Switchable hydrostatic adjusting device

Hydrostatic adjusting device (8) of a hydraulic machine (1), the swept volume of which can be adjusted by way of a servo adjusting unit (9), having a control unit (10) which has a control cylinder (17) which has at least one inlet (24) for pressurized hydraulic fluid, at least one servo connector (25) for a connecting line (16) to the servo adjusting unit (9), and at least one outlet (26) to a hydraulic fluid collecting region (27), a control piston (18) being arranged in the control cylinder (17), which control piston (18) can be displaced by means of at least one control piston actuator (21) and has control edges (39), as a result of which, in interaction with control edges (38) which are configured in the control cylinder (17), the inlet (24) or the outlet (26) can be alternately connected hydraulically to the connecting line (16), and wherein a prevailing pressure in the connecting line (16) is returned hydraulically via a control line (32) to at least one end side (19, 20) of the control piston (18), characterized in that the control line (32) can be opened and closed by means of a load response valve (30).