NH 477 Haybine

Why does the sprocket that runs the bottom roller ( has chain ) keep coming off. Put new half moon key in and I have tighten the two bolts as tight as I can. It just stated coming off. Been running this haybine for years with no issues. Any advice or tips?
 
I used a neighbor's haybine one time not sure f model number but it had similar problem/ I believe it had a straight key though. I suspect the shaft and/or sprocket are worn. On the machine I used I had enough shaft sticking through the sprocket that I could put a lock collar on the outside to keep it in place. Might be an option for you if you have room. Lock collar was just a ring with set screws to lock it to the shaft
 

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