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1.故障现象1台以旧换新回收的大宇DH220LC-5型二手挖掘机,在检查时发现如下2项故障:一是行驶无力且行走跑偏,当通过坡形引导板上平板拖车时,跑偏更为明显,用行驶手柄都无法纠正行驶方向。二是动臂挖掘无力,无法使用动臂下降的方法将挖掘机自身撑起。2.工作原理该挖掘机工作油路由P1、P2泵供油,其主溢流阀设定压力为32MPa。P1、P2泵输出的压力油从P1、P2口进入主控制阀,P1泵为左行走阀、回转阀、
1. Trouble phenomenon Recycling of Daewoo DH220LC-5 second-hand excavators, found in the inspection of the following two failures: First, driving weak and walking deviation, when through the slope-shaped guide plate on the flatbed trailer, more deviation Obviously, with the driving handle can not correct the driving direction. Second, boom excavation weakness, unable to use the method of lowering the boom excavator itself propped up. 2.Working principle The excavator working oil from P1, P2 pump oil, the main relief valve set pressure 32MPa. P1, P2 pump output pressure oil from the P1, P2 into the main control valve, P1 pump for the left-hand valve, rotary valve,