PUMP GP-PISTON 5060354 - Caterpillar

Illustration 1 g01262758
Bendix BA-921 air compressor (1) Air inlet (2) Optional coolant port (3) Unloader cap (4) Air pressure relief valve (5) Coolant port (6) Optional coolant port (7) Drive gear (8) Crankcase cover (9) Air pressure relief valve (10) Air discharge (11) Governor connection (12) Coolant portNote: The direction of the coolant flow may be from either direction. The optional coolant ports may be used if the other coolant ports have been plugged.The Bendix BA-921 air compressor has these features.
A cast iron cylinder block
A steel valve body
An aluminum cylinder head
The intake valve is a reed valve.
The discharge valve is a reed valve.
The air compressor is lubricated by engine oil.
The air compressor is controlled by the governor and the unloading mechanism of the compressor. The governor maintains the system pressure for the air brakes. The system air pressure is preset at minimum levels and at maximum levels.
The governor is mounted remotely from the air compressor. The port for the governor is located on the cylinder head of the air compressor.
The air compressor has an unloading system that conserves energy. When the air compressor is in the unloaded position the power requirements for the air compressor are reduced by approximately 70 percent.
The cylinder head of the air compressor contains the inlet valve, the discharge valve, the unloader valve, and the pressure relief valve.
The pressure relief valve protects the air compressor from damage if the discharge line becomes blocked or the governor line becomes blocked or if the compressor unloader valve would fail. The relief valve prevents the compressor from exceeding 1724 kPa (250 psi).