The plough (1) has a frame (6) on which a beam (8) is mounted by a casing (9). The beam has a rotational axle (12) at its front end, where the axle is supported against a bearing (13) arranged in the casing. The beam is maintained against the casing by a tie rod (14) forced in traction by the action of a double-acting jack (15). A beam raising device (16) voluntarily raises the beam by pivoting around an axis corresponding to the rotational axle. The beam raising device has a maintaining system (17) that maintains the axle against the bearing.
