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 1093 of 1313
AIR PRESSURE EXCEEDS MAXIMUM (GAUGES SHOW OVER 130 PSI [896 KPA]), SAFETY VALVE OPENS
TO RELEASE PRESSURE - Continued
STEP
1.
IS THERE EVIDENCE OF AIR LOSS THROUGH ACCESSORIES?
a.
Visually inspect air accessories for air leaks.
b.
Start engine.
T0266DAA
Windshield
Wiper Switch
Windshield
Wiper Motor
Windshield Washer
Reservoir
Windshield Washer
Nozzles
Windshield Washer
Control
Horn Relay
Valve
Accessory
Manifold
Horns
Governor
Front Wheel Drive
Lock-in Switch
Front Axle
Engagement
Control Valve
Transfer Case Air
Shift Cylinder
FROM
PRESSURE
PROTECTION
VALVE
CONSTANT PRESSURE
SUPPLY LINES
WINDSHIELD WASHER
SIGNAL LINE
FRONT WHEEL DRIVE
LOCK-IN SIGNAL LINE
AUXILIARY AIR-POWER SYSTEM
Figure 1.
Auxiliary Air Power System.
c.
Listen and locate air leaks. Refer to point to point schematics.
CONDITION/INDICATION
IS THERE EVIDENCE OF AIR LOSS THROUGH ACCESSORIES?
DECISION
YES - Replace leaking accessory. Go to Step (4) to verify problem is solved.
NO - Go to Step (2).
TM 9-2320-272-23-1
0129
0129-2
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