Earth working machine having a rotatable working apparatus axially positionally retainable with high tightening torque by means of a central bolt arrangement, and method for establishing and releasing such retention

An earth working machine, comprising:

• a machine frame;
• a drive configuration rotationally drivable relative to the machine frame about a drive axis, the drive axis defining an axial direction;
• a milling drum connected to the drive configuration such that rotation of the drive configuration transfers torque to the milling drum for rotation of the drive configuration and the milling drum together about the drive axis for earth working, the milling drum extending axially between a drive axial end and a retention axial end located oppositely from the drive axial end;
• a bearing stem attached to one of the drive configuration and the milling drum, the bearing stem protruding in a first direction to a first axial end, the bearing stem having an outer surface including at least first and second cylindrical bearing surfaces axially spaced from each other, a furthest one of the cylindrical bearing surfaces from the drive axial end having a smaller diameter than a next furthest one of the cylindrical bearing surfaces from the drive axial end;
• and
• a non-locating bearing assembly connected to the machine frame and including a non-locating bearing and an inner bearing support supporting an inner bearing ring of the non-locating bearing, the inner bearing support including a central opening including first and second inner cylindrical surfaces configured to receive the first and second cylindrical bearing surfaces of the bearing stem.