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1台神钢250型挖掘机在运行6000h后,作业时突然出现右侧行走无力现象,其他各项动作正常。该型挖掘机行走液压系统由工作回路、限压回路、卸荷回路、节流调速和节流限速回路以及先导阀控制回路等组成。其液压元件主要由工作泵(P1、P2双联泵)、分配器、行走马达、行走减速装置、回转接头、行走速度控制阀、行走先导阀、溢流阀、油箱、油冷器、回油滤芯及相关管路等组成。
A Kobelco 250 excavator in the operation of 6000h, suddenly appeared on the right when walking weakness, the other movements are normal. This type of excavator walking hydraulic system consists of working circuit, pressure limiting circuit, unloading circuit, throttling speed and throttling speed limit circuit and the pilot valve control circuit and other components. The hydraulic components are mainly composed of working pump (P1, P2 double pump), distributor, traveling motor, walking speed reducer, slewing joint, walking speed control valve, walking pilot valve, relief valve, fuel tank, oil cooler, Filter and related piping and other components.