The invention refers to an agricultural vehicle (1) comprising a loading chamber (6), a moveable part (5, 7), an actuator (9, 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 actuator (9, 14) performs or enables a movement of the moveable part (5, 7). Thereby the pressure (P) which is applied onto the crop material (CM) in the loading chamber (6) is reduced. The actuator (9, 14) performs the movement depending on the measured crop material property.