目前建筑施工单位拥有的液压工程机械数量越来越多,使用范围越来越广。但液压工程机械进入建筑施工现场的历史不长,使用和维修都缺乏经验,所以当液压传动系统发生故障后往往不能及时正确地判断出损坏的“病因”,致使故障得不到及时排除,甚至由于判断错误把完好的液压元件更换掉,却把损坏了的元件 At present, construction units have more and more hydraulic construction machinery, the use of more and more widely. However, the hydraulic construction machinery has not long history of entering the construction site and has a lack of experience in operation and maintenance. Therefore, when the hydraulic transmission system fails, it often can not correctly determine the cause of the damage in time, causing the failure to be eliminated in time or even Because of the wrong judgment to replace the intact hydraulic components, but the damaged components