TM-9-2520-234-35

POWER TRAIN ASSEMBLY; ALLISON MODEL XTG411-2A

TECHNICAL MANUAL; FIELD AND DEPOT MAINTENANCE MANUAL

JULY 1962

TM-9-2520-234-35 - Page 161 of 323

*C2

PAR

151-153

REAR HOUSING REBUIL D

CHAP

5,

SEC

XVII I

d . Position oil separator plate assembly

36 on pump drive shaft 40 and retain it with

two retaining rings 35 and 39.

e . Insert key 34 in its groove on drive

shaft 40, at the end opposite the splined end.

Install drive gear 33.

f . Place pump cover assembly 28 on the

assembly table, inside up, and install the as-

sembled shaft, plate assembly and gear in the

cover .

g . Install the remaining separator plate

assembly 23 on idler gear shaft 22 and retain

it with two retaining rings 35 and 39.

h . Position the idler gear 26 over there-

maining bearing bore in the cover and install

the assembled idler gear shaft and plate as-

sembly .

i . Install the remaining idler gear 21 on

shaft 22, and drive gear 43 and key 41 on the

drive shaft 40.

j . Install pump cover assembly 44 o n

pump body 32, indexing dowel pins 46 with

their holes.

k . Install the assembled cover assembly

44 and body 32 over shafts, gears and sepa-

rator plates onto cover assembly 28. Install

seven bolts 27 and 52 to retain each cover as-

sembly. Torque them to 17-20 pound-feet.

l . Install brake coolant oil pump drive

gear 49 on the splined end of pump drive shaft

40. Install lock pin 42 through the gear and

bend the ends of the pin to lock it.

n. Assemble both sets of brake coolant

oil check valve components 64 through 68 on

brake coolant pump manifold 56.

o . Install pump assembly 20 and gasket

54 on manifold 56 and secure with three 3/8-

16 bolts 60 with lock washers 59 and three

3/8-16 self-locking bolts 53. Torque the cap

screws 60 to 26-32 pound-feet. Torque tine

self-locking bolts 53 to 36-43 pound-feet.

Section XVIII.

REAR HOUSING ASSEMBLY—REBUIL D

152. DESCRIPTIO N

Refer to pars. 17 and 18 for the descrip-

tion of the rear housing components.

153. DISASSEMBLY (figs. 377, 378, 379,

380, fold-outs 6, 7, 8, 9)

a . Using a 9/16-inch wrench, remov e

two

self-locking

bolts

that

retain

brake

air

valve assembly (fig. 175). Remove the valve

assembly .

b . Remove the retaining ring on the air

valve assembly (fig. 175 ).

c . Remove the pin, and disassemble the

air valve assembly (fig. 175).

d . Using a 9/16-inch wrench, remove 12

cap screws and lock washers retaining brake

inspection covers.

Remove the two cover s

with gaskets (fig. 175).

e . Remove the retaining ring that retains

brake coolant pump idler gear and bearing on

the idler gear shaft (fig. 176). Remove gear

and bearing.

f . Remove the retaining ring that retains

the bearing in the brake coolant idler gear

(fig. 176). Remove the bearing from the gear.

12 9