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 1021 of 1313
INSUFFICIENT BRAKES (VEHICLE STOPPING DISTANCE TOO LONG, NO APPARENT AIR SYSTEM
FAILURE WITH GAUGES AT NORMAL OPERATING PRESSURE, WARNING BUZZER NOT SOUNDING) -
Continued
STEP
17.
DOES THE LIMITING VALVE OPERATE PROPERLY?
a.
Stop engine and open all draincocks until brake system air pressure is vented.
b.
Close all draincocks.
c.
Disconnect pressure gauge and tee from vehicle and return air line to original condition.
d.
Assistant starts engine and runs to build air supply to normal operating pressure.
Limiting Valve
Vent Port
T0216DAA
Limiting Valve
Vent Line
Figure 16.
Limiting Valve.
e.
Disconnect vent line from limiting valve vent port (Volume 3, WP
0439). Refer to point to point
schematics.
TM 9-2320-272-23-1
0120
0120-32
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