I am looking at making a bid on a JD 770 (1989) . It has 1022 hrs. on it and all it has ever done is cut grass with a 5 ft. finishing mower. However , it has been setting up for 2 / 3 years but it is being cranked every few months. I need advice on how much it may be worth and if it could be hurt from sitting up so long. The outside is in great shape but needs a new seat. It has been kept in a shed. It has turf tires and weights on the front, no equipment. Any additional advice on this tractor would be greatly appreciated. Thanks in Mississippi