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Miller big 40 starts and stopd after a few secvonds

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  • flo flo Nov 18, 2009

    installed new carb need help adjusting carb and gov linkage

  • Bruce Hathcock May 11, 2010

    what di it do? stop welding stop feeding wire stopped running more information please.


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Low oil sensor?

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Same as "my car won't start" Gotta start finding then problem. If I had a magic wand, I'll help you.

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hi, you have 2 big resistor with ajustable tab on it,check for visual damage on it and rusted connector or tab,
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I have a Miller big 40 bout an 87 modle that runs and welds great but wont idle down. Any thoughts?

There is a solenoid that controls the idle speed and the run speed- it is stuck in run speed. It may be a binding linkage, it may be bypassed by a previous owner.Chances are, as the idle relay is controlled through a load sensor on the control board and it may simply be a wire is off, damaged, or the solenoid is stuck.

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I just started up a Miller Big 40 welder after 18 years, it runs like a charm, but the 110 plug is dead and there is no arc when trying to weld.

After 18 years, the welder has either lost its residual magnetism (which allows the output voltage to ramp up) or the voltage regulator is defective. Another possibility would be the brushes for the field not contacting the rings like they should - damaged brushes or weak springs. Contact Miller/ Hobart for a service manual, these checks are relatively easy to perform. The manual will give you specs that can be used for go or no go testing.

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Have a Miller big 40 welder and the engine won't turn over

I'm not familiar with this particular unit--do you mean to say that the cooling system froze during the winter? If so, and the engine has overhead valves, the cylinder head, block, or both may have cracked causing water to leak into the cylinders which would have rusted the rings and cylinder walls (together). You are looking at major overhaul or even engine replacement (not what you were hoping). Good luck!

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My 88 model big 40 isnt generating. where do i start

check you gfci outlets first those seem to go.

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check the ground ,make sure is tight.look around the machine and see if theirs a switch or a nob to turn from mig to arcweld...

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