By Century Motors



Part # USN1152

Warranty 1 Year

Dimensions 14" L x 6.5" W x 6.5" D

Alternate Part #'s 187630, 193221, 193685, 7-187630-02, 7-193685-02, EUSN1152, SP1610Z1MNS, SP1610Z1MNSC, SPX1610Z1MNS, 35-150-3125, AOSUSN1152, CRMUSN1152

Product Description

Uprated 1.5 HP motor; 3450 rpm, 208-230/115; 8.5-7.8/15.6 full load amps; 1.25 service factor; 56J frame

Note: NOT California Title 20 Compliant. 

California Title 20 Compliant Option:  EVC225

Motor Dimensions Motor Dimensions
Motor Image Motor Image

Product Specifications

1.5 HP
208 - 230/115 V
15.6/8.5-7.8 amp
Service Factor:
Total HP:
1.88 HP
Century (A.O. Smith)
3450 RPM
Commonly Used On:
Hayward Northstar Pump

?     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.

?     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 1/12/2012by 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 1/18/2012by 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 1/19/2012by 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.


Est. Repair Time

2 to 4 hrs

Tools Needed

Screwdriver, Nut Drivers, Pliers, Socket Set, Wrench Set, Adjustable Wrench

1     0

Seized drive shaft

Written on 9/30/2020 by Guest

I hate this pump with a passion but it is a great customer of mine that I did not want to make spend money on an entirely new different pump set up.
Drain water
Remove twist locK
Remove 4 exterior Motor to pump bolts
Remove next 4 bolts on bezel
Loosen rear metal cover screws
Remove impeller by securing the driveshaft nut and turning the impeller
Remove next two covers attached to motor
Turn off breakers
Remove electrical
Replace gaskets, seals and impeller spring
Reassemble in reverse with new motor

Were these instructions helpful? 


Est. Repair Time

1 to 2 hrs

Tools Needed

Screwdriver, Socket Set, Wrench Set

1     0

Old pump locked up

Written on 7/4/2019 by Guest

1 removed locking screw and took off the pump holder.

2 removed electrical

3 pulled old pump out. Took a little finessin

4 Had to unbolt pump from frame. Had to use a wrench on both ends to pull it. Put gasket back on with seal

5 then put new pump back it. This was a little hard to get in, nut once I started the Claire it came together fine.

6 hooked up electrical

7 flipped breaker and primed pump. Started up beautifully. Works great.

Were these instructions helpful? 


Est. Repair Time

Less than 1 hr

Tools Needed

Screwdriver, Nut Drivers, Socket Set

Pool Pump Stopped Working so I Replaced the Motor

Written on 11/12/2018 by Guest

Once I realized what the problem was, I removed the motor then replaced it along with the seals and bearings. A piece of cake!

Were these instructions helpful? 


Review Summary

 (Average 4.93  out of 5 stars)
14 Rating
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