The invention relates to a drive system for an infeed conveyor (22) of a harvester (10), having an adjustable hydraulic pump (66), the flow rate and flow direction of which can be adjusted by means of a first actuator (76), said hydraulic pump being connected to a hydraulic motor (68) which drives the infeed conveyor (22). A controller (70) is connected to a foreign-body detection device (108) and to a first valve (90) for controlling the actuator (76) that controls the hydraulic pump (66). The controller (70) controls the first valve (90) at least for a short time by reversing the flow direction is a foreign body appears. In addition, it is suggested that the hydraulic motor (68) has an adjustable displacement volume, and that the controller (70) increases the hydraulic motor displacement volume (68) is a foreign body appears.
