Century 1/2 HP Square Flange 56Y Full Rate Motor - B2846



Part # B846

By Century Motors

  4.8 Average  



Part # B846

Warranty 1 Year

Manufacturer Code B2846

Dimensions 11.5" L x 6.5" W x 6.5" D

Alternate Part #'s 1103645401, 1203185410, 135103, 135104, 14796, 164651, 165099, 165904, 168451, 168457, 177078, 186236, 190020, 193266, 193984, 196237, 2K442, 35-5371, 355371, 5KC38NN2520BX, 5KC38NN2520X, 6K946, 7-186236-20, 7-186236-28, 7-193266-20, 75232, 8-186236-20, 8-193266-20, A0104800, A100CH, A100CHL, B2846, B524, C1304, C48J2EC102A2, EB846, P711, SQ105, SQ1052, SQD50FL1, V14796, 35-126-1200, AOSB2846, MGT-60-2846

Product Description

Century Centurion replacement motor for Pentair WhisperFlo and Challenger full rated pumps. Specifications: HP = 1/2, RPM = 3450, Voltage = 115/230, Amps = 10.8/5.4, Service Factor = 1.95, Frame = 56Y, Shaft = Threaded. *Please Note: This is the correct replacement motor for the Challenger 1/2 HP full-rated pump.

Motor Dimensions Motor Dimensions
Motor Image Motor Image

Product Specifications

Motor Name:
0.5 HP B846 & B2846 Replacement Pool Motor
0.5 HP
3450 RPM
230/115 V
5.4/10.8 amp
Service Factor:
Total HP:
0.98 HP
Stock #:
B846 or B2846
Overload Protector:
Dimension Letter:
12.4 in.
Commonly Used On:
Pentair WhisperFlo and Challenger
California Title 20 Compliant

?     Asked on 7/19/2022by Michael Clayton

I'm in California. We have a WFE-2 running our spa circulation system. It has a Century B2846 motor on it now (see attached). Is the B2846 CA title 20 compliant? What would be a suitable variable speed motor replacement, that is Title 20 compliant? Thank you!


A  Answered on 7/20/2022 by InyoPools Product Specialist Craig C.

Hello Michael.  The Century 1/2 HP Square Flange 56Y Full Rate Motor - B2846 is listed as being California Title 20 Compliant.  The V-Green 1.65 HP Square Flange 48Y Variable Speed Motor - ECM16SQU would be a compatible variable speed motor replacement, although the horsepower rating is greater.  The Tune Up Kit Pentair/Purex Whisperflo - GOKIT32 contains the seals and gaskets necessary to complete the motor replacement.  Attached please find the Pentair Whisperflo Pump exploded parts diagram for reference.

?     Asked on 6/8/2022by Tina L Pineiro

Hi. Is this the replacement motor I need? I have Part No.. 7-177449-03 and it needs replaced. It's 1/2 HP and 1.9 SF. Also, when replacing, what other parts are needed? Help.


A  Answered on 6/8/2022 by InyoPools Product Specialist Craig C.

Hello Tina.  The Century 1/2 HP Square Flange 56Y Full Rate Motor - B2846 is the direct motor replacement for the motor, part number 7-177449-03. The beige-colored motor identifies the pump as a Pentair Pool Product.  The Pentair Pool Products models WhisperFlo WFE-2 and SuperFlo 348021 were manufactured with the 177449 motor.  A visual comparison would identify the correct model.  The  Whisperflo - GOKIT32 or SuperFlo - GOKIT78 contains the necessary motor shaft seal, seal plate gasket, and diffuser o-ring to complete the motor replacement.

?     Asked on 4/19/2021by manny

Is this the correct replacement? if so what kit would i need for this?


A  Answered on 4/20/2021 by InyoPools Product Specialist Matt S.

The exact replacement for your current motor (7-177449-03) is the Century 3/4 HP Square Flange 56Y Full Rate EE Motor - B2661. The necessary gasket kit for the Pentair / Purex Whisperflo is the GOKIT32 or the GOKIT32SALT

?     Asked on 5/26/2020by Gary

Obviously this is the correct motor. Can you direct me to the proper diffuser & seals/gasket kit? Thank you


A  Answered on 5/26/2020 by InyoPools Product Specialist Patrick P.

Hi Gary, yes this is the correct replacement motor. You appear to have the Ultra Flo Pool Pump and you will require this Ultra Flo Seal Kit. We put together this Video on How to Replace a Pool Pump Motor which you may find helpful when you tackle this project.

?     Asked on 4/23/2020by Matt

Will this fit my 3/4 HP 1.27hp Pentair Wisperflo


A  Answered on 4/23/2020 by InyoPools Product Specialist Hector F.

Yes, this motor will be the correct single speed replacement motor for your model pool pump. 

?     Asked on 7/6/2019by Martha curiel

I was wondering if this is what I need to get my solar going again. Pump model PE5C-180L and motor model K48J2PA105C1? PLEASE HELP dont know where else to check


A  Answered on 7/8/2019 by InyoPools Product Specialist Joe S.

Hi Martha, yes the B846 would be the correct for that unit and we would suggest Tune Up Kit Sta-Rite Dura-Glas & Max-E-Glas Pump 1998 To Present - GOKIT54.

?     Asked on 3/31/2019by jim carlyle

which tune up kit do i need for the b2846

A  Answered on 3/31/2019 by InyoPools Product Specialist Lennox H.

Hi, Jim. The Whisperflo Tune Up Kit -  GOKIT32 or GOKIT32SALT is also recommended when replacing the motor.

?     Asked on 3/31/2019by jim carlyle

is this b2846 compatible with my whisperflow wfe-2

A  Answered on 3/31/2019 by InyoPools Product Specialist Lennox H.

Hi, Jim. This B2846 can be used, however, the B2845 is the direct replacement which is an energy efficient motor. The Whisperflo Tune Up Kit -  GOKIT32 or GOKIT32SALT is also recommended when replacing the motor.

?     Asked on 12/21/2018by Casey C

My 11 year old Pentair WFE-2 runs a water feature 12 hrs/day. It won't start anymore, just hums & gets hot. I replaced the starter /run capacitor & it still won't start. It had the same problem a couple of years ago & I replaced the cap and it ran flawlessly until now. Can't spin the shaft w/ my fingers anymore but I can start it with a wrench on the shaft & it runs all day. Sounds normal but won't restart by itself. Is this repairable or do I need a new motor, if so, which one. See pics.


A  Answered on 12/24/2018 by InyoPools Product Specialist Lennox H.

Hi, Casey. It sounds like you will need to replace the motor this time. The B2854 along with the Whisperflo Tune Up Kit -  GOKIT32 or GOKIT32SALT are the parts you'll need to get your pump running again. 

?     Asked on 8/7/2016by Chester Wilton

I need to replace a pump motor Pump model No: / Part No: SF-N1-1/2F / 340036 I search for the exact motor replacement but can not find it. Could you tell me what you would recommend replacing it with. Thank you Chet

A  Answered on 8/11/2016 by InyoPools Product Specialist Lennox H.

Hi Chester, The 1/2 HP Pentair OEM Motor (355018S) will have to be special ordered but the B846 is an aftermarket replacement which can be used as a replacement. We also recommend that you replace the seals which are all listed on the Pentair Superflo Parts page.

?     Asked on 4/17/2016by Kim

I need to replace my whisperflo 7-186236-20 motor. I saw a suggestion for the B846, B2846 but it is only 1/2 HP. Mine is 3/4 HP. DO YOU HAVE THE EXACT SAME SPECIFICATIONS BUT FOR A 3/4 Hp motor?

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

It looks like you may be looking for model motor 5231AX

?     Asked on 2/16/2012by Guest

I just finished replacing the shaft seal on my booster pump. As soon as I turned the pump on water was leaking from the shaft seal. Is it defective or am I doing something wrong?

A  Answered on 2/16/2012 by InyoPools Product Specialist Patrick P.

Depending on the model, the installation of a booster pump shaft seal can be slightly different than a pool pump shaft seal. Some booster pump and pool pump shaft seals require that a silicone sealant be used on the outer areas of the metal seat of the shaft seal. The seal will need to be lightly hammered into the body of the pump. You can use a 1 inch PVC coupling or a piece of 1 1/4 inch PVC pipe and a rubber mallet. This procedure will apply to any pool pump or booster pump using a >PS-1000 style shaft seal.

?     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.


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