Question about Hayward Northstar 2 - Hp In Ground Pool Pump

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How can it put together a northstart pump? i put it apart to replace the diffuser, but it is to difficult to put it together. I used clamps to push the motor and the pump but it does not close

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  • John Prohaska
    John Prohaska May 11, 2010

    Did you leave the old diffesure gasket in the pump and have a new one on the new diffuser, therefore having too thick a gasket inside?

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  • 128 Answers

Lube the seal plate oring and diffuser oring with magic lube.

Posted on Aug 23, 2009

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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 can't get the two pieces of the pump to fit snuggly enough to get the clamp to fit


The problem is the o-rings. The diffuser o-ring has to fit tight into the volute to go back together correctly. This is a common o-ring and can be found at any on-line supplier. You will need the model number of your pump and they should be able to help you. (you may also e-mail me your model and i can give you the part number: adamh@newconceptchem.com)

As long as you have it open, replace the housing o-ring as well, this will ensure a good seal on the v-clamp once you get it back together. It is a good idea to have these extra two o-rings along with the shaft seal anytime you open the wet end of the pump, just in-case there is bad wear on the current seals.

Nov 15, 2010 | Sta Rite STA-RITE CLAMP ASSY W/ NUT -...

1 Answer

Pump seal is leaking water. I removed the screws holding the pump together. How do I remove the impellor to get at the seal?


This is from one of my previous posts, may be some extra steps, but should cover what you need... Turn off the electric first. Now split the pump in two by removing the large clamp or 4-6 bolts holding the two halves together. (not the 4 bolts holding the motor to seal plate, but the the bolts holding the seal plate to the seal plate housing). Once you remove the clamp or bolts, the motor with seal plate, diffuser, and Impeller can all be pulled back away from the pump. Then disconnect the electrical from the motor and you can pull the motor with the seal plate, and impeller all the way out and work on it. To get to the impeller, you need to remove the diffuser (plastic housing that goes around the impeller) usually by a series of 3 to 6 small screws. To remove the impeller you need to lock the motor and unscrew impeller. Depending on the motor, you remove a cap in the middle of the tail piece and hold with a wrench, or remove a cap that covers the whole end and grab the shaft with a wrench (usually 7/16") by sliding it under the thermal overload switch, or removing the capacitor for even easier access. Once you've locked the shaft, you can just unscrew impeller. If the impeller has a bolt or screw in the middle remove that first. this screw will be reverse thread so make sure you don't turn the wrong way and break or strip. If there is no screw, or after you've removed it, just spin the impeller off (standard thread). If you can't do it by hand and assuming you don't have an impeller wrench, be very careful and use a large pliers, pipe wrench, or strap wrench to loosen it. After that you unbolt the motor from the seal plate, pull the seal plate away from motor (this removes half the seal), and then pop the other half of the seal from the seal plate. Make sure to replace the shaft seal, and use a tiny bit of pool lube on the rubber parts when installing, but keep the white ceramic, and black graphite surfaces 100% free of any dirt, grease, etc while working with them. Installation is pretty much just the reverse. Install half the seal into the seal plate. Install the seal plate onto motor and bolt into place. Install other half of seal onto shaft. Screw impeller onto shaft and install screw (if one was there to start with) in center of impeller (reverse thread). install diffuser over impeller make sure it is centered and doesn't rub the impeller hub. Install new diffuser and valute o-rings. Hookup wiring before re-attaching to rest of pump. Clamp or bolt back together. Pour plenty of water into pot to prime and flip the motor on for a sec or two. Pour some more water. Install pot lid. You should be good to go. Keep in mind there are many different pumps and some variations to the above instructions, but the above should cover most situations. Hope this helps. If you need further assistance post a reply in the comments, and don't hesitate to leave a good thumb rating if you found this helpful. Thanks, and good Luck!

Oct 03, 2010 | Dynamo ABOVEGROUND POOL PUMP - 1.5HP -

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

Im getting a loud buzzing noise when the pump is running


could be an obstruction in the impeller, or the bearings going out. You can split the pump in two be removing the large clamp or 4-6 bolts holding the two halves together. (not the 4 bolts holding the motor to seal plate, but the the bolts holding the seal plate to the seal plate housing. once you remove the clamp or bolts, the motor with seal plate and impeller and diffuser can all be pulled back away from the pump. You need to remove the diffuser (plastic housing that goes around the impeller) usually by a series of 3 to 6 small screws. Now you can easily try and spin the impeller and check for obstructions that might have bound it. If you do not see anything stuck in the impeller, then the noise is likely coming from the motor (probably the bearings) you can replace the motor, or have it rebuilt. if your not gunna rebuild it you can deal with it as long as the noise doesn't bother you and the motor is not getting too hot

Sep 15, 2010 | ADVANTAGE Waterway SVL56 Pool Pump...

2 Answers

How do you replace a seal on a Sta-Rite pool pump? How do you remove the old seal? Ceramic and graphite.


Replacing a shaft seal requires some good mechanical ability.
first, always make sure power is off at the breaker before you work.
You'll have to remove the band holding the wet end to the seal plate. Then remove the diffuser covering the impeller. Remove the cover on the back of the motor. You either need a 7/16 open end wrench or a armature tool to hold the motor shaft while you unthread the impeller (if the impeller has a screw in the middle, you will have to remove it by turning clockwise, left hand threads) counterclockwise. You can then pull the carbon part of the seal off of the impeller, make sure to remove all of it including the metal sleeve. You will then have to remove the seal plate and push the ceramic part out from the back. You can then clean and lube the seal plate and install the new ceramic part of the seal, try not to touch the ceramic with your hands if possible. You can then lightly lube the impeller shaft and slide the carbon part of the seal with the carbon facing toward the ceramic as you thread it on. If the seal plate had a copper heat sink, you can either replace it or use a different size seal. (I believe it's a PS-201) Re-install the seal plate, impeller (and screw if applicable) and diffuser. You should now be ready to mate the seal plate to the wet end. Make sure you fill the pump before you try starting it up, especially with a new (dry) seal.

Aug 14, 2010 | Sta Rite 1 HP Sta-Rite Pump: 1.5" in/out,...

1 Answer

I can not put it together.


If you are talking about reinstalling the motor to the pump. Lube the diffuser oring and seal plate oring with magic lube.. its a silicon lube.

Jul 14, 2009 | Hayward 1.5 Hp Northstar High Performance...

1 Answer

Removal and installation of diffuser and impeller kit


All jucuzzi pumps are some of the most difficult to repair.Pump front should seperate from body(volute) of pump by means of screws, or some kind of band. Diffuser should have ss screws, or
be held in plsce by notches or both. Impellor spins counter clockwise to come off. Can only remove impellor with impellor wrench, or very strong hand. Rear of motor must be held in place with normally a 7-16 wrench, allen head wrench or screwdriver. Depends on manufacturer of motor. Then impellor can be removed!
Should replace shaft seal under impellor. Can seperate body of pump from motor by turning four outer bolts on back of motor. Must mark rear cover of motor so lines up exact for reassebly. Ussually 1/4 inch socket wrench.Seal can be pushed out from back to front with the corrrect size socket and a very light hammer.
Try to factory Jacuzzi seal, they are better than aftermarket.
Coat rubber on seal with light silicone, and press back into place without touching or marring seal face. Best way is use other half of seal (spring piece) to gently but firmly reseat seal. Examine body from rear to make sure seal seats. Reassemble as taken apart, or just take to a qualified service tech at a well established pool/spa place. Kirk

Feb 13, 2009 | Jacuzzi Diffuser, 1 1/2 - 3 Hp...

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