In order to repair this drill, it had to be disassembled to remove the armor and field.
When testing the armor with the growler or growler, it was detected that it had some shorted coils and that armor was rewound.
Likewise, the field had the coils burned since they looked very dark and they were also rewound, changing the insulators, then varnished with electro-insulating varnish and tied with cotton thread so that the coils do not vibrate.
Finally I made the connections the right way and put the whole set together to test it and it turned out very well.