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 1145 of 1313
ALL AIR-OPERATED ACCESSORIES DO NOT OPERATE (HORN, WINDSHIELD WIPERS, WINDSHIELD
WASHERS, TRANSFER CASE CONTROLS), GAUGES AT NORMAL OPERATING PRESSURE - Continued
STEP
1.
DO THE INSTRUMENT PANEL GAUGES INDICATE NORMAL AIR PRESSURE?
a.
Start engine.
T0324DAA
SECONDARY
AIR
PRESSURE
GAGE
PRIMARY
AIR PRESSURE
GAGE
Figure 1.
Air Pressure Gauges.
b.
Monitor air pressure gauges on instrument panel.
c.
Pressure gauge should read 90 to 130 psi.
CONDITION/INDICATION
DO THE INSTRUMENT PANEL GAUGES INDICATE NORMAL AIR PRESSURE?
DECISION
YES - Replace damaged air lines (Volume 5, WP
0805). Go to Step (2) to verify problem is solved.
NO - Replace pressure protection valve (Volume 3, WP
0442). Go to Step (2) to verify problem is solved.
TM 9-2320-272-23-1
0137
0137-2
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