TM-9-2320-272-24-3

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

TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 3 OF 4

JUNE 1998

TM-9-2320-272-24-3 - Page 422 of 799

TM 9-2320-272-24-3

4-130. FIFTH WHEEL MAINTENANCE (Contd)

b. Cleaning and Inspection

1.

For general cleaning instructions, refer to para. 2-14.

2.

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

3.

Inspect handle (1), plunger rack latch (3), pinion gear (6), stud (7), surface of fifth wheel housing (8),

two coupler jaws (11), compression arm (14), and two bushings (15) for grooves, breaks, cracks, cuts,

bends, stripped threads, and damaged gear teeth. Replace damaged part(s).

4.

Inspect springs (2), (5), (12), and (13) for bends, breaks, collapsed coils, and correct spring lengths.

Refer to table 4-10, Fifth Wheel Spring Free Length, for measurements. Replace damaged or worn

part(s).

5.

Inspect plunger rack (4), pivot pin (9), and cam (10) for wear. Refer to table 4-11, Fifth Wheel Wear

Limits/Tolerances, for measurements. Replace damaged or worn part(s).

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