Question about Hobart Handler 125 115 Volt 30 To 125 Amp Arc Single Phase Wire Welding Package #500487

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Handler 125 suddenly started popping the circuit breaker. I replaced the diodes. When everything was back together, I pulled the trigger and heard a chattering noise from inside the box. Pulled trigger again, and popped the circuit breaker. What gives?

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: I have a Hobart 135 Handler wire feed welder that

Get a volt meter, go to ohms setting , check transformer to ground for low to zero ohms reading. also look closely at transformer windings for foreign objects in between them, never know what you my find. If transformer is shorted to ground probably time to say some nice words over it before burial. Also just for kicks try a new gun on it, (there is a reason i'm asking you to do(this) see if you can find someone that has spare. A good honest repair shop would probably be reasonable if all else fails. to a least let you know if the transformers a problem. good luck

Signed
Former Miller Certified Tech.

Posted on Aug 20, 2009

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Please don't give me a bad rating for this. Its just a little extra info. you didn't mention that may help you find the problem. Depending on your specific model, there should be 1 or 2 breakers on the unit it self. If there is only 1, it will shut down the entire machine when tripped. If there are 2, the top one is for the whole unit and the lower one is for the wire feeder motor only. There is also a thermal overload that will shut down everything except the cooling fan. Secure the trigger closed and let the fan run for a while to see if it re-starts when cooled. If the depth of the weld was stable before the problem occurred, I would suspect a short in the motor and not the rectifier. That is not a sure bet though. If the transformer does not start when it cools, UNPLUG the welder and short the transformer to ground to be sure the capacitor is discharged. Then isolate the feed motor and transformer and use an OHM meter to test them individually to ground for a short. With a little luck, it will be the feed motor. Please let me know if this helped at all. I am new and still learning how to explain what I am thinking. Thanks for writing us.
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Could be. Could also be a shorted winding in the transformer. I have seen the aluminum windings burn and melt on some welders.
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