machine should be a 05 to have cone and cage updates, 04 machines can be done, has machine combined beans, what shape is feeder in, floor bent uo, feeder chains, what kind of crop will you harvest, smooth slat feeder chains, or sariated chains, other than that useual things that wear out, sieves check them out, are they bent, happens when its to easy to adjust from cab, crap gits inbetween seives and bendes them up and can be a pain, can you sit in cab and open and close top and bottom seives, if you can't actuators have been a problem and spendy, can you open and close concave, just some things to check out, you want the pro 600 monitor, heck of a machine, scott.