Question about Bobcat Miller 225 Welder Generator 907209 Or 907210

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I have a miller bobcat 225 is lower power while welding, any idea?

When im welding engine slow down like shuting off, electrode dont have enought power to weld i have to put it away from metal in order to the engine get back to normal. and the same action repeats over and over when in trying to weld, what can be possible to make it work normal?

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  • hubiam
    hubiam Nov 09, 2016

    First of all remove the outside, panels, pre-spray with Simple Green at full strength all cables, trays, components, and engine; let soak 5-10 minutes depending on weather and humidity. Then pressure spray down the unit with clear water. Drip or air dry thoroughly. Get a CREE quality high output LED inspection light, inspection mirrors, knee pads, work light, pen & paper, and inspect the "crime scene" for details. In my thousands of hours experience with hundreds of these units, the following Eight Curses leading to premature failure of otherwise fine Miller Electric machines have impaired their unit's: Mice, mud, corrosives, other harsh chemicals, wasps, salt, rust, and industrial impact incidents. If those factors aren't enough for you to find a possible cause, permit me to say I have encountered a few humans who might not be the brightest. May the good Lord help them find work that they would excel in.
    Scour the enire unit and even photograph all of the possible angles. Celebrate the problems you encounter as wonderful challenges to optimize your long term care of this unit.
    What am I going to zero in on? The volt sense cable running from the inside mount of your weld output. If it is not secure, if it is corroded chewed on by mice, or possibly loose, then address that. I have found multiple problems there that nobody can warranty.

    Now, If you can read a Service Technician's manual and schematics & circuit diagrams, then e-mail me at with your units 2 letter, 6 number serial number and I will send you a free PDF for that unit pro bono. That means free, not $55. $55 is what Miller charges for those and they are the best service manuals in the industry.

    Hey, I know how it is to operate when the funds are short and the service shop wants $90 TO $120 JUST TO LOOK AT IT. The manual will provide all of the necessary Miller Electric part numbers for you to order from them or any of their fine dealers nearby. Let me know if anything good comes from that or if you have more questions.



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  • Contributor
  • 35 Answers

First off, check all of your welding cables to make sure they're in good shape, then check for tight cable connections. Is your machine staying at low idle speed while trying to weld? If so, Switch the idle select into the 'weld' position and make sure the high RPM's initiate. Try welding again. Better? Could be a number of things, if not.

Posted on Jan 02, 2015


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: battery location.......dahhhhhhhhhh

Hi Louis, the battery sits on the bottom of the unit, just inside the rear right side service door.
if you were to look at the machine from the back, it would be located right in the middle on the bottom of the unit.

Posted on Jul 02, 2010

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SOURCE: Bobcat Miller 225 won't start.

Check the oil safety switch maybe it is bad. It will stop running if low on Oil or wont start.

Posted on Feb 19, 2011

  • 407 Answers

SOURCE: Why is my bobcat 225 not welding hot enough?

If all your settings are correct and still not hot enough probably your fuse F1 is open and need to replace. Check page 42 of the owner's manual for instructions.

Hope this fix your problem.

Posted on Nov 30, 2011

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If this was useful please vote.

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Miller bobcat 225g plus welding problem

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