Need a capacitor

[Jim in NC]

Does anyone have a clue as to what capacitor this is? It has failed and is needed in a Sears benchtop sander. It went out a few weeks ago, and I have had no luck locally and parts are NLA. There are no markings on it whatsoever. I am asking to see if it is repairable, worth repairing, or needs to go to the scrap pile. Thanks for your help and suggestions.

 

[Ericp351]

That is scrap. Test motor windings for open. If ok (not) , write down motor nameplate data , bring scrap cap to motor repair shop, smile nice, and you are good to go for $12 new, $2 or so used.

 

[Geo-TH,In]

I have a box of used start capacitors.
If you find a capacitor that will fit, a good change it will work. Make sure the start switch isn't stuck closed. A stuck switch will fry a start capacitor.
Post a pic of the rotor and inside the motor. The rotor end should have part of the end switch.

 

[wore out]

I don't see a starting switch, if none that is a ''PSC'' (permanent start capacitor) motor.

What is the model number of the tool?

Were you able to look it up on Sears parts?

If so, was a part number shown for the obsolete part?

Is there a horsepower or Amp draw rating on the motor?

A typical PSC capacitor rating for a motor in the 1/4 - 1/2 HP range would be in the 5 - 12.5 mfd range, and a 370 Volt rating.

At this point, with no more info available I would try a 7.5 mfd capacitor and observe how the motor starts and runs vs. previously.

 

[Jim in NC]

I should have added that the motor would run close to normal speed before I took it apart. It just did not have any pulling power. A piece of wood lightly against a sanding belt would drop its speed to nothing almost instantly. I do have the paperwork with the sander, and I will try to post the part numbers that I have.

 

[Geo-TH,In]

IF anything prevents the motor from coming up to full speed within a second or two will toast the capacitor too.

Get a used capacitor and try it.
If it doesn't come up to speed, get a larger capacitor.

 

[Jim in NC]

I was only able to find the model number, and again what parts info I find is there are none
available. It has a 2/3 hp motor and the model number is 137.215360. I have had to load hay, feed
critters, and ran out of daylight. Thanks again for the suggestions.