Mobile crane

Details Mobile crane Mobile crane

B - Operations, Transporting

62

D

180/54

B62D 5/10 (2006.01) B62D 7/15 (2006.01)

Patent

CA 1040543

ABSTRACT OF THE DISCLOSURE A rough terrain mobile crane in which the operator's control cab is mounted on a rotatable superstructure has all the controls grouped in the cab including a mechanical, pre- ferably power assisted, steering system mechanically engageable when the cab is in a road travel position, an hydraulic steer- ing system is alternatively engageable for on-site use and includes and separate directional control valve for steering road wheels on one of the axles, for example utilizing the power assisted part of the mechanical steering; the hydraulic system is water locked, or may free wheel when applied to the mechanically steered wheels, when not in use for road travel and four-wheel manoeuvering during craning operations in on- site use is provided without any occasion for undesirable build up of hydraulic pressure.

237039

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