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 50 of 1313
TABLE OF CONTENTS - Continued
Page No.
WP Sequence No.
Figure 1.
Auxiliary Air Power System.
.................................................................................................
0129-2
Figure 2.
Air Governor Signal Line.
.....................................................................................................
0129-3
Figure 3.
Air Governor Signal Line.
.....................................................................................................
0129-4
PRIMARY PRESSURE GAUGE READS NO PRESSURE, LOW PRESSURE, OR BUILDS TO
NORMAL OPERATING PRESSURE SLOWLY. SECONDARY PRESSURE GAUGE READS
NORMAL (ENGINE IDLING, BRAKE PEDAL NOT APPLIED).
...................................................................
WP 0130
Figure 1.
Air Supply System.
...............................................................................................................
0130-2
Figure 2.
Primary Air Pressure Gauge.
...............................................................................................
0130-3
Figure 3.
Brake Pedal.
.........................................................................................................................
0130-4
Figure 4.
Primary Air Reservoir Drain Line.
.........................................................................................
0130-5
Figure 5.
Primary Air System Supply Line.
..........................................................................................
0130-6
Figure 6.
One-Way Check Valve.
........................................................................................................
0130-7
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).
...................................................................
WP 0131
Figure 1.
Air Supply System.
...............................................................................................................
0131-2
Figure 2.
Secondary Air Pressure Gauge.
...........................................................................................
0131-3
Figure 3.
Brake Pedal.
.........................................................................................................................
0131-4
Figure 4.
Secondary Air Reservoir Drain Line.
....................................................................................
0131-6
Figure 5.
Secondary Air System Supply Line.
.....................................................................................
0131-8
Figure 6.
One-Way Check Valve.
........................................................................................................
0131-9
PRIMARY AIR SYSTEM FAILS TO MAINTAIN PRESSURE (NO MAJOR LEAKS, AIR CAN BE
HEARD ESCAPING INTO AIR INTAKE STACK, PARKING BRAKE APPLIED).
.......................................
WP 0132
Figure 1.
Service Brake Chamber Vent Line.
......................................................................................
0132-2
SECONDARY AIR SYSTEM FAILS TO MAINTAIN PRESSURE (NO MAJOR LEAKS, AIR CAN
BE HEARD ESCAPING INTO AIR INTAKE STACK, PARKING BRAKE APPLIED).
..................................
WP 0133
Figure 1.
Secondary Relay Valve Delivery Port.
.................................................................................
0133-2
Figure 2.
Secondary Relay Valve Delivery Port.
.................................................................................
0133-4
Figure 3.
Service Brake Pedal Valve.
..................................................................................................
0133-6
TM 9-2320-272-23-1
xxix
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