I love machines, but haven't worked on many with success. Given that, it looks to me like that motor is on there crooked. It seems to me that the drive wheel should be level to the machine.
Like I said, I'm not that experienced and I've never seen one of those machines in person. I find that most mechanical objects are logical. That drive wheel at that angle doesn't seem logical to me. It just doesn't look "right". What would be the purpose of it being that way? It would not give you the most efficient drive mechanism. That "seam" on the back of the motor doesn't seem like it should be slanted to the side that way either.
bkay