The impeller must first be removed in order to replace the seal, shaft or front bearing. To do this, grasp the impeller to prevent it from turning with one hand while loosening the nut with the other. It is strongly recommended that a strap wrench or rag be used to hold the impeller in place. A socket wrench or an offset box wrench can be used to loosen the nut.

Once the nut is removed, attempt to lift the impeller. If it adheres to the shaft, gently tap the shaft with a screwdriver handle while pulling upward on the impeller. Scale buildup between the shaft and the impeller is often caused by the moving fluid during operation.