Now all of this information is just my opinion. When you say large, do you mean D series ? If you do, then the condition means a lot as far as value, and then comes the extras like a rear PTO and 3-point Do they run? But a junk D series 160 180 and 200 series is worth 2 to 4 hundred, and a real nice loaded up one can bring as much as 3000.00. Now if you are talking D250, well that's another ball game, The D250's in junk condition 3 to 6 hundred and a nice loaded up one maybe 25 to 32 hundred. and if you have one with a loader, well the loaders them selves can bring 1200 to 1600 .