A hopper unit (2) is disclosed having a hopper structure (3). A rear wall (8) of the hopper structure is moveable between closed and open conditions. Movement of the rear wall is functionally connected, through a transmission (9, 10), to the movement of the hopper structure (3) between loading and discharge positions thereof. This allows for a controlled, comparably limited path of movement between loading and discharge positions of the hopper structure, while still providing a fixed maximum hopper loading volume and a secure emptying of the hopper load.
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