Question about Polaris 380: Polaris Booster Pump

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The polaris booster pump motor does not start. I hear it humming. I took the end cap off and turned the shaft without a problem. I took off the capacitor and tested it and it works. What should I check next?

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I my name is Juan and I was a pool repair tech in california and if your capacitor is good and your motor turns freedly with your hand then is time to replace your motor for a new one if you planing to do this make sure you replace the water seal is a good time to do it

Posted on Jun 16, 2009

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Posted on Jan 02, 2017

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1 Answer

Are there any other booster pumps that I can use to run my pool cleaner? I had a Polaris bp4-60 for 7 years, it finally failed. Replaced it with same model. Ran for few mins then shuts off then restarts....


I think Polaris should refund the purchase price on these pumps. I changed the breaker, the whip, and upgraded the outlet (using 110). The dealer exchanged it for me, but would not give me a refund, and I had the same issue with the second motor. I used a Hayward 6060 pump as a replacement. Everything works fine.

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turn off try spinning the back shaft of motor then try if still doesn't work need new pump or motor

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I have a Polaris LR51044 pump that is not working. When I turn it on it "hums" but won't pump water. I live in Baton Rouge, La. and we have had freezing or below freezing weather for the last 2 days. The...


Usually when a polaris booster pump hums it means 1 of 2 things; either the starting capacitor needs to be replaced (its located under the black hump on top of the motor) or the pump is bad. Most likely the starting capacitor needs to be replaces. This is where you should start since the capcitor is only $20-$30. Get a new capacitor from a local pool store, shut the power off to the motor, remove two screws on each side of black hump on top of motor, remove two wires from starting capacitor and install wires on new capacitor, replace cover and turn the pump on. If that doesn't work you will need to replace the motor.

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How do I take a booster pump apart to replace the motor?


Pull the back cap off the motor and hold the shaft as you spin off the impeller. The rest is straight forward enough.

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Lock the end of the shaft opposite the pump and then turn of the impeller counter clockwise looking at the pump. The remainder is simple nuts and bolts.

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My polaris booster pump will not come on. when i turn it on the motor makes a humming noise but wont start


Does it have a century motor? If so, remove the shaft cover plate at the rear and try rotating the shaft with a very thick slotted screwdriver or substitute until it turns fairly easily. Often some mild oxide develops around components that just needs to be disturbed.

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