Buddy hooked me up with an HD9 last fall. 1954 vintage. Only problem was one injector and the left side steering clutch is frozen. Undercarriage was pretty new, but the tracks are on backwards. Mine has a Baker blade, but a different model from yours. At least with the Detroit's you can still get parts for them! General Gear has all of the clutch parts for them and also has most of the manuals set up for free download on the bottom of the AC section. I downloaded all of my manuals, including the Detroit manual, printed them laminated the cover and bound them.
Here is a source for Detroit parts: https://dieselpro.com/
And another place i found some manuals to download: https://www.tradebit.com/filesharing.php
Detroit tips on oil : http://www.tejascoach.com/tips.html
Also Discount Hydraulic Hose out of Philly is great for custom hoses at reasonable prices. 50% of what I could get them for locally. They saved me a lot of money on the four 1.25" lift cylinder hoses. Good quality and very fast turn around too. https://www.discounthydraulichose.com/?gclid=Cj0KCQjwg7KJBhDyARIsAHrAXaG3tKOpOJWl-_y6u2o0ZS2E9tvevS5Kgn7FvhLmdr8jJPvptdSBzAIaAkpeEALw_wcB