STRUCTURE AND FUNCTION HYDRAULIC PUMP FUNCTION Discharge port 7 6 B A 2 Discharge side A Suction side A Suction port RKS00161 Charge pump is connected to HST pump shaft by coupling (2), so inner roter (6) and outer roter (7) rotate. When inner roter (6) and outer roter (7) rotate, capacity of A increase and oil is sucked, and capacity of B decrease and oil discharge. 10-28 SK818-5 SK820-5 turbo