9184686 Hydraulic Pump Assy for Hitachi ZX450 ZX470LC-5G 6WG1

It is the power component of the hydraulic system. It is driven by an engine or electric motor. It sucks oil from the hydraulic tank, forms pressure oil, discharges it, and sends it to the actuator.

Hydraulic pump, definition: a hydraulic system power component driven by an engine or electric motor that converts mechanical energy into hydraulic energy .

Common large and medium-sized excavators generally combine piston pumps (plunger pumps) and gear pumps to form a hydraulic pump assembly. Generally, the main pump is a piston pump, which has a higher output hydraulic oil pressure and supplies oil to the hydraulic travel motor, hydraulic rotary motor, and hydraulic cylinder; the pilot pump is a gear pump, which has a lower output hydraulic oil pressure and supplies oil to the distribution valve.

The common point between piston pumps and hydraulic pumps is that they both generate pressure on the liquid by changing the volume. Their differences: different mechanisms and different volume positions. The liquid volume of the gear pump is between the two gears, and the liquid volume is changed by the rotation of the gears, while the volume of the piston pump is in each plunger cylinder.