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 160 of 323

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CHAP

5,

SEC

XVI I

BRAKE COOLANT OIL PUMP REBUIL D

PAR

147-151

Section XVII.

BRAKE COOLANT OIL PUMP—REBUILD

147. DESCRIPTIO N

Refer to par. 24 for description of the

brake coolant oil pump.

148. DISASSEMBLY (fig. 384, fold-out 13)

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

three cap screws 60 with three lock washers

59 and three self-locking bolts 53 securing the

brake coolant pump assembly 20 to the brake

coolant pump manifold 56. Remove the pump

assembly and gasket 54.

b . Remove two sets of brake coolant oil

check valve components (64 through 68).

c . Using l/2-inch wrench, remove self-

locking bolt 51 securing drive gear shroud 48

and shroud plate 50 to the pump. Remove the

shroud and plate. Straighten and remove lock

pin 42 from gear 49. Remove the gear.

d . Using a l/2-inch wrench, remove 14

self-locking bolts 27 and 52, securing the two

cover assemblies 28 and 44 to the coolant oil

pump body 32. Remove the cover assemblies.

e . Do not remove the needle bearing as-

semblies 29 and 45 or dowel pins 31 and 46

from covers 30 and 47 unless replacement is

necessary. If necessary, press or drive out

the bearings or pins.

f . Remove, as a unit, idler gear shaf t

22, pump drive shaft 40, two oil pump idler

gears 21 and 26, two drive gears 33 and 43,

and the two oil pump separator plate assem-

blies 23 and 36 from the pump body.

g . Remove idler gears 21 and 26 from

their shaft 22.

h . Remove oil pump drive gears 33 and

43 and keys 34 and 41 from the pump drive

shaft 40.

i . Remove two retaining rings 35 from

oil oil pump idler 22 and drive 40 gear shafts.

j . Remove separator plate assemblies 23

and 36 from shafts 22 and 40.

12 8

k . Do not remove needle bearings 25 and

37 from separator plates 24 and 38 unless re-

placement is necessary. If necessary, press

bearings from plates.

l . Do not remove retaining rings 39 from

oil pump idler 22 and drive 40 gear shafts un-

less replacement is necessary.

149. CLEANIN G

Refer to par. 71 for cleaning recommen-

dations.

150. INSPECTION AND REPAIR

Refer to par. 72 for general inspection

and repair recommendations. Repair and re-

build points of measurement for fits, clear-

ances and wear limits are indicated by small,

lower case letters in fig. 384, fold-out 13.

Refer to par. 247 for wear limits information.

151. ASSEMBLY (fig. 384, fold-out 13)

a . If needle bearings 25 and 37 were re-

moved from separator plates 24 and 38, install

replacements

0.320-inch

below

the

surface

adjacent to the bearing bores. Press on the

numbered side of the bearing cage.