Hi - I recently purchased a late model series III N7 and am very happy with the condition at only 1531 separator hours. However, the cage sweep was removed and have been told this is common. I was starting to be dirty behind the machine and couldn't get it clean. The next day when I was servicing I opened up the doors ahead of the engine and the cage was packed extremely full of chaff and straw. What do I do to keep this from happening with no cage sweep?