A row unit of an agricultural harvester is disclosed for the automatic adjustment of a gap size of the row unit stripping plates. The row unit includes first and second longitudinally extending stripping plates mounted on a frame and having opposed stripping edges which define a gap between them. The row unit further includes a gap adjustment mechanism for adjusting a size of the gap between the first and second stripping plates. The gap adjustment mechanism includes a control arm, a rocker assembly operatively connected to one of the first and second stripping plates and slidably connected to the control arm, and a biasing member for biasing the rocker assembly along the control arm toward a predetermined position corresponding to a predetermined gap size.
