1032517 Excavator Hydraulic Pump Head Cover for Hitachi ZX200-3 ZX200-5A ZX200-5G

Part number 1032517 is the back cover (or top cover) of Hitachi's original hydraulic main pump. According to publicly available accessory information, it is mainly suitable for the medium-sized hydraulic excavators of Hitachi ZX200 series and ZX240 series, with specific models including ZX200-3, ZX200-5A, ZX200-5G, ZAX200-3, ZX240-3, ZAX240-3, etc. This component is a key component of the HPV102 or HPV118 series hydraulic main pump. The original part number is 1032517, which is also associated with YB00002028 and other numbers in some materials. Due to differences in the structure and installation dimensions of different models of hydraulic pumps, this top cover usually does not have a widely used universal part number and must use original parts or rigorously certified equivalent specifications.

The top cover of the hydraulic pump is a key pressure bearing and sealing component of the hydraulic system, located at the rear or outlet end of the hydraulic main pump. Its core function is threefold: firstly, it serves as the rear sealing cover of the pump body, forming a sealed chamber together with the pump body to accommodate core components such as plungers and port plates; Secondly, there is an integrated oil passage on it, which is responsible for guiding and outputting the high-pressure oil generated by the pump to the main control valve; The third is to prevent high-pressure oil from leaking from the rear end of the pump body through precision machining and sealing design.

The maintenance core of this top cover lies in ensuring reliable sealing, regular inspection, and standardized disassembly and assembly. Sealing inspection: Regularly (recommended every 500 working hours) inspect the joint surface between the top cover and the pump body, as well as the joints of each oil port, for any oil leakage. Before installation, the joint surface must be thoroughly cleaned, all sealing rings must be replaced, and clean hydraulic oil or designated sealing grease must be evenly applied. When installing, it is necessary to tighten the bolts step by step according to the specified torque and sequence (usually diagonal cross) to ensure uniform sealing and prevent leakage.