well, let's see, feeder chains get about 600 hrs 800 hrs or so and you replace the bottom boot of clean grain elevator also the augers. This is about when you re the unloading augers.. 1200 or so and the feeder house upper bearings, shaft and sprokets are toast along with the drum in front.. 1500 hrs or a little more if you can stand it,the cyl. bars and concave need changed.. In the middle of all this I re'd the main countershaft bearings and replaced the shaft since it was bent. 2200 hrs and the hydo went out. did all the augers again a little before that.. first set of front tires shelled out here too.. Re'd the walker wood bearings here.. 2700 hrs the steering motor shelled and of course deere in all it's wisdom saw fit to update the part so it cost about a thousand bucks to fix... Got about 2900 now and ready to go again. As you can see, this is not a cheap toy to run, but if you fix every durn thing it needs (a lot of the fixes I haven't put in here because it gives me a headache) before you get to the field it is good for about the whole harvest for me w_o falling apart once. About 200 hours. Every thing on it that turns has been replaced at least once. Still like it too.. shell about 1000 bu_hr of corn if you have wagons enough. Good luck freind!!