STRUCTURE AND FUNCTION CLSS 3.3 THE FUNCTION TO SWITCH SERIES CIRCUIT TO PARALLEL CIRCUIT Function (1) Low bucket load: Series circuit (2) High bucket load: Parallel circuit Depend on bucket load, a circuit can change automatically as above. Then the machine gets high speed and strong digging power. 2 a F 3 H d 4 b A c P1 Q1 P2 D B C 1 Q2 P3 5 6 f e E G 7 RKS00730 10-43 SK818-5 SK820-5 turbo