My New Holland 630 round baler belts started crossing over each other. What can I check for to fix this problem? I do not have a manual, but I am sure there is a belt tension adjustment.
If the belts are not within 3-4" of the same length, they need to be. Fill the chamber uniformly from side to side as you make the bale. Belt tension isn't very likely to be your problem if the belts are the correct length.
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