One of the main characteristics of hydrostatic drive based on axial piston hydraulic motor is a control range of rotating frequency of output shaft at rated load. This characteristic is defined by frictional forces stability in kinematic couplings and design features of this type of hydraulic motor. The article considers the structural scheme of the axial piston two-unit hydraulic motor with hydrostatic unloading of cylinder-piston coupling. Preliminary results of the hydraulic motor prototype testing designed according to this scheme are described.