Patent ID: 7878291

Claim:
A rear axle steering system for a mobile crane having at least one actively steered rear axle with wheels arranged thereon, comprising: a hydraulic steering system including a first plurality of hydraulic steering cylinders, said first plurality of hydraulic steering cylinders including a centering cylinder and a second plurality of steering cylinders, a said centering cylinder being arranged for centering said at least one steerable axle in the event of an error in said hydraulic steering system; said second plurality of steering cylinders associated with said at least one actively steered rear axle for steering said actively steered rear axle in a desired manner; a braking system configured for individually individual braking of each wheel of said at least one actively steered rear axle; and a control system for actuating said braking system in the event of said error in said hydraulic steering system, so that a predetermined, desired steering position of said at least one actively steered rear axle is achieved by selective braking of at least one wheel of said at least one actively steered rear axle.