I have been looking at a 4150 with approx. 3000 hrs. unit is not currently running. Has not been started in 7or 8 years engine was running at that time but am told there was a problem with the hydraulic drive system , a valve or something. part was either replaced or purchased to be replaced and the tractor was never re assembled. dash is out and shuttle shift lever and mechanism are dangling. The person who took the tractor apart has passed away so I would be getting the machine and a box of parts. could someone please advise me on the possible age of this tractor and value in its current state. Thanks