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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.

I do find a raised ring of plastic on the diffuser in the seat area of the impeller ring that does fit the o ring. (I know about the o ring that fits on the end of the diffuser at the strainer end of the pump). 2 o rings came with the impeller/seal kit. It is just that I don't see the one in question on the parts break out.(schematic).

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  • 372 Answers

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.

Posted on Jan 05, 2013

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Posted on Jan 02, 2017

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SOURCE: I have a Hayward Northstar

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

You installed the shaft seal wrong- no disrespect, just a possibility

or there is a hairline crack somewhere you are missing...

Posted on Aug 23, 2010

Testimonial: "The shaft seal ould be a possibility but I think I'm OK there. However, I did check the pump again today and there was NO LEAK. Thanks anyway"

  • 366 Answers

SOURCE: Cleaned clogged impeller-now can't get

use either alladin magic lube or lube tube. you should lube the large o-ring on the seal plate as well.

Posted on Aug 14, 2011

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1 Answer

Engine knocking noises


Impeller could be plugged?
Diffuser may have become misaligned and hitting the impeller?
May have sucked up some foreign debris?
Knocking could be a bad bearing.

Mar 23, 2014 | AO Smith 1.5 hp 3450rpm 56J Frame 115/230...

1 Answer

How do I fix the seal?


please follow this steps . God bless you
  1. Turn off the pump motor and close the input and output valves.
  2. Loosen the fasteners that secure the tube connecting the pump and motor.
  3. Move the motor away from the pump housing.
  4. Remove fasteners holding the diffuser to the backplate.
  5. Inspect the diffuser and O-ring for wear, replacing as needed.
  6. As needed, remove fasteners attaching the impeller to the shaft. Alternately, the impeller may be screwed on to the end of the shaft.
  7. Remove the impeller and seal from the shaft.
  8. Inspect and replace the impeller and seal.
  9. Reassemble the pump.
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Nov 23, 2013 | Hayward Sp2607x10 Super 1 Hp Swimming Pool...

1 Answer

Get hayward pump apart model sp4010ns


I have had Northstar pumps apart but it has been a while. I found a narrative written by another expert, macdirk, describing how to replace the motor and here it is.

In order to remove the motor, first turn the motor locking ring. This holds the too halves of the pump together. There should be a small tab you have to press in, then grab the round handle, and spin the outer sleeve to unlock. Once you do this the back half of the can be pulled away. This can be very hard sometimes. If the pump and motor still work, you can flip the switch on for a sec or two, and it will pop the back half away from the front half. If the motor is not working then you'll just have to twist, wiggle and pull till you get it apart. After this make sure the power is off, breaker off, etc. and you can remove two screw from the plastic cover on the tail of the motor and disconnect the wires, and remove that half the pump. Next step is to just pull off the diffuser, which may actually have stuck inside the front half the pump. Next remove the impeller, by unscrewing while locking the shaft from the rear with a wrench. if there is a screw in the center of the impeller threaded into motor shaft remove that first. This should be a left handed thread, so unscrew by turning clockwise. The impeller should unscrew counter clockwise like normal. Next remove the seal plate. That should expose 4 bolts holding the motor to the motor mounting plate. Once you remove this you can remove the old seal, clean, and install new seal. you should replace the diffuser and seal plate o-ring as well. Normally I don't recommend a lot of lube on o-rings, but this one can be a ****** to get back together, so use plenty of lube. As I said getting the back half inserted back into the front half is a pain, so you'll just have to work it. Make sure the motor locking ring is forward of the mounting brace that sits on the ground. This can be hard, but if you get it at the right angle it will go raight in place. Make sure the diffeser and/or diffuser o-ring does not slip off into the pump housing when your trying to get it lined up and back into place. There is a notch in the housing and seal plate that have to line up. Sometimes a clamp or ratcheting strap can be used to help pop the two halves back together.
Now all that being said.... it might be worth it to just take the whole pump in to a pump repair shop and let them rebuild it, or put a new motor and seals for ya. At least check the price and consider it. This pump has unions to install it so there is no pipe work required to remove the whole darn thing. Good Luck, and let me know if you have more questions.


I hope this helps.

Aug 27, 2011 | Hayward 1.5 Hp Northstar High Performance...

1 Answer

I'm trying to remove the motor from the back of my Hayward pump (Northstar). I've loosened the large, round locking housing that secures the motor to the pump. It appears the motor should now just slide...


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

Replacing motor only how do I unassemble motor from empeller


In order to remove the motor, first turn the motor locking ring. This holds the too halves of the pump together. There should be a small tab you have to press in, then grab the round handle, and spin the outer sleeve to unlock. Once you do this the back half of the can be pulled away. This can be very hard sometimes. If the pump and motor still work, you can flip the switch on for a sec or two, and it will pop the back half away from the front half. If the motor is not working then you'll just have to twist, wiggle and pull till you get it apart. After this make sure the power is off, breaker off, etc. and you can remove two screw from the plastic cover on the tail of the motor and disconnect the wires, and remove that half the pump. Next step is to just pull off the diffuser, which may actually have stuck inside the front half the pump. Next remove the impeller, by unscrewing while locking the shaft from the rear with a wrench. if there is a screw in the center of the impeller threaded into motor shaft remove that first. This should be a left handed thread, so unscrew by turning clockwise. The impeller should unscrew counter clockwise like normal. Next remove the seal plate. That should expose 4 bolts holding the motor to the motor mounting plate. Once you remove this you can remove the old seal, clean, and install new seal. you should replace the diffuser and seal plate o-ring as well. Normally I don't recommend a lot of lube on o-rings, but this one can be a bugger to get back together, so use plenty of lube. As I said getting the back half inserted back into the front half is a pain, so you'll just have to work it. Make sure the motor locking ring is forward of the mounting brace that sits on the ground. This can be hard, but if you get it at the right angle it will go raight in place. Make sure the diffeser and/or diffuser o-ring does not slip off into the pump housing when your trying to get it lined up and back into place. There is a notch in the housing and seal plate that have to line up. Sometimes a clamp or ratcheting strap can be used to help pop the two halves back together.
Now all that being said.... it might be worth it to just take the whole pump in to a pump repair shop and let them rebuild it, or put a new motor and seals for ya. At least check the price and consider it. This pump has unions to install it so there is no pipe work required to remove the whole darn thing. Good Luck, and let me know if you have more questions.

Sep 21, 2010 | Hayward 1.5 Hp Northstar High Performance...

1 Answer

I have a Hayward Northstar 2hp pump that is leaking apparently from the Seal Plate. I replaced the Seal Plate O-Ring, Diffuser O-Ring, Impeller Ring, and Seal Assembly but it continues to leak. I used...


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

You installed the shaft seal wrong- no disrespect, just a possibility

or there is a hairline crack somewhere you are missing...

Aug 22, 2010 | Hayward 1.5 Hp Northstar High Performance...

1 Answer

My pump works but there is only 2 pounds of pressure. I cleaned the filter but it won't keep the pressure.


If all valves are open, check the pump strainer basket. If that is clear, I would check the pump impeller for any debris in it. You have to open the pump but it is fairly easy. The impeller will be behind the diffuser.

Jul 19, 2010 | Hayward 1.5 Hp Northstar High Performance...

2 Answers

My Hayward pool pump was humming, but I got it running. Now it is not pulling water into the filter. Does anyone know what the problem could be?


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

I have a Hayward Northstar 2HP pool pump. I need


If the motor still runs at all start the pump with the lock off and it will pop out. If not use some liquid soap and a small straw like a capalery tube on wd. Any thing small enough to fit through the space you can get when you pull the seal plate back, their is an inner plate with an "O" ring and you need to get the soap to that then let it sit for half hour or so and go back to the side to side prying when the soap and the "O" ring come together it will slide right out.

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