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How To Replace AO Smith Motor Parts - Overview

WRITTEN BY: Inyo Pools

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This guide provides an overview of the A.O. Smith motor parts that you can replace on the electrical end of your motor. This picture shows the electrical parts with the electrical cover off. Instructions for replacing each of these parts are referenced after the part description.

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Step by Step

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Step 1

VIEWS PARTS - This picture identifies the replaceable electrical parts on a common A.O. Smith motor. Not all the A.O Smith motors will have all these parts but they are common to most of their motors.

Step 2

CAPACITOR - This Capacitor, referred to as a Start Capacitor, is tied directly to the Start Winding. This Capacitor together with the Start Windings provides an increase of 150 -175 % of torque to the motor shaft during its initial startup. When the motor reaches 2/3 to 3/4 full speed after a few seconds of operation, the start circuit will shut off. The start capacitor will generally be rated at 50-400 MFD and 125 or 250 VAC. If your motor won't start and hums when you try to turn it on, you probably have a bad Start Capacitor. For instruction on replacing this part see our guide on "How To Replace a Pool Pump Capacitor".

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Step 3

STATIONARY SWITCH - The Stationary Switch or Start Switch is commonly shaped as a V with contacts at the point of the V. When the motor is at rest, the contacts are pushed together by the Governor and the start circuit is closed ready to give the motor an extra boost to get started. If the contact points don't line up correctly, you may have to replace them. For instructions on replacing this part see our guide on "How To Replace the Start Switch on an AO Smith Motor".

Step 4

GOVERNOR - The governor controls the opening and closing of the start switch. When the motor is off, springs on the arm of the governor cause the arm to come in contact with the bottom of the start switch causing the two contact points on the switch to come together and close the start winding circuit. When the motor is turned on, the rotational force of the shaft causes the weights on the ends of the governor to spin out. When that rotational force is greater than the force of the springs, the arm on the governor drops down and the contacts on the switch separate and disconnect the start capacitor circuit. With age, the governor will sometimes stick open so that when the motor shuts off, the start circuit will remain open and the motor will not restart. For instructions on replacing the Governor see our guide on "How To Replace the Governor on an AO Smith Motor".

Step 5

TERMINAL BOARD - The Terminal Board provides contact points to connect wires your outside power source to the motor. If this Board is damaged you may have to replace it. For instructions on replacing the Terminal Board see our guide on "How To Replace the Terminal Board on an AO Smith Motor".

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Step 6

TERMINAL OVERLOAD PROTECTOR - The Thermal Overload Protector helps keep the motor from overheating. When the motor amperage exceeds max amps, the motor will overheat, and the Overload will shut the motor off until it cools. If the motor keeps cycling on and off, you either have a defective Overload or some other problem with the motor. To replace the Thermal Overload Protector see our guide on "How To Replace the Thermal Overload Protector on an AO Smith Motor".

Step 7

BEARINGS - With age or water damage the bearings in your motor may become worn or damaged to the point where start to screech. With the right tools, you can replace these bearings yourself. For replacement instructions see our guides on "How To Replace the Bearings in a Pool Pump Motor - Part I" and "How To Replace the Bearings in a Pool Pump Motor - Part II".

Step 8

COOLING FAN - A cooling fan is attached to the shaft of the motor to help cool the motor during operation. The fan is mounted just behind the front motor bearing. Occasionally the blades of the fan will be damaged and will need to be replaced. For instructions on replacing this fan see our guide on "How To Replace the Cooling Fan on an AO Smith Motor" (In process).

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Comments

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(1 to 40 of 81)

Anonymous Posted: 6/16/2022

Looking for motor bearings for a sta-rite (AO Smith) 1.5hp pump motor. Label mentions motor # 168453.
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InyoPools Product Specialist Matt S. Posted: 6/30/2022

The correct run capacitor for the 168453 pool pump motor is the 30 MFD (5VR0303) (2444)
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Anonymous Posted: 5/22/2022

Good evening. What would be the correct bearing set for an AO Smith S48J2A4A8 (1/2 HP) motor?
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Paul.Burns Posted: 8/21/2022

NSK.6203 Z Measurements ID17mm, OD40mm, width12mm
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InyoPools Product Specialist Matt S. Posted: 8/30/2022

This would be the replacement Ball Bearing Double Sealed (6203-625)
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InyoPools Product Specialist Matt S. Posted: 5/23/2022

The S48J2A4A8 (BN23V1) motor uses two of the 10000353 bearings.
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Anonymous Posted: 5/27/2022

Thank you!
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InyoPools Product Specialist Matt S. Posted: 6/2/2022

You're welcome!
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Bryan Jones Posted: 11/7/2021

Can you give me info on an older jacuzzu bathtub motor? The info on the motor is: A.O. Smith, S#F48R32B13, SER2105, RPM 3450, FR 56Z, TYPE F. Is there an exact replacement motor? What is a comparable motor that you suggest? And if I decide to pull the air pressure switch off can you tell me which one I need for this motor without looking at it. Thanks.
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InyoPools Product Specialist Matt S. Posted: 11/10/2021

That motor does not cross-reference to anything in our system. That F48R32B13 motor appears to be a small batch motor meant for a specific pump model. Do you have the model number of the pump housing? You may need to find a dealer that specializes in bathtub goods, as we don't have too much material on those types of pumps.
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Anonymous Posted: 8/25/2021

I have a century vgreen 165 with broken cooling fan blades. How can I find a replacement fan?
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InyoPools Product Specialist Matt S. Posted: 8/25/2021

Unfortunately, the V-Green's cooling fan is not currently available as a replacement part.
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Clifford Posted: 10/10/2020

We are looking for a direct replacement for our TEEL #3P686 water pump (Grainger 2009c), using an A.O. Smith motor #C48K2EC15 (1 HP; 0.75KW, 115/230V; 60Hz). Replacement motor: Dayton #1D189 (using a flange that mates with the Teel #3P686 pump assembly). Are you familiar with this motor and/or do you have a replacement?
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InyoPools Product Specialist Matt S. Posted: 10/22/2020

The C48K2EC15 cross-references to the Century 1.0 HP Square Flange 48Y Up Rate Motor - USQ1102
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M.V. Andrade Posted: 10/8/2020

I need to replace the fan on an ao smith pump motor. Do you have instructions or a schematic of the motor and fan? Thank you.
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InyoPools Product Specialist Matt S. Posted: 10/19/2020

What is the part, model, or catalog number on your motor's label? A picture of the motor label would be most helpful.
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Mario Andrsde Posted: 10/19/2020

Thanks Matt, I found someone who could do the job better than I could. It was done on a matter of a couple of hours. Regards.
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InyoPools Product Specialist Matt S. Posted: 10/19/2020

That's cool; the important part is that the job got done.
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Michael Smith Posted: 8/27/2020

Have you developed the procedure to replace the cooling fan on an AO Smith motor. My fan has a crack on the hub and the armature shaft is rusty. I know I'll have to remove the rust as step one.
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InyoPools Product Specialist Matt S. Posted: 8/27/2020

We do not have a guide on that just yet, but that is on our ever-growing list of content. We hope to produce these guides in the offseason.
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Andy Posted: 8/2/2020

Hi after a replacement fan for my A O smith motor 1081/1563 and struggling to find one
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InyoPools Product Specialist Matt S. Posted: 8/21/2020

The 1081/1563 notes the type of motor it is, but it does not identify that specific motor. We would need the motor's part, catalog, or model number.
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Marcel Posted: 7/29/2020

J'ai un moteur A.O.Smith Cat:P140 Serial:BY03-27 Part: 8 -186406 -40 FR:Y184JM HP. 5 RPM:3450 Volts 230 AMPs: 20 Je voudrais avoir le condensateur run .Quelqu'un pourrais me dire le numéro de cette pièces et ou je pourrais le trouvé ou combien ca prend de mega farad Merci
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InyoPools Product Specialist Matt S. Posted: 9/1/2020

I had to use google translate, but I think you are looking for a run capacitor. I tried searching for that motor part number bu nothing cross-references to it. Can you provide me the microfarad rating on the capacitor's shell?
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Eld Posted: 6/21/2020

Hi, I need to replace the AO smith electric motor MOD JE1E0228N/ HC27CB118. Is that avalibale
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InyoPools Product Specialist Matt S. Posted: 9/2/2020

Is this for a pool pump? The format of those numbers do not match the part, catalog, or model numbers of a 1081 type.
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Zach Posted: 3/14/2020

I need replacement bearings for my century centurion B2853, where can I find them?
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InyoPools Product Specialist Matt S. Posted: 3/16/2020

Hello - the B853 Century Motor uses two of the 203 Bearing
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Robert Posted: 1/1/2020

Hello. I have a Pentair #177452 2.0 HP motor that needs both bearings. Can you tell me the part numbers, price and if you have any in stock? thanks.
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InyoPools Product Specialist Robert M. Posted: 1/2/2020

Hello Robert - Your motor would require two 6203 bearings. Click Here to view the pricing and part number.
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Eddie Posted: 11/16/2019

Hello. I have an a.o smith motor model c48a95a06 and was wondering what bearings it takes and if you have them? Thanks
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InyoPools Product Specialist Hector F. Posted: 11/18/2019

Your motor model uses two of the bearing part number 5270-31.
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Michael Posted: 11/5/2019

Hi, Hi there.. I have a 2 speed motor by AO Smith - part 7-k56aa13a04-05. Which capacitor(s) would I need for this one?
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InyoPools Product Specialist Matt S. Posted: 11/5/2019

Your Tri-Star motor requires the Run Capacitor, 30 MFD (5VR0303) (2444)
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Ralph Hesson Posted: 8/11/2019

I have a 2 HP AO Smith motor on my pool pump. The motors part number is O-193987-24, SN30510CH. What bearings do I need?
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InyoPools Product Specialist Matt S. Posted: 8/14/2019

That motor requires one 304 Ntn-6304-ll (6304) and one 203 (62032rs).
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Jeffrey Juliano Posted: 7/17/2019

Does the 1hp and 1.5hp motor take same capacitor? I need a capacitor for a 1hp so Smith motor
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InyoPools Product Specialist Matt S. Posted: 7/18/2019

It most likely does, but we need to identify the motor model or part number to figure out which capacitor it takes. For an example of these numbers, look at any of the previous comments.
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Butch Posted: 7/10/2019

I have a A.O. Smith 2-speed ac motor model: SV2074 / s/n: S56B06A01 I need a new terminal board assembly #631547-002 Please help me locate one... Butch
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InyoPools Product Specialist Matt S. Posted: 7/11/2019

That part number is not listed in our system, our distributor's or even Google. I don't think that is a valid number any longer.
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