Pump making loud noise

randdusing

Bronze Supporter
Feb 7, 2021
20
Conroe TX
My pump has been making a fairly loud noise since I moved into my house about a year ago. I thought the sound was normal until a friend said "that isn't normal, you should barely hear a Whisperflo", which makes a lot of sense based on the name. Is anyone able to diagnose what's wrong, and is it a DIY fix? Also, whenever the pump starts up, it almost sounds like some little pebbles are sloshing around and then normalizes to the sound in the linked video.

 

ferretbone

In The Industry
May 24, 2016
161
tx
Impeller grinding against the defuser. Or The motor is going out. Did it get louder over a period of time? Or start suddenly?

Just for fun turn it off. open the lid remove the basket, is there a reandom screw down there just sitting there? Or can you remember seeing one there at some point?

Go ahead and spin the metel shalf at the back of the motor behind a litlle almond colored plastic cover about the size of a golf ball. Use a wrench to spin that shaft and listen/ feel the front of the pump for grinding plastic.

If no real luck after that you will have to unbolt the motor from the pump. 6 bolts. then pull the motor out.
 
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randdusing

Bronze Supporter
Feb 7, 2021
20
Conroe TX
Impeller grinding against the defuser. Or The motor is going out. Did it get louder over a period of time? Or start suddenly?

Just for fun turn it off. open the lid remove the basket, is there a reandom screw down there just sitting there? Or can you remember seeing one there at some point?

Go ahead and spin the metel shalf at the back of the motor behind a litlle almond colored plastic cover about the size of a golf ball. Use a wrench to spin that shaft and listen/ feel the front of the pump for grinding plastic.

If no real luck after that you will have to unbolt the motor from the pump. 6 bolts. then pull the motor out.
It's been loud for a while. The "sloshing" pebble/screw sound is newer. And I haven't noticed anything while cleaning the basket.

I'll try spinning it tomorrow, but it seems like I should just learn how to pull motor out over the weekend.
 

JamesW

TFP Expert
Mar 2, 2011
28,257
Can you show a picture of the sticker on the front of the pump with the barcode and the date?

Check the voltage and make sure that the voltage is correct for the pump setting.
 

ferretbone

In The Industry
May 24, 2016
161
tx
It's been loud for a while. The "sloshing" pebble/screw sound is newer. And I haven't noticed anything while cleaning the basket.

I'll try spinning it tomorrow, but it seems like I should just learn how to pull motor out over the weekend.
"Also, check the centrifugal switch in the back of the motor for a broken spring." He doesn't have one of those on a factory whisperflo motor.
I'm betting 1.5 hp uprated motor.


Just pull those 6 bolts and remove the motor. It's real easy. After that there will be two tiny alen screws holding the defuser on. Remove that under the defuser is your impellar. Something is rubbing with those two parts or it's likely your motor.
 
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ccbill

Well-known member
Jul 23, 2021
140
Atascadero, Ca
Pool Size
23000
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Plaster
Chlorine
Liquid Chlorine
I'll try spinning it tomorrow, but it seems like I should just learn how to pull motor out over the weekend.

You can download whiperflo manuals at the Pentair website.The manual has nice exploded parts diagrams so you can see how it all goes together and some basic instructions for taking it apart.

Here's a Pentair video showing how to get everything apart. Seal replacement WhisperFlo® & IntelliFlo® pump
 

mas985

TFP Expert
LifeTime Supporter
May 3, 2007
14,735
Pleasanton, CA
Pool Size
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Plaster
Chlorine
Salt Water Generator
"Also, check the centrifugal switch in the back of the motor for a broken spring." He doesn't have one of those on a factory whisperflo motor.
I'm betting 1.5 hp uprated motor.
I believe the two speed Whisperflo does have a centrifugal switch. All two speeds do. I was just covering it in case it was a two speed.
 

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randdusing

Bronze Supporter
Feb 7, 2021
20
Conroe TX
Apologies if I don't answer all the questions, but I did some further diagnosis today. The pump seems fine except for some possible wear on the diffuser. There was no debris stuck in the impeller, and the shaft turns freely. But the motor appears to be in really bad shape. There's heavy corrosion around the 4 bolts. One of them couldn't even be tightened back on. Surprisingly it started back up when put back together, albeit even louder than normal and with a "nastier" start up sound. Unfortunately turning it on again later, the motor seized up. Looks I'll be replacing my Whisperflo with an Intelliflo earlier than expected.

I believe this motor is 4-5 years old. Is that normal? Based on reading some other threads, I'm concerned with whether the equipment is bonded correctly.
 

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JamesW

TFP Expert
Mar 2, 2011
28,257
Check the voltage and make sure that the voltage is correct for the pump setting.

Can you show a picture of the sticker on the front of the pump with the barcode and the date?

1632105314199.png
 

randdusing

Bronze Supporter
Feb 7, 2021
20
Conroe TX
I've attached the pump barcode. By check the voltage, do you meant use a voltmeter / multimeter while it's running?

Good news, I tried turning it on this morning, it briefly made the nasty "lock up" sound, but then started noisily pumping.
 

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JamesW

TFP Expert
Mar 2, 2011
28,257
It's possible that the motor pulled back enough to cause the impeller to rub on the seal plate due to the loose bolt.

Check the seal plate and the impeller to see if they show signs of rubbing.
 

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