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 1085 of 1313
AIR PRESSURE DOES NOT BUILD TO NORMAL OPERATING PRESSURE (ABOVE 80 PSI [552 KPA])
ACCORDING TO GAUGES - Continued
STEP
1.
ARE AIR LINES OR FITTINGS LEAKING?
a.
Start engine.
T0261DAA
Sec.
Gage
Primary
Gage
Primary (lower)
Air Gauge Port
Treadle
Valve
Spring Brake
Air Reservoir
Primary - Upper
Tank
Wet Tank
Secondary - Lower
Tank
Figure 1.
Air Supply System.
b.
Listen and locate air leaks. Refer to point to point schematics.
CONDITION/INDICATION
ARE AIR LINES OR FITTINGS LEAKING?
DECISION
YES - Tighten fittings or replace damaged air lines (Volume 5, WP
0805). Go to Step (3) to verify problem is
solved.
NO - Go to Step (2).
STEP
2.
CAN AIR GOVERNOR BE PROPERLY ADJUSTED?
a.
Check if air governor is properly adjusted. Refer to point to point schematics.
TM 9-2320-272-23-1
0127
0127-2
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