COMPONENT OPERATION / Pump Device OUTLINE The pump device consists of main pumps (1, 2), pilot pump and fan pump. The engine output is transmitted via the coupling. Af- ter being distributed by the gear, the engine power drives the pumps respectively. The reduction gear ratio of engine and main pump (2) is 1:1, engine and main pump 1 / pilot pump is 1:32/31, and engine and fan pump is 1:1. The main pump is a swash plate type variable dis- placement plunger pump. The two main pumps arranged in parallel supply high-pressure oil for work to the main circuit. The pilot pump is a gear pump and supplies pressure oil to the pilot circuit.
The fan pump is a swash plate type variable dis- placement plunger pump and supplies pressure oil to the fan motor. Regulator Main Pump 1 Regulator T1J1-03-01-028 Main Pump 2 Fan Pump Pilot Pump T3-1-1