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Thread: Slow motor on start up

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    Join Date
    Jul 2010
    Location
    Central, New Jersey
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    31

    Slow motor on start up

    So, I know if you just have a hum and motor doesn't spin up, it is most likely the start capacitor. That is, if your motor isn't seized

    My issue is a little different, I have the motor off the pump and on my bench to work on. My motor starts, it just starts slow. Like takes 1.5 -2 seconds to spool up. Kind of like, when you plug it in, you get whuu, whuu, WHUU, WHUU, WHUU, WEEEEEEEEEE(full speed). Could that be the start cap too?

    I took the cap off, and my digital voltmeter reads capacitance. It read the correct MFD for the capacitor, does that mean its still good?

    Thanks
    Craig
    Pool: 20 X 40 Rec - 28,500 gallons;
    Type: IG with Vinyl Liner
    Filter: Hayward 46SqFt DE Filter
    Pump Size: Hayward Super-Pump 1 hp

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    Mod Squad Bama Rambler's Avatar
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    Jun 2009
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    Re: Slow motor on start up

    It could be the cap getting weak or it could be the centrifugal switch contacts not making good contact or it could be bad bearing(s) dragging it down. How easy is the shaft to turn by hand?
    You can clean the cent sw contact with a fine emory board or very fine sand paper.
    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
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    Join Date
    Jul 2010
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    Central, New Jersey
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    Re: Slow motor on start up

    Thanks Bama,

    The shaft spins pretty easy, I can give the impeller a good spin, but it stops within one second. But the shaft seems pretty free.

    I'm going to try and clean the cent sw contacts as you suggest and give all the moving parts in there some lube. Maybe even see if I can get to the bearings a little.

    I will see if any of that helps, but for like 8 bucks I can get a new capacitor too and just give it a try, Better than the price of a new motor
    Pool: 20 X 40 Rec - 28,500 gallons;
    Type: IG with Vinyl Liner
    Filter: Hayward 46SqFt DE Filter
    Pump Size: Hayward Super-Pump 1 hp

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    Smykowski's Avatar
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    Sep 2011
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    Gurnee, IL (North Suburban Chi-town)
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    3,065

    Re: Slow motor on start up

    Based on your description of the noise, I'd guess bearings. They're most likely sealed, so they can't be lubed, only replaced, but you can get the pair for less than $20. If you don't mind throwing a little money at it, it probably wouldn't hurt to replace the capacitor, too. Post back with what you end up doing.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
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