Printing medium feeding means of a hydraulically actuable shift element

There will be a pressure medium feeding means of a hydraulically actuable shift element (K1, K2) have been proposed, comprising at least one of a pump (4) and with a duct (3) for pre-filling of the switching element fluidly connected to the pressure medium feed channel (1, 2), wherein in the pressure medium feed channel (1, 2) between the switching element and the switching element valve (6, 7), an additional pressure-maintaining valve (9, 9 ') and a non-return shutter is integrated, so that this idle direction of the pressure medium feed channel (1, 2 ) is closable, wherein the pressure retaining valve (9, 9 ') is designed such that an emptying of the switching element or a venting of the pressure medium feeding means is made possible.