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Thread: replace motor with smaller HP?

  1. Back To Top    #1

    Join Date
    Jul 2015
    Location
    El Cajon, CA
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    3

    replace motor with smaller HP?

    I have a failing Hayward Hydromax SPLE40016 pump motor (1.5HP). Some time ago, a pool "professional" suggested that I replace it with a .75HP pump. We have no water features or solar. What things do I need to figure out in order to replace this motor?
    All input greatly welcome.
    36k, IG, Fibreglass
    Hayward Microclear DE-4800
    Hayward Hydramax II 1.5hp single speed
    Taylor k-2006 with novice skilled owner

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    Mod Squad Bama Rambler's Avatar
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    Jun 2009
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    SouthWest Alabama
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    Re: replace motor with smaller HP?

    With no water features or solar, a 3/4hp full rated pump is probably plenty big enough.

    If you're just considering replacing the motor and keeping the wet end you'll also need to replace the impeller and shaft seal as well as the diffuser.

    - - - Updated - - -

    Also being that you're in Cali, I don't think you can replace it with a single speed model. You need at least a 2-speed.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  3. Back To Top    #3

    Join Date
    Jul 2015
    Location
    El Cajon, CA
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    Re: replace motor with smaller HP?

    Understood and thanks. Also, love the comment about OCLT and SLAMming in your footer. One of the other areas I am just learning about...

    Quote Originally Posted by Bama Rambler View Post
    With no water features or solar, a 3/4hp full rated pump is probably plenty big enough.

    If you're just considering replacing the motor and keeping the wet end you'll also need to replace the impeller and shaft seal as well as the diffuser.

    - - - Updated - - -

    Also being that you're in Cali, I don't think you can replace it with a single speed model. You need at least a 2-speed.
    36k, IG, Fibreglass
    Hayward Microclear DE-4800
    Hayward Hydramax II 1.5hp single speed
    Taylor k-2006 with novice skilled owner

  4. Back To Top    #4

    Join Date
    May 2009
    Location
    Youngsville NC
    Posts
    395

    Re: replace motor with smaller HP?

    I believe the max HP for a single speed in California is 1 HP.

    OP - if you are looking to downsize your motor, then you also need to downsize the impeller in the wet end as well, or you will burnout the motor.
    16x32 IG 19,000 gallons, Pentair 1.5 hp Energy Efficient Superflo pump (348024),vinyl liner, Chlorine dispenser, Hayward S-244T sand filter

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