A baler, comprising a housing and a pressing chamber enclosed by the housing, into which chamber cardboard packaging, waste, earth or other objects can be filled for the compaction thereof, comprising at least one pressing ram which is axially movably mounted in the housing and which enters the pressing chamber and in so doing presses the objects together to form a bale, comprising a hydraulic circuit by means of which the pressing ram is driven in the direction of the pressing chamber and moved back into its initial position, the pressing ram consisting of a tube which is supported on a support plate held on the housing and in which a pressure piston which has a T-shaped cross section is axially movably mounted, a carriage which is associated with the open end of the pressure piston and is fastened to the pressure piston, and a stationary cylinder which surrounds the pressure piston and the carriage, characterized in that the tube and the cylinder are fastened to the support plate connected to the housing, in that the support plate and the tube form or enclose a first pressure chamber (R 1), in that the support plate, the outside of the tube, the first free surface of the carriage and the inside of the cylinder form or enclose a second pressure chamber (R 2), in that the outside of the pressure piston, the second free surface (23") of the carriage and the inside of the cylinder form or enclose a third pressure chamber (R 3), in that an opening (15, 16, 17) which is connected to the hydraulic circuit is incorporated in each of the three pressure chambers (R 1, R 2 and R 3), in that the hydraulic circuit is operated from three pump and suction devices (12, 13, 14) which operate independently of one another and, depending on the position of the pressing ram, is controlled by means of a control device, and in that the hydraulic fluid can be pressed or sucked alternately into the pressure chambers (R 1, R 2, R 3), in each case independently of one another, by the pump and suction devices (12, 13, 14) of the hydraulic circuit. in that a pump (31, 32, 33) and at least one control valve are provided in each pump and suction device (12, 13, 14), by means of which pump and valve the hydraulic fluid from a storage container enters the relevant pressure chamber (R 1, R 2 or R 3) or is sucked or pressed out into the storage container. comprising at least one pressing ram which is axially movably mounted in the housing and which enters the pressing chamber and in so doing presses the objects together to form a bale, comprising a hydraulic circuit by means of which the pressing ram is driven in the direction of the pressing chamber and moved back into its initial position, the pressing ram consisting of a tube which is supported on a support plate held on the housing and in which a pressure piston which has a T-shaped cross section is axially movably mounted, a carriage which is associated with the open end of the pressure piston and is fastened to the pressure piston, and a stationary cylinder which surrounds the pressure piston and the carriage, characterized in that the tube and the cylinder are fastened to the support plate connected to the housing, in that the support plate and the tube form or enclose a first pressure chamber (R 1), in that the support plate, the outside of the tube, the first free surface of the carriage and the inside of the cylinder form or enclose a second pressure chamber (R 2), in that the outside of the pressure piston, the second free surface (23") of the carriage and the inside of the cylinder form or enclose a third pressure chamber (R 3), in that an opening (15, 16, 17) which is connected to the hydraulic circuit is incorporated in each of the three pressure chambers (R 1, R 2 and R 3), in that the hydraulic circuit is operated from three pump and suction devices (12, 13, 14) which operate independently of one another and, depending on the position of the pressing ram, is controlled by means of a control device, and in that the hydraulic fluid can be pressed or sucked alternately into the pressure chambers (R 1, R 2, R 3), in each case independently of one another, by the pump and suction devices (12, 13, 14) of the hydraulic circuit. in that a pump (31, 32, 33) and at least one control valve are provided in each pump and suction device (12, 13, 14), by means of which pump and valve the hydraulic fluid from a storage container enters the relevant pressure chamber (R 1, R 2 or R 3) or is sucked or pressed out into the storage container.