Century 1.5 HP Round Flange 56J Dual Speed Full Rate Motor - B2977



Part # 5388X

By Century Motors

  4.86 Average  



Part # 5388X

Warranty 1 Year

Manufacturer Code B2977

Dimensions 15" L x 5.5" W x 8" D

Alternate Part #'s 10-177062-03, 1105200403, 152686, 158226, 158567, 15940, 159818, 159944, 1615Z-2-MC, 1615Z-2-MSC, 165978, 177062, 177103, 177107, 177108, 177242, 190040, 190047, 190066, 190095, 190114, 190125, 190146, 190147, 190161, 190190, 193636, 35B1199, 5KCR48SN3015X, 7-177062-05, 7-193636-05, 8-177062-03, 8-177062-05, 8-177103-02, 8-177107-04, 8-190114-01, 817706205, A0564700, B927, B957, B977, C1112, CT115T, EB977, EB977., MGT605117, SP-1615-Z2-MC, SP-1615-Z2-MSC, SP4010X152, STS1152R

Product Description

Century 1.5 HP Round Flange 56J Dual Speed Full Rate Motor - B2977


Motor Dimensions Motor Dimensions
Motor Image Motor Image

Product Specifications

Motor Name:
1.5 HP B977 Replacement Pool Motor
1.5/ .2 HP
3450/1725 RPM
230 V
8.9/3.1 amp
Service Factor:
Total HP:
1.95 HP
Stock #:
Overload Protector:
Dimension Letter:
13.05 in.
California Title 20 Compliant

?     Asked on 6/9/2019 by scott shelton

Is this replacement motor for hayward model sp4010x152NS which seems to be obsolete now.

A  Answered on 6/9/2019 by InyoPools Product Specialist Patrick P.

Hi Scott, This motor on this page is not the proper replacement motor for your Northstar. You will need this 1.5 HP Dual Speed Northstar Replacement Motor - SPX1610Z2MNS we do currently have this motor in stock ready to ship.

?     Asked on 7/2/2018 by

Hi, replacing pump motor SP -1615- z2- mc. The unit I have states 2 hp and this one appears to be 1.5 hp? Is there a model change since I replaced the last time?

A  Answered on 7/2/2018 by InyoPools Product Specialist Lennox H.

Hi. This B2977 is a 1.5 HP Full Rate motor. It has a service factor of 1.3, when you multiply the 1.5 HP x 1.3 SF = 1.95 THP. The motor rating is different, however, the operating performance is not different.

?     Asked on 5/22/2018 by Ronan Ryan

I bought this motor from INYO to replace B977. All is OK except the terminal box cover is a different design and appears not to be compatible with the hi/lo switch which you recommend, P/N 5271-75 (17590450). The new terminal box cover is plastic. The old design was metal and had a hatch that could be replaced with the hi-lo switch assembly. I am currently using the motor in single speed mode. Do you have a suggested solution for this problem?

A  Answered on 5/26/2018 by InyoPools Product Specialist Lennox H.

Hi, Ronan. Century had a motor design change. You will need the Toggle Switch and Canopy Kit - 2512558-001. A return will be set up so that you return Part #17590450. You will have to purchase the Toggle Switch and Canopy Kit - 2512558-001

?     Asked on 4/29/2018 by BYRON

this is the exact replacement for the pump I have, but since I can't find anyone who can hook it up to the timer box to run two-speed, is there an exact one-speed alternative?

A  Answered on 5/1/2018 by InyoPools Product Specialist Hector F.

Yes, the model of this same motor in the single speed version is 5223X

?     Asked on 8/31/2017 by Steve

Will this work with a Hayward Super II housing ? What is the advantage of the newer STS1152r motor over this model?

A  Answered on 8/31/2017 by InyoPools Product Specialist Lennox H.

Hi, Steve. Yes, this B977 motor will fit the Hayward Super II Pump housing. The physical dimensions are the difference between the two motors.

?     Asked on 11/11/2016 by Fadi

Is the B2977 motor interchangeable with the STS 1152R? The only difference I found is the lower speed horse power, 0.2 hp compared to 0.25 for the STS. The B2977 seems to be a newer model. I have Hayward pump SP4010X152 and need to replace the motor. Thanks

A  Answered on 11/11/2016 by InyoPools Product Specialist Scott W.

This two motor are going to be the same, the STS1152R is just going to be the newer model.

?     Asked on 9/16/2016 by Bill

Motor not starting on high speed. Starts on low, then high from running on low. Capacitor replacement or motor winding at fault?

A  Answered on 9/30/2016 by InyoPools Product Specialist Lennox H.

Hi, Bill. The reasons you've listed can lead to the problem that you're having. You can take the motor to a shop so that it can be tested to confirm which one is the culprit.

?     Asked on 8/9/2016 by Mark Hoffman

I have this exact motor, what pump do I need for it?

A  Answered on 8/10/2016 by InyoPools Product Specialist Alan M.

This motor can fit a number of different pump housings. I would need information on the pump you currently have to better assist you.

?     Asked on 6/8/2016 by Robert

I need the pump tune up kit that goes with my pump. All info if gone from the case. The motor is a AO Smith B977,56J frame. The pump has 2" inlet and discharge. The case seal fits into a circular groove. Thank you for any help, Robert

A  Answered on 6/9/2016 by InyoPools Product Specialist Scott W.

Unfortunately I'd need the model of the pump to find the correct seal kit for your pump.

?     Asked on 8/9/2015 by

I want to confirm the replacement motor for AO Smith SP1615-Z-2-BC 2 speed 1.5 - 2 HP. Do I need a tune up kit?

A  Answered on 8/11/2015 by InyoPools Product Specialist Patrick P.

We would strongly recommend a Tune Up Kit when replacing your motor. You would just need to know which manufacture and model of pump you have, you should be able to find your Tune Up Kit on your Tune Up Kit Page.

?     Asked on 6/19/2015 by jill

I just ordered this replacement motor. Does it come with toggle switch & cover? if not could you tell me which switch to get?

A  Answered on 6/20/2015 by InyoPools Product Specialist Lennox H.

The 1.5 HP 56J Thrd Full Rate Motor does not come with a toggle switch and cover, you will need the 2 Speed Toggle Switch (79129900).

?     Asked on 4/24/2015 by Al

I am replacing my motor in my Hayward SP4010x152NS. Have I selected the correct motor ? Thanks

A  Answered on 4/24/2015 by InyoPools Product Specialist Robert M.

Hello Al - The correct replacement motor is model SPX1610Z2MNS.

?     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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