A rotatably mountable track chain roller can have a roller body formed with axle journal stubs formed by casting and forging or machining which are fixed in position in a vehicle frame and which each engage rotatably in an end cap formed as or with a radial and axial bearing.
Moreover the track chain roller has a hollow chamber filled with lubricant material for the bearings which can be sealed from the exterior.
The end caps are fixed in position on the vehicle frame to rotatably support the roll body thereon.
A track chain roller of this type is described in German Utility Model DE-GM 85 23 108.8. There the end caps mounted on the axle journal stubs are attached to one another rigidly, e.g. by a rod which passes through the axle journal stubs and the roll body, so that the track chain roller can be assembled in a unit which can be mounted without disassembly. The desired axial play of the bearing is guaranteed by the rod so that among other things a considerable assembly simplification results, i.e. the difficulty of ensuring axial play is eliminated.
U.S. Pat. No. 4,594,846 describes the use of a wear degradable material to ensure axial play in a track pivot pin.