Vacuum out the housing, as blowing it out with air will only cram debris further into the housing.
The bevel on the brushes needs to meet the contour of the armature. So when you reinstall brushes check the bevel, you may need to seat them using FINE FINE grit sandpaper. (cloth side to armature and grit side to brush, work back and forth until bevel matches). You will know if its right because you won't see arc from the armature to the brush (only a SLIGHT sparkle).
If you don't have 110, you will not have weld output. The 110 comes from the exciter coils and armature. This voltage is the sent to the generator housing coils as a 'flashing current'. Once all that happens it travels thru you rheostat (control) and output stud.
I always tell everyone, the first thing you HAVE to do before starting one that has been sitting for even 6 months, is remove the wrapper (main brush cover), remove the rats nests clean it out, check your brushes and then fire her up.