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 100 of 836

TM 9-2320-272-24-4

5-14. GOVERNOR SPRING PACK MAINTENANCE

THIS TASK COVERS:

a. Removal

c. Installation

b. Inspection

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)

Spring tester (Appendix E, Item 131)

Fuel pump mounted on holding fixture (para. 5-12).

MATERIALS/PARTS

Retaining ring (Appendix D, Item 538)

Gasket (Appendix D, Item 223)

Seal (Appendix D, Item 612)

NOTE

Spring packs are maintained basically the same for AFC and

VS fuel pumps. This procedure covers the AFC fuel pump.

a. Removal

1.

Remove seal (12) from governor adjusting screw (13) and throttle leakage adjusting screw (18).

Discard seal (12).

2.

Remove four screws (14), spring pack cover (15), and gasket (16) from fuel pump (1). Discard

gasket (16).

3.

Remove retaining ring (11), spring retainer (10), shim(s) (9), spring (8), spring guide (5), washer (4),

spring (3), and plunger (2) from spring pack barrel (17). Discard retaining ring (11).

4.

Remove adjusting screw (7) and spring (6) from spring guide (5).

b. Inspection

1.

For general inspection instructions, refer to para. 2-15.

2.

Inspect spring pack cover (15) for cracks, breaks, and stripped threads. Replace spring pack cover (15)

if cracked, broken, or threads are stripped.

3.

Using spring tester, inspect tension of spring (8). Replace spring (8) if tension is not within 0.69-0.85 lb

(0.31-0.39 kg) when compressed to 1.0 in. (25.4 mm).

4.

Using spring tester, inspect tension of spring (3). Replace spring (3) if tension is not within 16.02-

17.78 lb (7.27-8.07 kg) when compressed to 1.025 in. (26.0 mm).

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