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 104 of 323

PAR 70-71

CHAPTER 5

REPAIR AND REBUILD

Section I. PRELIMINARY INSTRUCTIONS FOR POWER TRAIN OVERHAUL

70. GENERAL

a . Provide Proper Equipment. Proper

equipment must be available before re-

build is started. This equipment includes a

hoist of at least 2-ton capacity, ade -

quate hand tools (par. 62) (and improvised

tools, where available). wood blocks. re-

ceptacles for small parts, lint-free wiping

cloths, oil-soluble grease and nonharden-

ing gasket cement.

Refer to Table II and

par. 62 for listing of special and impro-

vised tools.

WARNINGS

●

●

●

White lead is toxic. To avoid injury,

do not use white lead.

Transmission and transmission com-

ponents are heavy and can crush you.

Have a ground guide check slings and

lifting devices for cuts, breaks or

wear before and during hoisting .

Slings and lifting devices can break

and cause injury or death. To avoid

injury, do not stand under transmis-

sion or components when lifting them.

Fumes from burning Teflon can cause

serious injury or death .

Because

clutch piston seal rings and step-joint

seal rings are made of Teflon, do not

get rid of them by burning.

b . Parts to Discard. At transmission

assembly, all piston seals, seal rings, pack-

ings, lock washers, lock nuts, cotter pins,

lock wires, lock strips and gaskets should

be removed and discarded.

New parts

should always be supplied to replace such

items.

c . Avoid Component Damage.

Use

care avoid damage to transmission com-

ponents during disassembly, cleaning, in-

spection, repair and reassembly. Nicks,

scratches and dents resulting from care-

less handling may cause oil leakage or

improper functioning. This could result in

transmission failure. All defective parts

must be replaced .

Handling of heavy

components with slings and hooks, and

blocking the transmission for support in

various positions, is important for safety

and to prevent damage.

d. Torque. All plugs, bolts, nuts and

screws must be installed at the prescribed

torque

tightness t o

ensure

proper

assembly. Proper use of a torque wrench,

and careful attention to prescribed torque,

will help prevent distortion, oil leaks and

stripped threads. All torque requirements

for plugs, bolts, screws and nuts are found

in the pertinent rebuild section and in the

assembly step procedures (sec. XXXIII)

which follow.

71. CLEANING RECOMMENDATIONS

a . General. Cleanliness is of para-

mount importance in servicing a transmis-

sion. All components must be thoroughly

cleaned and kept clean throughout the re-

build process.

Dirt can cause malfunction

and possible failure of the transmission.

Refer to the Appendix A, Section 4b.

b . Cleaning Parts

WARNING

Compressed shop air will not exceed

30 psi (pounds per square inch). Regu-

lator assembly must be attached to

compressor. To avoid injury, use only

with effective chip-guarding and per-

sonal protective equipment (goggles/

faceshield, gloves, etc.).

74 Change 2