[header] How to replace a swimming pool pump seal [title] Separate the pump housing-most pumps have either a large metal clamp ring or a series of nuts and bolts the hold the pump housing to the motor plate. [step] Using a socket or crescent wrench, remove the nut that is securing clamp together or loosen and remove the series of nuts and bolts. Some banded pumps have a hand knob instead of a nut holding the clamp together. 
Slide back the half of the pump assembly with the motor attached. Try to place the pump on a suitable work surface.