The invention refers to an agricultural vehicle (1) comprising a loading chamber (6), a pivotal wall (7), a movable conveyor (5), a wall actuator (9), a conveyor drive (14), and a crop material property sensor (13). The invention further refers to a method for injecting crop material (CM) into the loading chamber (6). The sensor (13) measures a value indicative of a property of the crop material (CM). The wall actuator (9, 14) moves the wall (7) and/or the conveyor (5) moves crop material (CM) away from an inlet (15). Thereby the pressure (P) which is applied onto the crop material (CM) in the loading chamber (6) is reduced. This pressure-reducing step is performed depending on the measured crop material property.
