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 1112 of 1313
SECONDARY PRESSURE GAUGE READS NO PRESSURE, LOW PRESSURE, OR BUILDS TO NORMAL
OPERATING PRESSURE SLOWLY. PRIMARY PRESSURE GAUGE READS NORMAL (ENGINE IDLING,
BRAKE PEDAL NOT APPLIED) - Continued
c.
Disconnect pressure gauge from vehicle.
d.
Reconnect both ends of secondary air pressure gauge air line.
e.
Disconnect draincock from drain line. Refer to point to point schematics.
f.
Connect adapter fitting to drain line and pressure gauge to fitting.
g.
Start engine.
h.
Monitor air pressure on pressure gauge.
i.
After 5 minutes pressure gauge should be read 90 psi.
CONDITION/INDICATION
DOES SECONDARY AIR RESERVOIR HAVE CORRECT AIR PRESSURE?
DECISION
NO - Go to Step (6).
YES - Go to Step (5).
TM 9-2320-272-23-1
0131
0131-7
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