By Century Motors



Part # ST1102

Warranty 1 Year

Dimensions 14" L x 6.5" W x 6.5" D

Alternate Part #'s 110283, 1104351428, 14542, 164565, 165112, 17328, 177025, 177483, 186915, 19993, 1K047, 317P856, 5KCR39SN2818X, 5KCR49SN2086X, 86598, 90118571, 91725, B128, B138, B708, C1100, C1488, C48I2N133, C48K2N123, C48K2N123A1, C48L2DA137, C48L2DB134A1, C48L2DB134A3, C48L2N102, C48L2N104, C48L2N106, C48L2N113, C48L2N119, C48L2N119A1, C48L2N122A1, C48L2N122A3, C48L2N131A1, C48L2N131A5, C48L2N131A6, C48L2N133, C48L2N133A3, C48L2N133A4, C48L2N134A1, C48L2N134B1, C48L2N134B3, C48L2N134B4, C48L2N134B5, C48L2N134C2, C55CXKLZ-5010, CT110C, EB128, EST1102, JD10FL1, M544, MTGC-1100, MTGC1100, S88-173, SPX1607Z1M, SPX1610Z1BEE, ST1102, SW2560, V14542, 35-126-3024, AOSST1102, CRMST1102

Product Description

Full Rated 1.0 HP motor; 3450 rpm, 115/230 Volts; 18.6/9.3 full load amps; 1.5 service factor; 56J frame

Note: NOT California Title 20 Compliant. 

California Title 20 Compliant Option:

Motor Dimensions Motor Dimensions
Motor Image Motor Image

Product Specifications

1.0 HP
115/230 V
18.6/9.3 amp
Service Factor:
Total HP:
1.5 HP
Century (A.O. Smith)
3450 RPM
Commonly Used On:
Hayward Super II , Hayward Northstar Full Rate and Jacuzzi Magnum

?     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 1/19/2012by 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 5/2/2013by Guest

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?

A  Answered on 5/2/2013 by InyoPools Product Specialist Patrick P.

If the motor is making a loud, screeching noise while it's running, the bearings have likely failed. Replacing the seals alone will not resolve the issue. The motor and seals  should be replaced.


Est. Repair Time

2 to 4 hrs

Tools Needed

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

1     0

My 14 year old Carvin Magnaforce Pool Pump motor shorted out -required replacement motor.

Written on 8/4/2021 by Guest

I ordered replacement motor from INYO Pools. I reviewed and followed the motor replacement videos which were most helpful. The new motor was a smaller diameter than the original. But a spacer was supplied and when installed provided the correct adjustment for the frame and provided a secure fit.The pump replacement seal kit ordered with the motor ensured a leak proof installation. All work was completed within a few hours. Pump has been running for two weeks now without any problems or leaks.

Were these instructions helpful? 


Est. Repair Time

1 to 2 hrs

Tools Needed

Screwdriver, Nut Drivers, Pliers, Socket Set

1     0

Pump motor had rotor lock

Written on 7/14/2018 by Guest

1. Went to fuse box opened breaker
2. Got volt meter checked on a live circuit, verified power to motor dead, verified meter with a live circuit
3. Unbolted motor from the pump
4. Unwired motor
5. Removed impeller from motor shaft
6. Remove backing plate for pump
7. Removed old impeller seal and installed new seal kit on pump backing plate
8. Install new slinger ring on pump shaft
9. Installed backing plate back on motor shaft
10. Replaced o-ring on backing plate coat new o-ring with o-ring lube help prevent cutting or pinching o-ring
11. Reinstalled impeller
12. Reconnect wiring and reinstall cover and check all connection are weather tire
13. Bolt motor back to pump housing snug bolts in a crisscross pattern don’t over tighten
14. Close breaker back in and start pump verify pump is pumping
15. Check pump for leaks

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 (Average 4.84  out of 5 stars)
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