I need info on a Miller big 40 gas driven continetial early 80's machine.How easy to replace rectifier or is it the restat. This unit has small flat head 4 cylinder with updraft carb. Is the year close to style it is or is it an older machine? Any help will be greatfully excepted
The miller big 40 was built from the 70 s well into the eighties they are a good welder for heavy fabrication and guaging , they are not a pipeline welder, big 40s are known to have rheostat problems when used in the higher range setting at less than 50% if it has sat for a long time it could have brush issues I don't know if diode failure is common . Any welder repair shop should be able to diagnose the problems quite quickly, A good working machine should be worth $1800 - $2500 in the repair industry
Thank you I have decided not to get it .The repair bill would be to high for me.
just wanted to make sure I didn't miss lead you. The machine should be worth 1800-2500 in good running order . the repair cost for brushes would be about $200 if the shop put them in , rheostat about 150. parts 100 labor , diodes can be more :beatsmepricey
No you didn't. It just made it better aware of what I was getting into.Besides I don't have anything to lift it or place it on a trailer.
Tripod and chain falls - then back under