9195238 Original Excavator Hydraulic Pump Assembly for ZX330

The original hydraulic pump assembly (part number 9195238) is the core power component of the hydraulic system of Hitachi ZX330-3 series medium-sized excavators, mainly used to provide high-pressure hydraulic oil source for the whole machine, drive the working device, slewing and walking mechanism. This pump is also widely used in Hitachi ZX330-3G, ZX350-3, ZX360-3 and other series of third-generation models. Its universal number 9195241/YB60000253 is its identification in Hitachi's original accessory system, corresponding to the pump model HPV145. When ordering, the complete model, serial number, and hydraulic pump identification code of the excavator must be provided for verification to ensure that the installation interface, displacement, and control method are completely matched.

This product belongs to the dual variable axial piston pump+gear pump combination assembly specifically designed for construction machinery, adopting a split inclined shaft piston pump design. The displacement of a single plunger pump is about 145 cc/rev, the maximum total flow rate of a dual pump is 2 × 288 L/min, the auxiliary flow rate of a gear pump is 30.2 L/min, the rated working pressure is 34.3 MPa, and the peak pressure is ≥ 35 MPa. The pump body is made of high-strength alloy cast iron, and the precision of the plunger and cylinder hole fit is ≤ 0.005 mm. The surface of the distribution plate is treated with nitriding, which has excellent wear resistance. The control mode supports pressure flow power composite regulation, achieving precise matching of flow and pressure through pilot oil pressure (3.9 MPa) and electric proportional valve. The original pump is compatible with the Isuzu AH-6HK1X engine, with a rated speed of 1900 rpm, and can operate stably for a long time in the oil temperature range of -30 ° C to+100 ° C, with a noise level of ≤ 85 dB (A).

It is recommended to check the tightening torque of the pump body installation bolts (usually 200-300 N · m) and the sealing status of the inlet and outlet joints every 250 hours of work. The hydraulic oil and oil suction/return filter element must be replaced after the first 500 hours of work, and the subsequent replacement cycle should not exceed 2000 hours (shortened to 500 hours for dusty conditions). Daily monitoring of oil temperature (preferably 30-60 ° C, prohibited from exceeding 65 ° C) and oil cleanliness (NAS level 9 or below) should be carried out to avoid air suction and cavitation.