COMPONENT OPERATION / Pump Device OUTLINE Pump device has a main pump (1) and a pilot pump (2), and main pump (1) has a built-in priority valve (6). Driving force of the engine is transmitted to the shaft (3) through the transmission input shaft, and actuates main pump (1) and pilot pump (2). Main pump (1) is a swash-plate type variable displacement axial plunger pump. Pilot pump (2) is a gear pump. Pump delivery pressure sensor (4) is provided for controlling the main pump. T4GB-03-01-001 1 - Main Pump 3 - Shaft 5 - Steering Main Relief Valve 2 - Pilot Pump 4 - Pump Delivery Pressure Sensor 6 - Priority Valve T3-1-1 2 1 5 6 3 4 3 4