Where are your transit vanes setIJ Have you inspected them to see if you might have some which are badly worn or maybe have a couple of them folded overIJ Assuming, since it's a 1440 model, that you have a standard grain rotor, are you using straight or sawtoothed stripper bars over the rear gratesIJ Sawtoothed strippers will fight the vanes in vine crops and hold trash in longer than necessary, requiring vines to build up small slugs before the vanes can force trash to the rear. This usually haappens without much loss in rotor speed. Hope this makes sense.