A.O. Smith 1 HP Round Flange Up Rate Motor (UST1102)



  (4.84 out of 5 Stars on 162 Ratings)
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Product Details


ALTERNATE PART #'S168098, 177019, 186921, 54023, 5KC39PN2822X, 8-168098-20, 8-168098-21, 8-177019-20, 8-177019-22, 8-177019-24, B228, B228SE, C1318, C48AA35A01, C48K2N117A9, C48K2N143, C48K2N143A3, C48K2N143A4, C48K2N143A5, C48K2N143A6, C48K2N143A9, C48K2N143B1, C48K2N143B3, C48K2N143C1, EB228, EUST1102, JD10UP1, KC39PN2822BX, SP1607Z1M, SP1607Z1MBK, SP1607Z1MH, UST1102, V54023

Product Description

Rugged and quiet Century brand motor (formerly A.O. Smith) designed for the demands of your pool. Sealed ball bearings, specifically selected for extended life and low noise, have lifetime lubricant to protect against heat and moisture.  This quality pool pump replacement motor is used on Hayward Max Flo, Hayward Super Pump, Hayward Super II, Hayward Northstar and Jacuzzi Magnum pumps.

Voltage 115/230, Max Amps 115V = 15.0 230V = 7.5, Single Speed, Round Flange, RPM = 3450, Threaded Shaft, Frame = 56J


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Motor Dimensions Motor Dimensions Motor Image Motor Image
Motor Name:
1 HP UST1102 Replacement Pool Motor
1 HP
3450 RPM
115/230 V
15.0/7.5 amp
Service Factor:
Total HP:
1.1 HP
Stock #:
Overload Protector:
Dimension Letter:
11 in.
Commonly Used On:
Hayward Max Flow, Hayward Super Pump, Hayward Super II, Hayward Northstar and Jacuzzi Magnum
Product FAQs


Q:I have a old Jacuzzi 94027110 and I want to know if this motor will replace the one I have? If so is there any special wiring or anything else that will need to be done or can I just take the old motor off and put this one into the housing and wire it? I would rather not buy a whole new pump unless it is absolutely necessary.

A:Yes the UST1102 would be the replacement motor for your 1 HP Jacuzzi Magnum pump and there would be no different wiring required, we would suggest a Jacuzzi Magnum tune up kit when replacing your motor which includes a shaft seal, o-rings, gaskets and lubricant. Typically if you use your old shaft seal it will not mate up properly which will cause leaking.


Q:I need to replace the motor on a Hayward Super Pump 3/4 hp. Can I go up to a 1 hp and what difference does that make? If so, does anything else need to be changed out? This is for an inground 16' x 32' pool.

A:You could go up to a 1 HP motor which would give you a higher gallon per minute rating (GPM). On a typical pool a 3/4 HP Super pump will have an output of 50 GPM's where a 1 HP will have an output of 65 GPM's. You would want to make sure that your filter could handle this increased flow rating from the 1 HP motor your filter should have a label on it which says max flow rating, this would let you know how many GPM's the filter can handle. If you increased your motor to 1 HP you would need to also replace your impeller to a 1 HP impeller, we would also suggest a Super Pump tune kit.


Q:Will the AO Smith UCT1102 cost less to run than the UST1102?

A:Yes, the UCT1102 will cost less to operate compared to the standard UST1102. Depending on how the motor is cared for, it should last several years. When replacing the motor, I would recommend buying a tune up kit based on your pump model and age.


Q:Are all pool motors wired the same?

A:No. The motor should be wired following the wiring diagram on the motor itself.


Q:My pool pump motor makes a humming noise when I try to start it. Will replacing the motor fix my problem?

A:Replacing the motor should solve your issues. Aside from the motor, you will need a GOKIT to replace the seals on your pump.


Q:Do you offer a spacer that could be used to switch from a 56 frame motor to a 48 frame motor? If so what is the part#?

A:There is a rubber spacer included in the packaging with all of our standard 48 frame pool and spa replacement motors.  No other accessory should be required.   


Q:Can I replace my 1.5HP motor with a 1HP?

A:Yes. You can downgrade the motor. You will also have to downgrade the impeller, diffuser and eye seal (if applicable) as well.


Q:My new motor is running hot. What could be wrong?

A:There are several different causes for this. The most common would be improper ventilation, incorrect impeller size or incorrect voltage. for more causes, you can take a look at our >Motor Troubleshooting guide.


Q:Can I replace my single speed motor with a dual speed?

A:In most cases you can switch from a single speed to a dual speed pump motor with no issues. This will depend on the model pump that you currently have. Please note that the motor does not come with a switch. In order to control the high and low speed you would need a timer capable of doing so. If you already have a 220 volt timer then you can purchase a T106R. If you do not have a timer then you would need to purchase a T10604R. It is highly recommended that you purchase the seals and gaskets for the pump when you replace the motor.


Q:I am looking for a replacement motor for my pool pump but all the ratings listed on the label are confusing me. What are the important stats on a motor label I should look for to ensure I'm getting the correct motor?

A:The key points on a label to know to ensure the proper motor selection are the Model number, Part number or Catalog number. If a match of one of these numbers is found, that match is the drop-in replacement for your motor. We also provide a guide on >How to Read a Pool Motor Label


Q:I just installed a brand new motor. It runs fine but it seems that it is running "hotter" than my old one. What would cause that?

A:If the motor is running "hot", you will want to double check the wiring. Most 230/115v pool pump motors are factory preset to 230 volt. If you only have 115 volt, you will need to re-wire the motor using the wiring diagram provided on the motor label. You may also want to check the condition of the cord as well. A cord that looks worn will not be able to produce enough current for the motor to run properly. The cord should be replaced when replacing the motor.


Q:I recently changed my pool motor and gaskets. I made sure to lubricate all the gaskets with vaseline. A few days later water is leaking from the pump. What did I do wrong? Help please!!

A:You never want to use vaseline on any rubber gaskets or o-rings. Vaseline is petroleum based and will deteriorate the rubber quickly. Whenever you change the motor on a pool pump it is recommended that you replace the gaskets and shaft seal as well. A >Go-kit contains the shaft seal, packet of non-petroleum based lubricant and gaskets you will need for your pump. If you already have the gaskets, you can purchase >Magic Lube.


Q:How do I change the shaft seal on my pool pump?

A:Changing the >shaft seal is quite simple. Here's > >How To Replace a Pool Motor Shaft Seal.


Q:How do I change the motor on my pool pump?

A:Changing the motor on a pool pump is not that difficult. Here's a video on How to Replace a Pool Pump Motor. In addition to the video you can read our step by step guide here  Make certain that you purchase the correct shaft seal or Gokit to go with your new motor.


Q:I have a Hayward Super Pump motor Part # C48K2N143B1. What is the Energy Efficient equivalent for this motor?

A:The part # for an energy efficient replacement motor is >UCT1102.


Q:I have a leaking pool pump that seems to be getting louder when it turns on. I made sure everything is clear inside of the basket. How do I know it's just the motor? Please help.

A:If you have a leak, it is more than likely caused by a failed shaft seal. Once the shaft seal fails water is able to enter the motor body and cause damage to the bearings. Typically it will cause the motor to run louder than normal and the motor will eventually fail. Your most cost effective option would be to replace the motor and the surrounding seals/gaskets. You can purchase the >shaft seal alone, but it is recommended you purchase a  >GoKit. A Gokit contains the shaft seal, housing gasket, lid gasket, diffuser gasket and non petroleum based lubrication.


Q: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: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.


Q:I'm trying to find a replacement motor for my pool pump but my model number doesn't match what you have listed as the model number. My model number begins with a C48 and yours begins with an SP. Please help.

A:What we have listed on our chart pages is the pump model number. The model number you have will just identify the motor. If you look on the plastic housing on the pump there should be a sticker which will have the pump model number. You can usually find this by the discharge port on the pump. Once you locate it you can choose the correct replacement motor. Be certain to change the shaft seal and gaskets as needed. You can use our >How to guide if you need help.


Q:Why should I purchase a Tune Up Kit?

A: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.


Q:Why do I need to purchase a new shaft seal?

A: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.


Q:What is Service Factor?

A: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.

Customer Reviews

Ratings Summary

Average Rating:   (4.84 out of 5 Stars)

Recommended: (98%) 158 of 162 customers would recommend this product to a friend.

162 Ratings 5 star:   (137) 4 star:   (23) 3 star:   (2) 2 star: (0) 1 star: (0)

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The Most Helpful Review

92 of 97 people found the following review helpful:

   (5 out of 5 Stars) Excellent Pump Moter Replacement

Reviewed By: from Clarence, NY ()

Pros: Awesome fit - excellent replacement

Cons: none

Tip to get the impeller off the old pump moter: use a 7/16" open ended wrench - it slides in near the capacitor on the electrical side... rotate the impeller until the wrench slides into place at the end of the shaft and then one person holds the motor and the wrench while a 2nd person loosens the impeller off with bare hands by turning the impeller counter clock-wise.

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The Most Recent Reviews

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   (3 out of 5 Stars) Product Received from Century Motor not AO Smith

Reviewed By: from CT ()

Pros: Price, delivery, fit

Cons: durability?

It is clearly labeled and sold as AO Smith. I received a box and motor from Century Motor made in China. It is not AO Smith but a generic brand. I attempted to buy a product with "AO Smith" Brand name on it. My original motor was made by AO Smith not by Century and was labeled as such. While this fits and is working, only time will tell if this product will last ten years like the real AO Smith motor did. I will know by 2024 if I still own this home or if the motor fails before then! I had a great experience with the real AO Smith product and now have to "HOPE" for the same with this Chinese product. Feels like a "bait and switch" to me.

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   (4 out of 5 Stars) pool pump motor

Reviewed By: from Williamstown, NJ ()

very fast and efficient. easy to install.

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   (5 out of 5 Stars) Performed as promised, fast shipping!

Reviewed By: from Girard,Oh. ()

Cons: none

This product installs easily & performs as promised. Quiet and powerful

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   (5 out of 5 Stars) Pool Motor

Reviewed By: from Alabama ()

Pros: Quiet. Easy to install. Great price.

Cons: None

Easy installation. Very quiet. Great price. Order arrived in two days.

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   (5 out of 5 Stars) Great motor, AND price.

Reviewed By: from Morristown TN ()

Will order from INYO in the future for sure!

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   (5 out of 5 Stars) Excellent Install Instructions

Reviewed By: from Annapolis,MD ()

Pros: Excellent Install Instructions

Cons: NONE

Great step by step pics and text.

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   (5 out of 5 Stars) Great

Reviewed By: from Wilson nc ()

Pros: Cheaper thN getting new pump

Cons: Be a little hard for novice

Much cheaper than buying new pump. Staff at Inyo was great and very helpful. Wonderful how to guides on their site.

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