Question about Polaris Pb4 - 60 Booster Pump

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My Polaris PB4 Booster Pump is frozen...It hasn't been operated in two year and now it's frozen. It hums but will not spin. Is there any way to free it.

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  • John Prohaska
    John Prohaska Sep 13, 2010

    Thank you for posting your question here on Remove the cover in the center of the motor endbell opposite the pump. Doing so will expose the tip of the shaft and it usually will have a 1/2" flatted end. Use a wrench to try and turn the shaft. If it frees up and runs, great. If not, 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. 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! John

  • mbec118907 Sep 15, 2010

    Is there a special technique to removing the center cover?



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On the end of the motor there is a plastic cap. Pop it off. This is the end of the shaft.On mine there is a slot for a flat head screw driver.You can break it loose with that.I gave mine a shot of WD-40

Posted on Sep 13, 2010

  • John Prohaska
    John Prohaska Sep 15, 2010

    There should be two small sections raised slightly off the endbell flange. Use a small enough flat tip screwdriver and a hammer to tap that opening loose until the cap comes off. Try not to distort the cap too much as you work it free because it is friction fit and you will want to reuse it once you are finished. Reinstall it by tapping it back into place with the hammer.

    Do not use oil, WD40 or any other lubricant in this opening as it is a waste of time and will only make a mess should you try to replace a motor bearing. The bearings used in these motors are sealed so any lubricant you add will not get into the roller balls and will just collect in the cavity behind the bearing.


  • mbec118907 Sep 17, 2010

    I would like to thank both john224 and rnpfloze for their expert input to my solution unfortunely my motor is frozen to the point of no return and must be replace. But the advise was right on time and very accurate. Thanks!



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