This is our 1958 D17 that my Mom and Dad bought back in 1972. At the time my uncle said it was the biggest tractor my Dad would ever need. We were having oil leakage from the hydraulics into the Power Director so we split the tractor to fix the issue. The main clutch pilot bearing had spun on the transmission input shaft so we had to replace it. But on these tractors that shaft that runs between the Power Director and the main clutch and the piston hydraulic pump runs off cams on the shaft so it wasn't a cheap nor simple fix.