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Thread: Booster pump diagnostic question

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    Join Date
    Aug 2010
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    Houston, TX
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    Booster pump diagnostic question

    Hi all. I have a Pentair 3/4 hp booster pump (Model LAO1N). Came home from work tonight and noticed that my cleaner wasn't moving around, so the first thing I checked was the booster pump. The motor was running and the shaft was turning, but I could not hear the impeller rotating and there was water leaking from that side of the pump.

    This is my first pool and also my first experience with pool related equipment failure, so before I rush out and start ordering repair parts I want to get an idea of what I need for sure. I'm guessing that someone here can tell me what the problem is?

    Do I repair, or should I just replace the whole pump? I see one on ebay for $220. But an impeller is only $32 if that's all I need. Any ideas/suggestions?

    BTW, love this site.
    IG, Peb Tec, 15,000 gal saltwater pool with spillover spa. Pentair Clean and Clear Plus cartridge filter (flow rate 150 gpm). Pentair WhisperFlo 2hp pump + 3/4 hp booster pump. Intelichlor IC40 cell. UltraPure Turbo Shock ozone generator. Pentair 320 in-line feeder for winter chlorination. StaRite Max-E-Therm nat gas heater. Pentair EasyTouch controls

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    Richard320's Avatar
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    Jan 2010
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    San Dimas, CA (LA County)
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    Re: Booster pump diagnostic question

    If water's leaking out, air is leaking in, which will make you lose prime. Probably just needs a reseal. Looks relatively easy, assuming you can get the pump part separated from the plumbing. http://www.poolcenter.com/parts_pumps_p ... _la01n.htm
    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!

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    Re: Booster pump diagnostic question

    Thanks for the quick response Richard. So you think it's just a seal? Part# 3 in the link you posted?

    The motor is not bolted down to the pad so I think I can separate the motor from the volute fairly easily. The I'm guessing that I just need to remove and replace the seal? Are there any special tools needed or any particurlar precautions I need to take?
    IG, Peb Tec, 15,000 gal saltwater pool with spillover spa. Pentair Clean and Clear Plus cartridge filter (flow rate 150 gpm). Pentair WhisperFlo 2hp pump + 3/4 hp booster pump. Intelichlor IC40 cell. UltraPure Turbo Shock ozone generator. Pentair 320 in-line feeder for winter chlorination. StaRite Max-E-Therm nat gas heater. Pentair EasyTouch controls

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    Richard320's Avatar
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    Re: Booster pump diagnostic question

    Quote Originally Posted by tcrb
    Thanks for the quick response Richard. So you think it's just a seal? Part# 3 in the link you posted?

    The motor is not bolted down to the pad so I think I can separate the motor from the volute fairly easily. The I'm guessing that I just need to remove and replace the seal? Are there any special tools needed or any particurlar precautions I need to take?
    I dunno. Never had one of them apart. And when I had to fix my main pump, I just hauled it to the pool store and let them do it all. Had it back in 2 hours, for $30. 'course that was the slow season.... But since I was going to have to make a trip there anyway to get the seals, it just seemed simplest. I have thousands of dollars worth of mechanics tools, a die grinder, gear pullers, even access to a hydraulic press at work, but I don't mind paying for someone else's experience.
    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!

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