Abstract: A hydraulic tilting mechanism for a driver's cab of a vehicle, with the mechanism including a double-acting working cylinder having accommodated therein a displaceable piston. Ducts or lines are provided for connecting the working cylinder with a supply tank or source of hydraulic fluid, with a pump being arranged in one of the ducts or lines and a joint control valve for controlling a movement of the piston being arranged in the ducts or lines. A closable duct by-passes the working cylinder and branches off from a three-way valve having two switch positions. The three-way valve is located in the duct or line leading to a first cylinder space which causes a tilting of the driver's cab. The three-way valve is adapted to be electromagnetically switched by way of a key. The closable duct or by-pass line discharges into a connecting duct or line arranged between the control valve and a second cylinder space which is adapted to cause a return of the driver's cab.