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1.故障现象1台23t级液压挖掘机,做动臂提升或回转单独动作都正常。做动臂提升兼回转复合动作时,若回转先停止,动臂继续提升,没有异响和冲击;若动臂提升先停止,回转机构会突然加速运动,产生液压冲击,并发出异响。2.工作原理该挖掘机动臂及回转液压回路主要由前泵1、后泵2、先导泵3、先导溢流阀4、主溢流阀5、
1. Symptom 1 Taiwan 23t hydraulic excavator, do boom lift or slewing separate movements are normal. Do boom lifting and rotary composite action, if the slewing first stop, booms continue to improve, there is no abnormal sound and impact; if the boom to lift the first stop, the revolving mechanism will suddenly accelerate the movement, resulting in hydraulic impact and abnormal sound. 2. Working principle The excavator boom and rotary hydraulic circuit mainly consists of front pump 1, rear pump 2, pilot pump 3, pilot relief valve 4, the main relief valve 5,