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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Video

Step by Step

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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.

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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

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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

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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.

Click Here to Find Your Replacement Pool Pump Motor & Gasket Kit

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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Comments

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(1 to 40 of 218)

 Posted: 3/6/2020 

Hello there My pump gave me some trouble now, it keep humming even with a new capacitor. I need to replace it or change just the bearings. Can u tell me link to the kit and the new motor. Thanks Here is the infos on the motor: SN: BY12-08 Part: 7-177452-03 Type: CX FR: Y56Y Hope it will help, thank you so much for your help
 Reply

InyoPools Product Specialist  Posted: 3/9/2020 

When i search the 7-177452-03 part number, the result is the Century 2.0 HP Square Flange 56Y Full Rate EE Motor - B2843. That motor uses two 10000353 bearings. The gasket kit is matched to the pump housing and not the motor. To find the right gasket kit, I will need the model number of the pump housing.
 Reply

 Posted: 1/23/2020 

Hi I need finding a replacement motor Serial BW2-21 Part 187100-02
 Reply

InyoPools Product Specialist  Posted: 1/23/2020 

What is the number before the "187100-02"? For example, the full number would be 07-187100-02 or 10-187100-02
 Reply

 Posted: 12/22/2019 

Hello, I do not find a model number on my motor, but am looking for a replacement for a motor with the following info: CAT: BN37 Serial: BY05-26 Part: 7 -177782-03 HP: --- SF: --- Type: CSM FR: R48Y Any info to help would be appreciate! Thanks!
 Reply

InyoPools Product Specialist  Posted: 12/26/2019 

The catalog(CAT) is equivalent to the model number. The replacement for your motor is the 1 HP Thru-Bolt 48Y Dual Speed Low Amps Motor - BN37V1.
 Reply

Anonymous  Posted: 12/14/2019 

I'm looking a replacement for a Century two speed AO Smith 1 HP. Part#7-K56AA13A04-05 Serial#073123M FR-Y56Y TYPE-CXCP 1081 Pool & Spa Duty. Hope you can help me with a replacement number and where to find it. Thank you.
 Reply

InyoPools Product Specialist  Posted: 12/16/2019 

Hello - I typed your part number into our search and it came back with this result: Hayward TriStar 1 HP Full Rate EE Dual Speed 208-230v Motor - SPX3210Z2BER. Please review the link so you may match the specs listed to your motor's label.
 Reply

 Posted: 11/22/2019 

I have a 16 year old pump for my pool that has limited information on the label. I haven't found a replacement match and was hoping to get some guidance from the experts. Here's what I have...is there a newer version that's a drop in replacement? Century Centurion A.O.Smith Serial: CA10-19 Part: 7 -177452 -03 Type: CX FR: Y56Y HP: 2 SF: 1.3 PH: 1 HZ: 60 RPM: 3450 VOLTS: 208-230 AMPS: 11.0-10.2 Time: CONT ENCL: DP Form: KJM Code: G
 Reply

InyoPools Product Specialist  Posted: 11/25/2019 

The direct replacement motor for your motor part number 7 -177452 -03 is the model B2843. If you need the complete pump that includes the front pump housing then we will need that information as well. If you cannot locate any labels on that end then you can always email us images of that housing to upload@inyopools.com so we can review and further advise. 
 Reply

 Posted: 11/18/2019 

what replacement motor ? for mod.C48J2EB23,HP 3/4,SF 1, FR 48Y,RPM 2850 thank you
 Reply

InyoPools Product Specialist  Posted: 11/19/2019 

Is this motor for a pool or spa? Also, is this installed in the US or overseas? That looks to be a non-standard RPM. What is the HZ. 50 or 60?
 Reply

 Posted: 11/9/2019 

I search for replacement pump based on my current model # k63cxfgw-5043; HP 1.5; sf 1.60; fr 56J; but you’re site doesn’t come back with a full rated pump only the up rated pump. Can you please tell me how to get the correct pump that I need. Thank you.
 Reply

InyoPools Product Specialist  Posted: 11/11/2019 

Your replacement motor is the 1.5 HP Full Rate NorthStar Replacement Motor - SN1152.
 Reply

 Posted: 10/10/2019 

Hi there, what spa water heater pump can I replace my old one? It is an AO Smith part number 0-187694-01
 Reply

InyoPools Product Specialist  Posted: 10/10/2019 

Hello - when I put the number 0-187694-01 in the search box at the top of the page, the 3 HP Thru-Bolt 56Y Dual Speed 230V Motor - B2234 is the only result. Does the horsepower, volts, amps, and frame match your current motor's ratings?
 Reply

 Posted: 7/30/2019 

Just replaced my motor but it seems like it is running slower than normal. Water is flowing but not fast enough. What's up?
 Reply

InyoPools Product Specialist  Posted: 8/1/2019 

There are several reasons why the water flow could be slower. There could be an air leak, a dirty filter, full basket, or a clogged impeller.
 Reply

Anonymous  Posted: 7/30/2019 

Hello, trying to find a replacement motor for an AO Smith/century centurion. Label is barely legible, but part numbers are B228SE, 7-184981-23, m3450. It has a square front on it not a round one. I have pictures I can email. Thank you
 Reply

InyoPools Product Specialist  Posted: 7/30/2019 

The B228SE - 1 HP 56J Up Rate is definitely a round flange motor. I think you may be confusing the seal plate, which is a part of the pump, for the motor flange.
 Reply

Anonymous  Posted: 8/7/2019 

Ok, thank you. You are probably right about confusing the two, so is the motor a c faced one? That’s what comes up when putting in part number. Thank you
 Reply

InyoPools Product Specialist  Posted: 8/7/2019 

It is a Round Flange, which can be listed under the Frame (FR) rating of the motor label as a J or a C. If you would like a more thorough explanation, I would give this a read: What Does My Pump Motor’s Frame (FR) Rating Mean?
 Reply

 Posted: 7/20/2019 

Hi, am looking to replace a 1081 Pool Pump Duty mount horiz with vent holes down, AO Smith, Serial: 04607CH, Part: O-173840-23; Type:CS; Frame:N56CZ; H/P:3/4; SF:1.50; PH: 1; HZ:60; RPM:3450; Volts: 230/115 - can you please help confirm which option is the right one? Thanks
 Reply

InyoPools Product Specialist  Posted: 7/22/2019 

The correct par number is the 0-173840-23, and its replacement is the Booster Pump Motor - B625
 Reply

 Posted: 7/19/2019 

Looking to replace my 20 year old pump. Its a 2 speed AO Smith model c48L2p104. or u27-891. 1 1/2 HP. frame is 48y. It also says Sta-rite Dura-Glas H/L. Could you please tell me what the replacement would be. Thank You!
 Reply

InyoPools Product Specialist  Posted: 7/19/2019 

I entered the c48L2p104 enter our search at the top of the screen, and the result was the SQS1102R Fullrate Dual Speed.  Your current motor is likely a 1-HP uprated, whereas this is a 1-HP fullrated they are equal in total HP.
 Reply

 Posted: 7/16/2019 

I have a dual speed AO Smith pool pump. The model number is C48K2N. It’s 230 V but the Amps are not clear. What is the amp rating?
 Reply

InyoPools Product Specialist  Posted: 7/17/2019 

The C48K2N is a partial model number, we are not able to identify the motor with it. We need the full number.
 Reply

 Posted: 7/16/2019 

What is the approximate gallon per minute on the low speed for your 1 hp AO Smith Green 2 speed pump?
 Reply

InyoPools Product Specialist  Posted: 7/17/2019 

The gallons per minute is determined by the pump end, and not solely on the motor. A 1 HP motor can be fitted to dozens of pump housings which have various flow rates. Plus you would also need to know the feet of head of the plumbing system to calculate the flow rate.
 Reply

 Posted: 7/9/2019 

Help. Need jacuzzi a o Smith 3/4 motor w repar kit. (1.25 sf). Part 7- 1849447-22, type cx, volts 230/215, amps 4.4/8.8, rpm 3450, pr fx6j, amb 50 C, form kjm, insulation class b, hz 60, code n, 1081 pool pump duty mount horiz w vent holes down, serial byo2-03, encl dp, need repair kit also. Pump is 12 yrs old?. Do u have replacement motor? Ty
 Reply

InyoPools Product Specialist  Posted: 7/9/2019 

There are too many digits in the 7- 1849447-22, can you verify the number?
 Reply

 Posted: 7/9/2019 

Sorry. 7-184947-22. That was a quick response. Ty I want to switch out motor only, +kit. Is this possible?
 Reply

InyoPools Product Specialist  Posted: 7/9/2019 

The replacement motor is the UST1072.The seals are matched to a pump housing instead of the motor. What is the model number of the pump housing this motor is bolting to? 
 Reply

 Posted: 7/9/2019 

Wow. Ur response time is remarkable! Been on phone for days w pool stores, ugh. Serial# 344452000061, 7umf-s, 94027107. Thanks for ur dedication.
 Reply

InyoPools Product Specialist  Posted: 7/10/2019 

The replacement motor for the Jacuzzi Magnum 3/4 HP is the UST1072
 Reply

 Posted: 7/10/2019 

What about kit pls. Thx
 Reply

InyoPools Product Specialist  Posted: 7/10/2019 

Tune Up Kit Carvin/Jacuzzi Magnum Series - GOKIT14
 Reply

 Posted: 7/8/2019 

I am looking for a replacement of Century two speed A.O.Smith serial# BZ05-19, part# 7-177143-03, type CXPM, FR Y56Y, PH 1, 60Hz, RPM 3450/17/25, Amps SF 14.6/4.7. Which one I can order?
 Reply

InyoPools Product Specialist  Posted: 7/9/2019 

Hello - the replacement motor is the Square Flange 56Y Dual Speed Full Rate Motor - B2981.
 Reply