Just look it over close and look for, cobbled up wiring, run it and listen for unusual noises , check the belts, worn out mower lift linkage, cracks in the mower and tractor chassis, tires (weather cracks, worn out thread) If you can bring a small jack check the steering linkage and for loose wheels. It is all depends what you are looking for, a almost new or a fixer up? What you are paying for that tractor you sure don't want to spend a lot of money on it after you get it home. Parts are big money.