20 Most Recent Hayward 1.5 Hp Northstar High Performance Pump Questions & Answers

Old or new pump?

If new, not much. Other than some kind of insulation, but it needs to have air circulation.

If old, then your bearings are wearing out and eventually it would be louder and then will seize up.

Hayward 1.5 Hp... | Answered on May 11, 2015

The pump seal is bad on the unit. This requires disassemble of the pump unit. Remove power to the unit, dissasemble pump housing, remove the impeller from the shaft of the motor by removing the allen screw with an allen wrench. Seperate pump housing from motor remove the old seal replace seal. Lube motor shaft with a little clean oil or wd40 to facilitate easy install thru new seal,reassemble in reverse.

Hayward 1.5 Hp... | Answered on Nov 18, 2014

check impeller by turning shaft with pliers sounds as if its stuck do this while of and try to restart

Hayward 1.5 Hp... | Answered on Oct 23, 2014

open it up and see if the impeller will turn freely when it is disconnected from power. Call pool guy or pool store and see if it just needs a solenoid.

Hayward 1.5 Hp... | Answered on Sep 22, 2014

Thank you for posting your question here on Fixya.com.

It could be the pump is bound up but it is more likely the motor is failing. It may be a small part such as the capacitor or the starting switch, but could also be more severe such as the winding itself. You will also want to examine the shaft where it passes thru the pump and motor and look for signs of rust from a pump seal leak.

If you are not familiar with testing these parts your best bet would be a local electric motor repair shop to see if the motor can be repaired or if it would need to be replaced. They should also be able to ensure there is no pump damage. Otherwise please reply with specific questions about what you find for more direction.

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!


Hayward 1.5 Hp... | Answered on Jul 22, 2014

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.

Hayward 1.5 Hp... | Answered on Jun 17, 2014

Bearings are seizing and not spinning freely. That is common when a shaft seal starts to leak & goes uncorrected.

The sound you are hearing are the failing bearings. This will also create the symptoms you described.

Replace the bearings & you will have the problem corrected.

There are two of them: front and rear - both are different sizes. They will look similar to this:


Hayward 1.5 Hp... | Answered on Jan 27, 2014

The lock ring must be placed over the center of the motor before both the electrical and the seal plate and mounting bracket are assembled. When putting the pump back together the ring needs to be on the pump side of the motor support bracket.

These pumps can be a major pain to put together. If there is enough "leash" on the wiring, I undo the suction and pressure side unions (where the pipes attach to the pump) and stand the pump on its nose so gravity helps the motor ass\'y slide into the pump housing. Use lots of magic lube on the o-ring and inside the housing.

The Northstar pumps are hard on motors. In my experience, three to four years is the common time frame for motor failure. Typically a motor should be expected to last 8-10 years.

Hayward 1.5 Hp... | Answered on Dec 02, 2013

Compare old and new impellers, the new one must be bigger. Return it for the correct one.

Hayward 1.5 Hp... | Answered on Dec 01, 2013

Have you looked at the vanes in the impeller? if they are significantly clogged nothing will pump or flow.

Hayward 1.5 Hp... | Answered on Nov 21, 2013

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