FIELD: mechanical engineering. SUBSTANCE: vehicle gearbox hydraulic system includes gearbox hydraulic drive system and mounting control hydraulic system and hydraulically coupled oil tank, suction pipeline, pump and distributor. System is furnished additionally with safety and make-up unit connected by feed and drain main lines with distributor of mounting control hydraulic system and by control and make-up main lines with gearbox hydraulic drive system. Gearbox case has electromagnetic valve installed on outlet oil line and oil level transmitter opening electromagnetic valve to drain excess oil. Ejector is installed in suction pipeline of pump of mounting control hydraulic system. EFFECT: improved efficiency, reliability and increased service life of gearbox by provision of conditions for efficient functioning. 2 cl, 1 dwg
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