Electrohydraulic steer-by-wire steering system, comprising: an operator interface for specifying a steering angle, said operator interface being assigned a sensor for sensing a position and/or movement of the operator interface, an electronic control device which is connected to the sensor and is connected to a first electrohydraulic circuit and a second electrohydraulic circuit, wherein the control device is designed to activate the two electrohydraulic circuits (46, 48) depending on the signals of the sensor, and a steering actuator for adjusting the steering angle of a steerable wheel, wherein the steering actuator has two chambers (38, 36) which, in a normal operation of the steering system, are both simultaneously connected to the two electrohydraulic circuits (46, 48), wherein the electrohydraulic circuits (46, 48) each comprise an electric motor (50, 68) which is controlled by the control device, is reversible in direction of rotation and drivable at a variable speed, and a hydraulic pump (54, 72) which conveys hydraulic fluid in the two directions of rotation and the connections of which are connected or are connectable to one chamber (38, 36) each of the steering actuator, characterized in that the connections of the hydraulic pumps (54, 72) are each connected by the non-return valves (58, 64, 78, 82) assigned to them to the chambers (38, 36) of the steering actuator, and in that the steering-actuator-side connections of the non-return valves (58, 64, 78, 82) arranged between the connections of the hydraulic pumps (54, 72) and the chambers (38, 36) of the steering actuator are connected to in each case a first connection of a shut-off valve (98 to 104), the second connection of which is connectable or is connected to a storage tank for hydraulic fluid. an operator interface for specifying a steering angle, said operator interface being assigned a sensor for sensing a position and/or movement of the operator interface, an electronic control device which is connected to the sensor and is connected to a first electrohydraulic circuit and a second electrohydraulic circuit, wherein the control device is designed to activate the two electrohydraulic circuits (46, 48) depending on the signals of the sensor, and a steering actuator for adjusting the steering angle of a steerable wheel, wherein the steering actuator has two chambers (38, 36) which, in a normal operation of the steering system, are both simultaneously connected to the two electrohydraulic circuits (46, 48), wherein the electrohydraulic circuits (46, 48) each comprise an electric motor (50, 68) which is controlled by the control device, is reversible in direction of rotation and drivable at a variable speed, and a hydraulic pump (54, 72) which conveys hydraulic fluid in the two directions of rotation and the connections of which are connected or are connectable to one chamber (38, 36) each of the steering actuator, characterized in that the connections of the hydraulic pumps (54, 72) are each connected by the non-return valves (58, 64, 78, 82) assigned to them to the chambers (38, 36) of the steering actuator, and in that the steering-actuator-side connections of the non-return valves (58, 64, 78, 82) arranged between the connections of the hydraulic pumps (54, 72) and the chambers (38, 36) of the steering actuator are connected to in each case a first connection of a shut-off valve (98 to 104), the second connection of which is connectable or is connected to a storage tank for hydraulic fluid.