According to the present invention mechanical system for tilting cab of a vehicle, the rotational motion of the detachable handle (12) is transmitted to the worm shaft (14) through the engaging clip (15). The worm shaft (14) rotates the worm (11) which in turn rotates the nut (10). The nut (10) being restrained for translational motion, pushes the screw (9) upward. The screw (9) gets a translational motion and is raised. The clevis joint (8) on the top of the screw (9) forces the link arm (7) upwards. The link arm (7) also rotates about the clevis joint (8) due to the revolute joint. The linkarm (7) transmits this motion through the bush (13) and the bush bracket (6) to the suspension bracket (3) of the cab (1). As a result the cab (1) tilts about its transverse axis (5).