ALLIS-CHALMERS
Paragraph 239C
5
11 9
Fig. ACI05S~Modef V/D transmission cov-
er,
shifter forks and rails as installed on
the sync/iro-mesli transmissions. Fig, AC-
105A.
Model 1VD45 is similar.
1.
DuBt cover
2.
Retainer
3.
Shift lever
4.
8rd
&
4th selector
6. 3rd
&
4th rail
6. 8rd
&
4th fork
7.
Set screw
9. Interlock pin
10.
1st
&
2nd rail
11.
Interlock plunger
14.
Reverse Belector
16.
Betent spring
16.
Gasket
18.
Pivot pin
19.
Snap ring
21.
Oil shield
22.
1st
&
second fork
& selector
23.
Reverse rail
&
fork
equipped with a small, removable steel
pin (10) which engages a spline on
the bevel pinion shaft.
Bevel pinion can be purchased sep-
arately from bevel ring gear. Bevel
pinion mesh (fore and aft position) is
fixed and non-adjustable. However,
snap ring (5), which is available in
several thicknesses, controls the cone
center distance for a particular trans-
mission housing. II necessary to renew
the ring be sure that replacement is
of exactly the same thickness. This
does not apply where a new trans-
mission housing is being installed as
it is assumed that the new housing
will include a factory fitted snap ring.
Whenever the bevel pinion shaft,
gears and/or bushings are renewed, it
will be advisable to first make a trial
assembly on the bench of all parts lo-
cated between and including the front
and rear snap rings (8 & 21) to check
for free rotation of gears (12, 15
&
18).
The front snap ring (21) is available
in several thicknesses. Select a snap
ring which will eliminate all end play
of the assembled parts when same are
installed on the pinion shaft. 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 on which it
rotates. To provide gear side clear-
ance for free rotation, use a fine grade
oi emery cloth on a fiat surface to
decrease the width (fiat sides) of the
gear.
Reassembly is reverse of disassem-
bly. Assemble pinion shaft and bear-
ings on the bencn and adjust bearings
by means of nut (7) to a just percepti-
ble preioad of 10-20 inch pounds and
lock the adjustment with one of the
tabs on lock washer (6). In making up
the assembly, install the wider roller
bearing (one with longer rollers) next
to the bevel pinion. To facilitate re-
installation of pinion and bearings as-
sembly to transmission case, freeze
same in dry ice or freeze chest for at
least half an hour.
Enter pinion shaft and bearing as-
sembly in transmission housing and
install pinion shaft components in the
following order: Snap ring (8), wash-
er (9), first gear bushing (llA) with
lock pin hole facing forward, first
speed gear (12) 40 teeth with clutch
jaws forward, first and second gear
splined collar (13), second and re-
verse sliding gear (14) 34 teeth with
shifter fork groove rearward, second
gear bushing (IIB), second gear (15)
^5 teeth with clutch jaws rearward,
thrust washer (16), third gear bush-
ing (smallest) (17) with lock pin fac-
ing forward, third speed gear (18) 31
teeth with clutch jaws forward, third
and fourth gear splined collar (19),
snap ring (21) which is available in
several thicknesses, and third and
fourth gear splined coupling (20) with
shifter fork groove rearward. Install
bevel pinion shaft pilot bearing (22).
To the front end of transmission hous-
ing install main drive shaft assembly.
Working through differential com-
partment, install bevel pinion shaft
bearing retainer cap screws (2) and
torque same to 35 foot pounds. Using
soft, fiexible wire, threaded through
the drilled heads of the cap screws,
lock retainer cap screws in position.
After installing differential unit, ad-
just carrier bearings by means of
shims so that the unit rotates freely,
yet without perceptible end play. Af-
ter adjusting the bearings, adjust bevel
pinion-to-ring gear backlash to .005-
.014 by removing shims from under
one differential bearing carrier and
installing them under the opposite
bearing carrier. To increase the back-
lash,
remove shims from ring gear
side and install the same shims under
the carrier on the opposite side. This
adjustment should be made after*
never before, the bearings have been
adjusted.
239C.
COUNTERSHAFT. To remove
the countershaft and gears, first re-
move the main drive shaft, and bevel
pinion shaft as outlined in preceding
paragraphs 239A and 239B. From front
of transmission housing, remove coun-
tershaft front bearing cup retaining
snap ring (44). Snap ring (44), which
is available in several thicknesses, is
used to adjust the countershaft bear-
ings.
Working through differential
compartment, bump countershaft for-
ward and out of transmission housing,
and remove countershaft gears, rear
bearing cone and spacers out through
transmission top cover opening.
Whenever the countershaft andyor
bearings are renewed, or the counter-
shaft bearings require adjusting, it
will be advisable to first make a trial
installation of only the countershaft
and bearings in the transmission hous-
ing so as to adjust the shaft end play.
Shaft end play should be adjusted to
.003-.005 by varying the thickness of
the front bearing cup retaining snap
ring (44). After making the bearing
adjustment, remove the snap ring
bearing cup, shaft, and rear bearing
cone.
Reassembly is reverse of disassem-
bly. Install rear bearing cup (27) and
snap ring (26) in transmission hous-
ing. Install bearing front cone (42)
with taper toward end of shaft. Next,
from the forward end of the trans-
mission housing, enter the shaft
through front bearing bore, and in-
stall the gears and spacers in the fol-
lowing order: Drive gear (41) 37 teeth
with long hub rearward, spacer (40),
third gear (39) 26 teeth with long
hub forward, second gear (38) 22
teeth with long hub forward, spacer
(37) which is .654 wide, reverse gear
(36) 18 teeth with bevel of teeth rear-
ward, spacer (35) which is .966 wide.
Then, before installing the first gear
(34) 16 teeth, place the rear bearing
cone (28) in the rear bearing cup.
Holding the rear bearing cone in this
position, install the first gear (34)
and push countershaft rearward until
rear bearing cone is installed on the
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