SEAL 1465291 - Caterpillar

Air Compressor Operation
TYPICAL AIR COMPRESSOR SYSTEM
1. Air tank. 2. Coolant line to engine. 3. Air line from the air inlet manifold for the engine. 4. Coolant line from engine. 5. Air line to air tank. 6. Air line to unloader valve in head assembly. 7. Air governor. 8. Pressure gauge. 9. Air line to air governor. 10. Air compressor. 11. Oil line from engine for lubrication. 12. Oil outlet to engine. 13. Air line to components that need air for operation.The air compressor (10) is a pump that fills tank (1) with air. The crankshaft in the air compressor is driven by the engine and the air compressor operates when the engine is running. The head assembly gets the coolant from the engine. The coolant goes through a line (4) connected to the coolant manifold from the water pump of the engine. The coolant goes through the head of the air compressor and through a line (2) to the coolant manifold to the radiator of the engine.When the crankshaft is turning, it moves a connecting rod and piston up and down in the cylinder of the air compressor. When the crankshaft moves the rod and piston down, the inlet valve in the head assembly opens and air from the inlet manifold of the engine goes through a line (3), through the open inlet valve and into the liner of the air compressor. As the crankshaft turns farther it moves the rod and piston up and the inlet valve closes and the exhaust valve opens. The piston pushes the air from the cylinder through the open exhaust valve and through a line (5) to the air tank (1). The movement of the crankshaft, rods and piston puts more and more air into the tank and the pressure of the air gets an increase. The air in the tank is also in the line (9) to the air governor (7) and in the line to the pressure gauge (8).The air compressor puts air into the tank (1) and in line (9) until the increase in the pressure of the air gets to the cut out pressure setting of the air governor (7). The pressure of the air now moves a plunger in the air governor and the air from the tank through air line (9) goes through the open valve in the air governor, through a line (6) and into the unloader valve in the head which moves the inlet valve open. As the air compressor piston moves down, air from line (3) goes through the open inlet valve into the cylinder. When the piston moves up, the air in the cylinder moves out through the open inlet valve but does not go to the air tank.
TYPICAL AIR COMPRESSOR INSTALLATION
2. Coolant line to engine. 3. Air line from air inlet manifold of the engine. 4. Coolant line from the engine. 5. Air line to air tank. 6. Air line to unloader valve in head assembly. 7. Air governor. 9. Air