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Thread: Motor replacement on almost new pump

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    Motor replacement on almost new pump

    I am replacing on motor on a pump with maybe 100 hours on it. Do I need to change any seals or anything or can I just change motors. I am doing this for lower HP.

    Daren
    DRB
    16x32 20K IG vinyl, Hayward Pro Grid DE4820 w/ 2-speed 1.5HP Hayward TriStar pump with a .75HP impeller installed, AutoPilot Digg-220

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    Mod Squad jblizzle's Avatar
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    Re: Motor replacement on almost new pump

    You should usually replace the shaft seal whenever you install a motor.

    What exactly are you changing? You can not just put a smaller motor on the pump, you also need to put a smaller impeller on or you will just burn up the motor.
    Jason, TFP Moderator
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    Re: Motor replacement on almost new pump

    Thanks for the info. If that is the case then can I just order a smaller impeller and put it in my pump then?
    DRB
    16x32 20K IG vinyl, Hayward Pro Grid DE4820 w/ 2-speed 1.5HP Hayward TriStar pump with a .75HP impeller installed, AutoPilot Digg-220

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    Mod Squad jblizzle's Avatar
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    Re: Motor replacement on almost new pump

    Actually, yes. If you put a smaller impeller on your existing motor ... that is almost the same power reduction as you would get replacing the impeller and the motor with smaller sizes.
    Jason, TFP Moderator
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    Re: Motor replacement on almost new pump

    Another question, would changing the impeller from a 1.5 to .75 also reduce the amp draw of the motor

    Thanks
    Daren
    DRB
    16x32 20K IG vinyl, Hayward Pro Grid DE4820 w/ 2-speed 1.5HP Hayward TriStar pump with a .75HP impeller installed, AutoPilot Digg-220

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    Mod Squad jblizzle's Avatar
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    Re: Motor replacement on almost new pump

    Yes, thus the lower power consumption.
    Jason, TFP Moderator
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    Re: Motor replacement on almost new pump

    Thanks,it's a good thing I check with you experts before I do something stupid. Because I wasn't sure how small I could go I was going to replace the 1.5hp with a 1hp and if that wasn't enough I was then going to go down to a .75 impeller.

    When replacing the impeller on a almost brand new pump is there anything else I need to replace? (Like seals, o-rings, ect). Also is it a ferry simple task?

    Thanks
    Daren
    DRB
    16x32 20K IG vinyl, Hayward Pro Grid DE4820 w/ 2-speed 1.5HP Hayward TriStar pump with a .75HP impeller installed, AutoPilot Digg-220

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    Mod Squad jblizzle's Avatar
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    Re: Motor replacement on almost new pump

    Actually, since you will not be removing the motor now from the housing, you should not need any new seals.

    You just have to split the pump (4-8 bolts) and will see the impeller, then you need to take the rear cover off the back of the motor so you can grab the shaft to keep it from spinning and then unscrew the impeller and screw the new one back on.
    Jason, TFP Moderator
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    Re: Motor replacement on almost new pump

    Great thanks. Now the very last question. I have 1.5 Hp that am putting the .75 impeller on. Now let's say in 10 years the motor needs replacing, can I put a 1hp motor on?

    .75hp is not available in a 2 speed

    Daren
    DRB
    16x32 20K IG vinyl, Hayward Pro Grid DE4820 w/ 2-speed 1.5HP Hayward TriStar pump with a .75HP impeller installed, AutoPilot Digg-220

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    Mod Squad jblizzle's Avatar
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    Re: Motor replacement on almost new pump

    Yes because the 1HP motor is still > .75 HP impeller.
    You could put a 1 HP or 0.75 HP 2speed on it as well.
    Jason, TFP Moderator
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    Re: Motor replacement on almost new pump

    I have finished exchanging the 1.5 hp impeller with a .75 one. I can 't test to spring but expect all will be well. Thanks for every bodies help. The reason for this change, besides that the flow was too great, was to save as much energy as possible. How does running a 1.5hp equal running a .75hp?

    My guess is that less resistance = less energy. Would that be correct? Otherwise I would probably look for a smaller motor. Again thanks for all of the valuable info.

    Daren
    DRB
    16x32 20K IG vinyl, Hayward Pro Grid DE4820 w/ 2-speed 1.5HP Hayward TriStar pump with a .75HP impeller installed, AutoPilot Digg-220

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    mas985's Avatar
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    Re: Motor replacement on almost new pump

    Your sig says a 1 HP Superpump. Was the original pump a 1 HP or a 1.5 HP?

    Yes power consumption goes down and from a 1.5 to a .75 HP Superpump, power is reduced by about 40% and flow rate about 25%.
    Mark
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    Re: Motor replacement on almost new pump

    Need to update my sig, that is my old equipment. End of season did a complete rebuilt of pool. I now have a 2-speed 1.5hp tristar with the .75 impeller.

    Daren
    DRB
    16x32 20K IG vinyl, Hayward Pro Grid DE4820 w/ 2-speed 1.5HP Hayward TriStar pump with a .75HP impeller installed, AutoPilot Digg-220

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