GRAIN COMBINE HYDRAULIC SYSTEM Russian patent published in 2003 - IPC

FIELD: agricultural engineering. SUBSTANCE: hydraulic system has hydraulic tank, steering control independent system with pressure and discharge hydraulic lines, and main system with pressure and discharge lines. Steering control independent system has hydraulic control equipment, hydraulic cylinder and pump. Main system has pump, hydraulic drives for working tools and hydraulically controlled overflow and safety valves. Hydraulic cylinders for working tools are connected to hydraulic tank through hydraulically controlled locking devices and discharge cavities of three-position distributors for controlling hydraulic drives. Discharge cavity of distributor of hydraulic drive for header part lifting and lowering mechanism is connected to hydraulic tank via one hydraulic line through return valve and hydraulic discharge line of independent system and via other hydraulic line to throttle through discharge cavities of other distributors. EFFECT: increased efficiency and enhanced reliability in operation of working tools of grain combine. 1 dwg