The function of structure Hydraulic System for Corn Combine Harvester. Self-propelled Corn Combine Picker hydraulic system includes hydraulic pump, steering gear, one-shot valve, multiple valves, hydraulic cylinders, hydraulic tank and hydraulic lines. Hydraulic steering system to ensure the sterring of maize corn machines, lifing the header, combination and separation of the main clutch, speed conversion of variable speed system, lifing the sraw chopper, and the movements of grain tank.