1994 John Deere 653 Feller Buncher

1994 Deere 653 Feller Buncher, Owners unsure on hours, Deere 6068 Engine, No Blowby, Runs Good Good Undercarriage 75%, Needs cutter head work, Saw is moving in and out slowly, Might be a pressure adjustment, Enclosed Cab with Heat and AC, AC does not work.