WeldingWeb - Welding Community for pros and enthusiasts banner

1967 Hobart G300

4 reading
135 views 14 replies 4 participants last post by  Cmchase65  
#1 ·
Hello everyone. I'm restoring my dad's old Hobart with a slant six Chrysler Industrial engine. I've got the generator producing electricity, but I'm getting no juice to the welder. There are front bushings and rear bushings. Does one set produce 110, and the other produce power for the welder? I'm stumped. Thanks for any help.
 
#3 ·
There are two DC generators: A small one up front that is called an exciter and produces 110V DC power for brush type tools and excites the large generator that provides welding power. You can get a schematic diagram on line by googling it. The exciter power is regulated by the rheostat dial and the range or welding power is controlled by the “gear shift” wheel that switches in and out 1-4 pole pieces that produce the welding current. If you have 110 V at the exciter, then check for bad connections at the main brushes, the rheostat and the wires at the gear shift wheel.
 
#12 ·
Took the covers off. Not too bad inside. The last time it was used was around 1986. It welded fine then. No bare wires. WD-40'd the brushes. Made sure the springs were putting pressure on them. They were stiff. Will have to dig in deeper. I'm in Florida, so we have dirt dawbers that can make a home anywhere. So, does everyone think it might be just dirty. No adjustments have been made. Got the polarity switch freed up and working. There is continuity between the electrode and the ground. Anything would help. This machine means a lot to me because it was my dad's. I have a photo of my dad standing by it in the 1970's. I'll post it. Thanks everyone!
 
#14 ·
WD40 not the best for that application armatures need to be clean after sitting so long brushes and armature get glazed over and won’t weld
get so 400 grit sandpaper and while it is running clean armatures
then spray them off with electric contact cleaner and let it set before you start it you might wanna check the contacts on the dial and rheostat make sure they are clean
 
#15 ·
WD40 not the best for that application armatures need to be clean after sitting so long brushes and armature get glazed over and won’t weld
get so 400 grit sandpaper and while it is running clean armatures
then spray them off with electric contact cleaner and let it set before you start it you might wanna check the contacts on the dial and rheostat make sure they are clean
Ok. Will do that today. Sounds scary, cleaning armatures while running. Electricity spooks me. Thank you so much! Will keep you updated. I really appreciate your advice!