TM-9-2320-272-10
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; OPERATOR'S MANUAL
SEPTEMBER 2004
CHANGE 2
TM-9-2320-272-10 - Page 75 of 481
TM 9-2320-272-10
1-58
Change 2
1-20. 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 to 120 psi (621 to 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:
NOTE
• Vehicles equipped with antilock brake
system (ABS) will have a new air dryer
installed in position A shown below and
items F and H will be removed from
vehicle.
• Vehicles equipped with ABS have an
added 250 psi (1724 kPa) safety valve
installed in air supply line from
compressor to air dryer.
ABS EQUIPED VEHICLES
M939A2 ONLY
M939A1 AIR DRYER KIT
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