NH 269 baler making clacking noise

I'm a rank beginner at baling, so this is probably a pretty dumb question--anyway, our NH 269 baler makes a loud clacking sound especially when turning--the sharper the turn, the more and louder the clacking--sounds like its coming from the front, like perhaps the U-joint on the front (drive) shaft.

 

Any thoughts?

NH 269 baler making clacking noise