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Pentair pool pump replacement

driftpin

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Dec 22, 2016
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11,319
Location
Miami-Dade/Broward Co. Florida
I had a Pentair 240 volt 3 hp multi-speed pool pump surrender after seven years of service. I was hoping for more, but that's what we got. Model 11011 Intelliflow w/anti-suction sensing.

I went to the local chain pool supply store, their price without the anti-suction sensing device built-in (model 11018) was $1445. That's out-the-door, no installation. The original one was more $, as it had the anti-suction protection, and the pump design, w/multiple speeds, was brand-new on the market. Energy Star-compliant, it runs at different speeds for economy.

Amazon is your friend. Amazon Prime, free shipping, and $925 for the model 11018 pump. I try to buy locally, but a difference of $520, well, hey, we're retired.

Awhile ago we had a pool robot cleaner (Hayward Navigator) line installed (see below for why), and also a pump/filter relocation due to a big whole-home remodel. We added a sitting room on the last bedroom on that side of the house, and also an en-suite luxury bathroom. Another addition was blowing-out the front of the house where the 2 car garage was, to the front setback, to reconfigure the garage, to provide a laundry/pantry, and a new full bath. The idea was to enter the house from the garage, turn right into the bathroom, get cleaned-up there, cross the hallway to the laundry/pantry, throw the clothes into the machine, and emerge clean into the kitchen ("What's for dinner, honey?")

The pool robot cleaner wasn't working very well when it was just plugged-into one of the two pool skimmers. We got a pool service guy to install a new suction line through the sidewall of the pool and to relocate the pump and filter onto a new slab the GC poured beside the pool deck just for it.

The GC did all new electrical service for the pump. He also did a GFCI 120 volt duplex outlet there, which is the end of the new addition, at the en-suite bathroom exterior wall. The new AC is there too, on its own slab.

Back to the defunct pool pump. Three days from order to delivery. I stayed home to wait for it, so no-one could follow the truck and relieve us of our pump. I brought it inside, opened it, and admired the new pump/motor, considerable pride of ownership resulted.

I installed the pump, and when I went to run it, the pump wouldn’t pull a prime. I fussed with it the rest of the day, but it didn’t want to pull the prime, it would shut-off after trying for awhile.

My wife reminded me to “read the directions,” and after reading the priming options, I decided to try setting the “priming sensitivity” from a value on the LCD screen from the factory programmed setting of “1%” to “91%” The lower the # the more-sensitive to sensing if the pump has attained a prime. That did it, and now it pulls a prime fine. I haven’t set-up the time cycles for different speeds, but I probably will tomorrow.

I got a new tool from, ​horrors! ​Harbor Freight, a large pair of water pump pliers, w/a curved jaw, for clamping round objects at > 2 points of jaw contact. I think they were $16 not-including the 20% discount, that would be a price of $12.80 before tax. That helped me to work with the unions for the piping to/from the pump. I was pleasantly surprised at the quality of the pliers. They were finished smoothly on their sides, the serrations on the jaws looked rugged, and they were comfortable to grip, w/cushioned grips. The ratchet jaws didn’t slip under pressure.

I figure I would have had to pay probably $300 for a pump installation, including fittings and set-up/programming. Since I saved $520 on the pump, and $300 for the install, that’s $820 staying in ​my ​pocket.

The pool equipment business where I bought the prior Pentair pump, and to-whom I brought the non-functioning pump for examination said the seal from the front of the motor went bad, allowing water into the motor, causing it to fail. I hadn’t seen the pump leaking from the front of the motor, but when I removed the pump housing, there were signs that it had.

Another thing I encountered when I disassembled the old pump/motor was that the SS hex head screws bolting the motor flange to the pump housing had the white oxidation around the machine screws where they passed-through the motor flange, to thread into the pump brass-threaded inserts in the plastic body of the pump. When I tried to remove the screws, two came-out easily, one needed a bit of persuasion, and one had the hex head snap-off before it moved. The threaded portion of the SS hex bolt was frozen in the aluminum flange of the motor. I had to destroy part of the motor aluminum flange around the bolt to be able to separate the pump and the motor.

To prevent such corrosion on the new motor/pump, I need to keep a closer eye on the front of the motor seal. I think I’ll disassemble the pump entirely from the motor, and use some Permatex anti-seize on the bolts holding the pump and motor together, including anti-seize on the bolt threads where they pass-through the aluminum motor mount flange holes, which are not threaded, but which built up enough oxidation to 'freeze' the machine screws in those holes. In about four years, I’ll replace that front of the motor seal as preventative maintenance, or sooner if I see any leakage. Hopefully, that will allow the pump/motor to reach double-digits for the duration of service.

This was also the first time I got to use my new (used) Porter Cable portable bandsaw. I got it from a friend who didn't need it, and found 20 14 tpi bimetal quality baandsaw blades on a closeout website on Amazon Prime, $4 apiece. It worked like it was cutting through shaving cream, cutting the 2" pvc pipe.
 

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Jeepster04

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Jun 25, 2013
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3,103
Be careful with what type of anti-seize you use. You can setup some galvanic corrosion and you'll be just as bad off.

I like using the super lube from harbor freight or sil glyde on things of that nature...
 

yeldogt

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Joined
Jan 2, 2012
Messages
18,184
When I was a kid the motor bearings would go ... it was common to get them replaced at a local shop. Same with the pump seals. General maintenance -- part of owning a pool. Eventually the whole thing rusted away and was replaced.

I can't remember exactly when the Hayward super pump came along .. its got to be 30+ years. But the plastic cases changed the whole game ... those things ran forever. Guess it was a combination of the seal not leaking and maybe better motor design -- the motors could be switched out in no time when they did need anything.

Today -- the motors seem to be throw away .. and they just don't last. My pool cleaner motor is only going on three years and its already rusty. I replace one of my super pump motors a few years ago -- now century from China. I always wipe a light coating of "jacks" or a product like when I do any service -- any threads or internal parts. Spray wax on the equipment when I clean it off..

The Pentair pumps are very nice -- better built IMO vs the Superpumps .. they do require correct piping -- do you have a section of straight pipe in front of the unit ... I think they want 10" -- 5x the required 2" pipe.
 

niget2002

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Oct 2, 2012
Messages
11,265
Location
Josephine, TX
My pool is going on 10 years old.

3 years ago the motor died on the pump. I replaced just the motor for $180. This year, the housing on the pump developed a crack at the output shaft. Replaced just the housing for $200 (had a pool guy do it this time).

Could you not have just replaced the motor?
 
OP
D

driftpin

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Joined
Dec 22, 2016
Messages
11,319
Location
Miami-Dade/Broward Co. Florida
Be careful with what type of anti-seize you use. You can setup some galvanic corrosion and you'll be just as bad off.

Thanks for the tip, I need to see what the Permatex anti-seize I have would do in this role. I think you could probably use some general purpose white lithium grease. I might try something else as suggested below.

I like using the super lube from harbor freight or sil glyde on things of that nature...

Thanks for the suggestion of corrosion inhibitors.I looked up the Syl Glide. The local auto stores have it in a 4 oz tube for $7.49.

When I was a kid the motor bearings would go ... it was common to get them replaced at a local shop. Same with the pump seals. General maintenance -- part of owning a pool. Eventually the whole thing rusted away and was replaced.

I can't remember exactly when the Hayward super pump came along .. its got to be 30+ years. But the plastic cases changed the whole game ... those things ran forever. Guess it was a combination of the seal not leaking and maybe better motor design -- the motors could be switched out in no time when they did need anything.

Today -- the motors seem to be throw away .. and they just don't last. My pool cleaner motor is only going on three years and its already rusty. I replace one of my super pump motors a few years ago -- now century from China. I always wipe a light coating of "jacks" or a product like when I do any service -- any threads or internal parts. Spray wax on the equipment when I clean it off..

The Pentair pumps are very nice -- better built IMO vs the Superpumps .. they do require correct piping -- do you have a section of straight pipe in front of the unit ... I think they want 10" -- 5x the required 2" pipe.

Yes, I did read the installation directions about the 'no 90 degree fittings within five-times the diameter of the inlet/outlet piping, from the pump.'

The pumps being plastic instead of bronze or brass was a novel idea, and they worked well-enough to become the industry standard. As for the motors, Hayward and Sta-Rite seem to have plenty of fans.

My pool is going on 10 years old.

3 years ago the motor died on the pump. I replaced just the motor for $180. This year, the housing on the pump developed a crack at the output shaft. Replaced just the housing for $200 (had a pool guy do it this time).

Could you not have just replaced the motor?

The pump housing was damaged when the hex bolts froze in the brass inserts of the plastic pump housing, and the motor flange was corroded so-badly it broke at multiple places.
 

wake74

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Joined
Nov 14, 2015
Messages
372
Location
NC
I'll see your Pentair rust and raise you even more Pentair rust :)

This pump is less than 2 years old. Must have been leaking since new. Of course, outside the warranty period but a very polite email to the Pentair CEO led to a new pump arriving at the house just a few days later. Can't beat that for service.

IMG_6010.jpg


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Fixin'Stuff

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Jun 14, 2016
Messages
584
Location
HotterNHellHouston
I'll see your Pentair rust and raise you even more Pentair rust :)

This pump is less than 2 years old. Must have been leaking since new. Of course, outside the warranty period but a very polite email to the Pentair CEO led to a new pump arriving at the house just a few days later. Can't beat that for service.

IMG_6010.jpg

Impressive carnage! Is that from a salt water pool?
 

yeldogt

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Joined
Jan 2, 2012
Messages
18,184
That's nasty -- have never had one that bad. Thought the Pentair VS typically have 5 year.

Since all the pumps use motors made by the big motor manufacturers ... they all have the same basic construction ... and faults.

They say you can save the cost of the pump going VS -- but it has to last 7 years in my area.

With my old school pool and set up -- I still run twin single speed pumps and the cleaner
 
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wake74

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Nov 14, 2015
Messages
372
Location
NC
Impressive carnage! Is that from a salt water pool?

Yes, it's from a saltwater pool. I'm guessing some sort of defect during manufacturing that led to the shaft seal spraying water into the motor assembly.
 

LS6 Tommy

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Joined
Dec 27, 2013
Messages
26,162
Location
Northern NJ
Whomever is telling you that info about how that pump is so unique is full of ****. Three speed pool pumps have been around for DECADES. I've probably replaced 20 over the years. I realize that model has electronics that up the cost, but $1400.00? I can buy 4", 3 hp sewer ejector pumps with macerators for less than that. IME, a replacement pump body should be around $300.00. A replacement front seal is probably less than $10.00 A motor should be under $200.00.

Tommy
 

yeldogt

Well-known member
Joined
Jan 2, 2012
Messages
18,184
Whomever is telling you that info about how that pump is so unique is full of ****. Three speed pool pumps have been around for DECADES. I've probably replaced 20 over the years. I realize that model has electronics that up the cost, but $1400.00? I can buy 4", 3 hp sewer ejector pumps with macerators for less than that. IME, a replacement pump body should be around $300.00. A replacement front seal is probably less than $10.00 A motor should be under $200.00.

Tommy

I believe the OP is full VS .. they are expensive.
 

yeldogt

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Jan 2, 2012
Messages
18,184
I can't argue with that. I just reread his post and realized I misread "3 HP multi-speed" as "3 speed"...:eek:

Tommy


It seems the value comes when they are installed properly -- and in a pool that's designed for them/ correct fit.

I have a very large rectangle pool -- The filters are fine running w/ 1hp .. but I can't operate all the fountains at full force with only 1hp. The same pump head w/ 1.5 hp motor can run them all .. but then you are running a larger motor when all you want to do is filter. Sand filters/ chlorinators all create back pressures that may exclude the VS motor.

My solution was a dedicated pump ... $1400 buys a bit of electricity.

In theory w/ full VS one could run the filter all the time at partial flow and always be removing surface dirt and use = energy to only running partial.
 

L5wolvesf

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Dec 4, 2011
Messages
1,831
Location
Northern AZ
While recently looking for a different kind of motor I came across a company in AZ that rebuilds pool motors/pumps too. I would imagine there is someone in Miami eho can do them too.
 

ard

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Feb 16, 2015
Messages
4,391
Location
Sierra Foothills... California
Do keep in mind that Pentair has virtually ELIMIATED THE WARRANTY on stuff you buy and install yourself!

If a Pentair Pool Professional installs it, full warranty.

If you do it, I think it is zero. Might be 90 days. Edit: 60 days...

I'm not where I can look it up, but this really pissed me off. It is such a blatant manipulation of the market.....
 
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