need info on my capacitor

[devopool]

My 2008 Century Centurian 3/4 hp B668 booster pump for my Polaris 280 is not running and makes a humming noise. When I look at the shaft underneath, it seems to be moving smoothly. I'm guessing I might need a new capacitor (hope that's all!). I went to my local pool store and they will sell me a new capacitor for $30 but they said they can't test the old one for me (I brought it in with me).

Another customer suggested an auto parts store should be able to test it--no luck there. Can anyone help me find the part number so I might be able to order online for less money? I don't mind spending $10-15 to see if that's the problem but I don't want to spend more than that.

This is the capacitor under the hump that sticks up on top of the pump (is that the correct one--it seemed easiest to get to!). I've attached a photo with the info on the capacitor...I tried to upload another shot of it along with the pump but it wasn't letting me. Let me know if you need more info.

Thanks!
Devon

 

[JohnT]

http://www.amazon.com/Capacitor-25-MFD-370VAC-RD-25-370/dp/B004HGYFWW

You'll need to check dimensions.

 

[devopool]

Will do. Thanks for the quick reply!

 

[Divin Dave]

you can easily test a capacitor if you have a volt meter. Very simple to do.
https://www.youtube.com/watch?v=iRt9WYK1wdQ

If you have a digital meter, first turn the dial to OHMS and touch the terminals on the capacitor.
Then turn the dial to volts and see if the voltage jumps and the slowly discharges

 

[racket]

The capacitor is metal... Make sure to replace it with a run capacitor, not a start capacitor.

http://www.amazon.com/CAPACITOR-370...m_sbs_e_4?ie=UTF8&refRID=1G1A7W5FNTX5C1AGNQSS

 

[vinper]

be careful capacitors hold a charge and can shock you even when disconnected. have to ground it . usually bad ones have bloated sides or top . usually if there bad the shaft will not be turning .

 

[JohnT]

The capacitor is metal... Make sure to replace it with a run capacitor, not a start capacitor.

http://www.amazon.com/CAPACITOR-370...m_sbs_e_4?ie=UTF8&refRID=1G1A7W5FNTX5C1AGNQSS

There is no difference in a run and start cap other than the values usually differ significantly.

 

[devopool]

Well, I checked the capacitor (discharged it first) with an analog meter. Like in the video, I saw the needle go over to the right and slowly back. So it looks like it's a good capacitor. I was going to buy one from Amazon but I guess there's no need now.

The shaft runs smoothly w/o the motor being on so it wouldn't be the impeller, would it? I guess maybe it's time for a new motor. This one is from 2008...does that sound about right? I know they don't last forever!

 

[yukonsc]

For what it is worth - I had the same symptoms last year. I checked the capacitor and thought it was good but I switch the capacitor just to be sure I wasn't missing something (and I wasn't). I ending up buying a new pump off Amazon.