Antique Singer Sewing Machine Electrified Cast Iron

  

Antique Singer Sewing Machine Electrified Cast Iron? A motor was added later on. The motor does run, but when I apply the foot pedal it does not turn the belt, it only tenses the belt.

The hand crank turns freely. I know nothing else about sewing. This item is in the category "Antiques\Sewing (Pre-1930)\Sewing Machines". The seller is "murphy-sales" and is located in this country: US.