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 1192 of 1313
TWO PRESSURE MODES INDICATED WITH STEADY MODE LIGHTS - Continued
STEP
16.
IS THERE AUDIBLE AIR FLOW FROM RELIEF VALVE ON PNEUMATIC CONTROLLER DURING
DEFLATION?
a.
Refer to point to point schematics.
T1099DAA
RELIEF
VALVE
Figure 14.
Relief Valve
b.
If air pressure is low, run engine at 1000 rpm for three to five minutes to build air supply to normal
operating pressure.
c.
Stop engine.
d.
Check for continuous and audible air flow from relief valve on pneumatic controller during deflation.
CONDITION/INDICATION
IS THERE AUDIBLE AIR FLOW FROM RELIEF VALVE ON PNEUMATIC CONTROLLER DURING
DEFLATION?
DECISION
YES - Go to Step (17).
NO - Replace faulty relief safety valve (Volume 5, WP
0810). Go to Step (23) to verify problem is solved.
TM 9-2320-272-23-1
0144
0144-15
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