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1台W4-60型轮式挖掘机使用多年后,出现各处密封件老化、操纵阀组磨损严重现象。在更换液压缸油封、修复操纵阀组后,挖掘机斗杆及铲斗动作正常,但是动臂出现举升速度缓慢、不能回落故障。1.故障排查(1)判断故障部位从液压油路可知,动臂和铲斗均为甲泵与乙泵合流供油。由铲斗工作正常,判定液压泵至阀组油路工作正常,
A Taiwan W4-60 type wheeled excavator after many years of use, there seal aging everywhere, control valve group wear serious phenomenon. After changing the oil seal of the hydraulic cylinder and repairing the control valve group, the excavator arm and dipper are operating normally, but the boom appears to raise slowly and can not fall back to failure. 1. Troubleshooting (1) to determine the fault location from the hydraulic circuit we can see, booms and buckets are a pump and B pump confluence for oil. Working normally by the bucket to determine the hydraulic pump to the valve manifold working properly,