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 1114 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
YES - Replace defective brake pedal valve (Volume 3, WP
0429), M936 (Volume 3, WP
0430). Go to Step (7)
to verify problem is solved.
STEP
6.
IS ONE-WAY CHECK VALVE IN GOOD OPERATING CONDITION?
a.
Stop engine and open all draincocks until brake system is vented.
b.
Disconnect pressure gauge from vehicle return air line to original condition.
Check Valve
T0283DAA
Figure 6.
One-Way Check Valve.
c.
Remove one-way check valve.
d.
Inspect check valve for clogging and damage.
CONDITION/INDICATION
IS ONE-WAY CHECK VALVE IN GOOD OPERATING CONDITION?
DECISION
NO - Replace defective one-way check valve (Volume 3, WP
0437). Go to Step (7) to verify problem is solved.
YES - Notify supervisor. Action may not be possible at this level of maintenance.
TM 9-2320-272-23-1
0131
0131-9
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