceed as
outlined in paragraphs 240 and 240A.
253B.
PINION & RING GEAR RE-
NEWAL. Proceed as outlined in para-
graph 203 which covers the renewal of
the pinion, and the removal of the ring
gear and differential. To renew the ring
gear or to overhaul the differential on
the bench, follow the procedure in
paragraph 241A.
Model CA
254.
PINION BEARINGS ADJUST-
MENT. Adjustment of pinion shaft
bearings is controlled by shims (39—
Fig. AC90) located on the pinion shaft
between the front bearing cone (35)
and the 2nd speed gear (32). To add
or remove shims it is necessary to re-
move the bearing cone which usually
fits the shaft so tightly that it can be
removed only by bumping the pinion
shaft rearward and out of the cone.
This method of getting to the shims
necessitates the removal of the trans-
mission from the tractor, and of the
differential from the transmission as
described in paragraph 206. The pinion
shaft bearings can then be adjusted
by following the procedure described
in paragraph 211 A.
254A. CARRIER BEARINGS AD-
JUSTMENT. To adjust the carrier
bearings and the backlash of the bevel
gears proceed as described in para-
graphs 240 and 240A.
254B.
PINION & RING GEAR RE-
NEWAL. To renew the pinion, and to
remove the ring gear and differential,
follow the procedure outlined in para-
graphs 209 and 210. The procedure for
bench overhaul of the differential, in-
cluding renewal of the ring gear is de-
scribed in paragraph 241A.
13
12 11 10
fig, ACII4-Mocfal WD main drive hevel ring gear and dif-
ferential unit. Shims (2} control differential carrier bearing
adiustment and bevel ring gear backlash adiustmemt.
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