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 136 of 323

CHAP
5,
SEC
III
INPUT PRESSURE, SCAVENGE OIL PUMP REBUIL D
PA R
Section Ill,
INPUT PRESSURE AND SCAVENGE OIL PUMP ASSEMBLY—REBUILD
77. DESCRIPTIO N
Refer to par. 10 for description of the in-
put pressure and scavenge oil pump assembly.
78. DISASSEMBLY (fig. 373, fold-out 2)
a . Using a 9/16-inch wrench, remov e
four self-locking bolts 52 from pump assem-
bly 45.
b . Remove scavenge oil pump body 47,
gears 55 and 56 and Woodruff key 51.
c . Do not remove the two needle bear-
ings 53 and 54 from scavenge pump body 47
unless replacement is necessary .
Remov e
bearings with an expanding slide hammer re-
mover tool. If such a tool is not available,
the bearings will have to be cut out with a
burr gun.
d . Remove pump separator plate assem-
bly 48.
e . Remove pressure pump drive gear 57
and idler gear 58 from pump body 61.
f . Do not remove the two needle bearings
59 and 60 from the pressure pump body 61
unless replacement is necessary .
Remov e
bearings with an expanding slide hammer re-
mover tool. Refer to c , above .
g . Do not remove the two dowel pins 49
from the pump separator plate 50 unless re-
placement is necessary. If necessary, re -
move the dowels.
79. CLEANIN G
Refer to par. 71 for cleaning recommen-
dations.
80. INSPECTION AND REPAIR
Refer to par. 72 for general inspection
77- 8
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, 373, fold-out 2 .
Refer to par. 236 for wear limits information.
81. ASSEMBLY (fig. 373, fold-out 2)
a . If the two dowel pins 49 were removed
from–pump separator plate 50, press in new
pins, leaving one end of each within 0.420 inch
of the plate surface.
b . If the two needle bearings 59 and 60
were removed from pressure pump body 61,
install new replacements. Press the bearing,
against the numbered side of the bearing cage,
0.060 to 0.100 inch below the surface adjacent
to the bearing bore.
c . If the two needle bearings 53 and 54
were removed from scavenge pump body 47,
install new replacements. Press the bearing,
against the numbered side of the bearing cage
and from the inside of the body, 0.010 to 0.040
inch below the surface adjacent to the bearing
bore .
d . Install input pressure pump drive gear
57 and idler gear 58 into input pressure pump
body 61.
e . Install pump separator plate assem-
bly 48.
f . Install Woodruff key 51 onto input pres-
sure pump drive gear 57.
g . Install scavenge pump gears 55 and 56
onto input pump drive gear 57 and idler gear 58.
h . Install scavenge pump body assembly
47 and secure with four 3/8-16 x 2-1/4 self-
locking bolts 52.
Torque the bolts to 36-43
pound-feet. After assembly, the pump should
rotate freely .
10 4


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