AIR SYSTEM.

TM 9-2320-364-34-1

1-13. AIR SYSTEM.

Figure 1-16. Air System

The air system (Figure 1-16) consists of an engine-driven air compressor (1) and five air reservoirs (2). The system

includes the necessary valves and air lines to control the truck's air operated devices. Pressurized air from the air

compressor is passed through the air dryer (3) to the reservoir. The air dryer removes dirt and moisture from the

pressurized air. Air from one reservoir goes to the brake treadle valve. This air passes to the rear brake chambers,

located on axles #3, #4, and #5, which control the axle rear service brake. Air pressure in this system is shown by the

red needle on the AIR PRESS gage. Air from another reservoir goes to the brake treadle valve. This air passes to the

front brake chambers, located on axles #1 and #2, which control the front axle service brakes. Air pressure in this

system is shown by the green needle on the AIR PRESS gage. The PARKING BRAKE valve applies or releases the

rear axle (parking) brakes. The reservoirs are interconnected in such a way that if one reservoir fails, air will be

supplied to release the rear axle (parking) brake from whichever reservoir is functioning. If air pressure falls below

60 to 70 psi (414 to 483 kPa) in either system, a buzzer will sound, the LOW AIR indicator will light and the rear axle

brakes will be applied.