After tilling up my garden using my 312-8, I noticed that It would not move after shifting into ANY gear. But by chance I happened to pull up on the shifter and she went into gear.Before this happened, a couple of times the tiller pushed the tractor forward, but I don't think she went too far (I was working the clutch to get a slower forward motion to let the tiller to dig deeper). I read the thread about the fellow that had the shifter come completely out of the gear box. Could it be that the allen set screw came loose (I hope) of is it something more serious? Thanks for your comments.
Dave