Century 1.0 HP Up Rated NorthStar Replacement Motor - USN1102



Part # USN1102

By Century Motors

  5 Average  



Part # USN1102

Warranty 1 Year

Dimensions 14" L x 6.5" W x 6.5" D

Alternate Part #'s 187629, 193683, EUSN1102, SP1607Z1MNS, SP1607Z1MNSC, SPX1607Z1MNS, SPX1607ZMNS, AOS-60-6008, AOSUSN1102

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

Note: NOT California Title 20 Compliant. 

California Title 20 Compliant Options:

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 1/11/2022by Mark Harler

I'm trying to find a cover that goes over the electrical connection and over the capacitor at the back of the motor. Model USN1102. Do you guys happen to sell one separately? Has two screws to hold it down.

A  Answered on 1/12/2022 by InyoPools Product Specialist Eric J.

Good morning Mark, I apologize we do not have those replacement end caps for this motor available at this time. 

?     Asked on 5/13/2020by Francisco N Urbina

I have a sp4030ns 3 hp Its overkill for my pool. The pool had a 1 hp pump. Any chance I can replace the motor only to a 1 hp? Do I need to change the diffuser? Thanks

A  Answered on 1/5/2021 by InyoPools Product Specialist Hector F.

Hi Francisco, when it comes to sizing a pool pump there are a number of variables to consider. Here is a guide that we put together called "How to Size a Pool Pump for Your In-Ground Pool" that may assist you or you may want to at least consider having a CPC(certified pool contractor) perform a site evaluation to better confirm as well. 

?     Asked on 5/14/2019by Tommy

Does this have internal capacitor?

A  Answered on 5/14/2019 by InyoPools Product Specialist Hector F.

This motor has a run capacitor. 

?     Asked on 5/10/2019by Tommy

Does this motor have a 5/8”shaft

A  Answered on 5/11/2019 by InyoPools Product Specialist Lennox H.

Hi, Tommy. Yes, the shaft diameter is 5/8". 

?     Asked on 5/7/2019by Inyo Visitor

Hey guys, Any way to make this motor work with a Hayward SP4010NS pump with (standard) 1.0hp-rated impeller? Would replacing with a 0.75hp impeller make any difference (if this is even possible?!)? Thanks! T

A  Answered on 5/15/2019 by InyoPools Product Specialist Lennox H.

Hi. In order to use this motor with the NorthStar SP4010NS model, you will need to replace the Impeller Kit - SPX4007CKIT. Making this conversion will reduce the pumps water flow. 

?     Asked on 4/1/2019by HARLEY

Will this motor replace a Century Centurion 1081 pool pump duty - Part # SP1607-Z-1-MNSC ; Serial BZ01-15; 1 HP; RPM 3450

A  Answered on 4/2/2019 by InyoPools Product Specialist Michelle B.

Hello, Yes, that will be the proper motor replacement for your pump.

?     Asked on 2/8/2018by Art Pasquali

I want to replace my motor: SPX1607-1-MNSC W/ sf 1.4. Which of the two motors should I order: The -mnx, or the - Full Rated BNS? What is the difference? How can I identify my Howard Pump model. There is a serial number plate, but it's not legible (for ordering the rebuild kit? Thank, Art

A  Answered on 2/8/2018 by InyoPools Product Specialist Lennox H.

Hi, Art. You should purchase the MNS replacement motor USN1102. The difference between the two is the total horsepower. You have a NorthStar Pump model SP4007X10NS. You can call Hayward with the serial number to find out if the Hayward Northstar 4000 Series Pumps Tune Up Kit (Pre-2003) - GOKIT66 will work for your pump.

?     Asked on 1/19/2012by 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 InyoPools Product Specialist 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 1/18/2012by 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 InyoPools Product Specialist 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 1/12/2012by Guest

Why should I purchase a Tune Up Kit?

A  Answered on 1/12/2012 by InyoPools Product Specialist 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 1/12/2012by Guest

Why do I need to purchase a new shaft seal?

A  Answered on 1/12/2012 by InyoPools Product Specialist 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 1/11/2012by Guest

What is Service Factor?

A  Answered on 1/11/2012 by InyoPools Product Specialist 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.


Est. Repair Time

1 to 2 hrs

Tools Needed

Screwdriver, Pliers, Socket Set, Wrench Set

1     0

Motor Bearings noisy

Written on 10/18/2017 by Guest

Replaced motor with new one. Easy to do. Also replaced pump impeller.

Were these instructions helpful? 


Review Summary

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

The Most Helpful Review

The Most Recent Reviews