A rectangular baler having a wall positioning system. The baler having a bale chamber which includes a plurality of walls including a movable wall section. The wall positioning system includes a positioner for moving the movable wall section from a first position to a second position. The positioner is configured for applying pressure to a first pressure point and to a second pressure point on the movable wall section such that the second position of the movable wall section is substantially parallel to the first position of the movable wall section. The first pressure point and the second pressure point are spaced apart along a longitudinal direction of the bale chamber.
