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) 
Antionio Anselmi Posted: 1/28/2018
Hello, First off, your site is amazing. I love that you genuinely want to sell people the correct product not an entire system. So, after reading comments I see that my pump when I turn power just quietly hums. Never starts up. Do you think that this is a start up capacitor issue? I have a century ust1102 1 hp motor on an in ground pool.Reply
Inyopools Posted: 1/2/2018
Caleb, The current run capacitor for B2853 is 2523057-001, 30 MFD, 440 Volt, 2” diameter. Older versions used a 30 MFD, 370 volt capacitor (5270-05) which was 1 ¾” diameter. Kit 10003946-001-001, has the 30/440 cap, with a larger housing to accommodate the larger capacitor. If you have the older capacitor, you can still substitute the larger 440V capacitor (with the larger housing). It is more resistant to voltage spikes.Reply
Caleb Posted: 12/31/2017
Hello, I need a replacement run capacitor for a Century Centurion. Label states following info: Cat: B2853 Serial: 03413CH Part: 0-F56AA37A01-04 HP - 1 SF - 1.25 RPM - 3450 VOLTS - 230/115Reply
Inyopools Posted: 11/13/2017
Bret - I'd try replacing the capacitor first. That's the least expensive fix.Reply
Bret Posted: 11/7/2017
I have a top capacitor in the casing on top of the pump. Mine just blew off one day while it was running....casing and all was blown away from the pump. The capacitor was extremely hot, so assuming it overheated. Do you think I just need to replace the capacitor or do you think the motor may be damaged as well? ThanksReply
InyoPools Product Specialist Dennis R. Posted: 8/28/2017
ebv128 - Check that the new capacitors have the same specs as the original capacitors. Then retrace your replacement steps to see if there was anything else you may have done to affect the switch. Check the switch.Reply
ebv128 Posted: 8/26/2017
With the help of the video, I have replaced both the start and run capcitors on my Sundance Palermo 2005 2-speed emerson motor. However, now the first speed is not as strong as it used to be, and i need to push the button twice for the high speed to kick in and then off, and then on for the first speed to kick in. Sugggestions, pleaseReply
InyoPools Product Specialist Dennis R. Posted: 8/14/2017
Anónimo - I'd try replacing the capacitor(s) first. You may have two capacitors, a run, and a start capacitor. They are the easiest repair. I can't help you much without knowing what pump you have. Do a search on our website for your pump. Once you find the pump's product page, look for the link to it user's manual. There should be a trouble shooting section at the end of the manual.Reply
Anónimo Posted: 8/10/2017
I have a pool pump that stopped working recently. There is a window on top of the motor where you can see how long it will run (2hr, 4hr, 6hr...24hr) and there is a timer button to select how long you want it to run and an on/off button. When the motor is plugged in, the light indicator for the hour selection blinks on and off, telling you that it is off. When you push the on/off button, it stops blinking (indicating that it is on) and the motor usually runs. The problem is that now, when it is plugged in, the light blinks and everything like normal, but when you turn it on, the light stops blinking but the motor doesn't run like it would usually do. There is no humming, no sound at all coming from the motor. The light indicator acts like it normally would, but the motor simply doesn't run or make a sound. Would the capacitor be the issue, or is it another problem. I can provide details if needed, please let me know and I hope to hear a response soon.Reply
InyoPools Product Specialist Dennis R. Posted: 8/7/2017
Ed - If the motor is humming, it's a good bet that one of the capacitors is shot. Try replacing the start capacitor first, behind the back cover, then replace the run capacitor. on top.Reply
Ed Posted: 8/6/2017
I have a Hayward 2.5 super pump that quit while running, will not start and makes a humming noise. There is a capacitor on top is there also a capacitor behind the cover on this model. thanksReply
InyoPools Product Specialist Dennis R. Posted: 8/5/2017
Terrell - I did not receive the picture through this comment page. Could you provide the motor's CAT and Part # along with it's HP, SF and amps?Reply
Terrell Posted: 8/2/2017
My capacitor went out, but my motor is only three years old. Here is a picture of the label: The Label reads:Century Centurion
Switchless Motor
No Switch * No Governor
2514514-001
Can you tell me what kind this is and if so, do you carry it?
Reply
Beachgirl629 Posted: 7/18/2017
I have swimming pool pump that is being used as a well pump. I was told the electrical start component has went out. I would like to send you a pic but there is no option. My starter capacitor does not look like the ones you are showing. Do I need to replace whole unit?I was having to plug it in everytime I used it. Then one day when I plugged it in, it went proof at the junction box.
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InyoPools Product Specialist Dennis R. Posted: 7/13/2017
Anonymous (UST1152) - According to our motor rep: "The capacitor only sees one-half the circuit, so it can use the 110-125VAC capacitor".Reply
InyoPools Product Specialist Dennis R. Posted: 7/13/2017
Anonymous (UST1152) - Thank you for your feedback. You make a good point. I will verify this with our motor rep.Reply
Anonymous Posted: 7/12/2017
Hello,In the following exchange your recommendation for a 110-125VAC Start Capacitor has me concerned... Since the UST1152 can be hooked up in a 230VAC configuration shouldn't the Cap be rated at least that high?
RJL Posted: 07/05/2017 18:55 PM Latest
We have an A.O Smith 1 1/2 HP motor for our in ground pool. On the top of the label it says "UST 1152" and along side the motor mod tab on the cover it lists it as "C48L2N134C1", Ser 10010CH. Anyway when I got home from work I noticed there was no water movement in the pool. It's scheduled to start up at 1000/am. No hum coming from the pump. This was at about 300/pm or so. I turned the switch off and on again it it hummed for a few seconds, 10 or so and turned off. How many capictors on this model? Does it sound like a capictor issue?
Thank you, JAM
Inyopools Posted: 07/09/2017 12:34 PM Latest Inyo Product Specialist
RJL - Replacing the start capacitor on your motor is a good place to start. The start capacitor for a UST1152 motor is Capacitor, MFD 161-193 (BC-161) 110-125VAC.
Reply
InyoPools Product Specialist Dennis R. Posted: 7/11/2017
Slamfam - I'd check to make sure you have the right capacitor. Tha start capacitor you bought is for either a 1HP or 1 1/2HP uprated motor, like a UST 1102 or a UST 1152. Make sure your wire connections to the pump are tight. Make sure the motor shaft spins freely. Check that the governor is not stuck open. Other than that, you may have a short in the motor windings, which generally means a new motor.Reply
Slamfam Posted: 7/10/2017
I just replaced the capacitor on a Hayward Super Pump (like the one in the video). When I turned on the power, it tripped the breaker. The new capacitor is rated the same, 161-193 MFD, 110-125 VAC. Is it possible the new capacitor is bad or am I looking at a new pump? The problem started Saturday the 9th. I turned off the pump to backwash the pool and when I turned it back on it did not start but was humming so I started with the capacitor. Any help would be greatly appreciated.Reply
InyoPools Product Specialist Dennis R. Posted: 7/10/2017
mcol75 - The capacitor for you motor, 7-187582-02, is Capacitor, Run 370v 35 Mfd (rd-35-370).Reply
mcol75 Posted: 7/9/2017
Hi our capacitor is out for our 2.0 HP pump (AO Smith 7-187582-02). I cant read the size info on it anymore. What size capacitor should I order?Reply
InyoPools Product Specialist Dennis R. Posted: 7/9/2017
RJL - Replacing the start capacitor on your motor is a good place to start. The start capacitor for a UST1152 motor is Capacitor, MFD 161-193 (BC-161) 110-125VAC.Reply
RJL Posted: 7/5/2017
We have an A.O Smith 1 1/2 HP motor for our in ground pool. On the top of the label it says "UST 1152" and along side the motor mod tab on the cover it lists it as "C48L2N134C1", Ser 10010CH. Anyway when I got home from work I noticed there was no water movement in the pool. It's scheduled to start up at 1000/am. No hum coming from the pump. This was at about 300/pm or so. I turned the switch off and on again it it hummed for a few seconds, 10 or so and turned off. How many capictors on this model? Does it sound like a capictor issue?Thank you
Reply
InyoPools Product Specialist Dennis R. Posted: 6/26/2017
Anonymous (3400vs) - Not sure if the 3400VS has a start capacitor, but if it does, replacing it would be a good place to start. The capacitor would be under the end electrical cap if it has one.Reply
Anonymous Posted: 6/23/2017
My hayward 3400vs motor won't start..could Ithis be the start capacitor?Reply
InyoPools Product Specialist Dennis R. Posted: 6/20/2017
Splashed - Most pool motors capacitors cost between $15 and $30. See Capacitors. So I'd recommend changing the capacitor(s) before buying a new motor. If your repairs are going to take a couple of days, you might throw in a couple bags of shock treatment especially if your pool is starting to turn a little green. Most pools only have 1 skimmer.Reply
Splashed Posted: 6/19/2017
So, our Hayward pump is humming, and from what I sm learning, if we want to replace the capaciter, that is a good sign. But heres what. From my research, they run about 150 estimated each and a brand new pump is 325. My experience with most engines or electrical parts is if you replace one, the other is usually not far behind. Our pump motor is an AO Smith and to replace with a Hayward, would be less expensive than buying two capaciters, and a lot less work. One of my concerns is what about why this happened? Is there a clog or problem? We have to find that. We cannot backwash to clean sand, ir flush a line, etc., so I guess this is a good time to replace sand. Should we load the pool with anything to keep anything from growing while we get tbe parts and fix this? Also we have only one skimmer... is that protocol for most pools? We are novices, we bought this house, this pool, these issues. GrrrrrrReply
InyoPools Product Specialist Dennis R. Posted: 6/13/2017
Ugggh - Your O-173840-23 motor is an AO Smith Booster Pump Motor - B625. It has one start capacitor on the top of the motor, Capacitor 124-149 Mfd 125v (BC-124).Reply
Ugggh Posted: 6/12/2017
I have a AO Smith Century Pool O-173840-23 pool pump for my bottom sucker. Hums then shuts off. It has a capacitor on the top. Does it have one in the housing too?Reply
InyoPools Product Specialist Dennis R. Posted: 6/1/2017
Brenda - Unfortunately, we do not carry this pump/motor and I can't locate in on the internet with the numbers you provided. If this motor has a capacitor, it would be under the electrical cap on the end of the motor. Look for burn marks. Replace the capacitor, is applicable. If no luck, your motor probably needs to be replaced.Reply
InyoPools Product Specialist Dennis R. Posted: 5/30/2017
JenRM - This motor, 7-184981-23, is an A.O. Smith Motor 56J Threaded, Up rated 1 Hp (b228se). It has no start capacitor, only a run capacitor - part #, 5270-05, 370V, 30 Mfd. Check the run capacitor for damage. They usually bulge out at the ends. If it looks good, your motor probably has a short in the windings and you may need a new motor.Reply
InyoPools Product Specialist Dennis R. Posted: 5/29/2017
Glo - This motor only has a run capacitor, no start capacitor. The run capacitor is mounted on top of the motor under the bump. I'd try replacing the run capacitor first but the humming might be due to a short in the windings which generally means a new motor.Reply
InyoPools Product Specialist Dennis R. Posted: 5/29/2017
Clint - If this motor has a start capacitor, it will be behind the electrical cover like in this guide.Reply
Brenda Posted: 5/29/2017
I have a waterway wet end above ground 2hp pool pump. It's humming, and kicks the breaker. It won't start up, and I've even tried jump starting it. I can turn the screw with a screw driver, but no luck starting it. Is it the run capacitor? Here is the info regarding model number, etc:Model# SD-20-1N11CD
Part# PX1200-6
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JenRM Posted: 5/29/2017
Hi,I have a sp2607x10 Hayward pump with a 1Hpmotor, replaced 8 years ago, part 7-184981-23. The info I found in the motor manual says the capacitor is '2443' but I can't relate that back to something I can buy. I see 370vac and 6% and 307 on the capacitor (I don't want to remove it until I have the replacement). Can you help me with what capacitor I need to get for the replacement? The motor just hummed when I tried to start it this year and I can't feel any debris in the impeller so I'm hoping it's the capacitor.
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Glo Posted: 5/27/2017
I have n A.O. smith part 7-165199-05. 1HPpool pump. I am trying to get into the capacitor but my screws are stripped. Does this model have a start and run capcitator? Only hums when I start it. Do I also need to get into the motor? Would that be the run capacitor on the inside and the start on the outside? Might need a manual and two capacitors. Please advise.Reply
Clint Posted: 5/26/2017
I have a Ningbo Tuozhan 1 HP motor Model number RS4G24213L and hums when to turn on the power but I can get it started by using a screw driver to spin the motor shaft end. Can you tell me if this motor has a start capacitor and where is it located? I'd appreciate your help. Thank you very much.Reply
InyoPools Product Specialist Dennis R. Posted: 5/19/2017
David - Your pump motor uses a 25 MFD, 370 Volt run capacitor. It does not have a start capacitor.Reply
David Posted: 5/18/2017
Ok, my turn..... I have a Sta-Rite Max E pump model # P6E6C-204L. Can you tell me how many capacitors it has and what the correct replacement(s) would be?Thanks in advance.
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InyoPools Product Specialist Dennis R. Posted: 4/21/2017
Raymond - I would wire the capacitor as shown. It connects to three different circuits including a startup circuit. See Step 8 in our guide on "How the Common Capacitor Start Pool Motor Works".Reply