(1) When removing the coupling, it is not advisable to directly strike it with a hammer, but instead to pad it with a copper rod and hit the hub of the coupling

And the outer edge of the coupling cannot be damaged because it is easily damaged here. The most ideal method is to disassemble the coupling with a screwdriver. For small and medium-sized water pumps, the coupling is easy to remove due to its small fit interference. For larger water pumps, there is a significant interference between the coupling and the shaft, so the coupling must be heated during disassembly. (2) When assembling the coupling, pay attention to the serial number of the keys (for couplings with more than two keys). When striking with a copper rod, attention must be paid to the striking area. For example, when tapping the end face of the shaft hole, it is easy to cause the shaft hole to shrink, so that the shaft cannot pass through; Knocking on the outer edge of the opposite wheel can easily damage the flatness of the end face, which will affect the accuracy of measurement when aligning with a feeler gauge in the future. For couplings with large interference, they should be heated before installation.

(3) The coupling pins, nuts, washers, and rubber pads must ensure their respective specifications and sizes are consistent to avoid affecting the dynamic balance of the coupling. The coupling bolts and corresponding coupling pin holes should be marked accordingly to prevent incorrect installation.

(4) The fit between the coupling and the shaft generally adopts a transitional fit, which may result in a small amount of interference or a small amount of clearance. For couplings with longer wheels, a loose transitional fit can be used. Due to the long shaft hole and rough surface processing, some interference will naturally occur after assembly. If it is found that the fit between the coupling and the shaft is too loose, which affects the concentricity of the hole and shaft, repair welding should be carried out. Punching spots or placing copper sheets on the shaft is a temporary measure and cannot be used as an ideal method.