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  1. #1
    Join Date
    Feb 2010

    Default Maxstar 150 STH probs: post flow gas stutters instead of smooth flow

    Hope you all can help. I've had my 150STH for at least a couple of years now and never had a problem with it. Just this past week or so it has started doing this funny thing where when I let off the pedal instead of hearing the post flow gas come out all smooth you can hear the welder itself making a little stuttery sort of ticking noise and you can see the affect of the gas pulsing out on the weld instead of coming out in a stead, smooth stream. If I look at the needle on my bottle valve I can see it jittering also. Looks like the affect you'd see if a valve wasn't seating or a contact wasn't opening or closing cleanly. EDITED TO ADD: Just took a real close look/listen, and it sounds like it is actually the bottle valve that is making the noise, so maybe the valve is sticking? It has been rather cold in Indiana the past week or so, but my shop area is fairly well heated in that I am comfortable in a couple of layers of clothing. The cold shouldn't affect it the valve, should it? I don't think it's cold enough for that, but thought I'd throw that in as well.

    Also, tonight just a few minutes ago I was welding and let off the pedal and the welder didn't shut off. The post flow gas kept stuttering power kept coming to the tungsten. I shut it off and restarted it and it was fine again.

    I am using a non-Miller foot pedal and welding using 110 current if that should make any difference.

    I don't know if these two things are related, but figured it was worth mentioning.

    I'd like to get this fixed before it brings me to a halt. I'd rather fix it while I'm prepared to deal with it than when I'm in the middle of needing to get something done and it suddenly becomes a big hassle.

    Thanks in advance!
    Last edited by gearhead69; 01-28-2014 at 07:45 PM.

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