The present invention relates to the zootechnical field concerning cattle-farming, pig-farming, horse-farming, etc..., and in particular the present invention relates to a cable-driven (2) traction assembly (1) for systems for cleaning floors of the scraper-blade type comprising: a frame (3) for fixing to the ground a drum (4) rotatably associated with said frame, on which said cable (2) is wound a motor reducer (5), arranged for imparting a motion of rotation in just one direction on said drum (4) by means of a drive shaft (6) a command and control unit for said assembly, wherein said traction assembly (1) further comprises: a driven shaft (7), to which said drum (4) is steadily fixed a selectively activatable mechanical-coupling member (8), set between said drive shaft (6) and said driven shaft (7) to enable start or interruption of transmission of the movement from said motor reducer (5) to said drum (4).
