What components must be removed to change the shaft seal on a close-coupled pump?

In order to change the shaft seal on a close-coupled pump, the motor must be removed. This is because the motor and the pump are coupled tightly together, meaning that the pump's impeller is directly mounted on the motor shaft. To access the shaft seal, which is located at the interface between the motor and the pump, the motor needs to be separated.

Once the motor is removed, it allows for the extraction of the impeller and access to the shaft seal without obstruction. The close-coupled design limits the accessibility to the internal components, hence the priority is to take the motor away first to facilitate the necessary repairs or replacements of seals.

The other components mentioned—such as the impeller, casing, and rotor—are typically not removed prior to accessing the shaft seal because their removal is contingent on detaching the motor first in this specific pump design.