How to Read an AO Smith Pool Motor Label

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When the time comes to replace your pool pump motor the jumble of numbers and ratings on a motor can be overwhelming. This "How to" will guide you through which information is useful in your replacement pump motor search. We also provide tips on essential parts that should be replaced when installing a new pump motor.

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Step 1

Tools you may need: 1. A cloth and cleaning solution, this is needed to remove any dirt or grime causing your pump motor label to be unreadable 2. A Shaft Seal or GOKIT when replacing your motor. Working seals and gaskets are vital to the health of your pool pump. A malfunctioning shaft seal will cause water from the pump to leak into your electrical motor causing it to fail prematurely. A GOKIT includes the complete set of your pumps gasket's and O-rings, including the shaft seal.

Step 2

In general there are two main labels on a pool pump; the pump label and pump motor label. Both can be used to determine the correct motor replacement but first we will focus on the motor label as it is the quickest and easiest to search. If your motor label is unreadable, later in the guide we will show you how to backtrack information off your pump to find the correct replacement. Quick Tip: The manufacturer of the pump motor and the pump itself are different companies even if the pump is brand new from the factory. For example, you have purchased a Hayward Super Pump, the wet end of pump where the water is housed is made by Hayward. The motor attached to that pump wet end was likely made by A.O. Smith, Century or Marathon.

Step 3

An A.O. Smith pump motor label has a lot of different numbers and ratings that can have an appearance of alphabet soup at first glance. Let's narrow down the scope to just the information we will need to search for a new pool pump motor replacement. The list is as follows: Motor Model Number, Horsepower (HP), Service Factor (SF) and Frame (FR)

Step 4

When reading an A.O. Smith pump motor label the most pertinent information to aid you in finding a replacement is the "Motor Model Number." With this information alone you could find the exact match. As shown in the picture, an A.O. Smith motor may have two model number formats listed, either one can be used in INYO's pool pump motor search engine.

Step 5

The first format is one that follows the line of "UST1102", "ST1102" or "SN1102". The set of letters in the beginning denote the service factor rating of the pump. The "UST-" stands for an uprated motor and "ST-" means it is a full rated. The last four digits show its HP: "-1102" = 1 HP, "-1152" = 1.5 HP, "-1202" = 2 HP and so on. Type complete number (ex. UST1102) into INYO's product search at the upper right-hand portion of our site to find pool pump motor match

Step 6

The second format of pump model numbers contains a prefix that is most commonly "C48", "C56", "K48" or "K56". This prefix is followed by four to nine letters and numbers which identify the specific motor. Type this entire number into INYO's product search to find the correct pump motor match. An example of this pump model number format: C48L2N134C1

Step 7

If the Motor's model number is unavailable then we will have to use a combination of the pump label information and other available info on the motor label. The information needed off the motor label is the Horsepower (HP), Service Factor (SF) and Frame (FR).

Step 8

In most cases the Pump's manufacture label is located near the outlet port, location may vary depending upon the maker.

Step 9

On the pool pump label there should be two numbers listed, the serial and model. The pump model number can be entered into our product search engine; the result should provide the make, model and horsepower. Copy down this information and enter our pump motors section by selecting it in our “Shop by Category” sidebar.

Step 10

In the Pump Motors section you will be asked for the manufacturer then the model. Your specific model may have two categories that list by your pump motor's service factor (SF). The motor's SF is listed on the label, this number will be in the range of 1.00 - 1.95. A SF of 1.00 to 1.27 is listed as an Up rated, anything over is Full rated. Please be sure you match the Service Factor of your pump as failure to do so will cause incompatibility between your current pump and new replacement motor.

Step 11

After checking all the previous information and have found a possible correct replacement, your last piece of info to check will be the Frame (FR). Most motors have a frame of "48Y", "56Y", "48J" or "56J". If your prospective replacement matches HP, SF, and FR then you have successfully found your motor replacement.

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(1 to 40 of 172)

 Posted: 6/23/2019  Latest

Hi, I have AO smith pool motor as i need chang,the is BN 55 ,2 speed ,se 1.0, 230 v , PRM is 2850/1425 . FR Y 48Y seri nummer BT 7-23 ,amper 9,2-8.8/3.0.3.3 . I have to nummer 186364-02 . Pleas can you help me to fin right pump? Thans, Mo
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InyoPools Product Specialist  Posted: 6/25/2019  Latest

This appears to be a 50 HZ motor for international use, unfortunately, we do not carry the 50 HZ version of this motor only the 60 HZ model designed for use in the USA.
 Reply

 Posted: 6/19/2019  Latest

I need to replace my pump A.O.Smith serial BY01-27 type CX fr M56J hp 1
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InyoPools Product Specialist  Posted: 6/19/2019  Latest

What is the catalog or part number from your motor's label?
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 Posted: 6/19/2019  Latest

Part 7-193632-23
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InyoPools Product Specialist  Posted: 6/19/2019  Latest

The replacement motor would be the 1 HP Round Flange 56J Full Rate EE Motor - B128.
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 Posted: 6/18/2019 

Hi, I'm looking for a replacement motor for part 7-184948-22, 1 HP, RPM 3450,FR - X56J, type cx, assembled in Mexico.
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InyoPools Product Specialist  Posted: 6/19/2019  Latest

Hello - the replacement motor would be the 1 HP Round Flange 56J Full Rate Motor - ST1102
 Reply

 Posted: 6/2/2019 

AO SMITH HAYWARD SUPER PUMP MODEL # C48K2N143B1 -- SER # 01309CH CAN YOU TELL ME THE MANUFACTURE DATE?
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InyoPools Product Specialist  Posted: 6/6/2019 

Only the manufacturer can ID motors using the serial number.
 Reply

 Posted: 5/27/2019 

Hello need a replacement for a century centurion pump mod# 175367 Thanks!
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InyoPools Product Specialist  Posted: 5/28/2019 

There should be at least one digit and two digits after the 175367 part number.
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 Posted: 5/28/2019 

Need pump replacement for part# 7-193986-24 Thanks
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InyoPools Product Specialist  Posted: 5/30/2019 

What is the listed horsepower of your motor?
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 Posted: 5/21/2019 

AO SMith Century Centurion part 7-177474-01
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InyoPools Product Specialist  Posted: 5/21/2019 

Are you looking for a replacement motor or other information?
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 Posted: 5/20/2019 

Looking for a "drop-in" replacement for a pump and motor. Hayward Self Priming Super Pump motor SP-1610-Z-2-M. C48L2N125
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InyoPools Product Specialist  Posted: 5/20/2019 

The replacement motor for your C48L2N125 is the STS1152R. The gasket kit to complete the motor installation is the GOKIT3 or the GOKIT3SALT for salt pools.
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 Posted: 5/19/2019 

My elderly parents are needing to replace an old Hayward AO Smith model C48M2N111A3 2 HP SF 1.0 Frame 56i Help me please! Also, the other piece SP 3916 C
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InyoPools Product Specialist  Posted: 5/20/2019 

The replacement 2HP motor is the UST1202. Do you need help finding the shaft seal to complete the motor replacement? If so, we will need the model number of the pump housing or a picture of the housing. The SP3916C number is not a valid model number or part number.
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 Posted: 5/9/2019 

I have an Namco pool that is 20 years old. I am looking to replace motor and platform it stands on. It is a A.O.Smith HP 1.5 SPL ( 2 SPD), serial 281073M, part 7-181327-03. 115 volts , 12.0/3.1. type CSM , FR R48Y. I have the Proline d.e. Filter. ** photos if needed Thanks, Mike
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InyoPools Product Specialist  Posted: 5/10/2019 

Hello Michael - The replacement motor for your pool pump is the 1 HP Thru-Bolt 48Y Dual Speed Low Amps Motor - BN37V1. You'll notice the replacement is a 1 HP, while your original is a 1.5 SPL. The SPL stands for special; which means the listed horsepower is inflated. This tactic is used by spa pump manufacturers to make their unit seem more powerful than they actually are.
 Reply

 Posted: 5/8/2019 

I need to know what we replace model C 48K2N143B1. HP1.
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InyoPools Product Specialist  Posted: 5/8/2019 

Hello Dennis - the replacement motor for your pump is the UST1102, 1-HP 56J-Frame
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Anonymous  Posted: 5/1/2019 

Hi, what is the model number for this pool my pool pump with a serial number of 04611CH? Thank you
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InyoPools Product Specialist  Posted: 5/2/2019 

Unfortunately, a matching motor replacement cannot be found using a serial number. But if you can provide the Part, Catalog (CAT), or Model (MOD) number we can track it down.
 Reply

 Posted: 4/26/2019 

I am trying to figure out how old my pump is. Can you help? Part 7-168452-04.
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InyoPools Product Specialist  Posted: 4/29/2019 

The replacement motor is the B2853
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 Posted: 4/21/2019 

What replaces the a.o. smith 1.5 hp serial# BZ08-24, Part# 7-177216-24 Type: CX Frame: Y56Y, SF 1.10 PH: 1, HZ: 60, RPM: 3450 1081 Pool pump duty mount horizontal with vent holes down
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InyoPools Product Specialist  Posted: 4/23/2019 

Hello Michael - The replacement for your motor is Century model B2854.
 Reply

 Posted: 4/17/2019 

I have a magnetek century pump no model number but the SF is 1.0 HP is 2.0 FR Y56Y RPM is 3450 serial is B85-F40357. Part says 8-165200-40 I need a new impeller according to my local pool company but they want to hit me $300 for parts and labor. Can anyone help
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InyoPools Product Specialist  Posted: 4/18/2019 

Hello Andrew - The replacement motor is part number B2842. The impeller will depend on your pump model. What is the make and model of your pump?
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 Posted: 5/2/2019 

The model # is faded I can only read the serial number JS46324AP there was also a sticker that said Ultra-Flow if that's any help
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InyoPools Product Specialist  Posted: 5/3/2019 

The Ultra Flo impeller for the B2842 motor is part number 5106-233.
 Reply

 Posted: 5/18/2019 

Great! Do I need anything else when replacing it like a wear seal and what's the replacement numbers for the new gasket and ceramic?
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InyoPools Product Specialist  Posted: 5/20/2019 

We'd recommend replacing the seals when you replace the motor. The seal kit is part number GOKIT20.
 Reply

 Posted: 12/7/2018 

My 20A double pole circuit breaker trips if I try to turn on the pump. My motor is probably 12 years old and had the bearings replaced 2 years ago. The plate reads: A.O. Smith Serial BX9-30 Part: 7-177450-03 Type CX FR Y56Y RPM 3450 Volts 208-230/115 AMPS 7.8-7.4/14.8 TIME: CONT ENCL: DP From: KJM Code:J 1081 Pool pump Duty Mount Horiz with vent holes down 71314 Pump plate says WhisperFlo Model NO. WFE-4, Service Factor 1.65 Serial No. 1-27-102 How do I troubleshoot it? If it's the motor, which model should it be replaced with?
 Reply

InyoPools Product Specialist  Posted: 12/10/2018 

Hello Malcolm - as we show in the article, there are a few things you list in your question that will find the correct replacement motor in our site's search; for example 7-177450-03, or the combination of HP, Service Factor, and Frame to narrow the candidates.  The correct motor replacement is the B2841 1-HP EE motor.We also have a few guides that can help with your pool pump motor tripping a breaker issue.
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 Posted: 10/8/2018 

My A.O. Smith B128 attached to my spx 2607x10 bit the dust the other day. In looking for a replacement motor, it seemed that the A.O. smith UST 1102 was actually the better option. It looks like the B128 has a service factor of 1.4 and UST has a service factor of 1.1. I have 1.5 inch lines running into the spx 2607X10 so I am limited to 60 GPM anyways. So I guess my question is, will there be a measurable flow difference from the 0.3 HP difference in motors?
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InyoPools Product Specialist  Posted: 10/10/2018 

Hello Adam - thanks for the question. There will be no difference because the water flow is limited by the impeller. If you paired a 3 horsepower motor with a 1 HP impeller, the pump would only be able to draw and push 1 HP worth of water.The only advantage to the B128 is that it is slightly more energy efficient. Comparing the tags, the B128 uses 14.4 amps on 115 voltage, to the UST1102's 15 amps.
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