The invention relates to a device and to a method for pulling a bearing (200) onto a roll journal and for pulling the bearing off the roll journal of a roll. Known devices of this type have a first and a second piston-cylinder unit. Furthermore, said devices have a stop ring (130) fixed in the axial direction A to the end of the roll journal (320) remote from the body as a stop for the inner piston (110) of the first piston-cylinder unit. In addition, the known devices have a nut (150), which can be screwed onto an external thread of the inner piston in order to fix a bearing (200) in the axial direction, in particular during roll operation. As an alternative to the known prior art, the invention provides for a ring-shaped cylinder (120) to be used both as a cylinder for the first piston-cylinder unit and as a cylinder for the second piston-cylinder unit. The cylinder is covered for a short distance on the cylinder's side remote from the body by an annular cylinder cover (122) for the cylinder's function as a cylinder for the second piston-cylinder unit. The cylinder cover (122) serves, in addition to an outer flange (142) of an outer piston (140), for the axial limitation of a pull-off pressure chamber (2) of the second piston-cylinder unit.