4613489 Original Excavator Hydraulic Parts Arm Front Piping Stop Valve for Hitachi ZX450 ZX470-3 ZX4

Part number 4613489 is a specialized part number for the hydraulic system arm front pipe shut-off valve of Hitachi's original excavator. This valve is a manual switch valve installed on the hydraulic pipeline at the end of the excavator boom (boom). Its core function is to quickly cut off the hydraulic oil path to the working device (such as the hammer and bucket cylinder) when disassembling the hammer, replacing the hydraulic cylinder, or repairing the front-end pipeline of the boom, preventing a large amount of hydraulic oil leakage and ensuring maintenance safety. As an original standard component, it is mainly suitable for Hitachi's multiple series of medium and large hydraulic excavators, especially for models often equipped with breaking hammers, such as the ZX series (such as ZX200, ZX330, ZX350) and EX series (such as EX200, EX300).

The front pipe shut-off valve of the arm belongs to a high-pressure hydraulic manual ball valve or plug valve. Its core structure includes a valve body, valve core (spherical or conical plug), operating handle (usually lever type), and inlet and outlet threads or flange interfaces. The valve body is usually forged or precision cast from high-strength alloy steel, with the internal valve core surface hardened and equipped with high-pressure, oil resistant, and aging resistant seals (such as polytetrafluoroethylene or special rubber). When operating, the hydraulic pipeline can be fully opened or closed by rotating the handle 90 degrees. As an original component, its design can withstand the high working pressure (usually up to 35MPa or more) and frequent impact loads of excavator hydraulic systems, and has an extremely low internal leakage rate.

The maintenance core of this globe valve is to ensure its flexible operation and reliable sealing. Regular inspection and operation testing: It is recommended to check whether the valve handle rotates smoothly and whether there is any jamming every 500 working hours or every time accessories are replaced; At the same time, check for oil leakage in the valve body and connections. Operation standard: Before carrying out maintenance, be sure to rotate the valve handle 90 degrees to the "OFF" position to cut off the oil circuit. When operating, apply force steadily and avoid using an extended rod to forcefully pull, in order to prevent damage to the internal valve stem or seals. Sealing maintenance: If leakage is found at the valve body interface or valve stem, the corresponding O-ring or sealing gasket should be checked and replaced.