The hydraulic pump is a power component of the hydraulic system, and is driven by an engine or an electric motor to suck oil from the hydraulic oil tank to form a component that is discharged to the actuator. The hydraulic pump is divided into a gear pump, a plunger pump, a vane pump and a screw pump according to the structure. A hydraulic component that supplies pressurized liquid to a hydraulic drive and is a type of pump. Its function is to convert the mechanical energy of a power machine (such as an electric motor and an internal combustion engine) into the pressure energy of a liquid. There are many factors affecting the service life of the hydraulic pump. In addition to the design and manufacturing factors of the pump itself, it is also related to the selection of components related to the pump (such as couplings, oil filters, etc.) and the operation during the test run.