Operational difference: the non-perpendicularity of the flywheel plane and the crankshaft axis is eliminated, due to which the disk parts have practically no service life limitations with regular replacement of the friction linings. Structural difference:the disc hub is made of 2 main parts, hinged together by means of balls the design automatically during operation eliminates all misalignments between the clutch shaft, pressure plates and flywheel, which is not ensured when operating tractors with hard disks.