TM-9-2320-272-24-4

TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 4 OF 4

JUNE 1998

TM-9-2320-272-24-4 - Page 632 of 836

5-106. BOOM

TM 9-2320-272-24-4

THIS TASK COVERS:

a.

Disassembly

c. Assembly

b.

Cleaning, Inspection, and Repair

INITIAL SETUP:

APPLICABLE MODELS

M936/A1/A2

SPECIAL TOOLS

Bushing installer (Appendix E, Item 23)

EQUIPMENT CONDITION

Handle (Appendix E, Item 61)

Extension cylinder removed (para. 4-196)

TOOLS

General mechanic’s tool kit (Appendix E, Item 1)

Spanner wrench (Appendix E, Item 166)

GENERAL SAFETY INSTRUCTIONS

Keep fire extinguisher nearby when using

drycleaning solvent.

MATERIALS/PARTS

Drycleaning solvent is flammable and toxic. Do

not use near an open flame.

Wiper strip (Appendix D, Item 720)

Lockwire (Appendix D, Item 421)

O-ring (Appendix D, Item 467)

Packing (Appendix D, Item 510)

Crocus cloth (Appendix C, Item 20)

Drycleaning solvent (Appendix C, Item 71)

Lint-free cloth (Appendix C, Item 21)

REFERENCES (TM)

LO 9-2320-272-12

TM 9-2320-272-24P

1.

Using spanner wrench, remove cylinder head (21 from cylinder body (3).

2.

Remove piston rod (11 from cylinder body (3).

3.

Remove lockwire (14) and piston rod nut (15) from piston rod (1). Discard lockwire (14).

4.

Remove washer (13), two U-cup retainers (9), U-cups (10), piston (11), cylinder head (2), and wiper

strip (5) from piston rod (1). Discard wiper strip (5).

5.

Remove packing nut (4), packing (6), O-ring (8), and piston rod bushing (7) from cylinder head (2).

Discard O-ring (8) and packing (6).

6.

Remove two half rings (12) from piston (11).

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