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 476 of 836

TM 9-2320-272-24-4

THIS TASK COVERS:

a. Removal

b. Cleaning, Inspection, and Repair

c. Installation

APPLICABLE MODELS

M934/A1/A2

TOOLS

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

MATERIALS/PARTS

Five keys (Appendix D, Item 266)

Locknut (Appendix D, Item 297)

GAA grease (Appendix C, Item 28)

REFERENCES (TM)

LO 9-2320-272-12

TM 9-2320-272-10

TM 9-2320-272-24P

EQUIPMENT CONDITION

Parking brake set (TM 9-2320-272-10).

SPECIAL ENVIRONMENTAL CONDITIONS

Vehicle must be on level surface.

PERSONNEL REQUIRED

Two

NOTE

Left and right retractable beam drive shafts and locks are

replaced the same. This procedure is for the left retractable beam

drive shaft and lock.

1.

Remove locknut (1) and lock (2) from under-frame stud (8). Discard locknut (1).

2.

Remove screw (4), paw1 (3), and lock (2) from underframe (5).

3.

Remove thirty screws (7) and five covers (6) from underframe (5).

4.

Remove four setscrews (15) from bushings (14).

CAUTION

Do not bend or strain ratchet shaft during removal. Doing so may

result in damage to equipment.

NOTE

Remove all nicks, burrs, and corrosion from ratchet shaft and

lubricate before removal.

Direct assistant to catch ratchet shaft components under van

body during removal.

5.

Slowly pull ratchet shaft (9) and remove four bushings (14), nine bushings (13), spacers (12),

sprockets (11), and five spacers (10) from under-frame (5).

5-470