I have a hobart 4030D this machine dont have output of voltage in the terminals and output of 127 volts, i cant welding need a solution because is my only machine

I'm not familiar with this particular machine, but in general, I can possibly help. If this is a DC output, AC transformer-type machine, the rectifier assembly may have gone bad (older rectifiers are usually selenium based and will develop high internal resistance over time). If the current output is step switched, the switch may be in trouble. Look for a circuit breaker which may have opened. A wire connection may have failed inside the machine. If this is a motor-generator machine, check the generator brushes for failure. Hope some of this helps!