I think the main difference between the titan 2 and 20 series is that the straw walkers are a bit longer ( 1 foot i think) and the shoe and walker was sped up a bit. Not sure but i think they also increased the fan speed a bit too.
We just got rid of our 2 8820's not titan2 models and had them for 28 years. As long as the previous owner did the maitinance the manual states to do, you should have very little trouble with it. Ours had 5500 hours on one and 4800 on the other one.
Other than the obvious concave, rub bars, feeder chain and elevator chains you could check the augers under the cylinder for bearing wear. We had some trouble at 4000 hour mark and had to replace a few that were really bad and needle greased the others. Check the walker blocks also.
We just got rid of our 2 8820's not titan2 models and had them for 28 years. As long as the previous owner did the maitinance the manual states to do, you should have very little trouble with it. Ours had 5500 hours on one and 4800 on the other one.
Other than the obvious concave, rub bars, feeder chain and elevator chains you could check the augers under the cylinder for bearing wear. We had some trouble at 4000 hour mark and had to replace a few that were really bad and needle greased the others. Check the walker blocks also.
