Mine suddenly quit going around this year and I took the 3 or 4 bolts out of the long triangle shield piece in front of the center belt that is behind the cutter bar, pulled all the stuff out from underneath there, blew it out, found a punch of all things underneath there, and re-aligned that for clearance as I think it is slotted some.

I think it was a 15/16” socket with the nuts on top and carriage bolts underneath.  Don’t quite remember.