Went and looked at a 91 or so JD 650 dozer with a 6 way blade. Starts great, runs great, power shift transmission works good, brakes work good. Has 3 shank ripper. 2000 hrs. Was used to clear mesquite and fences after it came off lease. Current farmer has had it since 1993.

Paint is faded and has some surface rust but overall it looks good. No broken windows! A/C works!

Undercarriage looks ok to me although I can tell some wear on the sprockets. Pins and bushings etc look good. Don't know much about what to look for and don't know anyone around here that would know. 

What would something like this be worth?