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 490 of 836

5-71. UNDERFRAME

TM 9-2320-272-24-4

THIS TASK COVERS:

a. Removal

b. Installation

APPLICABLE MODELS

REFERENCES (TM)

M934/A1/A2

TM 9-2320-272-10

TOOLS

TM 9-2320-272-24P

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

EQUIPMENT CONDITION

Rivet gun

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

MATERIALS/PARTS

SPECIAL ENVIRONMENTAL CONDITIONS

Eight lockwashers (Appendix D, Item 400)

Vehicle must be on level surface.

Two seals, 206 in. (Appendix D, Item 617)

Thirty-two rivets (Appendix D, Item 558)

Sealing compound (Appendix C, Item 67)

NOTE

Assistant will help with step 1.

1.

Remove one hundred thirty-eight screws (14), two retainers (15), channels (12), and seals (13) from

underframe (1). Discard seals (13).

2.

Remove thirty-two screws (4) and four covers (5) from under-frame (1).

3.

Remove eight nuts (3), lockwashers (2), screws (7), and four plates (6) from under-frame (1). Discard

lockwashers (2).

4.

Remove thirty-two rivets (8) and eight tiedowns (9) from underframe (1). Discard rivets (8).

5.

Remove four screws (11) and angle bracket (10) from underframe (1).

1.

Install angle bracket (10) on underframe (1) with four screws (11).

2.

Install eight tiedowns (9) on underframe (1) with thirty-two new rivets (8).

3.

Install four plates (6) on underframe (1) with eight screws (7), new lockwashers (2), and nuts (3).

4.

Install four covers (5) on underframe (1) with thirty-two screws (4).

NOTE

Apply sealing compound to exterior joints for installation.

5.

Install two new seals (13), channels (12), and retainers (15) on underframe (1) with one hundred

thirty-eight screws (14).

5-484