A row unit (22 122) of an agricultural harvester (10) 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 (28 30) mounted on a frame (32) and having opposed stripping edges which define a gap (34) between them. The row unit further includes a gap adjustment mechanism (36 136) for adjusting a size of the gap between the first and second stripping plates. The gap adjustment mechanism includes a control arm (38) a rocker assembly (40) operatively connected to one of the first and second stripping plates and slidably connected to the control arm and a biasing member (41) for biasing the rocker assembly along the control arm toward a predetermined position corresponding to a predetermined gap size.
