I own a 2006 Massey 9220 with a 2006 5200 header, this header has been giving me grief and is getting rough so I purchased a 2009 5200 header off a newer model swather but can't get it to work. The attachments look the same, I have it all hooked up the header lifts, reels lift, fore and aft works but I can not get the knife to engage or the canvasses. The knife will move a couple of inches and quit, same with the reels. Is there something I need to do to get it working? Please help if you have any ideas.