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 1240 of 1313

FIELD MAINTENANCE

SYSTEM FAILS TO DEFLATE, PARTIALLY DEFLATES, OR TIRE PRESSURES ARE IMBALANCED

INITIAL SETUP:

Tools and Special Tools

Tool Kit, General Mechanic's: Automotive

(Volume 5, WP

0826, Table 1, Item 56)

Goggles, Industrial

(Volume 5, WP

0826, Table 1, Item 20)

Soap Solution

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

0481

Volume 3, WP

0482

Volume 3, WP

0487

Volume 3, WP

0490

Volume 3, WP

0491

Volume 5, WP

0805

Volume 5, WP

0806

Volume 5, WP

0809

Volume 5, WP

0810

Equipment Condition

Vehicle parked and engine shut down.

(TM

9-2320-272-10)

TROUBLESHOOTING PROCEDURE

SYSTEM FAILS TO DEFLATE, PARTIALLY DEFLATES, OR TIRE PRESSURES ARE IMBALANCED

NOTE

•

Conduct these malfunction tests if the system fails to deflate, partially deflates, or tire

pressures are imbalanced. This procedure will check for excessive water in tire and faulty

relief valve on pneumatic controller, quick release valves, pneumatic controller, air lines,

hub air seals, wheel valve, and wheel valve filter.

•

During deflation, all tires respond independently. Generally, failure of the entire system

to deflate indicates a control problem. Failure of an individual tire to deflate indicates a

problem at the wheel.

TM 9-2320-272-23-1

0148

0148-1