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 711 of 991

TM 9-2320-272-24-2

Table 4-1. Mechanical Troubleshooting (Contd).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 18. Install pressure gauge (Appendix E, Item 168) on rear winch directional control valve.

NOTE

Ensure engine is off.

a.

b.

c.

d.

e.

Remove twelve screws (10), lockwashers (11), and control valve covers (12) and (13) from

wrecker (14). Discard lockwashers (11).

NOTE

If gauge port cover plate assembly or rear winch control valve is

equipped with pipe plug, proceed to step d. If gauge port cover

plate assembly is not equipped with pipe plug, proceed to step b.

Have drainage container ready to catch oil.

Remove four screws (15), lockwashers (16), cover plate assembly (19), and O-ring (17)

from rear winch control valve (18). Discard O-ring (17) and lockwashers (16).

Install new O-ring (17) and cover plate assembly (19) with plug (23) on rear winch

control valve (18) with four new lockwashers (16) and screws (15).

Remove plug (23) from cover plate assembly (19).

Install appropriate connector (24), hose assembly (20), connector (22), and pressure

gauge (21) on rear winch control valve (18).

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