I have a goulds 1 hp with J10S and since I opened the impeller casing to clean the insides including the impeller I noticed that after re-assembling everything back it does not generate as much pressure and therefore volume vs. before I opened the casing. Is there something I should particularly look for when assembling back to make sure that no compression loss will happen?

Orson

Are you saying that it won't pump up to the cut off pressure in the control box? What pressure did you have before and whar did it drop to? Back to you, Tom