Welcome aboard, The l2's and l3's are great work horses and run a long time with proper care. We have two l2's both with 7500 hrs and a friend has a l3 with 8500 hrs. I would agree with Tom and get the manuals. Of course I could list 101 things to check, but a place to start would be to check chains, sprockets, belts, bearings, cyl. bars and concave. We usually check things over from header to spreader and the books would be a great resource. Where are you from in the wheat and milo countryIJIJIJ I hope this helps you get started. Happy Harvesting!!