A power steering mechanism for a wheeled vehicle comprises a transverse piston rod fixed to a frame secured to the front axle beam, a double-acting hydraulic cylinder slidable on a piston fixed on said rod, and a lever pivotally connected between its ends to the cylinder, connected by ball joints at one of its ends to respective track rods, and pivotally connected at its other end to a fulcrum at the free end of a substantially transverse link pivotally mounted at its other end on said frame. Oil is supplied selectively to the respective ends of the cylinder via flexible hoses and drillings in the piston rod.
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