Figure 34-33. Typical Air Compressor, Three-Cylinder.

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Figure 34-32. Typical Air Compressor, Two-Cylinder.

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TM-9-8000 Principles of Automotive Vehicles Manual

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Figure 34-34. Governor.

TM 9-8000

Figure 34-33. Typical Air Compressor, Three-Cylinder.

d. Airbrake valve. The airbrake valve lever Is

force exerted on top of the diaphragm, the diaphragm

lifts sufficiently to close the intake valve and maintain the

connected to the brake pedal. Movement of the lever

system in the holding position. Further depression of the

controls the operation of the Inlet and exhaust valves

pedal puts additional mechanical force on the

(fig. 34-35) that control the air under pressure delivered

diaphragm, thereby allowing further brake application. If

to or released from the brake chambers. As the brake

the driver releases the brake pedal, reducing the

pedal is de- pressed, the brake valve lever moves toward

mechanical force on the diaphragm, the Inlet valve

its applied position. The plunger and regulating spring

remains closed, while the exhaust valve opens to allow

are forced down, applying mechanical force on the

the air under pressure to be exhausted from the brake

diaphragm. The exhaust valve spring Is weaker than the

chambers to release the brakes.

Intake valve spring, so the exhaust valve is forced

downward onto its seat before the Intake valve Is

opened. When the intake valve opens, air from the

e. Brake Chamber. The brake chamber (fig. 34-36)

reservoir Is allowed to flow through the brake valve to the

converts the energy of the compressed air Into

brake chambers to apply the brakes. When the air

mechanical force to operate the brakes. Air

pressure below the diaphragm overcomes the

TA233882

mechanical

34-36