TM-9-2320-272-23-1

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

TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5

SEPTEMBER 2012

TM-9-2320-272-23-1 - Page 1144 of 1313

FIELD MAINTENANCE

ALL AIR-OPERATED ACCESSORIES DO NOT OPERATE (HORN, WINDSHIELD WIPERS, WINDSHIELD

WASHERS, TRANSFER CASE CONTROLS), GAUGES AT NORMAL OPERATING PRESSURE

INITIAL SETUP:

Tools and Special Tools

Tool Kit, General Mechanic's: Automotive

(Volume 5, WP

0826, Table 1, Item 56)

Test Set, Electronic Systems

(Volume 5, WP

0826, Table 1, Item 51)

Personnel Required

(2)

References

Point to Point Schematics

References (cont.)

Volume 3, WP

0442

Volume 5, WP

0805

Equipment Condition

Vehicle parked and engine shut down.

(TM

9-2320-272-10)

TROUBLESHOOTING PROCEDURE

ALL AIR-OPERATED ACCESSORIES DO NOT OPERATE (HORN, WINDSHIELD WIPERS, WINDSHIELD

WASHERS, TRANSFER CASE CONTROLS), GAUGES AT NORMAL OPERATING PRESSURE

NOTE

Conduct these malfunction tests if all air operated accessories do not work. This procedure

will check for defective air lines between the governor and accessories, and the pressure

protection valve.

TM 9-2320-272-23-1

0137

0137-1