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一台W4-60C挖掘机,大修后使用时间不长即出现支腿收放缓慢直至无法收放的现象。 检修时,首先判断故障部位。将支腿缸液压回路上多路换向阀处的控制左支腿缸与铲斗缸的先导油管分别对换,再操纵铲斗缸的先导手柄,发现左支腿收放自如,而在操纵左支腿缸的先导手柄时,铲斗缸却无任何动作。按上述方法测试右支腿缸时,情况同测试左支腿时相同。由此可判定,故障应在先导回路上。
A W4-60C excavator, overhaul after a short time that the legs retract slowly until it can not retractable phenomenon. Maintenance, the first to determine the fault location. The hydraulic control valve on the leg cylinder hydraulic circuit at the left leg cylinder and the bucket cylinder of the pilot pipe were swapped, and then manipulate the bucket cylinder pilot handle and found the left leg retractable freely, and in the manipulation Left leg cylinder pilot handle, bucket cylinder without any action. When testing the right leg cylinder as above, the situation is the same as when testing the left leg. It can be determined, the fault should be in the pilot circuit.