Is this the machine?
CAT D9R, Serial Number: 7TL01393
Enclosed Cab, Air Conditioner, Heater, 14’ Wide Semi-U Blade w/ Single Cylinder Tilt, Differential Steering, 30" Single Grouser Track Shoes, Counterweight
Price: USD $44,500
Auction: Thu, March 14, 2019
Condition: Used ROPS: Enclosed Iron Planet Ecorse, Michigan
Last time I ran numbers on a complete undercarriage for one of these it ran about $90,000. Auction and asking prices are all over the boards for these machines. It is a great core for rebuild but only a few places attempt them at this point in time. Fix the leaks, change fluids and filters, remove the pans and clean everything out and finally put a paint job on it. You could probably ask $150K and give your self a year or so with moderate marketing expenses.
You could also lease or rent it and get a continuing payment and probably make more. But then again you will have operational risks that go along with that type of income.