Century 1.0 HP Round Flange 56J Full Rate EE Motor - B128



Part # 5222X

By Century Motors

  4.87 Average  



Part # 5222X

Warranty 1 Year

Manufacturer Code B128

Dimensions 12" L x 8.5" W x 6.5" D

Alternate Part #'s 10-164303-22, 10-164303-23, 101529, 110283, 1103017456, 1104365400, 1104365407, 130243, 133396, 141969, 142814, 14542, 150236, 152560, 152566, 152618, 152770, 158132, 158530, 158536, 158596, 159812, 1610Z-1-B4C, 1610Z-1-BC, 1610Z-1B4C, 164127, 164277, 164303, 16430300, 164361, 164521, 164565, 164583, 164809, 165112, 165217, 165385, 168098, 168710, 177019, 177025, 177073, 177460, 177483, 177500, 184948, 186854, 193632, 19993, 1D195, 1D200, 1K047, 35B1188, 5kcr39sn2818ax, 5KCR39SN2818X, 6K256, 7-164303-23, 7-193632-24, 8-150236-20, 8-158596-20, 8-164809-40, 8-168098-20, 8-168098-21, 8-177019-20, 8-177019-22, 8-177019-24, 90118571, A0564300, ASB128, B105, B1306, B726, C1100, C48L2N131A1, CT110, CT110C, EB128, EST1102, JD10FL1, JL1309A, k63cxerj-4776, MGT605099, P708, S88-173, SP-1610-Z1-B4C, SP-1610-Z1-BC, ST1102, 35-126-1419, AOSB128, MGT-60-5099

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 HP B128 Replacement Pool Motor
1 HP
3450 RPM
230/115 V
7.2/14.4 amp
Service Factor:
Total HP:
1.4 HP
Stock #:
Overload Protector:
Dimension Letter:
12.14 in.
Commonly Used On:
Jandy, Marlow

?     Asked on 8/22/2021by Rebecca Hesni

We are running on our 2nd pump in 6yrs, just burnt up yesterday:dead, billowing smoke, and smelled of burning electrical. Motor is Century/Centurion B128, s#22218CH, pt# 0-164303-23, CX, M56J, 1.0hp, 1.40 sf, 1ph, 3450rpm. I’m sure your 5222x is the replacement. My pump is Hayward SP2607X10, s#21121405000336009. Within the questions I see you told someone that motor won’t work with that pump. You recommended UST1102. Is that correct? Could that be my recurring motor issue? What do I really need?


A  Answered on 12/17/2021 by InyoPools Product Specialist Eric J.

Good afternoon Rebecca, Based on the information provided the recommended motor for the pump model you provided is the UST1102. The correct tune-up kit needed for this would be the GOKIT3.

?     Asked on 5/25/2021by Inyo Visitor

I purchased my pump about a year ago, and now the gasket has basically dissolved. How can I find a replacement? Thanks.


A  Answered on 5/26/2021 by InyoPools Product Specialist Patrick P.

Could you send us a few photos of your pump and motor? Please take a close up shot of the motor label as well as a wide shot of the complete pump to include the pipes going in and out of the pump. To supply photos simply click the reply link below and upload your photos. Once we get those photos we can make the proper recommendation.

?     Asked on 5/20/2021by Tarun Patel

I want to replace the motor on my pool pump. It is Century 1.0 HP Round Flange 56J Full Rate EE Motor - B128. Can you please inform me what seals I will need. There is no make or model on the attachment with the basket. I have posted pictures of what it looks like. Once you send me that info, I can order motor and seals. Thank you.


A  Answered on 5/20/2021 by InyoPools Product Specialist Danny R.

We will need to know the manufacturer and model of the pump.  It looks like a Hayward Super pump.  If you find out it is a Super Pump here is the Tune up kit for that pump... Tune Up Kit Hayward Super Pump - GOKIT3

?     Asked on 5/2/2021by Kevin Coughlin

I am replacing a pump motor and also need the seals. Here is the motor. The pump says Model B91061


A  Answered on 5/7/2021 by InyoPools Product Specialist Patrick P.

Hi Kevin, This is the correct replacement motor for your pump in the photo. Your pump looks similar to a Hayward Super Pump but it is not a Hayward Super Pump. We are thinking the Hayward Super Pump Parts will work as replacement but we are not 100% sure since we have not seen this particular pump before.

?     Asked on 2/22/2020by LAURIE VERSTEGEN

I am in California but this motor can't be shipped here. Below is an image of the motor I need to replace.


A  Answered on 2/24/2020 by InyoPools Product Specialist Lennox H.

Hi, Laurie. Your options are the B2975 (Dual Speed) or ECM16CU (Variable Speed) motors. 

?     Asked on 2/9/2020by Christi

I am replacing the spa motor with a b128 century centurion and I was wondering if I need some sort of kit that goes with it , like seals etc. I have read some previous questions and the part that it screws in to has a model number that has been rubbed off. I have taken pictures of it and thought if There was some way to send them that would be great to help me figure out what other parts I need


A  Answered on 2/10/2020 by InyoPools Product Specialist Lennox H.

Hi, Christi. You have a Jandy JHP Series Pump, you will need the Jandy JHP / JHPU Series Tune Up Kit - GOKIT77

?     Asked on 8/12/2019by Mike

Which mechanical seal should I use with this motor?

A  Answered on 8/13/2019 by InyoPools Product Specialist Steve M.

Mike, the seals are going to be specific to the pump portion that this motor mounts to. In order to suggest the correct seal, we first need to know the model off of the pump this motor mounts to.

?     Asked on 6/17/2019by tracy ann palacios

Hi I am in need of a go kit need to know which one goes with this motor. thank u

A  Answered on 6/19/2019 by InyoPools Product Specialist Matt S.

The seals are matched to a pump housing instead of the motor. What is the model number of the pump housing this motor is bolting to? 

?     Asked on 5/10/2019by al

can u use this in hayward rs pump 3/4 hp change impellar only

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

Hi, Al. You can use this B128 motor along with the SPX3010C impeller to increase the pump's power along with the flow rate.

?     Asked on 11/27/2018by Ray Brockman

How do I trouble shoot a century B128 pump motor for electrical problem When I turn the motor pump on it flashes from rear then trips breaker and blows a frn-r 20 amp fuse is it repairable. Or does the motor need to be replaced

A  Answered on 11/27/2018 by InyoPools Product Specialist Lennox H.

Hi, Ray. You can use either our Pool Motor Troubleshooting or the A.O. Smith Troubleshooting Guide to diagnose the cause if your motor failure. 

?     Asked on 6/13/2018by JOHN

I currently have this motor installed. What would a 2 speed replacement option be? The motor is running great, just looking to improve efficiency.

A  Answered on 6/14/2018 by InyoPools Product Specialist Megan C.

If you have the voltage to connect to 208-230V the 1 HP Full Rate Two Speed Motor W/ Timer - Round Flange (B975T, B2975T) or the 1.65 HP Variable Speed Pool Pump Motor Round Flange - ECM16CU Please make sure you replace the Pool Pump Shaft Seals when replacing the motor.

?     Asked on 6/12/2018by JD

Can I install this on a stock Hayward SP2607x10?

A  Answered on 6/12/2018 by InyoPools Product Specialist Hector F.

No, actually the replacement motor for this stock Hayward Super Pump is part number UST1102

?     Asked on 6/5/2018by Eric v

I have a century cat B128, part 7-164303-23, serial bx8-12. It is making a humming noise and not spinning the shaft bit the shaft will spin by hand. I think I just need a new capacitor. Can you tell me what capacitor is the direct replacement for this motor? Thanks.

A  Answered on 6/5/2018 by InyoPools Product Specialist Lennox H.

Hi, Eric V. Before replacing the capacitor, you can test it using our How to Test a Pool Pump Capacitor. If the capacitor is bad, then you can replace, with P/N 628318-307

?     Asked on 4/21/2018by Inyo Visitor

Does this motor come with a warranty? Also, which GOKIT would I need to order for this motor? Thanks.

A  Answered on 4/23/2018 by InyoPools Product Specialist Hector F.

These motors come with a one-year manufacturer warranty and in order to cross reference the correct seal kit, we will need to know the model name or number of the front pump housing that the motor bolts to. 

?     Asked on 11/13/2017by Michael Larson

I need a replacement for AO Smith 0-164303-23 motor that has gone bad. Which pump is the best replacement pump?

A  Answered on 11/14/2017 by InyoPools Product Specialist Hector F.

This model 5222X is the correct motor replacement for the model 0-164303-23 motor. 

?     Asked on 7/12/2017by Inyo Visitor

i have a century centurion motor b128 0-164303-23 and I am wondering if I wanted to change to a higher hp motor than the 1hp what would be a good replacement.

A  Answered on 7/13/2017 by InyoPools Product Specialist Patrick P.

You could go up to the B129 1.5 HP Motor but you would need to upgrade your impeller to 1.5 HP. We would need to know the make and model of your pump to suggest the proper impeller. Common pumps are the Hayward Super Pump, Jandy Stealth Pump, etc.. Please reply to this email with your pump information and we will suggest the proper impeller.

?     Asked on 6/24/2017by Douglas


A  Answered on 6/29/2017 by InyoPools Product Specialist Lennox H.

Douglas, This Century B128 Motor is compatible with the Jandy PHPU1.5 pump model. 

?     Asked on 6/20/2017by Dave

Will this fit on a EB229? What tune up kit (gaskets, etc.) is made for this? Thanks.

A  Answered on 6/20/2017 by InyoPools Product Specialist Patrick P.

Hi Dave, The B229SE 1.5 HP Uprated Motor would be the proper replacement for your EB229 motor.

?     Asked on 5/20/2017by Mike

Will this motor, b128, replace a motor on a Hayward super pump?

A  Answered on 5/21/2017 by InyoPools Product Specialist Lennox H.

Hi, Mike. A B128 motor can fit on a Hayward Super Pump but you really don't see a lot of full rate motor being used. If you can get me the PART, CAT, or MOD # off of the current motor I will be able to confirm.

?     Asked on 3/23/2017by scott waidelich

My pool uses this exact motor & pump (just bought this house) with a part number O-134303-03, serial OB06. I already replaced the capacitor. The motor sounds loud. was this pump manufactured in 2003? How long do these motors typically last?Should I replace the motor with the exact one or is there a more efficient motor pump assembly that is reasonably priced and more efficient? Should I replace the pump if I replace the motor now? Which pump do you recommend?

A  Answered on 3/23/2017 by InyoPools Product Specialist Lennox H.

Hi, Scott. I can't tell you when this motor was manufactured based on the info provided. These motors also do not have a lifespan, it just depends on how it is maintained. I would recommend a more energy efficient motor like the B654 or the ECM16CU. You don't have to replace the pump if you're replacing the motor. If the pump is more than 10 years old then you should consider replacing the entire pump. If you can get me the pump housing model I can provide you with some options.

?     Asked on 1/9/2017by michael

Is there any way to determine approximate year of manufacture for a motor. I have CAT B128 / PART O-1644303-23 SERIAL 0I06

A  Answered on 1/9/2017 by InyoPools Product Specialist Adam Y.

Good afternoon Michael, Sometimes they put the last two digits in the middle. In this case your motor would be a 2003. This isn't always the case thou. You can call A.O smith @ 1-866-887-5216. Give them the number and they can tell by that what year.

?     Asked on 10/7/2016by Brian

I have a Century Centurion - CAT B128, Serial 18813CH, Type CX, Frame M56J, HP 1.0, SF 1.40, PH1, RPM 3450, Form KJM, Code J. Is this a direct replacement? It appears it is - but I would like to confirm before ordering.

A  Answered on 10/13/2016 by InyoPools Product Specialist Lennox H.

Hi Brian, Yes, this B128 motor is a direct replacement for the motor that you have.

?     Asked on 9/6/2016by Brian

I have a Jandy sheath ( jhp1 ) with a 1hp AO Smith century centurion motor, FR-M56J, type-cx, rpm 3450. When I turn it on the motor makes a humming sound and doesn't come on. If the motor needs to be replaced can I replace it with a energy efficient motor and have it bolt up to my current Jandy sheath pump?

A  Answered on 9/30/2016 by InyoPools Product Specialist Scott W.

Yes, the energy efficient motor you would want is part number UCT1152. It is a 1.5HP motor but the total horsepower on the UCT1152 and the B128 are the same.

?     Asked on 7/9/2016by Hector

I have AO Smith Standard 1hp UST1102 and I have burned out two and want upgrade. Can upgrade to this one B128? Now my UST1102 was 5-5/8" and this one is 6-7/16" will it still work.

A  Answered on 7/15/2016 by InyoPools Product Specialist Lennox H.

Hi Hector, You can upgrade to the B128 if you system can handle the additional water flow because the B128 motor is a high performance motor which has a higher total horsepower. You will also have to replace the impeller.

?     Asked on 5/27/2016by kelvin

My motor is a b128 ao smith however the frame number on the tag says M56J all the ones i see dont have the M is that important

A  Answered on 5/28/2016 by InyoPools Product Specialist Lennox H.

Hi Kelvin, The "M" is not important, this B128 motor is a direct replacement to yours.

?     Asked on 4/18/2016by Joe Olah

I have a GE 5kcr39sn2818ax pump motor. Is this the correct replacement?

A  Answered on 4/18/2016 by InyoPools Product Specialist Hector F.

The correct motor replacement is the B656.

?     Asked on 4/9/2016by Rich Paulding

I have and jandy jhp1.0 stealth is this the correct replacement motor?

A  Answered on 4/11/2016 by InyoPools Product Specialist Hector F.

Yes this is a correct replacement motor for that pump model.

?     Asked on 3/23/2016by Bob

I have a Jandy JHPU1.0 pump with a bad motor. Is this motor compatible?

A  Answered on 3/24/2016 by InyoPools Product Specialist Matt S.

Bob, actually you need a 1 HP uprated motor, which is the B228SE. And don't forget the gasket kit that makes sure your pump is watertight when you reassemble it. The JHPU & JHP gasket kit is the GOKIT77.

?     Asked on 1/27/2016by Inyo Visitor

I currently have this motor and will need to replace it. I would like to replace it with a variable speed motor. What model variable speed can I purchase that will be the simplest to replace the B128?

A  Answered on 1/29/2016 by InyoPools Product Specialist Lennox H.

Hi, The A.O. Smith 1.65 HP Round Flange Variable Speed Pool Pump Motor (ECM16CU) will be the variable speed replacement motor.

?     Asked on 9/8/2015by Inyo Visitor

If this does not fit, is it returnable, Seems to match up etc.

A  Answered on 9/11/2015 by InyoPools Product Specialist Joe S.

Return Policy* 20% Restocking Fee* Must be Within 30 Days of Purchase* Must be in New, Unused and Unopened Condition* Must be in original packaging with no markings on the product or packaging* Customer is Responsible for Outbound & Return Shipping Charges* Original outbound shipping & handling fee are non-refundable

?     Asked on 9/6/2015by jim

I have the 128 model and replaced the same pump. Pump come internally wired for 230, correct? I have 230 wiring so does my white wire go to L1 and Black goes to L2? This is how I have it wired and it seems like it's pushing less water.

A  Answered on 9/10/2015 by InyoPools Product Specialist Lennox H.

Hi Jim, The motor is wired correctly. I would recommend checking the impeller, cleaning out the filter and skimmer. If those are clogged it will cause low water pressure.

?     Asked on 8/24/2015by Jack

What about gaskets, Orings, seals,etc? Are they included or available to complete the installation?

A  Answered on 8/24/2015 by InyoPools Product Specialist Brian M.

Seal, O-ring and gaskets are typically always avaiable. To get the correct ones, we would need to know the housing this motor is getting bolted up to. The motor can fit on multiple applications.

?     Asked on 8/1/2015by Steve Ryan

I have a Century Centurion pool pump Part 7-164303-23 Cat B128 1 hp Replacement cost ?

A  Answered on 8/3/2015 by InyoPools Product Specialist Joe S.

Hello Steve, Yes the 5222x will be your replacement motor

?     Asked on 10/21/2014by Raymond

I have a Century Centurion 1.0 HP Pump motor (AO Smith) with a part number of 193632-24, type CX, M56J, serial CA 12-13, rpm 3450 60 Hz 230/115 volts, SF 1.4, amps 7.2/14.4. Attaches to a Jandy pool pump, model # JHP1.0, Serial #106FB0520. Looking for a replacement motor! Please include replacement part # and pricing. Thanks!

A  Answered on 10/21/2014 by InyoPools Product Specialist Robert M.

Hello Raymond - This motor is the direct replacement motor for the JHP1.0 and it matches all of your specifications. The Century model number is B128 and our part number is 5222X. The pricing for this number can be found at the top of this page.

?     Asked on 1/19/2012by Guest

I'm trying to replace the motor on my pool pump but all these numbers and abbreviations on the motor label are really confusing me. What do they mean?

A  Answered on 1/19/2012 by InyoPools Product Specialist Patrick P.

Replacing a pool pump motor is not as difficult as it seems. You can try looking here. If you need help figuring out what the information on your label means. If you are still having difficulty figuring it out you can call us at our toll free number or you can send us a photo of your motor label here.

?     Asked on 1/12/2012by Guest

Why should I purchase a Tune Up Kit?

A  Answered on 1/12/2012 by InyoPools Product Specialist Patrick P.

A Tune Up Kit includes all of the essential replacement seals and gaskets for the pump. The seals and gaskets should be replaced when installing a new motor on your pump. New seals will prevent the pump from leaking water or losing the prime. A Tune Up Kit will protect your motor and ensure that the pump is working efficiently.

?     Asked on 1/12/2012by Guest

Why do I need to purchase a new shaft seal?

A  Answered on 1/12/2012 by InyoPools Product Specialist Patrick P.

We strongly recommend replacing the shaft seal. The purpose of a shaft seal is to prevent water from running down the shaft of the motor and into the motor housing. Water will damage the bearings and cause the motor to fail. A new shaft seal should be installed whenever a motor is replaced. The motor manufacturer can deny the warranty if the motor fails to due to water damage from a faulty shaft seal. To find your shaft seal you will need to visit our Pool Pump Parts Page or the Spa Pump Parts Page and select your make and model.

?     Asked on 1/11/2012by 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.


Review Summary

 (Average 4.87  out of 5 stars)
15 Rating
5 star:
4 star:
3 star:
2 star:
1 star:

The Most Helpful Review

The Most Recent Reviews