Hobart welder no power

markct

Well-known Member
I got this Hobart welder today, runs but no power output, previous owner had cleaned brushes and said it had some voltage on the 110 terminals but then he tried to flash or polarize it and after that had no current at all. Just curious if anyone knew any common things to check. Has a Ford 200 six cylinder gas engine and says 250 amp output
 
Maybe this time
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I would check for a fuse block. If it was producing AC and he flashed it. Depending on how he did it. He could have blown out the regulator,if it has one. Can you tell me what the model and serial number is. I can try and look it up
 
Thanks, I am pretty mechanical, heavy equipment mechanic and fabricator by trade, but just never worked on a welder like this so no idea what I should be looking at first etc
 
I have the manual from Hobart. Came in this morning. Haven't had a chance to go over it yet. Gotta go feed the cows. Email me I will send it over to you.
 
I have an old generator that needs to be flashed if it sits to long. (Farmall Electral PTO Generator)
I use 2 electric drills to flash the 110 outlet. I always use the same hand drill an old AC steel cased brushed motor from the 60's. Plug old drill into the 110 outlet on the welder. Couple the two drills with a piece of round stock or drill bit. Start the gas engine my case engage PTO. Drive the plugged in drill with the second drill. This usually gets my generator back online. I doubt you could hurt anything trying this.

I have done some other stuff like flashing each leg of the 220VAC and tried doing all three legs of the 3Phase. I've also tried flashing the generator with another gas powered generator wire to wire. That is two male connectors no ground. That worked but took to long and having that cord around seemed like a major liability.
 
The manual for the G-400 tells how to re-excite the generator on page 12. It's a 44 page PDF. I sent the PDF through an OCR program and it came out bad but the below is the gist of it. I don't use this site often besides to buy parts I could email you the PDF if there is an easy way to do that.


-- from the manual (retyped)
If the generator fails to build up voltage after starting,it may be due to the exciter having lost its residual magnetism in shipping or moving of unit.

Maintenance procedure
Raise the exciter brushes and apply an outside source of DC voltage, not in excess of 110 volt for a few seconds to exciter bruhses of opposite polarity (adjacent brushes). This sets up a magnetic field which leaves residual magnetism to cause exciter to build up voltage by itself, when brushes are again lowered into the exciter commutator. If, after the outside voltage has been applied the exciter still fails to generate voltage, reverse the outside voltage through the exciter brushes.
 

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