TM-9-2320-272-24-2

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

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 2 OF 4

JUNE 1998

TM-9-2320-272-24-2 - Page 156 of 991

TM 9-2320-272-24-2

3-284. DRIVER’S SEAT FRAME AND BASE MAINTENANCE

THIS TASK COVERS:

a. Removal

c. Installation

b. Inspection and Repair

INITIAL SETUP:

APPLICABLE MODELS

REFERENCES (TM)

All

TM 9-2320-272-10

TOOLS

TM 9-2320-272-24P

TM 9-237

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

EQUIPMENT CONDITION

MATERIALS/PARTS

Eight locknuts (Appendix D, Item 277)

Eight lockwashers (Appendix D, Item 350)

Four lockwashers (Appendix D, Item 371)

GAA grease (Appendix C, Item 28)

l

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

l

Driver’s seat removed (para. 3-283).

l

Driver’s seat cushion and backrest cushion

removed (para. 3-285).

a. Removal

1.

2.

3.

4.

Remove four locknuts (2) and seat frame (1) from adjusters (3). Discard locknuts (2).

Remove two screws (17), four locknuts (7), washers (5), adjusters (3), and washers (15) from top

frame (14). Discard locknuts (7).

Remove two nuts (16), screws (4), and shock absorber (6) from seat base (13).

Remove four nuts (19), lockwashers (20), screws (11), and two brackets (21) from seat base (13).

Discard lockwashers (20).

5.

Remove spring (18) from seat base (13).

6.

Turn crank (12) fully clockwise to remove tension from torque springs.

7.

Remove four nuts (8), lockwashers (9), and screws (10) from seat base (13). Discard lockwashers (9).

8.

Remove top frame (14) from seat base (13).

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