Question about Miller 907547 Bobcat 250 Diesel Welder Generator With Gfci

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No welding current

Have ac output, receptacles work--no welding current

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Miller Bobcat(Gas)machine AC output to aux. power receptacles, does not meet required voltage. Only 70% required voltage 120 and 240.


On a Bobcat, the big knob needs to be turned all the way up to 10. If it is, then the engine speed (RPM) might be too slow at fast speed.

Apr 01, 2017 | Miller Welding Tools

1 Answer

I have a Lincoln welder 255 square wave an I can't regulate the amperage


weld current output regulation on this machine is usually accomplished by voltage supplied across a 50 milli volt shunt that is usually connected at one end of the main rectifier, if this shunt fails, or if the connections are loose or damaged, you will not have current control, your control board may also have some issues
Upon removing the machine covers, if there is no easily seen damage, it will be best to seek out and take it to an LASF for repair.

Sep 01, 2015 | Lincoln Electric K1297 AC/DC 225/125 Stick...

1 Answer

Ranger 10,000 has low weld output and ac output


This is not a simple question. Take this magnificent machine to a service shop.

Aug 25, 2014 | Lincoln Electric Ranger 250 GXT AC/DC Arc...

1 Answer

If I turn the ac dc switch while what dose it do to the wielder. Now im not getting any juice to wield .thank you


Changes between AC and DC voltage at the electrodes.



Q: What Type Of Stick Welder Works Best For All-Around Use?

A: A welder with an AC/DC output, whether its an electric arc machine like Miller\'s Thunderbolt or a gas engine drive like Miller\'s Bobcat.

DC welding offers advantages over AC for most Stick applications, including: easier starts; fewer arc outages and sticking; less spatter/better looking welds; easier vertical up and overhead welding; easier to learn "how to weld" and a smoother arc. DC reverse polarity (electrode positive) provides about 10 percent more penetration at a given amperage than AC, while DC straight polarity (electrode negative) welds thinner metals better.

Q: Does An AC Output Have Any Advantages?

A: Yes, if you need to weld on material that\'s become magnetized from friction, such as when hay, feed or water constantly rub against a steel part. A DC output won\'t work because of "arc blow," where the magnetic field blows the molten filler metal out of the weld puddle. Because an AC output alternates between polarities, it enables you to weld magnetized parts.

Aug 19, 2014 | Computers & Internet

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Miller bobcat 250


remove the side doors, and top cover, make sure your brushes are making correct contact against the slip rings, there is a flat mounting panel behind the range control switch, you will see 2 white fuses in their holders, check these fuses, one controls AC output the other controls weld current output.

May 19, 2014 | Welding Tools

1 Answer

The settings for welding aluminium using a Tig200P AC/DC inverter


If you are using a remote then you would set the machine in standard for controlling output and also to AC output, HF tig, contactor and control in remote position. I don't know if this helps or not but I pulled it from an owners manual.


1/16" (.062) - pre-flow .1 sec., hot start 20, amperage 70, Hz 100, balance 20%, post-flow 6.0 sec.

For pulse settings - set pulse width 60%, peak current 100, background current 30, Hz 1.0

1/8" (.125) - pre-flow .1 sec., hot start 20, amperage 150, Hz 80, balance 20%, post-flow 6.0 sec.

For pulse settings - set pulse width 60%, peak current 150, background current 50, Hz 1.0

3/16"-1/4" - pre-flow .1 sec., hot start 20, amperage 185, Hz 60, balance 20%, post-flow 8.0 sec.
For pulse settings - set pulse width 60%, peak current 185, Background current 125, Hz 1.0

Mar 14, 2014 | ARC Thermadyne Inverter Stick/TIG Welder...

1 Answer

Hi, I recently purchased a used makita 6100r generator and when checking it out I discovered on my 30 amp 220 receptacles arent getting full power. I took out the receptacle and checked the wires in back...


You may be asking too much of the unit; the 5800 watts a which it is spec'd, may be a 'peak' power rating which may be 15-20% higher than its continuous rating. 30 Amps at 220 volts implies 6600 watts which is higher than even the peak power rating. I would expect the unit to produce ~4800 watts continuous or around 22 Amps.
Decided to check my statements and found this, which I quote:
Generator Volts AC (60Hz) 120/240 Max. Output Current 5800W-48.3A/24.2A Rated Output Current 4800W-40A/20A Volts DC (AMPS) 12 (8.3)

Aug 28, 2011 | Makita G6100R 5800 Watt Generator

1 Answer

No or little ac output


By ac you mean receptacles, not ac welding? 
If so what about welding output on AC (DC)?

If welding is OK then you may have breaker or fuse problem.
If welding output is also low or no output your problem is the generator.
You should check your gen rpm to be normal. If so you may have field problem: rectifier, AVR etc.
If you can measure the field DC voltage at rated rpm, if it is missing (very low) try to find any circuit broken.
If you do not succeed answer this instruction in order to give you more.

Jul 20, 2010 | Lincoln Electric Ranger Gxt 250 Amp...

1 Answer

My lincoln ranger 250 no weld output


sounds like the transformer winddings which generate the amperage for the arc are breaking down

Jul 03, 2010 | Lincoln Welding Tools

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