Question about Hayward Northstar Dual Speed Max Rate 2 Hp Pump

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Hayward Northstar 3 HP pump for waterfall too noisy

I have a pump that is way too loud! I've rebuilt the motor, changed out the impeller, slip ring and all o-rings but nothing seems to help. I also put a valve on the outlet side of the pump to create some back pressure since the system is not filtered. It helped a little bit but you cannot restrict the flow too much before the pipes start shaking. Any ideas????

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Did you put the slip ring in with the wide end out? This slides foreward when the pump runs and seals the presure side of the impeller from the suction side. If this is not right it can create a lot of cavation noise. I don't know how long this has been a problem but if you just put this in a 3hp pump is a lot and will need a 3" suction on most runs and at least 2.5" on the presure side depending on the run. I hope this helps.

Posted on Oct 05, 2009

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I am rebuilding a Northstar pump. I thought I had an o-ring between the diffuser and the impeller ring when disasembling. I don't see the on the schematic however.


The impeller ring moves freely and does not use an o ring. The front of the diffuser does have one. It sounds like they gave you an extra. BTW I have found that Northstar pumps get about 4 years out of their motors. That is about half the average life. I hope you are getting longer than 4 years. If not, it may be worth changing to a different pump.

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1 Answer

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1 Answer

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You didnt mention removing the impeller before trying to "slide it out" Remove the impeller and diffuser first before trying to seperate the two pieces. Lock onto the rear shaft with a 7/16th" wrench while rotating the impeller counter clockwise until remoed. Now you can seperate the two halves.

Apr 21, 2011 | Hayward 1.5 Hp Northstar High Performance...

1 Answer

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wow, thats odd. If you replaced every seal/o-ring and its still leaking its gotta be 1 of 2 things

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1 Answer

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2 Answers

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WELCOME TO THE DREADED NORTHSTAR..THEY FAILED TO PUT A LOCKING SCREW ON THE IMPELLERS ON THESE WITH A MOTOR THAT CAN RUN IN REVERSE ON A WHIM . SO WHAT ITS DONE IS MUCKED UP THE THREADS ON THE IMPELLER.. YOU WILL FIND THAT THIS IS THE HARDEST PUMP TO WORK ON ! PARTS $$$ CRAZY .. I SEE A NEW PUMP IN YOUR FUTURE ,, A STA-RITE DURA GLASS !....; WHEN GETTING A NEW PUMP TELL THE THE HP AND SF SERVICE FACTOR OF THE HAYWARD YOU HAVE SO YOU GET THE RIGHT SIZE PUMP FOR YOUR NEEDS ..GOOD LUCK AND VOTE FOR ME...JAY

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1 Answer

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If you have a crack in your basket you may have a clogged impeller. With the power off reach back into the pump through the pump pot with a long screwdriver and feel around. If it feels spongey it there you have a clog. Take the serew driver an use an oceleting motion in a counter clockwise direction this should loosen the clog then reach in with a long set of thin pliers and pull the clog out. This should fix your problem and once water is flowing your pump should quiet down.

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1 Answer

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1 Answer

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