The hydraulic pump transmission shaft cannot withstand radial and axial forces, so it is not allowed to directly install pulleys, gears, and sprockets at the shaft end. Usually, a coupling is used to connect the drive shaft and pump transmission shaft. If due to manufacturing reasons, the coaxiality between the pump and the coupling exceeds the standard, and there is deviation during assembly, the centrifugal force increases the deformation of the coupling as the pump speed increases, which in turn increases the centrifugal force. Causing a vicious cycle, the result is vibration and noise, which affects the service life of the pump. In addition, there are also factors such as loose coupling pins that are not tightened in a timely manner, and rubber rings that are worn and not replaced in a timely manner.
