What is Service Factor?
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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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Why do I need to purchase a new shaft seal?
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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.
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Why should I purchase a Tune Up Kit?
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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.
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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?
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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.
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My pump makes a loud high pitched screaming noise when running. The pump moves the water well but the noise is very loud. Would replacing the seals eliminate my noise problem?
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How warm/hot to the touch should the motor feel after it has been running for a few hours...? The average outside air temp while the motor is running is 85 degrees F.
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Rick, generally motors have a rating on them It will say AMB. It could, for example, say 50 Degress C, which means it will operate at 122 degrees F ABOVE the ambient temperature. Easily a motor can feel 200 degrees.
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I run my pump year round about 8-12 hours per day using the 1.5 HP full rate motor....should the pump motor be lasting more than a year or 2?
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The pump motors should last more than a year or two. Make sure you replace the seals when you replace the motor. Check out our guide on "How to Extend the Life of Your Swimming Pool Motor".
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Pump is on a timer. The motor will try to start, but only hum and either eventually automatically shut off (and then retry to start until it throws a breaker), if I re-set breaker, it will then at some point actually work until it is time for it to shut down. If you touch the pump motor while it is running it is VERY HOT!!!......should I just be getting a new motor?
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Yes based on what you are explaining I would suggest replacing your entire motor, especially since the motor is running so hot as this may have caused other damage to parts within the motor.
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I have a Hayward RS1500 pool pump that the motor (K48m2n110) is going out on. I am unsure if this is the Hayward Super II motor but believe it is. It looks as though the replacement motor is the ST1152. I am looking for the go kit that I would need when replacing this motor.
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Hi, The A.O. Smith Round Flange 1 1/2 HP Full Rate Motor (C1101, ST1152) would be the correct motor for the Hayward RS1500 Pump, The Hayward Super II Tune Up Kit (GOKIT2) is the correct gokit can can also be used on the Hayward RS1500 Pump.
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What is the correct start capacitor for the AO Smith ST 1152 pump motor? The capacitor that failed is rated at 124-149 MFD and 165 VAC. Thanks.
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Does the motor come with everything you need to install it including gaskets?
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The motor does not come with any parts, gaskets, o-rings, or seals. You will need to identify what pump manufacturer and model you have to determine which seals and o-rings correspond.
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I have a Jandy HHP 1.5 pump and I need to replace the motor on that. What are my choices? Also, is there a decibel rating on these motors? Thanx.
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Here is the model number for my pump motor, k48m2n111a2 . The unit is leaking can you advise me as to the seals that I should replace? Thank you
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Hi Frank, We will need to know the model number of the pump housing in order to locate the seals. If you do not have the pump model you can send use photos of the housing for identification.
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What housing and seal plate do I need for this ST1152 motor?
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Hi Aaron, In order to match the correct parts, we would need to identify the pump that your motor attaches to. Please provide the make and model of your pump in order to better assist you. Thanks for your question.
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This motor is listed as a replacement for my Leslie's Hydromax II pump. Can I replace this with the dual-speed A.O. Smith B977t? Also, which Go Kit do I need with this pump. Thanks.
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Yes that dual speed would go with that pump. As far as the go kit, there isn't one with for that pump, but you should replace the shaft seal and housing gasket when you replace the motor.
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I have two different pumps.
1st pump I have is a AO Smith model # C48L2N134B1. this is the pool pump we had when we bought the house. This locked up and we bought a Hayward 1 1/2 horse but the model number we cant see. There is a number at the bottom which is SP1610Z1M.
I would like the replacement motor only.
Our pool is in ground and 40 x 20.
Thank you
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are pumps ST1152 and UCT1152 interchangeable? Both look to be replacements for C48L2N134B1 Hayward super pump motors
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It's gong to depend on if you have the UST1152 or the ST1152, the total horsepower is going to be the difference from 1.5HP to 2.25HP. So the UCT1152 will be good if you currently have to UST1152, unless you don't mind moving down in horsepower.
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We have a Hayward RS1500 pump with an AO Smith model # K48m2n110 1.5 hp motor.
Our pool pump is moving water but putting off a burning smell. shuts down in the middle of a cycle. No impeller blockage.
Assuming I need to replace my pump with your st1152, how does the motor separate from the impeller? They seem to be fused together with no obvious external screws. Also which tune up kit?
Thanks!
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That would be the correct replacement motor and the part numbers for the seals you will need for SPX1600Z2 and 5110-12A. As far as getting the impeller off, you will have to take the end cap off the back of the motor and hold the shaft with a channel lock so the shaft does not turn while you are trying to twist the impeller off.
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Hi: Our pump model# sp2610x15. I don't remember the original gold motor's spec. other than it was 1.5hp. the current motor is a USTt1152. Question: can I replace it with a ST1152?
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The SP2610x15 has a total HP rating of 1.5HP. The replacement motor is the UST1152 in use with a Tune-Up Kit. If you opt to replacing it with the A.O. Smith Round Flange 1 1/2 HP Full Rate Motor (C1101, ST1152) it is advised to change the impeller and the diffuser, to those that are recommended for the 1.5 Full Rate Motor ST1152. By increasing the size of the equipment you are increasing the the gallons per minute output from the pump. You will need to verify the design flow rate that your filter and plumbing is set for, before making your decision. If you only replace the motor using the ST1152 with the existing impeller and diffuser, you are only spending more money with no results.
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hi, mine is a c48l2n134c1 pool pump, will this one work?
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The direct replacement for that motor model number is the UST1152. You could replace it with the ST1152 but you might have to upgrade the impeller as well. For the motor replacement you will also need to replace the shaft seal as well. I can help you with that, just need to know the model of your pump.
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Hi INYO. I need to replace my pool pump motor. It is attached to a Hayward pump SP3015X20AZ (Super 2 pump?) driving a pool and spa. The current motor is a CENTURY UST1202 Total HP=2.20 Model K48M2N110C2. HP=2 FR 56J SF 1.1.
I see on your website that you sell the UST1202, ST1212, and the ST1152. Which motor do you recommend and what are the differences? Thanks.
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Good morning Mike, You are looking for A.O. Smith 2 H.P Round Flange Up Rate Replacement Motor - UST1202 The seal kit you will need is Tune Up Kit Hayward Super II - GOKIT2 Unless you have a salt pool then you would need a gokit2salt.
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Will this replace my motor? Currently running a AO K63CXEYPY - 4766, 1HP, SF1.4 attached to a Hayward SP3010EEA2 (Z?). I would like to upgrade the HP to 1.5.
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Hello, The motor that matches this unit is an Energy Efficient A.O. Smith Round Flange 1 HP Full Rate Motor - CT1102, if you switch to a ST1152 you will have to change out your impeller and diffuser. I highly recommend changing out your seals with Tune Up Kit Hayward Super II - GOKIT2.
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I am replacing an AO Smith motor #K48M2N110. What motor should I use and what else do I need to buy?
Thanks
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Yes, the ST1152 is the correct replacement motor, if you have the pump model I can help with the shaft seal as well.
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I have a 15 year old UST 1152 (motor model C48L2N134C1), should i replace this with the New UST1152 or upgrade to the ST1152.
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I would go with the direct replacement UST1152 and replace the pump seals as well.
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I have st1152 k48m2n110c1 and the bearings went out in it on my sp2607x10 Hayward pump and need to make sure I buy the correct motor because I will be installing it myself. Which is the correct motor and seal kit?
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The correct replacement motor is the ST1152 and the seal kit is the GOKIT3, but just letting you know that your pump model says it is a 1HP Super Pump but you have a 1.5HP motor. Do you have a 1.5HP impeller to go with your 1.5HP motor?
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I have a Hayward Super II Pump SP-3015AQ with an Century motor part #165111-21 3/4 pump. I need to replace the motor. I would like to go 1 1/2 HR with either the ST 1152 or the STS 1152 motor. What else will i need to complete this process.Thanks
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I have a 1.5 HP Motor: Century Centurion (AO Smith) CAT # B229SE (Part# 184982) PR: Y56J motor. Will this replace my current motor?
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I have a spa pump: Hayward 3015 X 20 EE. The correct (2HP) motor is too long to maneuver in place. It is located in a tight spot, so I assume the previous owner downsized the motor. I cannot read the old motor's label anymore, but the Impeller model # is SP 3015-C (which is a 1 1/2 impeller for a different pump)
Will this motor be a valid replacement?
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I have an aquatron II-6 pump and am replacing an ST1152. what gokit do I use?
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Hi Jeff you will require this AquaTron Seal Kit
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I have a Magne Tek Part #8-177080-40, 1.5HP, Type CX, 3450 RPM, CodeF, Encl DP, Frame Y56Y, Form KJM, 1081 Pool Pump Mnt Horiz
American Products #98710700, Model # 384484, Ser# 10966
Pool Pump.
What is the Replacement, and the Shaft Seal?
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The correct motor replacement will be the model B848 and if you click here you can view the parts diagram for your model pump. Key 2 has both the standard and saltwater version shaft seal but you can also purchase the GOKIT20 which has all of the seals and gaskets for your series pump. It uses the standard shaft seal.
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I have a 4 year old RS Series RS1500 Hayward pool pump 1.5 HP and need to replace the motor. Which model A.O. Smith motor should I buy to replace the one I have?
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Will this motor replace a B129 that is currently installed on a Hayward SP3010X15? What else will I need to order to complete the installation? Thanks
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Hi. Yes, this ST1152 can be used as a replacement for the B129 motor. You will also need the Super II Pump Tune Up Kit - GOKIT2 or GOKIT2SALT.
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I am replacing a Hayward SP3020EECP 1.5hp pump model K48M2N110. I am told the ST1152 is the correct replacement pump. My question- The original installation paperwork indicates the original pump may have been a 2hp pump (the 1.5hp is the second pump). This pump only runs water features (2 scuppers and 1 sheer descent). Is the 1.5hp ST1152 sufficient to run my water features? The furthest away water feature is about 50' from the pump. If this is the correct pump, what other products do I need?
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So this motor model may say 1.5 horsepower on it but it is a full rated motor. What that means is that its actual total horsepower is 2.25. That very well could align with what you paperwork states.
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Is this the correct replacement motor? And what other parts do I need? I have a A.O. Smith Model: K48M2N110 (? Plate is worn/faded), SER: 8B02, HP ½ (? Plate is worn/faded), Volts: 115/230 (? Plate is worn/faded), RPM: 3450, AMPS: 19.4/9.7, HZ: unknown (Plate is worn/faded), SF: 1.33, FR: 56J, PH: 1, Thermally Protected: CET36WX (? Not sure first letter, worn plate), CODE: L, INSUL Class: B, ENCL: ?, TYPE: UAK,
SP-1615-Z-1-BE
Pool pump is Hayward SP3015EECR.
Thank you for your help.
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Hi, Albert. Yes, this ST1152 is the correct replacement for MOD # K48M2N110. You will also need the Super II Pump Tune Up Kit - GOKIT2 or GOKIT2SALT.
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I currently have a k48m2n110 motor and would like to replace it with a variable speed motor. Is that possible and if so what do I need?
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I have a Hayward RS 1500 pump purchased from Leslie's that needs a new motor. The current AO Smith is a 1.5 hp 115/230 V 19.4/9.7 A, 56J Frame 1.33 SF Model K48M2N110. Will the ST1152 be a suitable replacement? I also use a SWG so can you advise on the proper pump seal, o-ring, gasket to use? Thanks,
Yes this is a single speed replacement motor for your model. Also, the seal kit is GOKIT2 for a chlorine pool, and if you have a saltwater pool then you can use the GOKIT2SALT.
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My motor is a Hayward Super II - The tag states SP1615-Z-1-BE. I can't find any reference to this pump in your site. I have figured out that I need a ST 1152 motor, a diffuser SPX3021B, an Impeller SPX 3016C, a Shaft seal PS-201.
The Ring is not so clear SPX 3005r?? Or SPX3021R as stated in the various question-answer area. Thanks
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Hi Jay, I double checked your motor # of SP1615-Z-1-BE and all the part #'s you stated in your email are correct. Since you use the SPX3016C impeller you will require this SPX3021R Ring
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I have a hydramax II motor 1 hp, I would like to replace it with a 1 1/2 hp. It looks like the ST1152 ao smith is the replacement and the SPX Impeller. Is this correct and if so do I need anything else?
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Hello, I'm looking to replace my burned out pool motor, a 56J frame 1.5HP with SF 1.33, total HP 1.995. It was suggested that the INYO motor, 56J frame 1.5HP with SF 1.5, total HP 2.25, would be ok using the same impeller, SP3016-C. Do you think the two motors are close enough in their Total HP specs to perform with no harmful effects? Thanks, Mark G.
Yes, that motor is a good match replacement.
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Does your impellor look in good shape? Worn? Replace it if is. This would be a good replacement motor don't forget to order your new pump seal kit also.Go kit 2
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Thanks, I meant to respond earlier. Impeller looks good and I picked up a kit. Thanks again.
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Yes, that motor is a good match replacement.
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I currently have the K48M2N110 1 1/2 HP motor.
This ST1152 is the replacement. My pool is 15,500 gallons. If I wanted to go with a 2HP to move water quicker which should I choose & is that wise?
Thanks
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Hi, Jim. The Total HP of your motor is 2.25. If you want to go with the ST1202 (2.6 THP) motor, you will have to first make sure your plumbing, filter size and circulation system is sufficient to handle the increased water flow using the steps in our How to Size a Pool Pump guide. Once you've confirmed, you will also need to replace the impeller, diffuser etc to match the increased motor.
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I have a Burnt out K48M2N110 and it appears that the ST1152 is the proper replacement. It was a remanufactured one and only lasted a year. The question is do I need any other parts to replace this myself? since it was only there for a year I’m assuming seals etc are still OK. It’s a salt water pool. Thx!
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Yes, the A.O. Smith 1.5 HP Round Flange 56J Full Rate Motor - ST1152 is the correct motor. It is suggested to replace the seal plate, impeller, and diffuser every ten years, along with the correct Tune-Up kit or Shaft Seal when you replace the motor. This will provide the most optimum performance of the life of the new motor. We will need the pump model number to provide the other necessary parts. (The shaft seal must be replaced every time you replace the motor.)
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I have a burned out K48m2n110 and want to confirm that the ST1152 is the correct replacement. Is there anything else I need to buy for the replacement?
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Yes, the A.O. Smith 1.5 HP Round Flange 56J Full Rate Motor - ST1152 is the correct motor. It is suggested to replace the seal plate, impeller, and diffuser every ten years, along with the correct Tune-Up kit or Shaft Seal when you replace the motor. This will provide the most optimum performance of the life of the new motor.
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I need to replace my motor and i believe this is the correct one. The electrical collar is broken where it mounts to the motor, do you have a part number for that?
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Hi, Darin. If you're referring to the 1/2" Watertight Conduit Connector, that can be purchased at a hardware or electrical store.
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I have a Hayward 1.5hp motor on my pool pump. Starting to make noise and getting extremely hot on bottom right side
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Hi Jerry, usually this is a sign of failing bearings or the motor itself. Could you send us a few photos of your pump and motor? Please take a close up shot of the motor label as well as a wide shot of the complete pump to include the pipes going in and out of the pump. To supply photos simply click the reply link below and upload your photos or chat with a live representative through our web page. Once we get those photos we can make the proper recommendation.
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hi
I received help from your chat. I just want to make sure this motor is good for my pool or should I get the UST.
Not sure what the difference is from Up Rate and Full Rate. Also if you can recommend a Go-Kit for this or anything I would need. I checked out the How To video. Should be doable. I have pics
Hi Patrick, the correct single-speed replacement motor is the 5212X. The seal kit is the GOKIT76 and here is a guide that we put together that will explain the difference between full and uprated motors.
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I am pretty sure I have line up the correct pump. Just placed the order, Can you verify that yes it is the right pump.
Hello, yes for the motor model k48m2n110c1 this ST1152 will be the correct single speed replacement motor.
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In your picture for mounting there are four bolts holes to attach the motor to the pump mine has six and is not round. The current motor I want to replace is a ST 1152 mod K48M2N110C1. Thank You
Your front pump housing model may be a different model than what you may have seen in a video. Please click here to view the Hayward Super II pump which may be your model,
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Thank You for the response, Can you recommend a specific model number that would work for me? I only wanted to buy the motor. Is it possible to re use the existing mounting flange and remove the round one that comes with the ST 1152?
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Patrick. This ST1152 is the correct replacement motor. You will also need the Super II Pump Tune Up Kit - GOKIT2 or GOKIT2SALT.
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We are replacing a pump #K48M2N110C1. Please confirm this is the correct choice and guide me to any seals or other materials recommended for replacement. Thank you
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This is the correct single speed replacement motor for the model K48M2N110C1 and in order to confirm the seal kit needed you will need to know the model name or number of the front pump wet end housing that the motor attaches to.
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Hi, can I use this motor for Hayward Super Pump self priming, model C48L2N13481, SER 10213J2, amps 18.6/9.3, SF1.0, FR 56J, HP 1 1/2 (purchased 07/2013). The super pump original motor lasted 3 years, got replaced by similar one up rated model HP 1 1/2, THP 1.65 and it is not working after 3.5 years. Like the super pump, not the up rated motor. Would like to have full rated one, like I had on the first pump and that one lasted 20 years.
Thank you.
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Hello, the full rated single speed replacement motor to match your motor model C48L2N134B1 is the 5222X. You will also need a Hayward Super Pump seal kit when you replace your motor. We put together this Video on How to Replace a Pool Pump Motor which you may find helpful when you tackle this project.
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Hi,
I have a 20,000 gallon in-ground pool with an AO Smith 1 1/2 hp, volts 115/230, Amps: 19.4/9.7 Model #K48M2N110 pump. I don't get as much water flow as I would like. What would be an appropriate upgrade to a variable-speed pump?
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Hi Michael, the correct variable speed replacement motor for your motor model K48M2N110 is the ECM27CU. When replacing a pool motor we do suggest a Seal Kit. Could you send us a few photos of your pump so we can suggest the proper seal kit? If so then please take a wide shot of the complete pump to include the pipes going in and out of the pump. To supply photos simply click the reply link below and upload your photos. Once we get those photos we can make the proper recommendation for your seal kit.
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My pool pump has been worked on several times in the last 25 years. I had the pool resurfaced a few years ago and the amount of water flow seems low. My chlorinator doesn't work well and the spa flow is low. Due to all the work, I don't know if I have the right motor/ impeller match. The motor is a K63CXEPZ4767 OR B796. Can you tell me the total hp of this motor and what impeller is correct for this motor. This is a Hayward Super II pump. Also, can I move to the next size pump to get more flow.
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Hi Donald, If your Super II Pump is from after 1990 then the proper impeller for the B796 motor is this Hayward SPX3016C Impeller if your pump is from before 1990 then you would require this Hayward SPX3015C Impeller.
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Will this motor work on a Hayward Northstar Model Number SP4015NS
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It really depends on the HP of your Hayward Northstar. But I do not see the ST1152 as a replacment for any of the Northstar pump HP's. Here is a link to the parts breakdown for the Northstar. You can find the proper motor on this page...Hayward NorthStar SP4000 Series Pump (2008-Current)
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I have Century 164304-24 & 193633-24 Pumps. Will the ST1152 replace them? I would assume I require fresh gaskets as well?
Hi Todd, You will actually need this B129 Replacement Motor for the motor included in your photo. When replacing a pool motor we do suggest a Seal Kit. Could you send us a few photos of your pump so we can suggest the proper seal kit? If so then please take a wide shot of the complete pump to include the pipes going in and out of the pump. To supply photos simply click the reply link below and upload your photos. Once we get those photos we can make the proper recommendation for your seal kit.
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Pictures per your request for seal kit
Todd, Thanks for the photos! You will require this Jandy PHP Shaft Seal and this Jandy PHP Pump Body Gasket and a tube of this Pool Gasket Lubricant for the Pump Body Gasket. We put together this Video on How to Replace a Pool Pump Motor which you may find helpful when you tackle this project.
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This is the nameplate on my pump. Will this pump be a suitable replacement?
Hello Eric. The Century Motors 1.5 HP Full Rate Motor model ST1152 is a compatible replacement for the A. O. Smith 1.5 HP Full Rate Motor model T1152.
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Is the ST1152 the right pump motor for the Hayward pump model shown in pic? The pump motor pictured is the one I was using but it is not the original. I got this pump motor from a company that trades worn out motors for rebuilt ones. It worked fine for 5 years.
Hello Darren. The Century 1.5 HP Round Flange 56J Full Rate Motor - ST1152 is a compatible replacement motor for the motor in the photo attachment. The Tune Up Kit Hayward Super II - GOKIT2 contains the parts necessary to complete the new motor installation. Attached please find the Hayward Super II SP3000 Series exploded parts diagram for reference.
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