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Atlas Copco Air compressor wont start and throws power out!

Have a Atlas Copco air compressor and i turn it on and it just tries to start and throws the power out, the motors not siezed as the generator and motor turns around OK. Thanks

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  • sjbrewy Jul 31, 2010

    I ended up getting it going as i pulled and reconncted all the spade joiners on the smaller cylindrical tube (couldnt do it to the capacitor-larger tube- as wires are soldered), and wire joiners in the electriclal box on top of generator and the pressure switch that turns it on and off with air pressure level and to my suprise its working fine, tried it about 6 times and good, so one of the wires must have needed reconnecting, they were all on there good but must'nt have been making good contact.

  • sjbrewy Jul 31, 2010

    I got it going, i disconnected/reconnected all spade wire connections from the other cylindrical tube above capacitor, couldnt do that one as wires are soldered, did wires on electrical box on top of generator and the air pressure switch and to my suprise it works OK.



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If your problem is only when there is pressure in the tank you most likely have bad pressure relief valve. If you drain the tank and it starts then you just need to replace the pressure relief valve.
If it happens whether you have pressure in the tank or not you most likely have a bad starting capacitor. If you have a motor repair shop near by it should be a fairly inexpensive repair. If you've ever run the compressor on an extension cord this is the most likely problem but it is possible you burned out the starter windings. The motor repair shop can tell you rather quickly which it is. If you don't have a motor repair shop near by you can order replacement starter capacitors from be sure to give the length and diameter as well as the capacitance.

Posted on Jul 30, 2010

  • 1 more comment 
  • sjbrewy Jul 30, 2010


    It does it air empty or full, which ones the starter compaciter, as on top of the generator part there is a square box and of the side of it are 2 cylindrical units, the top ones a bit smaller than the other. Thanks

  • sjbrewy Jul 30, 2010

    Did you get my responding question.

  • jonesspammai Jul 30, 2010

    No, I didn't get your message, the larger capacitor should be your start capacitor.



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