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Thread: Noisy Pentair Whisperflo. Even after I changed the bearings.

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    prosper's Avatar
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    Noisy Pentair Whisperflo. Even after I changed the bearings.

    Near the end of last year pool season (3rd season of pool) my Pentair Whisperflo started to get noisy.

    I researched and it seemed like the resolution would be to replace the bearings.

    Welp, I just replaced the bearings today and the noise remains.

    I took a video hoping someone else may have resolved a pump sounding like this.

    Let me know if you have any ideas. Thanks!

    Here's the video/audio after the bearings and seals were replaced today. Pentair Whisperflo still noisy after bearings replaced. - YouTube
    35k gallon 20x45 inground concrete with vinyl liner - Stamped Concrete deck
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    Re: Noisy Pentair Whisperflo. Even after I changed the bearings.

    Sounds like the impeller is hitting something but I'm not a pump expert. Got my pump replaced last year with one of those and it is really quiet,
    Inground 22k gallon gunite 15x31 main pool, 15x7 wading pool/sunning deck, hot tub/with overflow (9' octagon with limestone top) & slide NSWG, Aqua Blue Pebble Sheen
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    Re: Noisy Pentair Whisperflo. Even after I changed the bearings.

    Time for a new motor.
    25K aggregate IG, Intellipro, FNS48, Polaris 360, PG2000 fiber optic light source

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    Re: Noisy Pentair Whisperflo. Even after I changed the bearings.

    I am not a pump guy, but that sounds more like a secondary vibration that is being transmitted from the frame.

    I would try a rubber 1/8" Mat under the pump so it is not metal to concrete. Secondly you could bolt the pump down onto the rubber mat and that should eliminate the noise if it is in fact a frame vibration.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    prosper's Avatar
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    Re: Noisy Pentair Whisperflo. Even after I changed the bearings.

    I tried isolating the pump on a rubber mat, noise remained. Bummer.

    Pathetic life span on this particular pump.
    It's not even out in the elements and I took good care of it.

    I HATE buying things I already bought.
    Not even 3 short seasons. Lame.
    35k gallon 20x45 inground concrete with vinyl liner - Stamped Concrete deck
    Pentair WhisperFlo 2HP - Pentair FNS Plus 60 DE
    Heat Siphon heat pump - Compupool cpx48
    Blue Diamond RC robot vacuum - TF100 testkit

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    Re: Noisy Pentair Whisperflo. Even after I changed the bearings.

    Sounds like it needs a rubber mat but you tried that already.

    Did you inspect the impeller for any damage?

    Did you try spinning it with your hand and hear anything or feel any looseness?

    You shouldn't be hearing that if the bearings are new.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
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    Re: Noisy Pentair Whisperflo. Even after I changed the bearings.

    Gotta love YouTube..nice video btw! The noise is kinda rhythmic & droning and doesn't sound like a bearing problem. I'd try replacing the capacitor first then go from there, quick & easy.

    E

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    Re: Noisy Pentair Whisperflo. Even after I changed the bearings.

    The capacitor just starts the motor, shouldn't be contributing to the noise, UNLESS ITS LOOSE, but he could TEST the capacitor
    and if it's out of spec should replace anyway.

    I forgot to ask but all the bolts from the wet end to the motor are properly tightened yes?

    Just trying to rule everything out.

    Might be a good idea to take the motor off and confirm everything is assembled correctly too.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
    Dolphin E10 Cleaning Robot.

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    Re: Noisy Pentair Whisperflo. Even after I changed the bearings.

    Quote Originally Posted by borjis View Post
    The capacitor just starts the motor, shouldn't be contributing to the noise, UNLESS ITS LOOSE, but he could TEST the capacitor
    and if it's out of spec should replace anywa.

    How To Select the Right Capacitor For Your Pool Pump Motor - INYOPools.com

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    Re: Noisy Pentair Whisperflo. Even after I changed the bearings.

    That sounds like an imbalance in the motor and if that motor has a centrifugal switch, that is where I would look first. The switch has a weight (governor) that moves up and down on the shaft depending on the motor RPM. If the springs are worn or broken, the weight can oscillate back and forth causing noise.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: Noisy Pentair Whisperflo. Even after I changed the bearings.

    Talked with a couple of support folks at Pentair. Wow, do they hate their jobs. One Rep said it sounds completely normal.
    The other Rep said 2-3 years lifespan is not completely out of the ordinary. Then reminded me the warranty is 1 year. Hahah.
    I didn't want a free replacement. Just wanted to get their thoughts.

    So, I went to Century direct. Sent a note to Tech Support from their website with a link to the video.
    Within an hour a really smart sounding guy responded.

    He said there could be an issue with the end frame bell housing with wear. Which could allow room for movement/vibration.
    So, I went out and took apart the back of the pump and the housing that the bearing goes into in the end frame (bell housing cap) definitely is worn and not right.

    Now I just need to find out how much the part number he provided is. He said I could get it from Grainger or any electric motor repair shop.
    I think my Google searches are the first time I got skunked in finding where to source something.

    Anyhow, I'll chime back in if/when I find the replacement bellhousing and report if it fixed the noise.

    Here is the End Frame Century part# 2017716-003
    Will probably replace the wavy washer (bearing preload spring) while I'm at it. That is part # PSWW1543-020 (COMPRESSED LOAD IN POUNDS: 25-37---for bearing 203)
    35k gallon 20x45 inground concrete with vinyl liner - Stamped Concrete deck
    Pentair WhisperFlo 2HP - Pentair FNS Plus 60 DE
    Heat Siphon heat pump - Compupool cpx48
    Blue Diamond RC robot vacuum - TF100 testkit

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    Re: Noisy Pentair Whisperflo. Even after I changed the bearings.

    Did you ever figure out what that noise was?

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