Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 3 of 3

Thread: Magnum Force Pump Losing Pressure

  1. Back To Top    #1
    lola23048's Avatar
    Join Date
    Jul 2014
    clermont, fl

    Smile Magnum Force Pump Losing Pressure

    Hi all — I am new to taking care of and owning a pool so I'm learning as I go. Recently, I was able to pry the top off the Jacuzzi Magnum Force 1HP pump to clean out the filter basket inside. I dumped a bucket of pool water in, screwed the top on and started the pool. It works and runs fine when I do that, but when the pool shuts off for the day and restarts the next morning, it seems the pressure doesn't build right when it restarts. I can really tell because the jets inside the pool don't put out a constant flow, they sputter and spit. But if I turn it off, dump water into the pump and restart it, it works just fine. Anybody know why it's doing this?

    Just got the house and pool not too long ago, and the people who lived here before us weren't taking care of the pool or the equipment so I know it hadn't been opened and cleaned in who knows how long.
    Lake County, FL
    15,000 In-Ground built around 2001, Gunite, Cartridge, 1HP Jacuzzi Magnum Force pump, spa and water features, Kreepy Krauly Classic.

  2. Back To Top    #2
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: Magnum Force Pump Losing Pressure

    I would suspect the O-ring gasket for the pump strainer lid. That's what was most recently disturbed, and the problem started right after. It could just be old and brittle and no longer resilient enough to seal, or it could have cracks, or there could be bits of grit or sand on the mating surfaces, or it just needs some lubricant. Time to pry the top off and have a look.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

  3. Back To Top    #3

    In the Industry
    patrick3229's Avatar
    Join Date
    Feb 2012

    Re: Magnum Force Pump Losing Pressure

    If you want to completely tune up your pump that might be an option as well, there is a tune up kit called a GOKIT14 ($30-$40) which would include the lid o-ring plus all of the other o-rings and gaskets for the pump along with a shaft seal and lubricant for the O-rings. It may be a little overkill for your situation but for an older pump it can be good preventative maintenance.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts