Abstract: A variable displacement hydraulic motor has a motor housing with a fluid inlet and a fluid outlet. A pair of hydraulic displacement units are mounted in the housing in a parallel arrangement and are operatively associated with a common output shaft. The common output shaft is supported for rotation within the housing and has a pair of spaced ends extending outside the housing, one of the ends driving a first axle shaft and the other end driving a second axle shaft. Each motor unit has a rotatable cylinder block with reciprocable pistons communicating with the fluid inlet and the fluid outlet and an angularly positionable swashplate for varying the stroke of the pistons. A minimum-maximum servo regulates the position of each swashplate independently to provide a wide range of output of the hydraulic motor.

Abstract: A method and apparatus for repeatedly testing wire rope and sheaves under simulated operating conditions is disclosed. The testing apparatus is capable of simulating many conditions under which wire ropes and sheaves are used in actual practice with cranes or the like including adjustments for varying rope tension, rope speed, sheave speed, sheave off-lead angles relative to the rope and to allow reverse bending of the rope. Sheaves of different diameter and different rope size and materials may be tested.