FIELD: transport and road building machinery; hydraulic systems of tractors, materials handling and other mobile machines. SUBSTANCE: proposed hydraulic system has variable-capacity reversible pump, hydraulic distributors, hydraulic motor, hydraulic cylinder, proportional spool valve with electric control, pump cradle position transmitter, pump working space pressure transmitter, proportional spool valve control device. Inputs of proportional spool valve and pressure transmitter are connected with main line which is connected to piston space of each operating mechanism of hydraulic system, and output of proportional spool valve is connected drain. Inputs of control device are connected with outputs of pressure transmitter and pump cradle position transmitter, and output of device is connected to control input of proportional spool valve. EFFECT: enlarged operating capabilities of system, reduced power consumption. 1 dwg
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