General craftsman tiller gearbox question.
Ages ago in the early 90's, I bought a Craftsman 5hp rear tine tiller. It had the B&S engine on it. For some reason, Sears modified the housing for the pull starter rope, and the rope was not a replaceable option. So I gave Sears all of the pertinent numbers and ordered the housing with pull starter.
Six months later, they notified me that the part was in, and upon pickup, found that a washing machine part, with my part number, was sent.
Once the proper part had been shipped and installed, the engine, after running a while, started spitting sparks and went south. It has sat outside since until this spring.
I bought a new Honda 6 HP engine and put it on, cleaned everything as best I could and started the tiller up. All works except the wheels don't engage. This is a model that allows Forward, Forward and Till, Reverse, or Neutral to be selected. I have searched everywhere trying to find a manual, or anything on Craftsman Tillers, but they don't seem to exist. The large wheel on the side of the gearbox is belt driven, but I have no idea what's inside.
Can anyone give me a clue as to where I might find firstly, a repair manual for the gearbox, and secondly, what might be inside and might be the problem(gear, belts, shear pins) and thirdly, how are these usually opened? I certainly don't want to return it to Sears for repair after the original parts fiasco.
I realize that without numbers, the exact procedures might not be accurate, but I was hoping to just get an idea until I can get the numbers and return.
Thanks for any help.