LEVELLING SYSTEM COMPRISING A SCREW ACTUATOR

A levelling system (1) for levelling an operating unit (10), such as a loading platform of a motor vehicle or a cab, with respect to a ground plane (P). The levelling system comprises a screw actuator (3) comprising:- an outer cylinder (35) connected in motion to the operating unit (10);- a shaft (4) configured to rest on the ground plane (P) and translatable with respect to the outer cylinder (35), having extension mainly along a shaft axis (S);- a threaded maneuvering screw (5) which is rotatable and translatable along a main axis (X) of the outer cylinder (35) ;- a guide spiral (6) screwed to the threaded maneuvering screw (5);- a hinge assembly (7) configured to swing the shaft (4) with respect to the guide spiral (6).