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 1117 of 1313
PRIMARY AIR SYSTEM FAILS TO MAINTAIN PRESSURE (NO MAJOR LEAKS, AIR CAN BE HEARD
ESCAPING INTO AIR INTAKE STACK, PARKING BRAKE APPLIED) - Continued
STEP
1.
DOES AIR LEAK THROUGH SERVICE BRAKE CHAMBER VENT LINES?
a.
Disconnect vent line from right front service brake chamber (Volume 3, WP
0434). Refer to point to point
schematics.
T0884DAA
Service Brake
Chamber
Vent Line
Vent Port
Figure 1.
Service Brake Chamber Vent Line.
WARNING
Do not look in service chamber vent port when performing test. Failure to comply may
result in injury or death to personnel.
b.
Assistant applies service brakes and feels for evidence of escaping air at vent port.
c.
Connect vent line to service brake chamber.
d.
Check vent lines on all service brake chambers. Note any chambers that leak air.
CONDITION/INDICATION
DOES AIR LEAK THROUGH SERVICE BRAKE CHAMBER VENT LINES?
TM 9-2320-272-23-1
0132
0132-2
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