The incline auger in your grain tank. If that is worn out, it will not keep up with grain coming up the elevator. I had problems with my slip clutch this year. It already had washers behind the three springs. I bought two new ratchets and three springs. I may have gotten by with the old ratchets after finding out one spring was broke. The new springs were longer, so that meant the old springs had lost some of their tension. I also found out that you do not want to grease the slip clutch. If you are running elevator chains with the poly paddles, check and make sure you have not lost any bolts. We also found this problem and lock tighted each pair of bolts on each paddle.