Century 1.5 HP Round Flange 56J Full Rate EE Motor - B129



Part # 5223X

By Century Motors

  4.41 Average  



Part # 5223X

Warranty 1 Year

Manufacturer Code B129

Alternate Part #'s 0-164304-24, 10-164304-22, 110284, 1104375400, 1104375407, 113687, 141970, 142815, 150237, 152561, 152567, 152619, 152771, 158133, 159813, 159986, 16055, 1615Z-1-1BC, 1615Z-1-B4C, 1615Z-1-BC, 164125, 164129, 164278, 164304, 16430400, 164362, 164522, 164566, 164584, 164810, 165113, 165218, 165386, 168099, 17318, 173792, 177020, 177026, 177032, 177074, 177171, 177391, 177461, 177501, 184949, 186855, 193633, 1D193, 1D201, 35B1189, 5KCR49UN2088X, 6K267, 7-164304-24, 7-193633-24, 7-193633-74, 8-164304-22, 8-168099-20, 8-177020-20, 8-177020-21, 8-177020-23, 8-184949-21, 8-193633-24, 90118589, A0564400, B107, B709, B728, C1101, CT115, CT115C, EB129, EST1152, JD15FL1, MGT605100, P709, S88-175, SP-1615-Z1-1BC, SP-1615-Z1-B4C, SP-1615-Z1-BC

Product Description


Note: NOT California Title 20 Compliant. 

California Title 20 Compliant Options:

Motor Dimensions Motor Dimensions
Motor Image Motor Image

Product Specifications

Motor Name:
1.5 HP B129 Replacement Pool Motor
1.5 HP
3450 RPM
230/115 V
9.2/18.4 amp
Service Factor:
Total HP:
1.95 HP
Stock #:
Overload Protector:
Dimension Letter:
13.50 in.
Commonly Used On:
Jandy, Marlow

?     Asked on 10/12/2019 by Pat

Need model number for my current motor: Century 1.5 hp, 230/115 V, 8/16 amps, 60 hz, 3450 rpm, Part 7-184949-22, Type CX, 50 C constant, DP Enclosure, FR P56J Form KJM, Class B, Code K

A  Answered on 10/14/2019 by InyoPools Product Specialist Hector F.

The replacement single speed motor for your 184949 is the 5222AX

?     Asked on 8/18/2019 by Scott Poulton

I have to replace my pool pump motor its an AO Smith B795 is this the right motor I ordered. I am attaching pictures. Please advise I ordered the right motor and tune up kit.


A  Answered on 8/22/2019 by InyoPools Product Specialist Joe S.

Based on the B795 you will need to order the Motor 56c Keyed Full 1.5 Hp (b123).

?     Asked on 8/13/2019 by kathi kiel

Have cracked hayward 30" pro series sand pool filter, no markings legible. Pool is only 11000 gallons, has this motor on the pump. Sounds like I could downsize a replacement filter as long as this motor matches GPM. Is that right and does it match? Thanks.

A  Answered on 8/13/2019 by InyoPools Product Specialist Lennox H.

Hi, Kathi. The filter is sized based on the flow rate of the pump. In order to calculate the pump's flow rate, you will need to know the Total Dynamic Head (TDH) of your pool. 

?     Asked on 6/15/2019 by

I have a century centurion A.O. Smith swimming pool motor, Frame P56J, Part #7-164304-24, 1.5 HP, CAT #B129; is this the 1.5 HP round flange unit the proper motor to replace the motor that has a loud laboring sound; still works with good pressure, but the noise is very annoying? The distance between the four bolt holes is approximately 6 inches. See attached (2) pictures.


A  Answered on 6/19/2019 by InyoPools Product Specialist Hector F.

Yes, this would be the correct replacement motor for your motor model. 

?     Asked on 6/14/2019 by Dick

What does full rate EE motor mean ???

A  Answered on 6/14/2019 by InyoPools Product Specialist Lennox H.

Hi, Dick. The term EE means Energy Efficient. 

?     Asked on 5/29/2019 by Robert

Hello. I have a 2004 Jandy setup. I want to replace my pump and I'm pretty sure the exact replacement is your P129. Attaching pictures of current pump. I understand I'll need to replace the Shaft Seal. Anything else? (o-rings, etc.) What I want is the same single speed 1.5 HP, 3450rpm but I'd like a quieter more efficient running pump that matches what I have. Hoping maybe this P129 is newer and quieter? Do you suggest something different? Not wanting the variable speed types. Thanks!


A  Answered on 5/29/2019 by InyoPools Product Specialist Lennox H.

Hi, Robert. This B129 is the best replacement option available. You will also need to get the Jandy JHP Series Tune Up Kit - GOKIT77 to complete the installation. 

  • Commented on 5/29/2019 by Product Owner

    thanks. One more question. Does this new pump come with a cap on the rear? Something to protect the wiring plate from rain? Or can I purchase that separately?

    • Commented on 6/6/2019 by InyoPools Product Specialist Patrick P.

      Yes the motor end cap is included with the motor, you might also consider a Motor Cover to give extra protection from the elements.

?     Asked on 5/23/2019 by Brewman

Replacing pump /motor, 16000gal pool. AO Smith 193633-24 1.5hp and older Hayward pump. 2" pipe. 230v. Hayward DE-6000 filter. Rooftop solar removed last week so less head to deal with. Considering 2sp and variable. Can I replace with 1hp. If not, what are my options? I could not get photos to add here so if you wish i can send email or ?

A  Answered on 5/25/2019 by InyoPools Product Specialist Patrick P.

Hi Brewman, You could go with this 2.7 HP Variable Speed Replacement Motor and you would not need to replace any other parts on your pump except the seal kit, which is always suggested to replace when replacing your motor. You could possibly go with the 1.65 HP Variable Speed Replacement or the 1 HP Variable Speed Replacement but you would need to change out your impeller to do this. Could you click the reply link below and let us know which Hayward Pump you have (i.e. Super Pump, Super II, Tri Star, North Star, Max Flo, etc..) this will allow us to suggest the proper replacement impeller.

?     Asked on 5/19/2019 by

Squealing motor. Bearings I guess. I have added pictures of my pump and motor plate. Apart from the seal kit and the B129 motor would I need anything else ? Is the motor suitable for my pump or would I need more HP ? Thank you.


A  Answered on 5/20/2019 by InyoPools Product Specialist Patrick P.

This B129 is the proper replacement motor for the motor in your photos. You will also need this Hayward Super II Tune-Up Kit We have this Video on How to Replace a Pool Pump Motor which you may find helpful when you tackle this project.

?     Asked on 5/12/2019 by

is it required to be the seal?

A  Answered on 5/12/2019 by InyoPools Product Specialist Hector F.

I believe that you are referring to needing to change the main shaft seal. If so, then yes it is recommended to be changed. You will need to know the model name or number of the pump housing that the motor actually bolts to in order to cross reference that seal. If you cannot locate that information then you can email images of that housing to upload@inyopools.com so we can try and identify that model for you. 

?     Asked on 5/10/2019 by Ron

Does the seal come with this motor? If not, which seal is required?

A  Answered on 5/10/2019 by InyoPools Product Specialist Lennox H.

Hi, Ron. The seals are sold separately which are specific to the pump housing. 

?     Asked on 2/6/2019 by Jay Adamo.

I have the A.O. Smith 1.5 hp motor-B129. It is a slightly older Motor. I tried to convert a photo but it would not work. Suddenly hums & will not start. Then trips the breaker. Is it a starter solenoid problem? Can I get a replacement part without buying a whole new Motor. ? Thanks J.

A  Answered on 2/6/2019 by InyoPools Product Specialist Lennox H.

Hi, Jay. Only a few replacement parts are available for these motor. You can use the A.O. Smith Troubleshooting Guide to diagnose where the problem is.

?     Asked on 10/17/2018 by Larry

I’m replacing the motor on my pool. The motor on now is the A.O Smith Cat. B129, 1.5 hp. The pump is a Hayward 3010x. Does this motor bolt up directly or does it need an adapter? Also, do I need the tune-up kit. The motor makes a high pitched squeal when running and does not pump water. Does that sound like the motor?

A  Answered on 10/17/2018 by InyoPools Product Specialist Andy O.

Hello Larry- Yes, the loud squeal is a motor bearing issue. I would highly recommend changing the motor. The Motor 56j Thrd Full 1.5 Hp (b129) will bolt right up to your pump without the need of any adapters. You will also need the Tune Up Kit Hayward Super II - GOKIT2.

?     Asked on 10/17/2018 by

What is the warranty on this motor?

A  Answered on 10/17/2018 by InyoPools Product Specialist Lennox H.

Hi. This motor is warrantied for 1 year from date of install. 

?     Asked on 7/15/2018 by Burt Roldan

need to replace motor. S/N BY06-09 P/N 193633- 24 TYPE: CX FR: P56J Volt: 230/115 AMPS: SF 9.2/18.4 Time: CONT ENCL: DP FORM: KJM CODE: H INS.: B AMB: 50 C What is your recommendation. Thanks.

A  Answered on 7/16/2018 by InyoPools Product Specialist Hector F.

The direct replacement motor for your model 193633 motor is the 5213x. If you would like a variable speed option then it would be the model ECM27CU

?     Asked on 6/15/2018 by chawn cone

I am looking at this pump motor B129 1.5 HP Motor . I need the impeller that goes with it. can you recommend one.

A  Answered on 6/16/2018 by InyoPools Product Specialist Andy O.

Hello Chawn- To recommend the correct impeller we would need the model of your pump, not your motor. If you can provide us with that information we can recommend an impeller.

?     Asked on 5/25/2018 by chawn cone

I am looking at this pump motor B129 1.5 HP Motor . I need the impeller that goes with and I am also looking at replacing the filter system what would be a good option for this motor? thank you

A  Answered on 5/26/2018 by InyoPools Product Specialist Patrick P.

Hi, Chawn this would be the proper replacement motor for your B129 but to determine the impeller you require then we would need to know the make and model of your pump. Could you send us a few photos showing a wide shot of your complete pump to include where the pipes come in and out of the pump? Also, could you supply some photos which show both your pump and filter as this would help us suggest a filter as well? You can simply reply back to this email with your photos.

?     Asked on 5/17/2018 by Mason

Will this part replace my A.O. Smith 1.5 HP Part # 7-184949-22, Serial # BZ07-01, FR: P56J, Insul class: B, Code: K, Form KJM, volts: 230/115, RPM: 3450, amps: 8.0/16?

A  Answered on 5/17/2018 by InyoPools Product Specialist Hector F.

No, actually the correct replacement motor would be the model 5222ax

?     Asked on 10/24/2017 by ken

I have a Century Centurion B129, Is that an access point at the rear motor cover for exposing the shaft to hold the shaft securely when replacing the seal or do I have to remove the 4 long screws and then remove the back cover for the necessary access. I can;t tell because this pump is a rebuilt and has a thick cover of black paint on the 4 screws and the access point in question

A  Answered on 10/25/2017 by InyoPools Product Specialist Lennox H.

Hi, Ken. The shaft access is located directly in the center of the rear end of the motor as shown in this image >B129 Rear View.

?     Asked on 9/9/2017 by Rob

This is the model motor that is on my rather old Hayward Superpump II. Is there a similar fit motor whose effective horsepower would be 1HP versus ~2HP here? I'd be good with a dual speed as well.

A  Answered on 9/13/2017 by InyoPools Product Specialist Patrick P.

Hi Rob, If you currently have the B129 motor on your Hayward Super II then you can down to a B127 Replacement Motor which has a true HP of 1.13. If you go this route you would need to replace your impeller with this 1 HP Super II Impeller. The reason for needing the new impeller is your 2 HP impeller would overwork this motor. When replacing your motor we would also suggest this Hayward Super II Tune Up Kit. If you wanted to go dual speed you would need this Dual Speed Replacement Motor along with the same impeller and seal kit suggested earlier. The smaller HP will have a lower output of water so if you have spa jets or solar then you may want to stay with the larger HP.

?     Asked on 7/31/2017 by Lawankia Williams

I need to replace my motor I believe this is the one I need to purchase but I would like to make sure. I have a Century Centurion A.O.Smith CAT B129 Part: 7-164304-24 TYPE CX FR P56J HP 1.5 SF 1.30 HZ 60 RPM 3450 VOLTS 230/115. Also, what all will I need? Will the Seal come with it or is that a separate purchase?

A  Answered on 8/2/2017 by InyoPools Product Specialist Alex V.

Lawankia, The B129 would be the correct motor. We recommend replacing the shaft seal when replacing the motor. 

?     Asked on 7/6/2017 by

will this pump replace a Marlow J100EC15

A  Answered on 7/13/2017 by InyoPools Product Specialist Lennox H.

Hi. I was not able to confirm if this motor can be used with the Marlow J100EC15 pump. If you can provide the motor's Part or Cat No., I can use that to locate the correct replacement. 

?     Asked on 6/17/2017 by Kelly

Is there N energy efficient replacement for the B129 motor?

A  Answered on 6/25/2017 by InyoPools Product Specialist Lennox H.

Hi, Kelly. There is not a more energy efficient motor that will replace this motor. 

?     Asked on 5/24/2017 by

I have an older Century pump with a motor 1081 pool pump duty mount horiz with vent holes down. Part 8-164300-20 1.5 hp. Is the 56j Thrd Full 1.5 Hp (b129) the correct replacement? Thanks

A  Answered on 5/24/2017 by InyoPools Product Specialist Hector F.

The part number for your replacement motor is 5204X(b123).

?     Asked on 5/8/2017 by Robert Janson

I had received an email with a $5 off offer but when I look at the email I do not see a promo code to enter on the purchase form

A  Answered on 5/8/2017 by InyoPools Product Specialist Scott W.

Here is a reward code you can use: BECCGHFCL

?     Asked on 3/28/2017 by Vinay

I have a Jandy Stealth Pump JHP 1.5HP, with a Century Centurion AO Smith motor on it (CAT Serial # CB04-11), Part # 7-193633-24 (motor label does not state HP). The motor has blown (on day of pool closing pool pump was not working, and motor was hot). I am looking to replace the motor - what model AO Smith should I buy? And do I need to buy any other parts along with the motor? Is it okay to replace motor only?

A  Answered on 3/28/2017 by InyoPools Product Specialist Scott W.

Yes, the 5223X is the correct replacement motor and the seal kit you would want to purchase with your motor is the GOKIT77. It is fine to only replace these if the pump housing is not cracked or leaking.

?     Asked on 3/26/2017 by Bernie

I just bought 2 of these and there is no capacitor with them. How can that be?

A  Answered on 3/28/2017 by InyoPools Product Specialist Andy O.

Hello Bernie- The Motor 56j Thrd Full 1.5 Hp (b129) should have a run capacitor located on the top of the motor as pictured.

?     Asked on 3/20/2017 by D Law

Trying to sell an investment property that has an AO Smith Centurian pool pump. Potential buyer wants to know the age of the pump. CAT129 Serial 007083M Part 7-164304-24

A  Answered on 3/21/2017 by InyoPools Product Specialist Lennox H.

Hi, D Law. I can only tell you when the motor was manufactured because the motor is different from the pump. The motor you have was manufactured on January 7, 2008.

?     Asked on 3/10/2017 by John Anderson

Do you have parts for this P56J to rebuild pump?

A  Answered on 3/10/2017 by InyoPools Product Specialist Lennox H.

Hi, John. Here's the link Motor Parts to all of the parts we have for A.O. Smith/Century motors.

?     Asked on 11/26/2016 by Geep Maley

I have a Jandy Stealth JHPU2.0 pump from 2004. Existing Motor is 7-193633-24 but doesn't state HP or SF on it. Need a new motor. Have heard B129 or the B230SE is correct? Also considering going to two speed. What would be the right motor and any issues to be concerned with?

A  Answered on 11/28/2016 by InyoPools Product Specialist Hector F.

Yes those two motors are correct single speed replacements and the dual speed we would recommend is the B977T. There are no real issues to be concerned with on the dual speed. Just getting used to the control on the motor itself. 

?     Asked on 8/21/2016 by Janis

I have a B129 motor which hums, but won't start. I have tried turning it off and on and it did finally start after several tries, but not any more. The propellor does turn. I assume it needs a new capacitor. What would be the correct part number to order?

A  Answered on 8/23/2016 by InyoPools Product Specialist Scott W.

The capacitor for the B129 is part number 5270-08.

?     Asked on 8/6/2016 by Ed

Hi, I have a AO Smith, Part# 7-184950-22 motor currently which is connected to Jacuzzi Magnum Force Pump. Will the B129 fit this unit. I am being told by my pool tech that it will but I have noticed that some of the specs are not 100% matching. For example the Amps don't match perfectly and the SF is showing 1.5 where I believe this motor is a 1.3 SF. I have never had such a hard time finding a match.........

A  Answered on 8/16/2016 by InyoPools Product Specialist Lennox H.

Hi Ed, This B129 motor can be used as a replacement but the B796 which is the energy efficient motor and the direct replacement for Part # 7-184950-22.

?     Asked on 6/24/2016 by Rob

I have an old AO Smith-labeled filter motor coupled to a 1MF-S pump with 1.5 HP impeller, 40k gal pool. The motor plate states 1.5 HP (1.10 SF), and Part 7-184949-22, which should be either 1.5 or 1.65 THP depending on interpretation. That part number seems to cross-reference to the B654 motor, which is only 1.4 THP. Based on THP matching, I would have used this B129 motor with 1.95 THP instead. Will the B129 work with this application?

A  Answered on 6/30/2016 by InyoPools Product Specialist Lennox H.

Hi Rob, Based on the Jacuzzi Pump model # 1MF-S, the B654 is the correct replacement motor. The B129 motor will be too powerful.

?     Asked on 6/2/2016 by David Brown

I have a century centurion B229 and it seems to have the same specs. as the B129? can you tell me if they are the same and interchangeable? Thanks, David

A  Answered on 6/7/2016 by InyoPools Product Specialist Lennox H.

Hi David, The B229SE is the correct replacement, the B129 motor has a higher total hp that the B129 motor so it will not be an exact match.

?     Asked on 6/2/2016 by David Brown

i have a marlow Argonaut type pump the motor is a century B229. I need a new motor but I only see a B129 ( 5223X ) listed, is this the same motor? can us it as a direct replacement? thank you. David

A  Answered on 6/7/2016 by InyoPools Product Specialist Lennox H.

Hi David,  The B229SE motor is the correct motor you will need to replace your current B229 motor.

?     Asked on 5/21/2016 by Peter Valentine

I have this motor and the impeller brok off at the end of the stem. How do I find the right impeller to replace the impeller?

A  Answered on 5/21/2016 by InyoPools Product Specialist Patrick P.

Hi Peter there should be a part # embossed into the impeller, if you can find this then just enter the part # into our search box and the impeller should come up. You can also email us a photo of your pump and motor label and that will allow us to determine which impeller you require.

?     Asked on 9/20/2015 by Shannon

I have this motor, however I have a crack somewhere in the Hayward pump but I am unable to find a model number to replace the part. Can you tell me which Hayward pump this motor would sit in? Also since I have this motor is there a better more efficient motor I could replace it with?

A  Answered on 9/25/2015 by InyoPools Product Specialist Lennox H.

Hi Shannon, We can not identify the pump model off of the motor. If you can send us photos of the pump housing we can identify it that way.

?     Asked on 9/5/2015 by rob

I have a motor (part # 7-193633-24) in a Jandy HHP (2005 or older) what model dual speed motor would replace it?

A  Answered on 9/9/2015 by InyoPools Product Specialist Lennox H.

Hi Rob, The 1.5 HP Full Rate Two Speed Motor W/ Timer - Round Flange (B977T, B2977T) would be the replacement dual speed motor for p/n 7-193633-24.

?     Asked on 7/24/2015 by Jacob

can you tell me what is the capacitor model number for this motor 10-164304-22

A  Answered on 7/24/2015 by InyoPools Product Specialist Charlie R.

Jacob,The correct capacitor for motor B129 is part number 628318-307. It's an AO Smith Replacement capacitor, 25MFD 370V.

?     Asked on 1/11/2012 by Guest

What is Service Factor?

A  Answered on 1/11/2012 by InyoPools Product Specialist Patrick P.

Service Factor(SF) is a multiplier that when multiplied by the horsepower of the motor indicates the total permissible horsepower loading that may be carried when the motor is operating at rated voltage and frequency. The most important thing to remember when replacing a motor is that the replacement motor's horsepower times its service factor must be equal to or greater than the original motor's horsepower times its service factor. The Service Factor rating can be found on the motor label. See Step 4 of our How to Read a Pool Motor Label guide.


Est. Repair Time

More than 8 hrs

Tools Needed

Screwdriver, Nut Drivers, Pliers, Socket Set, Wrench Set, Hammer and nut driver to tighten pool pump ring to stop water leaking

Replaced Pool Pump Motor

Written on 8/31/2019 by Rob T.

Turned off electric power, disconnected pool pump from pump motor, removed difuser, removed motor seal, replaced motor seal, reassembled difuser and other components, replaced some seals and a pool pumps assembly gasket, and a gasket inside the pool pump body. Instructions unclear about which seals and gaskets were to be used to replace those in the Magnum Force Pump and motor. Would be helpful for at least minimal instructions or schematics as to where gasket and seals were to be placed.

Were these instructions helpful? 


Review Summary

 (Average 4.41  out of 5 stars)
5 Rating
5 star:
4 star:
3 star:
2 star:
1 star:

The Most Helpful Review

The Most Recent Reviews