Century 2.0 HP Square Flange 56Y Full Rate EE Motor - B2843



Part # B2843

By Century Motors

  5 Average  



Part # B2843

Warranty 1 Year

Alternate Part #'s 10855, 11804, 1203195402, 1203195410, 16361, 165201, 165891, 168786, 177117, 177452, 177942, 177979, 182788, 193995, 1K055, 35-5394, 355394, 5U136, 7-177452-03, 71316, AE100G5L, AE100G5LL, AE100GHL, B843, B843A, B866, B866SE, C1284, C1308, EB843, K48N2P102A1, K48N2P103, SQ1202, SQ220E, SQ225UE, SQD20FL1E, SQH25UP1E, AOSB2843, MGT-60-5143

Product Description

Century Centurion replacement motor for Pentair/Purex Challenger Pump. Specifications: HP = 2, RPM = 3450, Voltage = 208-230, Amps = 11.0- 10.0, Service Factor = 1.30, Frame = 56Y, Shaft = Threaded. *Please Note: This is the correct replacement motor for the Challenger 2 HP Energy Efficient pump.

California Title 20 Compliant Options:

Motor Dimensions Motor Dimensions
Motor Image Motor Image

Product Specifications

Motor Name:
2 HP B843 & B2843 Replacement Pool Motor
2 HP
3450 RPM
208 - 230 V
11.0 - 10.2 amp
Service Factor:
Total HP:
2.6 HP
Stock #:
B843 or B2843
Overload Protector:
Dimension Letter:
14.4 in.
Commonly Used On:
Pentair WhisperFlo

?     Asked on 5/16/2020by richard borghese

Motor on this pump is shot. Can I replace it with a vsp pump, higher HP and which "tune up kit" do I purchase to replace pump parts? Thanks.


A  Answered on 5/16/2020 by InyoPools Product Specialist Patrick P.

Hi Richard, Yes you can replace your motor with a new variable speed motor. You would require this 1.65 HP Variable Speed Motor and you will need this 1.5 HP Impeller. Based on the year your pump was manufactured You will also need this Sta-Rite Seal Kit Pre 1998 or this Sta-Rite Seal Kit 1998 and After. If you are not sure if your pump is from before or after 1998, then we put together this Video on How to Determine if your Sta-Rite Pump is Before or After 1998.  We also put together this Video on How to Replace a Pool Pump Motor which you may find helpful when you tackle this project.

?     Asked on 4/13/2019by scoobyi

I live I live in California I need to replace my pool motor 177 452 is model number is not compliant what would be the replacement

A  Answered on 4/14/2019 by InyoPools Product Specialist Lennox H.

Hi, Scoobyi. Your options are the B2984 (Dual Speed) or the ECM27SQU - (Variable Speed) replacement motors.

?     Asked on 6/21/2018by Matt

I have a Pentair UltraFlow pump model 3846880FR with a MagneTek Century Centurion 2HP motor PN 7-177452-03. Checking that replacement motor that I need is an AO Smith B2843, not an SQ1202. Also confirm that GOKIT20 is the right one for me. Thanks.

A  Answered on 6/21/2018 by InyoPools Product Specialist Hector F.

Yes, these are this is the correct motor and seal kit for your application. 

?     Asked on 1/21/2018by Joe

i need new seals and gasket to this pump but i haven’t been able to find them. Where should I be looking?

A  Answered on 1/22/2018 by InyoPools Product Specialist Lennox H.

Hi, Joe. The pump seal and gaskets are based on the pump model, not the motor. You will have to provide us with the model or pictures of you pump in order to locate the correct pump seal and gaskets.  

?     Asked on 7/15/2016by Donn

I ordered the Century Centurion 7-177452-03, 2 hp, 1.3 sf, cont duty, thermal protection, by A.O.Smith. It is for a Pentair Whisper-FLO, MOD# WFE-8. The motor I have has an "DP" Enclosure. The replacement motor has an "ODP" enclosure. The motor is installed outdoors on a concrete slab. ODP is for indoor, dry environments. Is there a DP or TEFC replacement available?

A  Answered on 7/16/2016 by InyoPools Product Specialist Lennox H.

Hi Donn, The labeling has changed, all 1081 pool motors are now labeled as ODP "opened drippedproof."  This motor will replace the current motor that you have. The shaft seal and gaskets will also need to be replaced, the Pentair/Purex Whisperflo Tune Up Kit GOKIT32 or GOKIT32SALT has all the necessary parts.

?     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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