What is Service Factor?
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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.
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Why do I need to purchase a new shaft seal?
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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.
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Why should I purchase a Tune Up Kit?
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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.
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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.
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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.
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How many gallons per minute does this model move?
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Hello Stu - The SN1072 is used on a 3/4HP full rated Northstar Pump. The GPM of a pump is determined by the "total dynamic head" or TDH . Example: At 40' of TDH, the 3/4HP full rated Northstar pump would push 80 GPM.
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I have a hayward 3/4hp northstar pump, motor sn1072. I would like to replace with variable speed motor. Which motor would fit? ECM 16CU?
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I have a Hayward Northstar motor 7-187629-02 that went bad, it is 1hp vs this 3/4 hp that matches the part number here. Does the 1/4hp make any difference or do I need to be at 1hp like the previous motor?
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Hello. In addition to the motor Horse Power (HP), the motor's Service Factor (SF) plays a significant part in selecting a replacement motor. The Service Factor is the Horse Power multiplier. HP X SF = Total Horse Power (THP) The SF rating can be located on the motor's label. The Century Motors 3/4HP Full Rated motor model SN1072 has a SF of 1.85, THP of 1.4. The Century Motors 1.0HP Up Rated motor model USN1102 has a SF rating of 1.4, THP 1.4. Both motors have identical THP, but different HP and SF. Providing your current motor's SF rating will further define the correct replacement. Century 3/4 HP Full Rated North Star Replacement Motor - SN1072 Century 1.0 HP Up Rated NorthStar Replacement Motor - USN1102
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