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 1207 of 1313
FOUR PRESSURE MODE LIGHTS FLASHING - Continued
STEP
4.
DOES WHEEL VALVE LEAK AIR?
a.
Refer to point to point schematics.
T0419DAA
AIR SEALS
WHEEL
VALVE
Figure 4.
Wheel Valve.
WARNING
Air system components are subject to high pressure. Always relieve pressure before
loosening or removing air system components. Failure to comply may result in injury or
death to personnel.
NOTE
To determine a wheel valve air leak, with wheel valve still connected to tire, check for air
leak at quick release valves. Determine which valve is leaking, by disconnecting air line
at quick release valve to either feel or listen for air escaping.
b.
Check for air leak at the quick release valves.
CONDITION/INDICATION
DOES WHEEL VALVE LEAK AIR?
DECISION
YES - Front wheel valve leaks. Replace wheel valve (Volume 3, WP
0490). Go to Step (10) to verify problem
is solved.
YES - Rear wheel valve leaks. Replace wheel valve (Volume 3, WP
0491). Go to Step (10) to verify problem is
solved.
NO - Go to Step (5).
TM 9-2320-272-23-1
0145
0145-6
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