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Impeller tightens on Aqua-Flo Series A brass pool pump

I installed new seals on an Aqua-Flo Series A brass pump (seal part no. PS-1000 per many cross-references and my pool store) and only hand-tightened impeller back on to the shaft, but when motor turned on it screwed the impeller onto pump bracket so tight it could not turn. Is there another part like a spacer that I may have lost on disassembly or is the seal the wrong part? I kept the old seal and it looks the same but have not removed the new one for an exact comparison because that would likely ruin the new one. I can't find any documetation on the clearance between the back of the impeller and the bracket should The pool store is closed today and I need to get the pump running ASAP.

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Thank you for posting your question here on

There is no spacer. The impeller's internal nut and the shaft's shoulder set the spacing. The most likely problem is either the spring portion of the seal is not fully seated into the pump housing or the ceramic portion not fully seated into the impeller. You should also be sure you removed ALL of the old seal and parts. Many people leave the ceramic's boot in place and then the new seal seat will not seal properly.

If this answer does not fix your problem, please comment with additional details prior to rating the answer. Positive feedback is appreciated once your problem is solved!


Posted on May 15, 2010

Testimonial: "Thanks for the prompt response. You solved my problem! The spring seal was not seated all the way but it was not obvious to me - maybe a 64th of an inch made the difference."


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you will need to remove the back cover on the motor and the suction side cover to expose the impeller. You'll need to hold the shaft from turning and remove the impeller by turning counterclockwise. Some impellers will have a phillips head screw in the center, if so, you can remove it by turning it clockwise. Once the impeller is removed, you can loosen the through bolts and it will all come apart. You can install the new seal and reverse the process to put back together. Hope this helps.

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If you had any blow back when the power went off then the impeller might have spun off the shaft of the motor. If you take it apart the impeller should be almost touching the pump seal plate. It should also be even against it. If it is uneven or has a space behind it you might have to replace it. Also you can check the "O" rings inside the pump to see if your bleeding pressure back to the suction on the pump. I hope this helps.

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Thank you for posting your question here on

The rotating assembly, with the spring, goes on the back of the impeller with the shiny carbon face away from the impeller. That face mates to the white ceramic face of the stationary portion. The rubber (black) boot seals the white ceramic into the pump housing. The cardboard 'ring' is provided to allow you to press in the stationary portion without touching it. You DO NOT want to touch either seal face (The shiny parts that rub against each other once you are done). Doing so can cause a brand new seal to leak.

If this answer does not fix your problem, please comment with additional details prior to rating the answer. Positive feedback is appreciated once your problem is solved!


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