2055283 Original Loader Gear Pump for ZW220

Part number 2055283 is a genuine gear pump produced by Hitachi Construction Machinery Co., Ltd. in Japan. A support chain (walking) system specifically designed for crawler excavators or bulldozers, typically used as a supplementary oil pump, pilot pump, or lubrication pump for the walking motor. It is mainly suitable for the walking hydraulic circuit of Hitachi ZX series (such as ZX200, ZX330, etc.) crawler excavators.

This product is a gear pump used for walking systems. The pump body is a silver brown metal casting with precision machining marks on the surface. The inlet and outlet ports are standard flanges or threaded interfaces, and the drive shaft end has internal or external splines for connecting with the power take-off device. Its core function is to provide stable flow of hydraulic oil for specific walking hydraulic circuits.

Daily inspection: Check the pump body for abnormal noise, vibration, overheating (shell temperature ≤ 80 ℃), and leakage at the joint surface and shaft seal every 250 working hours. Fault diagnosis: If the corresponding walking function has slow, weak or oil replenishment pressure alarm, after troubleshooting the filter element and main valve problems, it is necessary to check whether the output flow rate and pressure of this gear pump meet the standards. Replacement timing: When the pump experiences severe internal leakage leading to insufficient pressure/flow, continuous oil leakage at the shaft seal, or severe wear of the drive shaft spline, it needs to be replaced as a whole.