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1.故障现象1台装有德国力士乐负载敏感压力补偿(LUDV)液压系统的某型8t挖掘机,在工作过程中出现向左回转速度缓慢故障。正常情况下左、右回转速度均为10.5r/min,实际检测发现向右回转速度正常,向左回转速度仅为8r/min,该机工作装置工作及行走均正常。2.工作原理该挖掘机回转液压回路主要由液压油箱1、主泵2、减压阀3、先导阀4、主阀5、补油单向阀6、回转溢流阀7、回转马达8、回转减速器9、主溢流阀10组成,如图1所示。
1. Symptom 1 type of 8t excavator equipped with German Rexroth LUDV hydraulic system has slow turning left turning speed during working. Under normal circumstances, the left and right rotation speed are 10.5r / min, the actual test found that the right rotation speed is normal, the left rotation speed is only 8r / min, the work of the machine working and walking are normal. 2. Working principle The excavator rotary hydraulic circuit is mainly composed of a hydraulic tank 1, a main pump 2, a pressure reducing valve 3, a pilot valve 4, a main valve 5, a charge check valve 6, a swing relief valve 7, a swing motor 8, Slewing reducer 9, the main relief valve 10 composed of, as shown in Figure 1.