Figure 1-16. Air System

TM 9-2320-364-20-1

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 rear axle service brakes. This air controls the rear axle service

brakes. 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 60-70 psi (414-483 kPa) in either system, a buzzer will sound and the LOW

AIR indicator warning light will light. If air pressure in the brake system falls below 30 psi (207 kPa), the rear brakes

automatically apply.