Mike10, Thanks for the reply.The only thing that would wear the side of the clamp is a roll. I just do not remember wearing so evenly. The rolls are retained by a bolt and hub the goes through the frame and into roll bearing support. When the hub breaks or bolt breaks the roll will move forward and can contact the clamp.
Take a prybar and see if any of the rolls move. There should be no movement except for the backlash in the gears. If you are not the original owner the problem may have occurred before you got the baler.
The clamp is a matched pair so do not mix parts. The clamp is machined and then the clamp is broken into the two pieces. So watch you have the broken sections mated correctly.
I managed to get the hub/clamp on, not sure how tight the bolts need to be. The belts are pins, I think.Do yourself a favor and pull the belts. It would not hurt to replace the lacing cables anyway. Unless someone installed steel pins instead of cables you can split the belts in less than 10 min. If you have a roll problem that will make that job easier also.
With the belts out you can position the sledge frame to make installing the clamps Much easier.