4623111 Original Excavator Knock Pin for Hitachi ZX200-3 ZX240-3 ZX270-3 ZX330-3

Part number 4623111 is a dedicated part number for Hitachi original locating pins. Positioning pin is a key standard component used in construction machinery for precise positioning and fixing of two components (such as pump body and housing, valve block and mounting seat), ensuring alignment during assembly and preventing relative displacement. As a highly versatile standard component, it may be widely applicable to the assembly of hydraulic pumps, motors, valve blocks, and other components in multiple series of Hitachi excavators, such as the ZX series (such as ZX200-3, ZX330) and EX series (such as EX200, EX270)

The positioning pin is a high-precision cylindrical positioning component. Its core function is to insert into the corresponding pin holes of two parts through interference fit or transition fit during component assembly, achieving precise radial positioning and ensuring that there will be no misalignment between components when multiple bolts are tightened, thereby ensuring transmission accuracy, sealing performance, and structural stability. Depending on the purpose, its surface may be treated with phosphating or galvanizing to enhance its rust prevention ability. It can withstand severe vibrations and impact loads during excavator operation, which is the foundation for ensuring the assembly accuracy of key assemblies.

The maintenance core of this product lies in preventive inspection, standardized disassembly and assembly, and associated diagnosis. Regular inspection: It is recommended to check the locating pin for bending, breakage, abnormal wear, or rust every 2000 working hours or during major assembly repairs. If wear is found on the pin body or pin hole, the fit clearance should be measured. Usually, if the clearance exceeds 0.05mm, repair or replacement should be considered. Before installing a new pin, the pin hole must be thoroughly cleaned to ensure that there are no foreign objects, and a small amount of lubricating grease can be applied to the surface of the pin body for pressing in. During installation, a press or specialized tool should be used to press the pin vertically into place, ensuring that it is flush or slightly lower than the end face of the part. Associated maintenance: The failure of locating pins is often related to loose connecting bolts or abnormal vibrations of related components (such as hydraulic pumps and motors).