INSULATION 9Z7589 - Caterpillar

Illustration 1 g00435998
(1) Spring (2) Piston (3) Inlet/exhaust valve (4) SpringThe air compressor governor operates with the compressor unloader pistons in the air compressor in order to control the air pressure in the system. The cut-out pressure setting for the air compressor governor is 830 34 kPa (120 5 psi). The minimum cut-in pressure is 655 kPa (95 psi). When the air compressor governor is adjusted, spring (1) will hold the adjustment.When the air pressure that is supplied by the air compressor increases to the cut-out pressure setting, the air pressure moves piston (2) against the force of spring (4). Piston (2) moves inlet/exhaust valve (3) in order to open the passage to the compressor unloader mechanism. The air pressure flows through the air compressor governor to the compressor unloader mechanism. The compressor unloader mechanism stops the flow of compressed air to the rest of the system.When the air pressure that enters the air compressor governor decreases to the minimum cut-in pressure, the force of spring (4) is greater than the air pressure that is acting on piston (2). Inlet/exhaust valve (3) moves in order to close the passage. This simultaneously opens the exhaust opening of the air compressor governor. The air compressor will send compressed air flow to the air dryer.