Abstract: A method is for operating an axial piston machine whose displacement volume is continuously adjustable using a double-acting control cylinder having two oppositely acting control chambers. The method includes providing a corresponding axial piston machine. An electrically adjustable pressure control valve is connected to one control chamber. Another control chamber is connected to an electrically adjustable 3/2-way switching valve. The method includes providing a target control pressure difference. A zero case is defined as a case in which the target control pressure difference is essentially zero. A positive case is defined as a case in which the target control pressure difference is positive. A negative case is defined as a case in which the target control pressure difference is negative. The method further includes calculating a first and a second control pressure. A case differentiation includes determining whether the zero case, the positive case, or the negative case is present.

Abstract: A pump assembly has a displacement volume that is continuously adjustable by a double-acting control cylinder having first and second control chambers, to which first and second receiving bores, respectively, are assigned. A pressure control valve in the form of a built-in valve is installed in one of the receiving bores and a 3/2-way switching valve in the form of a built-in valve is installed in the other of the receiving bores. The pressure control valve and the 3/2-way switching valve are each electrically adjustable and are connected to a control device. A target conveying pressure difference can be specified to the control device, and the control device is configured such that, by controlling the pressure control valve and the 3/2-way switching valve, the control device adjusts the displacement volume so that the difference between the first and second actual pressures approaches the target conveying pressure difference.