ALLIS-CHALMERS
Paragraphs 242-246
Model e
The main drive bevel pinion and
ring gear are available only as a
matched set; neither can be purchased
separately,
242.
BEARINGS AND BACKLASH
ADJUSTMENT. Carrier bearings are
adjusted by varying the number and
thickness of shims (11—Fig. ACllO)
located under each carrier. Although
shim removal can be accomplished
without detaching the engine clutch
housing from the transmission, there is
no sure way of checking the bearing
adjustment or the pinion to ring gear
backlash without doing so.
To adjust bearings, it is necessary to
first remove both axle shaft and sleeve
units as outlined in paragraph 286.
Remove each backing plate and its
brake shoes as an assembly. Detach
engine and clutch housing from trans-
mission housing. Remove bearing car-
riers (10) then adjust bearings to zero
end play and bevel pinion to ring gear
backlash to .005-.007 as outlined in
paragraph 240A.
243.
R&R AND OVERHAUL, Main
drive bevel ring gear and differential
unit are carried in the transmission
housing rear compartment. To remove
the differential unit, proceed as for
adjusting bearings as outlined in para-
graph 242 then lift out the differential.
244.
To overhaul the two pinion,
open case type differential unit on the
bench proceed as outlined in paragraph
241A.
13
1 2
8
S
fig. ACfll-Moffof RC
iiev«f ring gmar and
differential unit os-
sembfy—reor view.
(B) Bolts retaining rear
axle fcotfsj'ng to tractor
frame rails, (S) Nufs A
studs retaining cfiffer-
ential carrier to rear
axle housing,
1.
Carrier case cap
2.
Diflferential carrier
3.
Differential case
4.
Differential pinion
shaft lock screw
5.
Differential pinion
gear shaft
6. Thrust washer
7.
Differential pinion
8. Main drive ring gear
9. Bearing adjusting ring
10.
Thrust washer
11.
Side gear
12.
Rear axle housing
13.
Carrier dowel pin
Model RC
245.
BEARINGS AND BACKLASH
ADJUSTMENT. Carrier bearings are
adjusted by turning the adjusting
rings O^Fig. AClll). To adjust the
bearings, it is necessary to first detach
the rear axle housing (12) from the
differential carrier as follows: Support
rear of tractor frame and detach rear
axle housing from the end of each
frame side rail by removing bolts
(B) on each side. Remove steering
support brace and roll rear axle and
torque tube backward as a unit, until
it is clear of transmission. Remove
both bull pinion shafts from rear axle
12
7
11
Thrust
Differential pinion
Pinion shaft
Side gear
Thrust washer
Bevel ring gear
Bevel pinion & shaft
Retaining pin
Oil seal
Bearing carrier
Shims
Bearing cup
Bearing cone
Differential case
Rivet
Pig, ACl to-Model 6 main drive bevel pinion and ring
gear and differential unit. Shims (11) control di0erential
carrier bearing ad'iustment and bevel ring gear backlash
dl
housing as outlined in paragraph 277,
Remove nuts from studs (S—Fig. AC81
or 111), and pull axle housing away
from differential carrier. The carrier
bearing adjusting rings. (9—Fig.
AClll) are now accessible.
245A. Adjust bearings by turning
adjusting rings (d). Bearings should
be adjusted to a free rolling fit, then
tightened one extra notch of one of
the adjusting rings to provide a slight
bearing preload. Adjusting rings must
be set so that differential case is posi-
tioned to provide .004-.008 inch back-
lash between ring and pinion gears.
To increase backlash (after bearings
have been adjusted), turn adjusting
ring on ring gear side "out" and oppo-
site ring *'in" the same amount. To
decrease backlash, reverse directions.
Lock adjustment with ring pin and
cotter pin.
246.
R&R AND OVERHAUL. To
remove the differential assembly, the
carrier unit (8—Fig. AC81) or (10—
Fig. AC82) must first be removed from
the rear axle housing. Support rear of
tractor frame and detach rear axle
housing from the end of each frame
side rail by removing bolts. Remove
steering support brace and roll axle
and torque tube assembly backward
until clear of transmission. Remove
bull pinion shafts from the rear axle
housing. Refer to paragraph 277 for
removal procedure. Remove nuts from
studs (S) retaining carrier (2—Fig.
AClll) to axle housing (12) and roll
axle housing away from carrier and
torque tube assembly. Remove carrier
71
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