silverbill
Guest
Check the springs on the tension adjust to make sure they are both the same length. If they are the same length then I would back the springs off so the feed chain is loose and check for for a bad bearing in the front drum or the rear sprocket shaft. If bearings and springs are OK then you probably have one chain that stretched slightly more than the other. Not much you can do but replace chain. Had this happen on a R55 front chain. Agco replaced chain under warranty and cured problem.