A method for coupling a machine frame of an earth working machine, for example a road miller, stabilizer, or recycler, to a working device between a receiving portion of the machine frame which receives the working device and a substrate with which the earth working machine is in contact, the method encompassing the following steps: - arranging the machine frame and the working device relative to one another in such a way that the working device is located between the machine frame and the substrate; - aligning the receiving portion and working device relative to one another in such a way that fastening formations (56, 60) of the working device are lined up, along a spacing direction having a directional component orthogonal to the substrate, with fastening counter-formations (58, 62), associated with the fastening formations (56, 60) and interacting for operable fastening of the working device onto the receiving portion, of the receiving portion; - bringing the fastening formations (56, 60) and fastening counter-formations (58, 62) closer to one another; and - operably fastening the working device onto the receiving portion characterized in that the aligning step encompasses the following sub-steps: - connecting the machine frame and the working device to one another by means of a connecting apparatus that comprises a frame coupling portion configured for coupling to the machine frame and a device coupling portion arranged at a distance from the frame coupling portion and configured for coupling to the working device, in such a way that the working device is movable in response to its weight, parallel to the effective direction of gravity (g) and orthogonally thereto, relative to the machine frame; then - allowing the working device, movably connected to the machine frame by means of the connecting apparatus, to hang; and then - supporting the working device, wherein the connecting apparatus in the aligned state of the working device extends parallel to the effective direction of gravity (g). - arranging the machine frame and the working device relative to one another in such a way that the working device is located between the machine frame and the substrate; - aligning the receiving portion and working device relative to one another in such a way that fastening formations (56, 60) of the working device are lined up, along a spacing direction having a directional component orthogonal to the substrate, with fastening counter-formations (58, 62), associated with the fastening formations (56, 60) and interacting for operable fastening of the working device onto the receiving portion, of the receiving portion; - bringing the fastening formations (56, 60) and fastening counter-formations (58, 62) closer to one another; and - operably fastening the working device onto the receiving portion - connecting the machine frame and the working device to one another by means of a connecting apparatus that comprises a frame coupling portion configured for coupling to the machine frame and a device coupling portion arranged at a distance from the frame coupling portion and configured for coupling to the working device, in such a way that the working device is movable in response to its weight, parallel to the effective direction of gravity (g) and orthogonally thereto, relative to the machine frame; then - allowing the working device, movably connected to the machine frame by means of the connecting apparatus, to hang; and then - supporting the working device,