A HYDRAULIC DRIVE SYSTEM

摘要

A hydraulic drive system comprises a plurality of wheels drivable by hydraulic motors (19, 20, 21) from a source of hydraulic pressure (15). The torque supplied by at least one of the motors (21) is arranged to be varied relative to the torque of at least one of the other motors (19, 20) in dependence upon the operating pressure generated by the hydraulic source (15).