FIELD: agricultural engineering. SUBSTANCE: hydraulic system has tank connected to pump, pressure and discharge lines, and electromagnetically controlled unit of distributors. One of distributors is furnished with hydraulically controlled locking device having two cavities, piston and locking valve. Hydraulic system has actuating hydraulic engines of different energy capacity. Device with two pressure levels is connected in series with pressure line and discharge cavity of said device is connected with tank through discharge line. Safety valve of device with lower adjustment pressure in operating position of distributors is joined with cavity of hydraulically controlled locking device free of locking valve or with hydraulic engine of lower power capacity. EFFECT: reduced probability of overpressure and reduced power consumption by employment of two pressure levels and increased efficiency. 1 dwg
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