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Thread: Exactly how easy should motor shaft/impeller spin?

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    CajunGuy's Avatar
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    Exactly how easy should motor shaft/impeller spin?

    Just finished rebuilding my Whisperflo pump with a new seal plate (grommet housings were cracked bad causing shift, impeller was rubbing against diffuser face), new shaft seal, and new gaskets/o-rings.

    Got everything put back together and just screwed the impeller on, but it seems like it turns/spins with the same amount of force as it did prior to me rebuilding the pump. My question is...are you suppose to be able to spin it and it spins freely in multiple circles on its own for a while? Or is it suppose to be able to just manually turn by hand? I can turn it by hand with no problem, but if I tried spinning it like a wheel/top, it will not spin freely for any period of time.
    15k Gallon In Ground Saltwater Gunite Pool and Spa w/ Overflow
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    CJadamec's Avatar
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    Re: Exactly how easy should motor shaft/impeller spin?

    It shouldn't spin like a top but you should be able to rotate it 360 degrees smoothly with out it having any binding or sticky spots. It's hard to describe the amount of force it should take to spin it but it shouldn't be much. There will be drag on the shaft from the seal, motor bearings, and mass of the motor rotor which probably has some residual magnetism.
    Chuck-
    15x30 AG, Pentair Superflo VS, 19" sand filter, TF-100 test kit
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    CajunGuy's Avatar
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    Re: Exactly how easy should motor shaft/impeller spin?

    Quote Originally Posted by CJadamec View Post
    It shouldn't spin like a top but you should be able to rotate it 360 degrees smoothly with out it having any binding or sticky spots. It's hard to describe the amount of force it should take to spin it but it shouldn't be much. There will be drag on the shaft from the seal, motor bearings, and mass of the motor rotor which probably has some residual magnetism.
    OK it sounds like I'm alright then. It was previously rubbing against the diffuser face and getting stuck, but now (after rebuild) I can turn it all the way around in a circle without any spots where it gets hung up or hard to turn. I noticed once I put the impeller on there was a little more tension, I'm assuming this is normal from the seals pushing together which apply a little more pressure to turn the shaft?
    15k Gallon In Ground Saltwater Gunite Pool and Spa w/ Overflow
    Dolphin S200 Pool Cleaner
    Main Filter Pump - 1.5HP Pentair Whisperflo connected to Triton II Sand Filter
    Spa Pump - 2HP Pentair Whisperflo w/ 2HP Polaris Spa Air Blower
    Resilience PSC3 SWCG

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    CajunGuy's Avatar
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    Re: Exactly how easy should motor shaft/impeller spin?

    So the impeller/shaft should get a little more tension to turn it once the impeller is installed because of the pressure of the spring loaded side of the seal now pressing against the impeller side of the seal right? I can still rotate the impeller/shaft in a full circle with no problem, just got slightly more tension in it once I put the impeller on.
    15k Gallon In Ground Saltwater Gunite Pool and Spa w/ Overflow
    Dolphin S200 Pool Cleaner
    Main Filter Pump - 1.5HP Pentair Whisperflo connected to Triton II Sand Filter
    Spa Pump - 2HP Pentair Whisperflo w/ 2HP Polaris Spa Air Blower
    Resilience PSC3 SWCG

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    CJadamec's Avatar
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    Re: Exactly how easy should motor shaft/impeller spin?

    The seal is spring loaded so yes when you put the impeller on the seal tightens up.
    Chuck-
    15x30 AG, Pentair Superflo VS, 19" sand filter, TF-100 test kit
    Aqua Comfort ACT750 heat pump / 6x20 ground mount solar panel / DIY automation

    Photos of 2016 Build, Inside Your Breaker Panel, Free Copy of 2017 NEC code
    TFP is AD Free and is funded solely by member support click here to help

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