The fault diagnosis standard of hydraulic equipment has the following characteristics. 1) Numerical. The faults of hydraulic equipment are characterized by characteristic parameters, that is, they are reflected by numerical values, such as in axial piston pumps. 2) Specificity. Due to differences in design and manufacturing, use and maintenance of hydraulic machines, as well as loading and other relevant factors, it is difficult to determine a universally applicable fault evaluation standard. On-site engineering and technical personnel should preferably determine specific fault evaluation standards according to the specific conditions of shearing machine equipment, referring to relevant materials. 3) Relativity. On site, due to possible limitations in testing conditions, it is difficult to fully understand the true situation of relevant parameters in vacuum packaging machines or screw conveyors. However, this is not critical, as fault analysis is more concerned with the relative changes of relevant parameters, such as ejectors. For example, if a certain parameter of a hydraulic device has a certain degree of fault at time T, this is actually using the parameter value at time T as a comparison benchmark. Although this benchmark may not be very precise, it is quite practical. Similarly, if there are two hydraulic devices at the same moment, one is normal and the other has a fault, the parameters of the normal hydraulic device can be used as a judgment benchmark. 4) Approximation. Due to the inherent errors of hydraulic devices and the interference of random factors, the boundaries of hydraulic fault states are difficult to reach a very precise level in some aspects, such as in hollow glass. Instead, it is a rough range. For example, the service life standard of components on equipment is also rough. 5) Systematicness. The systematicness of fault evaluation standards arises because the evaluation of an examination object is carried out from multiple perspectives. Although various evaluations have primary and secondary importance, they are all conducted according to standards. Hydraulic equipment includes hydraulic machinery, hydraulic circuits, hydraulic components, and component parts. Fault evaluations at different levels each have their own evaluation standards, forming a hierarchical system, such as insulating bushings. 6) Applicability. Evaluation standards used for on-site fault analysis must consider whether measurement is feasible, and data limits must have a certain degree of flexibility, like quilting machines.