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  • wire feed not working

    just bought this welder (millermatic 135) , wire feed motor not working . I put a new potentiometer dial on it , still not working . feed motor turns freely . I noticed a red light on the circuit board came on when I pushed the trigger on the gun .does that mean the board is BAD ??? Is there a way to check the pc board ? Any body run into this , and is there anything else I should check . Thank You

  • #2
    Welcome, Stinson. Afraid I can't be much help with the welder-diagram is just a big blank block for the circuit card, and I don't have a 135 to look at. But I'm sure interested in your screen name--a true classic! One of the smoothest things in the sky!

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    • #3
      Originally posted by stinson108 View Post
      just bought this welder (millermatic 135) , wire feed motor not working . I put a new potentiometer dial on it , still not working . feed motor turns freely . I noticed a red light on the circuit board came on when I pushed the trigger on the gun .does that mean the board is BAD ??? Is there a way to check the pc board ? Any body run into this , and is there anything else I should check . Thank You

      My Net Flix movie isn't holding much of my interest, but your question has my short term attention. Post a serial number. Don't think however that means I know something, I don't, but I'm sure it'll help someone who does know something with a better chance of answering?

      If I was a guy who pretended to know something...I might asked, you say the drive is not working but the motor turns freely? Tell me you did something to discover this out? And since I have you on the line, you got no speed or some speed?

      Now for advice...I don't think your going to find a magic internet cure. But if you start searching the forum for past topic posts of such troubles, internet for videos, what you discover is some pretty solid tips for testing and checking. Just curious, did you disassemble the drive gear box clean and lube it up? Add a drop of oil to each end of the motor? Confirmed liner isn't kinked or filled with friction slowing gunk? Does the fan work?

      Good luck, it's not an uncommon problem. But if I was to guess, you can narrow it down to three things. two of which could be parts on the board, or the "Board". The other...I'd only be guessing and what you need is to test stuff.

      Pictures were from the inside of a Hobart 135. Like I mentioned, no magic internet cure found, a bunch of reading, a few video's, just a little cleaning, a little maintaining, and some testing.
      Your welcome.

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      • #4
        AERONCA41.... Just so happens I got my sport pilots license in a aeronca champ (1947) . And getting my private license in the Stinson. Love taildraggers !!!!

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        • #5
          Noel ... I will post the serial number when I get home .
          I did take the motor apart and clean and lubed everything .
          Thank you I will research some more and test .

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          • #6
            Most likely it's the PC board. Don't take the motor apart. Get a meter, disconnect the wires to the motor and check for 12 VDC across the wires. If it isn't there it's your board. Make sure your heat setting isn't in between #'s. Board failure is mostly cause by drive rollers cranked down too tight on these small machines. I've seen 1 motor failure to 100 board failures.

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            • #7
              Looks like there are at least 2 different part numbers for that board. You'll have to check your machine's serial number, get the proper manual from the SUPPORT link above if you don't already have one, find the part number of the board, and then call Miller for an updated part number since the ones in the manual are no longer available. Looks like 207463 or 207466 in a random serial number manual I looked at. 207466 has been replaced by 226321; not sure about the other one. Looks like $250-$300 bucks or so. Talk with Miller at 920-734-9821. Check at Miller4less.com for pricing once you get a good part number. Miller does not provide schematics to fix the board except to their authorized service folks.

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