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 1072 of 1313

FIELD MAINTENANCE

NO AIR PRESSURE (WARNING BUZZER SOUNDING, AIR PRESSURE NOT BUILDING TO NORMAL

OPERATING RANGE AS INDICATED BY GAUGES)

INITIAL SETUP:

Tools and Special Tools

Tool Kit, General Mechanic's: Automotive

(Volume 5, WP

0826, Table 1, Item 56)

Gauge, Pressure

(Volume 5, WP

0826, Table 1, Item 19)

Test Set, Electronic Systems

(Volume 5, WP

0826, Table 1, Item 51)

Personnel Required

(2)

References

Point to Point Schematics

References (cont.)

WP

0130

WP

0131

Volume 3, WP

0436

Volume 5, WP

0805

Equipment Condition

Vehicle parked and engine shut down.

(TM

9-2320-272-10)

TROUBLESHOOTING PROCEDURE

NO AIR PRESSURE (WARNING BUZZER SOUNDING, AIR PRESSURE NOT BUILDING TO NORMAL

OPERATING RANGE AS INDICATED BY GAUGES)

NOTE

Conduct these malfunction tests if there is no air pressure, warning buzzer is sounding and

air pressure is not building to normal operating range as indicated by gauges. This procedure

will check for air leaks, faulty air compressor, blocked or clogged air lines, faulty air governor

or air gauges.

TM 9-2320-272-23-1

0126

0126-1