Save yourself the cost of a new motor. Check the capacitor first. When you turn on your pump and the motor produces a humming sound, the motor may be frozen so that it won't turn or you may have a bad capacitor. Check the capacitor. It can be replaced for a fraction of the price of a new motor. Note: Some motors have two capacitors: a run capacitor and a start capacitor. If so, check both.
Click Here to View Pump Motor Parts (Including Run & Start Capacitors, Bearings, and Switches) 
RJ Posted: 5/23/2022
I have a Raypak model RPAGP100. it just hums and doesn't run but will start when jump started with a screw driver on the shaft. What's the replacement capacitor for it?Reply
InyoPools Product Specialist Matt S. Posted: 5/23/2022
I suggest looking at the capacitor for the ratings or part number. Unfortunately, there is no listed parts diagram for that proprietary motor.Reply
Which wires to which terminals on new capacitor? Posted: 5/8/2021
Hello, If I reconnect replacement capacitor to wrong motor wires, can I damage it? Capacitor connections are not labeled. I did not take a picture before removing old capacitor. If I reconnect new capacitor to wrong wires (orange and white) can I damage it? I assume so...So, how can I determine which wires go to which terminal on capacitor? Thanks!Reply
InyoPools Product Specialist Matt S. Posted: 5/13/2021
It could damage the capacitor or the motor if wired incorrectly. What is the part, model, or catalog number on your motor's label? A picture of the motor label would be most helpful. Are the wires color-coded?Reply
jen Posted: 8/29/2020
I have a Century Centurion Part 7-193634-06. Can you tell me what capacitor to purchase?Reply
InyoPools Product Specialist Matt S. Posted: 8/31/2020
Your 2.0 HP Round Flange 56J Full Rate EE Motor - B130 requires the 30 MFD (5VR0303) (2444) capacitor.Reply
Anonymous Posted: 8/20/2020
I’m looking for a replacement for a Genteq 40uf 370vac run capacitor. It’s either part #24db400b370pa or 976b399ayp2.Reply
InyoPools Product Specialist Matt S. Posted: 8/20/2020
If you visit our run capacitor section, you could find our 370v 40 Mfd (rd-40-370)Reply
Anonymous Posted: 8/21/2020
Do you have the dimensions for this? The old capacitor has a diameter of 1 3/4” and height of 2 3/16”Reply
InyoPools Product Specialist Matt S. Posted: 8/21/2020
Length - 3-1/2", Diameter/Width - 1-3/4"Reply
Anonymous Posted: 7/13/2020
I have a hayward superpump with A.O.Smith motor C48K2N143B1. it just hums and doesnt run. Whats the replacement capacitor for it? The one in the motor has this on its label: 680171-002, 161 -- 193 uF 110V. Thanks.Reply
InyoPools Product Specialist Matt S. Posted: 8/25/2020
You can type that part number 680171-002 into our search to find the replacement: U.S. Seal Manufacturing Start Capacitor 161-193 MFD - BC-161Reply
Len Posted: 6/7/2020
I have an A.O Smith 2 HP pool pump and I think the capacitor is bad but I cant find it on the motor its model SP1520Z1ESC ...Reply
InyoPools Product Specialist Matt S. Posted: 10/23/2020
The correct replacement capacitor for the SP1520Z1ESC is the 88-108 MFD (BC-86).Reply
Rob Fraser Posted: 5/30/2020
Help! What size start and run capacitors do I need for a Max E glas P4EA6E-186L AO Smith motor U27-1234, K46K2PA105C1 115/230 volt, 75 kw, rpm 3450, fr-48Y, 60 hz, load 13.8/6.9 motor? Thanking you in advance for the reply.Reply
InyoPools Product Specialist Matt S. Posted: 10/23/2020
Your K48K2PA105C1 (QC1072) uses the 20 MFD (RD-20-370) run capacitor.Reply
Anonymous Posted: 4/20/2020
My pump started smoking and popping.motor still turns b hand.Reply
InyoPools Product Specialist Matt S. Posted: 4/24/2020
If the motor turns by hand, that just tells you the bearings haven't frozen up. But if your motor is smoking and popping, that is an electrical issue. Have you tested any of the motor circuitry since the almost fire started happening? Reference: Using the Proper Test Equipment to Troubleshoot Pool MotorsReply
Martin Posted: 1/29/2020
I have a AO SMITH Century centurion with this data on the name plate. Cat B128 Serial 007083M Part 7-164303-23 Type CX FR M56J HP 1.0 SF 1.4 PH1 Hz60 RPM 3450 Volts 230/115 AMPS SF7.2/14.4 TIME CONT ENCL DP FORM KJM CODE J. It is in Nevis an island in the Caribbean. Can you advise on what capacitors to take down that are appropriate for this pump. Thanks in advanceReply
InyoPools Product Specialist Matt S. Posted: 2/10/2020
The replacement run capacitor for the B128 - 1.0 HP Round Flange 56J Full Rate EE Motor, is the 25 MFD - 628318-307Reply
Anonymous Posted: 1/5/2020
I have a Century two speed motor - B984. It only hums when I turn it on low. It works fine on high. And it will run on low if I spin the motor or start on high and change to low. Could this be the capacitor?Reply
InyoPools Product Specialist Matt S. Posted: 1/6/2020
This sounds more likely a bad switch or governor issue than a resistor. Is this a new or old motor? Has it been recently re-wired?Reply
Anonymous Posted: 8/11/2019
I have a Hayward super pump model # SP2607X10A and I was just wondering what run capacitor I would need?Reply
InyoPools Product Specialist Matt S. Posted: 8/13/2019
We would need to know the part, catalog, or model number of the motor to identify the motor. The SP2607X10A is the pump housing model number.Reply
Mark T Davis Posted: 7/20/2019
I have a Pentair 340040 2hp pool pump. What run capacitor does it use? Thank you.Reply
InyoPools Product Specialist Matt S. Posted: 7/22/2019
340040 is the model number of the pump housing, we would need to know the model number from the motor label.Reply
Anonymous Posted: 7/10/2019
I have a.o. smith ac motor number C48C34A72. I want to know which capacitor model i need to replace\Reply
InyoPools Product Specialist Matt S. Posted: 7/11/2019
That number does not cross-reference to a part. Can you verify that is the correct identification number?Reply
Tom Posted: 7/9/2019
I have an AO Smith 1.5 HP pump model C48L2N134B1. When first turned on it hums for a couple of seconds and then starts. I assume it's the Start capacitor which needs to be replaced. Can you let me know the part number. Thanks!Reply
InyoPools Product Specialist Matt S. Posted: 7/10/2019
The start capacitor for the UST1152 is the 161-193 MFD (BC-161)Reply
CHiPs Posted: 6/19/2019
I have a Polaris PB4-60 pool vacuum pump with a AO Smith motor 7-173840-23, Type: CS, FR: N56CZ, HP: 0.75, SF: 1.50 It’s doing the hum noise thing. Can you tell me if it has both a start capacitor and a run capacitor? Do you carry the start capacitor? Thanks so much.Reply
InyoPools Product Specialist Matt S. Posted: 6/19/2019
The B625 booster pump motor only has a start capacitor which is the 124-149 MFD (BC-124).Reply
gp Posted: 5/20/2019
I took my capacitor off and when I came back the plastic had blown away. Is it okay to replace the capacitor w/o it being on there or is there something else I can use as a subsitute? ThxReply
InyoPools Product Specialist Matt S. Posted: 5/20/2019
The motor can be installed without that plastic sheet covering the capacitor. Its primary function is to act as a warning label, stating the end cover should be screwed onto the motor before operating.Reply
InyoPools Posted: 8/24/2018
Hello Kelly - The booster pump motors only have a start capacitor. If you are getting proper voltage to the motor and the start capacitor is good, we recommend replacing the motor.Reply
Kelly Posted: 8/23/2018
Does a booster pump have both a start and a run capacitor? I replaced the one that's mounted on the outside, but didn't think to look for another. When my pump is supposed to be running, there's no sound or anything. It doesn't overheat. I've turned the bolt head where the windings are and it moves freely. There's power actually getting to it, but nothing actually happens...Reply
Inyopools Posted: 7/13/2018
Hello Jacks - The run capacitor for the ST1152 is part number 5270-08. The start capacitor is part number 5270-11.Reply
jacks Posted: 7/11/2018
I have an AO smith st1152 model # K48M2N110c1. My motor hums when I turn it on but won't start. Can you give me the part number for the start and run capacitors? thanksReply
John M Posted: 7/4/2018
Just wanted to say thank you for this posting. Turned off motor for hour and a half and when I turned it on it just hummed. Thought my 4th of July was going down the tubes with no running pool and waterfalls all day. After reading this it took me one hour to get to the store and purchase a replacement capacitor and install it myself. Saved me about 5 days of waiting on a new motor and doing a motor replacement, plus it saved my 4th of July! Thanks!!!!Reply
Inyopools Posted: 1/29/2018
Antionio Anselmi - The capacitor is a good place to start. The start capacitor for a UST1102 is 5270-14.Reply