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  1. #1
    Join Date
    Feb 2014
    Location
    Butler, PA
    Posts
    3

    Question Miller XMT 304 Trouble

    I recently purchased a used Miller XMT 304, all of the functions worked when I bought it. The welder sat for 2 months while I rewired the garage for the welders power requirements. During the weekend I got the welder out to do some stick welding. I plugged the welder in and it turned on with no error messages. I set the process selector to "Stick" and the control to "Panel" and tried to adjust the current. The current/voltage control was unresponsive according to the digital readouts. The digital readouts were behaving erratically displaying random numbers and constantly changing even when I stopped trying to adjust the current. When I tried to strike an arc there was nothing, I know I have good cables and leads they are new. I tried other process but the readout was behaving the same way. I tested the outlet and it's fine as well. What's wrong with my welder?

  2. #2
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,670

    Default

    Well first off, make sure its wired properly, you'll have to remove the top cover, black and white input to the side of the top 2 terminals. And only black and white to the plug. NO RED IS USED ON SINGLE PhASE!!!!!

    Then while you have the case open you really want to retorque the output board or just tighten the 5/16 head bolts with a nut driver.

    Then you want to have a looksee and tighten the brass nuts on the inside of the output studs and make sure the pick up wires are attached


    This should take care of your problems, and naturally UNPLUG the unit....

  3. #3
    Join Date
    Feb 2014
    Location
    Butler, PA
    Posts
    3

    Default

    Thanks cruizer. I figured it out after reading through the service manual. It had a 4 prong range (NEMA 14-50) plug on it when I bought it so I just assumed the 4 wires where hot, hot, neutral, and ground. I re-wired the plug eliminating the red wire and now it welds like a champ. I think next time I'll read the manual BEFORE I try to use it.

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