TM-9-2320-272-24-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; UNIT, DIRECT SUPPORT, AND GENERAL SUPPORT MAINTENANCE MANUAL; VOLUME 1 OF 4
JUNE 1998
TM-9-2320-272-24-1 - Page 66 of 1015
TM 9-2320-272-24-1
1-23. COMPRESSED AIR AND BRAKE SYSTEM OPERATION (Contd)
b. Air Pressure Supply System Operation.
(1) A constant air pressure supply is developed by the compressor which is regulated by the governor
to maintain 90-120 psi (621-827 kPa) for the airbrake system. Moisture within the system is controlled
through the use of either the alcohol evaporator or air dryer. The major components of the system are:
1-56
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