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 51 of 1313
TABLE OF CONTENTS - Continued
Page No.
WP Sequence No.
WARNING BUZZER FAILS TO SOUND OR FAILS TO SHUT OFF ON LOW PRESSURE
(BELOW 55-65 PSI [379-448 KPA]), AIR PRESSURE SYSTEM OPERATING NORMALLY.
....................
WP 0134
SPRING BRAKES DO NOT RELEASE (VEHICLE BRAKES GRAB OR DRAG).
.......................................
WP 0135
Figure 1.
Spring Brake Release Control.
.............................................................................................
0135-2
Figure 2.
Parking Brake Control Lever.
...............................................................................................
0135-3
Figure 3.
Parking Brake Control Lever.
...............................................................................................
0135-4
Figure 4.
Parking Brake Valve.
............................................................................................................
0135-5
Figure 5.
Air Intake Stack.
...................................................................................................................
0135-6
Figure 6.
Parking Brake Valve.
............................................................................................................
0135-7
Figure 7.
Parking Brake Quick Release Valve Assembly.
...................................................................
0135-8
SPRING BRAKES DO NOT SET (GAUGES AT NORMAL OPERATING PRESSURES, AIR
EXHAUSTING NOT HEARD WHEN PARKING BRAKE APPLIED).
...........................................................
WP 0136
Figure 1.
Spring Brake Control.
...........................................................................................................
0136-2
Figure 2.
Spring Brake Assembly.
.......................................................................................................
0136-3
Figure 3.
Quick Release Valve.
...........................................................................................................
0136-4
Figure 4.
Parking Brake Valve.
............................................................................................................
0136-5
ALL AIR-OPERATED ACCESSORIES DO NOT OPERATE (HORN, WINDSHIELD WIPERS,
WINDSHIELD WASHERS, TRANSFER CASE CONTROLS), GAUGES AT NORMAL
OPERATING PRESSURE.
..........................................................................................................................
WP 0137
Figure 1.
Air Pressure Gauges.
...........................................................................................................
0137-2
COOLING FAN DOES NOT OPERATE, ENGINE TEMPERATURE ABOVE 195°F (91°C) AS
INDICATED BY TEMPERATURE GAUGE.
.................................................................................................
WP 0138
Figure 1.
Secondary Air Pressure Gauge.
...........................................................................................
0138-2
Figure 2.
Fan Clutch Actuator.
.............................................................................................................
0138-3
COOLING FAN DOES NOT STOP RUNNING, ENGINE TEMPERATURE BELOW NORMAL
OPERATING RANGE (OVERRIDE BOLT NOT INSTALLED).
...................................................................
WP 0139
Figure 1.
Fan Clutch Actuator.
.............................................................................................................
0139-2
FRONT WHEEL DRIVE DOES NOT ENGAGE (FRONT WHEEL DRIVE LOCK-IN SWITCH
ENGAGED AND TRANSFER CASE SHIFT LEVER IN HIGH POSITION).
................................................
WP 0140
Figure 1.
Transfer Case Shift Lever.
...................................................................................................
0140-2
TM 9-2320-272-23-1
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