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  1. #1
    Join Date
    Jun 2012
    Posts
    11

    Default Millermatic 150 gas won't flow?

    How do I trouble shoot the gas not flowing to the tip of my Millermatic 150. I've got plenty of gas in the cylinder and I've turned the flow up and down..and I can see the "flow gauge" needle bump(tiny movement) for a second when I depress the trigger but it doesn't show a flow rate like it once did, and wire is coming out etc..but zero cloaking gas? I can hear a clicking in the machine when I pull the trigger..and expect the gas..but none coming out.

    Is it the cylinder gas gauge assembly? Or some part of it. Or is it the liner or something in inside the machine. Wire comes out fine, just no gas.

    Pretty new to welding..appreciate your help.

    Tom

  2. #2
    Join Date
    Feb 2012
    Location
    Wa
    Posts
    578

    Default

    I would disassemble and check out the regulator.

  3. #3
    Join Date
    Dec 2011
    Posts
    401

    Default

    Disconnect the gas hose at the machine and check for gas flow from the hose. If you have it there, the problem is in the machine, if not work your way back to the cylinder.---Meltedmetal

  4. #4
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,842

    Default

    9 times out of 10, its your mig gun end not fully inserted into the machine drive connection, the other 1% its debris stuffed in the inlet screen where your gas hose connects

  5. #5
    Join Date
    Jun 2012
    Posts
    11

    Default

    Thanks for all the suggestions. I'll give them a try.

    Tom

  6. #6
    Join Date
    Jun 2012
    Posts
    11

    Default

    I disconnected the black rubber gas hose where it attaches up front by the wire roller and goes into the welding cable, and when I depress the trigger I get a momentary puff of gas and then just a tiny flow of gas thereafter.

    I went to the back of the machine and get the same puff of gas coming out of the gas valve and then just a tiny amount of gas..but when I check gas coming into the valve it seems to be a constant flow.

    I'm guessing the Miller 218422(the part I've found on line??) gas valve needs replacing? Does that seem correct?

    Tom

  7. #7
    Join Date
    Dec 2011
    Posts
    401

    Default

    Look at Cruizer's post above. Find the screen on the inlet to the machine I guess and clean it first before you buy anything.---Meltedmetal
    Last edited by Meltedmetal; 11-19-2014 at 04:27 PM.

  8. #8
    Join Date
    Jun 2012
    Posts
    11

    Default

    Quote Originally Posted by Meltedmetal View Post
    Look at Cruizer's post above. Find the screen on the inlet to the machine I guess and clean it first before you buy anything.---Meltedmetal
    OK will check that.

    I've looked everywhere but don't see anything on the machine that looks like an "inlet screen"..The hose from the tank fastens into the valve at the back of the machine and nothing there. I've separated the valve itself into the electric solenoid being one part and the plastic housing that allows the gas to flow, but no screen there.

    Where would the screen be? I can't find it.

    Thx
    Last edited by tomget; 11-19-2014 at 11:36 PM.

  9. #9
    Join Date
    Dec 2011
    Posts
    401

    Default

    You have verified that the gas is flowing to the machine with the hose disconnected?
    The screen should be inside the inlet to the solenoid valve body I would guess. It will be very small if that's where it is. What do you see if you look into the inlet?
    Can you manually activate the valve with it disassembled? Does the gas flow?---Meltedmetal

  10. #10
    Join Date
    Oct 2004
    Location
    Edmonton, Alberta
    Posts
    7,842

    Default

    Remove the gas hose at rear of machine then look in at the gas soliniod. There may be an inlet screen in there. This screen likes to plug up. Thus burst of gas then slows down to nothing.

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