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 104 of 836

TM 9-2320-272-24-4

5-16. THROTTLE COVER AND SHAFT MAINTENANCE

THIS TASK COVERS:

a. Disassembly

b. Inspection

c. Assembly

INITIAL SETUP:

APPLICABLE MODELS

REFERENCES (TM)

M939/A1

TM 9-2320-272-24P

TOOLS

EQUIPMENT CONDITION

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

Fuel pump housing disassembled (para. 5-15).

MATERIALS/PARTS

Two drive pins (Appendix D, Item 101)

O-ring (Appendix D, Item 461)

O-ring (Appendix D, Item 462)

O-ring (Appendix D, Item 463)

Lockwasher (Appendix D, Item 400)

Throttle shaft soft ball bearing (Appendix D,

Item 666)

a. Disassembly

1.

Center punch and drill out the two drive pins (8) connecting the fuel pump housing (1) to throttle

shaft cover (2). Discard drive pins (8).

2.

Remove nut (4), lockwasher (5), washer (6), screw (7), throttle lever (3), and throttle shaft cover (2)

from fuel pump housing (1). Discard lockwasher (5).

3.

Remove retaining ring (10) and throttle shaft (9) from fuel pump housing (1).

4.

Drill and remove soft ball bearing (18) from throttle shaft (9). Discard soft ball bearing (18).

5.

Remove two set screws (15) and throttle stop control (14) from throttle shaft (9).

6.

Remove O-rings (13) and (16), fuel-adjust screw (17), valve plug (12), and O-ring (11) from throttle

shaft (9). Discard O-rings (13), (16), and (11).

b. Inspection

1.

Inspect throttle shaft (9) for scoring, nicks, and scratches. If scored, nicked, or scratched, replace

throttle shaft (9).

5-98