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  1. #1
    Join Date
    Sep 2012
    Posts
    14

    Default 1970 Miller big 40 will start up but won't weld any help out there

    My 1970 Miller big 40 will start up and run but won't weld now. Just got done doing some work to the motor but didn't really touch the generator side of it except that I put a new range selector switch in it. Not sure what's wrong was welding before got the switch with the welder old 1 was really lose so put the new 1 in. Not sure what I could have done to cause it not to weld any help would be appreciated thanks

  2. #2
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,453

    Default

    Well, if the unit was working before the switch, and now it doesn't, it might occur to you that you did something wrong.

    Needless to say, I can't help you

  3. #3
    Join Date
    Sep 2012
    Posts
    14

    Default

    Ok thanks. Anybody else might know what may cause a machine to run but not weld.

  4. #4
    Join Date
    Oct 2006
    Posts
    642

    Default

    Quote Originally Posted by jwd_88 View Post
    Ok thanks. Anybody else might know what may cause a machine to run but not weld.
    The advice given before was sound.

    If in fact the machine was working properly prior to any work being done and immediately after the work was done it fails to function a strong suspect would be the newly installed part.

    Now if the machine was welding fine a year before the new switch was put it and was not tested just prior to the switch install, there is a good chance of something else gone wrong.

    I have no knowledge of the machine you speak of, but do have over 35 years experience troubleshooting and repairing electrical/electronics problems.

  5. #5
    Join Date
    Oct 2006
    Posts
    642

    Default

    What kind of work did you do to the motor?

    Was it removed from the unit for the work to be done?

  6. #6
    Join Date
    Aug 2008
    Location
    Orange, TX
    Posts
    1,162

    Default

    I'd start by double checking the selector switch wiring comparing what you have to what is shown in the manual wiring diagram or any diagram you may have on the inside of the machine.

    Do you have a unit SN instead of just that it's a 1970?
    MM200 w/spot controller and Spoolmatic 1
    Syncrowave 180 SD
    Bobcat 225G Plus LPG/NG w/14-pin*
    *Homemade Suitcase Wire Feeder
    *HF-251D-1
    *WC-1S & Spoolmatic 1
    PakMaster 100XL
    Marquette "Star Jet" 21-110

  7. #7
    Join Date
    Sep 2012
    Posts
    14

    Default

    No the motor was left in the machine for the repairs. I replaced the oil pan gasket. Pulled the head to remove the distributor due to the fact it was stuck in place. Replace distributor so timing might be of some which would mean I'm not getting the correct RPM's. I rewired the starting and charging system following the diagram I have. Then I replaced the selector switch and that's it. The machine is a 1970 Miller big 40 gas operated serial number 70 dash 543296 stock number 900 955. The motor is a f163 4 cylinder Continental thanks for the feedback guys.
    Last edited by jwd_88; 11-22-2012 at 02:33 AM.

  8. #8
    Join Date
    Aug 2008
    Location
    Orange, TX
    Posts
    1,162

    Default

    Not sure why I bothered to ask you for the unit SN as I knew it was too old to download the manual from the Resources section.

    So, can you post a good quality photo of any wiring diagram you may of the unit? I need to confirm something before making my next suggestion.
    MM200 w/spot controller and Spoolmatic 1
    Syncrowave 180 SD
    Bobcat 225G Plus LPG/NG w/14-pin*
    *Homemade Suitcase Wire Feeder
    *HF-251D-1
    *WC-1S & Spoolmatic 1
    PakMaster 100XL
    Marquette "Star Jet" 21-110

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