Craftsman 33 gal Air Compressor 6 hp Horizontal k Oil Free Pump Logo

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Posted on Apr 11, 2011
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I HAVE A SEARS AIR COMPRESSOR, MAYBE 15 YEARS OLD WITH 5HP MO-6436, I NEED THE VALUE OF THE START CAPACITOR, THE RUN CAP. IS 25 microfarads @ 340vac, THE START CAP EXPLODED AND THE ID # WAS WORN OFF, THANKS RICKY

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  • tonyabailey1 Apr 12, 2011

    Yes, purchased cap but did not work, good information anyway. Thanks, Ricky

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2 Answers

Kelly

Kelly

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  • Master 3,740 Answers
  • Posted on Apr 11, 2011
Kelly
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Hi Ricky welcome to FixYa, I am Kelly
Do you know if your model number starts with 106, 919, or 921? Also is it an upright stationary or a horizontal portable compressor? I am pretty sure you have the Century 6 Hp motor. (Obsolete FYI) but I will try and find the correct capacitor. IF you do have the Century electric motor... it is going to be a long search.

Normally a Craftsman model number would be 106.xxxxyyyy or 919.yyyyxxxx that information would be very helpful.

Kelly

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  • Kelly
    Kelly Apr 11, 2011

    Ricky the replacement start capacitor can be found here:

    http://www.mastertoolrepair.com/motor-st...



    However.... I still need to find the mfd value for a 6 hp motor. Still researching.



    Kelly


  • Kelly
    Kelly Apr 12, 2011

    I forgot to ask..... is this 115VAC or 230VAC? It will make a difference in the Start Cap.

    Kelly

  • Kelly
    Kelly Apr 12, 2011

    Your actually going to need a 400 - 488 MFD capacitor to start your compressor. A good rule of thumb is 80 MFD per HP and with most capacitors having a 20% tolerance the 400 - 480 MFD starting capacitor will work for you.

    Here is the kicker.... a 115VAC motor will need a 165VAC capacitor, A 230 VAC motor will need a 250 - 320 VAC Capacitor

    For the 230VAC capacitor:

    http://www.grainger.com/Grainger/DAYTON-...

    For the 115-125VAC capacitor:

    http://www.grainger.com/Grainger/DAYTON-...



    Just note the size of the case... this is a large capacitor. You may need a smaller one.



    Usually a start capacitor fails big time because there is a pr0blem with the centrifugal flyweight start swtich inside the motor.

    See this file:
    http://nh2az.com/files/compressor/compre...





    Kelly

  • Kelly
    Kelly Apr 12, 2011

    Hi Ricky I note the cap did not correct the problem. As I said before most often start Caps fail because there is another problem in the motor. If you get a chance look at the start switch. Some times the just need a spring or some lubrication. If it tossed one of the flyweights you have to replace it. Read this article again:

    http://nh2az.com/files/compressor/compre...



    Hope you can bring this one back to life.



    Kelly

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J Pilke

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  • Posted on Nov 05, 2014
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My Craftsman compressor is about 15 yrs old. One of the two capacitors is: Mallory
400-480MFD 16vac
52A103937-1
235-9621-01A

It is my understanding that this is the START, but I am not 100% sure

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