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  1. #1
    Join Date
    Sep 2011

    Default miller thunderbolt noise?

    I have an old miller thunderbolt AC/DC machine. It is considerably more noisy when running on AC than on DC, is this normal?


  2. #2
    Join Date
    Oct 2004
    Edmonton, Alberta


    Its just a noisy machine. you can and should grease the internal shunts and center screw though.

  3. #3
    Join Date
    Dec 2006
    Central Alabama


    I have a 5+ year old Hobart AC/DC. If I remember correctly, the manual says you may need to adjust the shunt screws for too much vibration and noise. I had the opposite problem. My crank was too hard to turn and I loosened each shunt adj. screw about a quarter turn. If your machine has the crank adjustment and it seems real easy to turn, you may need to tighten the shunt screws just a fraction.
    Miller Challenger 172
    Hobart AC/DC Stickmate
    Older Sears AC Stick machine

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