A.O. Smith 1 HP Up Rated North Star Replacement Motor - USN1102



Part # USN1102

By A. O. Smith

  5 Average  



Part # USN1102

Dimensions 14" L x 6.5" W x 6.5" D

Alternate Part #'s 187629, 193683, EUSN1102, SP1607Z1MNS, SP1607Z1MNSC, SPX1607Z1MNS, SPX1607ZMNS

Product Description

Uprated 1 HP motor; 3450 rpm, 208-230/115; 8.5-7.8/15.6 full load amps; 1.40 service factor; 56J frame

Motor Dimensions Motor Dimensions
Motor Image Motor Image

Product Specifications

Motor Name:
1 HP USN1102 & SP1607Z1MNSC Replacement Pool Motor
1 HP
3450 RPM
208 - 230/115 V
6 - 5.5/11 amp
Service Factor:
Total HP:
1.4 HP
Stock #:
USN1102 or SP1607Z1MNSC
Dimension Letter:
13.1 in.
Commonly Used On:
Hayward Northstar Pump

?     Asked on 1/19/2012 by Guest

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     Answered on 1/19/2012 by Patrick P.

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.

?     Asked on 1/18/2012 by Guest

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     Answered on 1/18/2012 by Patrick P.

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. 

?     Asked on 1/12/2012 by Guest

Why should I purchase a Tune Up Kit?

A     Answered on 1/12/2012 by Patrick P.

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.

?     Asked on 1/12/2012 by Guest

Why do I need to purchase a new shaft seal?

A     Answered on 1/12/2012 by Patrick P.

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.

?     Asked on 1/11/2012 by Guest

What is Service Factor?

A     Answered on 1/11/2012 by Patrick P.

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.


Review Summary

  (Average 5 out of 5 stars)
6 Rating
5 star:
4 star:
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2 star:
1 star:

The Most Helpful Review

129     7

 (5 out of 5 stars)  Excellent Pump Moter Replacement

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

 (5 out of 5 stars)  great motor

from Palm Coast, FL ()

Pros: ease of self repair, customer service, solid motor

Cons: as with anything, a little less expensive would be cool, however saved the difference and more installing it myself

Exact replacement for what I needed. The customer support was phenomenal. This was the first motor I replaced myself and couldn't have done it without the phone support. I recommend Inyo pools to anyone doing any pool repairs or work.

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 (5 out of 5 stars)  Northstar

from On line ()

Very easy to install. The original lasted 10 years and I expect the same for this one.

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1     0

 (5 out of 5 stars)  

from Dallas, TX ()

Pros: Easy to install and very good price

Great match to original motor and easy to install.

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 (5 out of 5 stars)  Hayward Northstar Replacement Motor


Pros: good

Cons: none

hopefully it will work we got it at the end of the summer and have not had a chance to use it yet!!!

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 (5 out of 5 stars)  Great product easy to install!

from Murrieta, Ca. ()

Great product and was easy to install! Shipping was fast and well packed!

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