STRUCTURE AND FUNCTION SOLENOID VALVE SOLENOID VALVE SOLENOID VALVE GROUP ST1 (SERVOCONTROL - PARKING BRAKE - 2nd SPEED) 1 2 3 P Z T A B C S View Z RKS01151 FUNCTION 1. 2nd speed 2. Servocontrol 3. Parking brake A Port To travel motors (PP1 port) B Port To PPC valve C Port To travel motors (PP2 port) P Port From hydraulic pump (E1 port) T Port To hydraulic tank S Port To accumulator 10-47 SK818-5 SK820-5 turbo