TM-9-2320-429-10

AIR SYSTEM - Continued

NOTE

The air system includes the necessary valves and air lines to control the

vehicle's air-operated parts.

Pressurized air from the air compressor (1) is passed through the air dryer (7) to the quick

buildup reservoir (2).

The air dryer (7) removes dirt and moisture from the pressurized air. Air from reservoir (2)

goes to the throttle treadle (8).

Depending on how far the throttle treadle is depressed, 0 to 60 psi (0 to 414 kPa) is supplied

to the engine throttle air cylinder (9) and to the transmission modulator (10). This air

pressure control the vehicle speed.

Once air pressure in reservoir (2) rises above 75 psi (517 kPa), a valve opens and allows

reservoirs (3, 4, or 6, and 5) to be pressurized up to 120 psi (827 kPa).

Air from reservoir (4 or 6) goes to the brake treadle valve (11). This air controls the rear axle

service parking brakes (12).

Air pressure in this system is shown by the red needle on the AIR PRESS gauge (13).

Air from reservoir (3) goes to the brake treadle valve.

This air controls the front axle service brakes (14).

Air pressure in this system is shown by the green needle on the AIR PRESS gauge.

The PARKING BRAKE valve (15) controls air from reservoirs (3 and 5) and applies or

releases the rear axle service (parking) brakes.

Reservoirs (3, 4, or 6, and 5) are interconnected so that if one reservoir fails, air is supplied

to release the rear axle service (parking) brakes from whichever reservoir is functioning. If

air pressure falls below 60 to 75 psi (414 kPa to 517 kPa), a buzzer will sound and the AIR

indicator (16) will illuminate.

Specific to the M984A1, the front brake actuator valve (17) is used to apply the front axle

service brakes when using heavy-duty winch.

END OF WORK PACKAGE

TM 9-2320-429-10

0009

0009-3

TM-9-2320-429-10 - Page 125 of 1096