在设备的液压系统中,各种元件和辅助装置的机构以及油液大都在封闭的壳体内和管道内,不能象机械传动那样较直观地从外部观察,在测量方面又不如电路那样方便,因此在出现故障时,故障原因的诊断与排除都比较困难。而且相同的故障现象产生故障的原因也不一样,因而在实际工作中,往往不能一次就准确地判 In the hydraulics of the equipment, the mechanisms of the various components and auxiliary devices, as well as the oil, are mostly in enclosed enclosures and ducts and can not be seen visually from the outside as mechanically as mechanical transmission, and are not as convenient in terms of measurements as circuits In the event of failure, the cause of the diagnosis and troubleshooting are more difficult. And the same fault phenomenon causes failure is not the same, so in practical work, often can not be accurately sentenced