Check your helical bars for ware if they are wore down the straw will not keep moving smoothly. There are also some extra helical bars that you can put in if you do not have them. They are listed as a Ediable Bean Kit. They are short bars that go in the top of the cage to finish the loop. The books say they are needed for slow cyl. speeds, but they make a large differance in all crops. Much less rumbling and a lot less power used. I used part of the used bars that I took out. Just cut the ends to fit if they are still good. (I did need new bars anywhey)