Just bought my first a couple of weeks ago. This is what I learned ... check block for welds or cracks, check oil for water, make sure hand clutch, foot clutch, pto and lift work, the three point hitch makes it more valuable if it is a good one and not just something cobbled together, check the shifter lever for play and run through all the gears ... my lever is out being rebuilt. Tires are a major expense on a tractor ... check rims too, is it converted to a 12 volt? steering tightness. I probably missed something, hope this helps. I guess price for tractor value is the major consideration.