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  1. #1
    Join Date
    Feb 2007
    Location
    asheville n.c.
    Posts
    618

    Default miller 251 tb problem

    Machine will run, when I strike up an arc, the machine idles down til it barely runs, and barely welds. What is the problem?

  2. #2
    Join Date
    Mar 2014
    Location
    Texas
    Posts
    54

    Default

    Let me see if I understand. When you strike an arc the machine bogs down almost to the point of stalling and will barely weld?

    Kohler or Onan engine?
    Does the machine sound like it's under a hard load or does it sound like the engine is just quitting?

    If the machine sounds like its under a load, you have a short.
    If it's the engine...Kohler. might have a push rod off or the jets in the carb are fouled.
    Onan..jets in the carb fouled.

    Really need more info.

  3. #3
    Join Date
    Oct 2007
    Location
    Cave Creek Az
    Posts
    965

    Default

    Does it run on high, or idle. If on idle, does it idle up when you switch to run. Check the air filter? Oil? Carb linkage? Dashpot?

  4. #4
    Join Date
    Feb 2007
    Location
    asheville n.c.
    Posts
    618

    Default

    It can run on high idle as soon as I strike arc it pulls it down acts like it's going to die. It's the Onan engine. One time it ran wide open but couldn't hardly get arc out of it

  5. #5
    Join Date
    Oct 2007
    Location
    Cave Creek Az
    Posts
    965

    Default

    Assuming all the linkages move freely, including the pivot point/spring return arm (mine froze up at one time), then i am guessing water in the fuel. Pull the carb bowl and cheek it out.

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