I'll "second" what Steve says. These tractors are great work horses. I love our 2072!
A couple of things to look for...
1) Grab a 9/16" socket wrench, and a 9/16" box wrench when you go to pick it up and give a tug on all of the bolts that mount the tranny to the frame. As long as they're kept tight, you won't have problems, but if the pervious owner let them get loose you could have a stripped out bolt hole in the transmission case. Been there, done that!
2) Check the hoses that lead from the engine to the remote oil filter on the right side of the engine.
If they leak, they can be fixed, but they're not cheap. Again, been there, done that!
3) As with any auto or piece of machinery, slide underneath it and look for any signs of leakage from the engine and transmission. These tractors aren't specifically known to be "leakers" but it's nice to know what you're working with BEFORE you get it home.
Don't let my comments above scare you away from these tractors. They are awesome work-horses and very comfy to run. <font size="-2">(Here is an old pic of ours when it had the soft-cab on it)</font>