3/4 HP Standard Motor - Full Rate (B847, B2847)



Part # B847

By A. O. Smith

  4.79 Average  



Part # B847

Manufacturer Code B2847

Dimensions 12.5" L x 6.5" W x 6.5" D

Alternate Part #'s 0-177474-01, 1-168919-06, 10-168919-06, 10-177079-04, 1103655401, 1103655402, 135105, 15815, 164652, 164961, 165190, 165903, 168452, 168919, 177079, 177215, 177474, 190021, 193267, 193985, 35-5339, 35-5399, 355339, 5KC38SN6085AX, 5KC38SN6085X, 5U124, 5U159, 6-177079-40, 7-168452-04, 7-168452-84, 7-177079-04, 7-177474-01, 7-177474-61, 7-177474-81, 75233, 8-165903-20, 8-165903-21, 8-168452-04, 8-168452-20, 8-177079-04, 8-177079-40, 8-177474-01, 8-177474-10, A0104900, A100DH, A100DHL, B623, B847, C1305, C48K2EB102A2, EB847, ESQ1072, P712, S88-380, SQ107, SQ1072, SQD75FL1, V15815

Product Description

A.O. Smith Centurion replacement motor for Pentair WhisperFlo and Challenger full rated pumps. Specifications: HP = 3/4, RPM = 3450, Voltage = 115/230, Amps = 14.2/7.1, Service Factor = 1.65, Frame = 56Y, Shaft = Threaded. *Please Note: This is the correct replacement motor for the Challenger 3/4 HP full-rated pump.

Motor Dimensions Motor Dimensions
Motor Image Motor Image

Product Specifications

Motor Name:
0.75 HP B847 & B2847 Replacement Pool Motor
0.75 HP
3450 RPM
230/115 V
6.6/13.2 amp
Service Factor:
Total HP:
1.24 HP
Stock #:
B847 or B2847
Overload Protector:
Dimension Letter:
12.4 in.
Commonly Used On:
Pentair WhisperFlo and Challenger

?     Asked on 8/5/2017 by roh

i have a 3 quarter horse model 196327 by pentair superflow will this fit thankyou

A     Answered on 8/5/2017 by InyoPools Product Specialist Alex V.

Roh, There are two 3/4HP motors that will fit. The determining factor will be which motor had a matching service factor (S.F.# listed on your motor label). 

?     Asked on 6/27/2017 by

I have a pentair pool pump model #SF-N1-1A/340038 and I need a replacement motor for it. The motor number is 3550205 Do you have that part?

A     Answered on 6/28/2017 by InyoPools Product Specialist Lennox H.

Hi. The Century B853 is the direct replacement motor. However, you can use this standard B847 or the energy efficient B661 motor as a replacement. You'll also need the Pentair SuperFlo Tune Up Kit - GOKIT78 when replacing the motor. 

?     Asked on 6/5/2017 by

I have a B846 motor on a 3/4hp pac-fab challenger pump. Can I use a B847 motor since I need a bit more suction for my pool since it needs to be around 60 gmp for my triton tr60 sand filter. It is an old system.

A     Answered on 6/11/2017 by InyoPools Product Specialist Patrick P.

You could upgrade to 3/4 HP but you will need this 3/4 HP Impeller and this 3/4 HP Diffuser.

?     Asked on 6/4/2017 by Dianna

I have a contract on my home and they need me to replace my pool pump motor/impellar/strainer. The pump motor is a Century Centuron B857 34 hp Type CX FN: P56Y. I found the AO Smith B87 34 hp motor that I think will work but I also need the impellar and strainer to go with it. Can you advise what i should order? The label is no longer legible on the impellar or strainer.

A     Answered on 6/9/2017 by InyoPools Product Specialist Lennox H.

Hi, Dianna. I will need the model of the pump housing in order to locate the impeller. If you do not have the model you can upload pictures of the pump housing to upload@inyopools.com.

?     Asked on 5/20/2017 by Ozzy

i have a A.O.Smith pump.....SP3207Z1BE Part 7-196335-24 Serial 257093M...What replacement motor will work with this...Thank You

A     Answered on 5/20/2017 by InyoPools Product Specialist Patrick P.

Hi Ozzy, You would require the HSQ1072 Replacement Motor as a replacement to your SP3207Z1BE motor. You will also need this Hayward Tristar Shaft Seal.

?     Asked on 4/10/2017 by

I just replaced the bearings on my Whisperflo pump because it was making a loud noise. Still same noise. I guess I should replace the motor. Motor part# 0-177449-03. Could you tell me which motor I should get or what else could be the problem? Thank you, Mariska

A     Answered on 4/11/2017 by InyoPools Product Specialist Scott W.

You can either go with the B847, which is the standard 3/4HP full rate motor, or the B661, which is the energy efficient 3/4HP full rate motor. You will want the GOKIT32 as well.

?     Asked on 3/27/2017 by Scott

I have an Emerson EB625 that needs to be replaced. It powers my pool cleaner. Model numberk63cxerd-4771. 3/4 hp sf 1.50. Rpm 3450 volt 230/115. Ha 60 sf amps 6.3/12.6. Ph1 duty cont. mfg MJ04C. Frame 56CZ class B. Therm protected auto. Code L. AMB C. 50. Also booster pumps aren't variable speed are they?

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

The correct replacement motor is part number 3262-18 and the shaft seal is part number 5250-106.

?     Asked on 1/20/2017 by rachel

I need to replace my pool pump motor...I have a B2847....I see you have them...which shaft seal would I need with it? Thanks

A     Answered on 1/24/2017 by InyoPools Product Specialist Alan M.

The motor does not define the shaft seal as this motor is a replacement part on many different pumps. I will need the make and model of your pump to provide the correct shaft seal replacement.

?     Asked on 9/22/2016 by

Hi I have a pentair pumps-n1-3/4a/340037 and motor# 196237, the motor is not working which one should I get? thank you

A     Answered on 9/23/2016 by InyoPools Product Specialist Megan C.

Hello, According to the model #340037 you have a Pentair Superflo 3/4 HP pump. For your reference, here is a link to the Pentair Superflo Parts list. I would recommend you replace your motor with the 3/4 H.P Pool Motor Square Flange 56Y Up Rate (B852, B2852) and replace the shaft seal with the Pump Seal 200 (psr 200) 5/8" or the Tune Up Kit Pentair SuperFlo - GOKIT78 if you need the Shaft Seal plus O-Rings. 

?     Asked on 9/9/2016 by Mike

Is this motor the correct replacement for my motor part # O-177079-04

A     Answered on 9/12/2016 by InyoPools Product Specialist Lennox H.

Hi Mike, Yes, the B847 motor is the correct replacement for p/n 0-177079-04.

?     Asked on 9/8/2016 by mike

this the right replacement motor for my part O-177079-04

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

Yes, that would be the correct replacement motor.

?     Asked on 8/22/2016 by sherry

i have a motor for my pool that is part # 8-168452-03 FR P56Y type CX rpm 3450 volts 230/115 amps 7.1/14.2 please help i need to replace it

A     Answered on 8/24/2016 by InyoPools Product Specialist Scott W.

Do you have a model# for that motor or do you know what model your pump is, because the part# you provided is not pulling anything up for me?

?     Asked on 7/23/2016 by

I need replacement boOster pool pump. Now I have magnetek century centurion B121 part 8 164298 23 H/P 3/4 type cx volts 230/115 amps sf 6.0/12.0 hz 60 Thanks

A     Answered on 7/24/2016 by InyoPools Product Specialist Alex V.

Hello, You can view the B121 motor here: http://www.inyopools.com/Products/07501352022272.htm?Keywords=B121

?     Asked on 7/14/2016 by Tom

Hello! I need a pump motor. My pump model is 38448322, serial number PF-1-26-F02 The motor is A.O. Smith part 7 -177474-01, type cx, FR P56Y, ph1, hz60, rpm3450, 230/115 volts, amps 7.1/14.2, time cont, encl DP, form KJM, code J, insul class B, amb 40 c. Can you also recommend the proper seal kit please? Thank you,

A     Answered on 7/15/2016 by InyoPools Product Specialist Matt S.

Can you provide us the HP and Service Factor (SF) on the motor label, those are one of those most important things we need to double check it is the correct motor. Also, the pump model number PF-1-26-F02 does not cross reference to any pump housing. Can you verify this is the correct number from the pump sticker?

?     Asked on 6/23/2016 by Theodore Patton

what is the replacement options for a HSQ 1072 part #7-196355-24

A     Answered on 6/23/2016 by InyoPools Product Specialist Scott W.

If a Hayward Tristar is what you have then the B847 will fit it. The direct replacement is the HSQ1072 but the B847 will work as well.

?     Asked on 6/21/2016 by jayne e vennitti

i have a magnatek century centurion pool and spa heavy duty motor that needs replaced. which is correct motor?

A     Answered on 6/23/2016 by InyoPools Product Specialist Alan M.

We will need model and specification information located on the motor label to answer your question. It would also be helpful of you have information on the make and model of you pump.

?     Asked on 6/16/2016 by Charles

I have a 3/4 hp A O Smith part #168451.Which pump is replacement?

A     Answered on 6/16/2016 by InyoPools Product Specialist Scott W.

That is the correct replacement for that part number.

?     Asked on 6/12/2016 by

just wanted to know if this is the right replacement motor for a WisperFlo WFE3 before I order it thanks

A     Answered on 6/12/2016 by InyoPools Product Specialist Patrick P.

You would actually need the B2661 3/4 HP Energy Efficient Replacement motor we also suggest a Pentair Whisperflo Tune Up kit when replacing your motor. We do have a Video on How to Replace Pool Pump Motor which you may find helpful.

?     Asked on 5/23/2016 by Mike

Does this motor replace the 0-177894-04

A     Answered on 5/23/2016 by InyoPools Product Specialist Patrick P.

The BN25 Motor is the replacement motor for your 0-177894-04 motor

?     Asked on 5/16/2016 by Peter

I have a century pool and spa motor 1081 part #7-196335-24 is this the same motor?

A     Answered on 5/16/2016 by InyoPools Product Specialist Hector F.

This is not the correct motor. The replacement model is a 5223X.

?     Asked on 5/1/2016 by Ray

I have a Pentair pump model SF-N1-3/4A/346237, what is the replacement pump?

A     Answered on 5/2/2016 by InyoPools Product Specialist Andy O.

Ray- The b847 3/4 HP Standard Motor - Full Rate (B847, B2847) is the incorrect motor. The Correct replacement would be a B852 A.O. Smith 3/4 HP, 56Y Frame, Up-Rate Motor (B852, B2852).

?     Asked on 3/5/2016 by Scott

I have a MagneTek Century Centurion 7-177474-81. Not sure of my HP. INYO POOLS recommends a 3/4 HP Standard Motor - Full Rate B847,B2847. On my label it says my amps are 7.1 14.2. On the recommended moter from INYOPOOLS is 6.6 13.2. Is this a concern? I just want to make sure I get the same HP and the correct motor. The motor I have lasted 16 years.

A     Answered on 3/8/2016 by InyoPools Product Specialist Lennox H.

Hi Scott, The B847 will be the correct replacement motor. The amps is not a big concern other than it will cost you less to operate this motor. We recommend changing the shaft seal and o-rings  when replacing the motor. If you can provide the manufacture and model of your pump housing, we can locate the correct parts for you.

?     Asked on 1/27/2016 by Les

I have a Purex Triton WhisperFlo H.P. Pump that the motor is going out on. I cannot read the Motor HP on the nameplate, but the Part No. is 7-168452-04; Frame:56Y; Form: KJM; Volts: 230/115; Type: OX. Can you tell what replacement motor I need?

A     Answered on 1/27/2016 by InyoPools Product Specialist Megan C.

Hello, Les. You can replace the Pentair / Purex Whisperflo Pump-Motor with A.O. Smith 1 HP, 56Y Frame, Up-Rate PART# B853. Do not forget to   the Tune Up Kit Pentair/Purex Whisperflo PART# GOKIT32 to prevent water leakage. Click here to view the motor, click here to view the GOKIT32, or click here to view the complete parts breakdown of the Pentair / Purex Whisperflo.

?     Asked on 1/9/2016 by John

Pretty sure this is the correct replacement motor - my current motor shows a part #: 7-177079-04. Other than this motor are there any energy efficient motors that would also work as a replacement?

A     Answered on 1/11/2016 by InyoPools Product Specialist Lennox H.

Hi John, The A.O. Smith 3/4 HP EE Full Rate Motor (B661) will be slight more energy efficient than it's standard replacement.

?     Asked on 10/24/2015 by ROB

I have a Pentair Whisper flow WF-24, what is the proper replacement motor and shaft seal kit for it?

A     Answered on 10/26/2015 by InyoPools Product Specialist Lennox H.

Hi Rob, The A.O. Smith 1 HP, 56Y Frame, Up-Rate Motor (B2853) and Pentair/Purex Whisperflo Tune Up Kit (GOKIT32) would be the correct motor and seal kit for the Pentair Whisperflo WF-24 Pump.

?     Asked on 9/6/2015 by Rich

I have a Pentair clean and the motor doesn't work. On the tag or decal of the motor it has model "LA0IN"; the motor details are 3/4HP, 3450 rpm, 230/115 volt, S56CX frame, type CX, Service Factor 1.5 continuous duty, ENCL D.P. Which motor is the correct replacement? Thank you!!!!

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

Hi Rich, The correct replacement motor would be the 3/4 HP Thrd Motor (B668) for the Pentair Booster Pump model LA01N. You would also need to replace the PSR1000 Shaft Seal and the Volute O-ring.

?     Asked on 8/24/2015 by Shannon

I have a pent air challenger with a p/n of 7-168452-04. Sticker on motor says it is a 1hp motor. The equivalent I see here shows a 3/4 hp motor?? What other seals etc will I need to swap out motor?

A     Answered on 8/25/2015 by InyoPools Product Specialist Andy O.

Shannon- The motor model you provided will be replaced by either 3/4 HP Standard Motor - Full Rate (B847, B2847)  or A.O. Smith 1 HP, 56Y Frame, Up-Rate Motor (B2853) would have the same total hp. You can either go with the GOKIT5 which has the o-rings and the shaft seal or you can just get the the shaft seal which is part # 354545s.

?     Asked on 8/6/2015 by erin

does this have a capacitor. my motor is mating a hissing sound the bearings are turning so its not locking up...

A     Answered on 8/7/2015 by InyoPools Product Specialist Matt S.

Hello Erin, this motor does have a capacitor; that "hump" on the back is where it is housed.

?     Asked on 7/15/2015 by Nathan

Does this motor replace 7-177474-01?

A     Answered on 7/15/2015 by InyoPools Product Specialist Hector F.

Yes the B847 is the correct replacement motor.

?     Asked on 6/19/2015 by Kurt

I have a Pentair Whisperflo WFE-3 3/4 horsepower. Which motor is a correct replacement, B2847 or B2661? Thank you.

A     Answered on 6/19/2015 by InyoPools Product Specialist Dennis R.

Hi Kurt,  B2847 is the standard Full rated 3/4 HP motor: B2661 is the Energy Efficient [EE] Full rated 3/4 HP motor - uses 20% less amperage which equates to 20% less in operational costs.

?     Asked on 6/17/2015 by

I have an Pentair Intelliflo VF so what parts would I have to swap out(Impeller, diffuser,kit,) to do a motor replacement with this one please? Also, what is the impeller screw I need for this and is it the same size as the Intelliflo impeller screw? Thx.

A     Answered on 6/19/2015 by InyoPools Product Specialist Lennox H.

You would need to replace the Diffuser Assy. 3/4 - 2 1/2 Hp (072927)Impeller 3/4 Hp Full 1 Hp Up (073127), you can reuse the same Set Screw (071652)  and get a Pentair/Purex Whisperflo Tune Up Kit (GOKIT32) to use with the 3/4 HP Standard-Full Rate Motor.

?     Asked on 6/11/2015 by

does this replace the 7-177449-03 3/4 hp type cx

A     Answered on 6/11/2015 by InyoPools Product Specialist Patrick P.

For the 7-177449-03 you would actually need the B661 (B2661) Replacement Motor.

?     Asked on 2/16/2012 by 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 1/19/2012 by 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 1/12/2012 by 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 1/12/2012 by 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 1/11/2012 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.


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