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 1248 of 1313
SYSTEM FAILS TO DEFLATE, PARTIALLY DEFLATES, OR TIRE PRESSURES ARE IMBALANCED -
Continued
STEP
8.
IS THERE AUDIBLE AIR FLOW FROM RELIEF VALVE ON PNEUMATIC CONTROLLER DURING
DEFLATION?
a.
Refer to point to point schematics.
T1068DAA
RELIEF
VALVE
Figure 8.
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.
With the battery switch in the ON position, select a mode that will cause deflation.
e.
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 (9).
NO - Replace faulty relief safety valve (Volume 5, WP
0810). Go to Step (11) to verify problem is solved.
TM 9-2320-272-23-1
0148
0148-9
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