When China hydraulic jacking fails, its frequency characteristics will change with the fault, but the fault characteristics are not obvious, and most of the frequency characteristic information in the normal working signal of the hydraulic system will still be retained in the fault signal, making it difficult to find the fault.

China hydraulic jacking hydraulic fault characteristics are not clear is the current hydraulic system fault vibration diagnosis application problem, the hydraulic fault is characterized by the fault signal still retains most of the frequency characteristic information of the normal working signal, the fault feature is not obvious, difficult to diagnose.

(1) Common faults. The so-called common failure refers to the failure of the same nature that often occurs on the system and components of various hydraulic equipment. This kind of failure is mostly reflected in crawling, air intake, hydraulic shock, noise and vibration.

(2) Reason failure. China hydraulic jacking rational failure refers to the unreasonable design of the hydraulic system, or the design is not perfect, and the structure of the hydraulic components is also unreasonable in design, or inappropriate selection, and then cause failure. For example, if the constant flow rate of the overflow is selected to be small, the overflow valve may be overloaded, resulting in harsh sounds and the like.