5.
COMBINED SWING, BOOM, ARM AND BUCKET OPERATION TRAVEL MOTOR-LH TRAVEL MOTOR-RH L/H R E D R E D R/H SWING MOTOR R E D PP DR PP PP ARM CYL EXTENSION CYL DOZER CYL A(FW) B(BW) DR2 DR1 DR1 DR2 A(FW) B(BW) STOP VALVE B(CW) A(CCW) T D B C A G H F E T P TURNING JOINT SOLENOID SELECTOR 3WAY VALVE BUCKET CYL BOOM CYL C2 C3 C1 C4 P2 P1 B/SWING CYL DR2 Pa8 Pa10 Pb8' Pa6 Pa7 Pa4 Pa5 AC Pa3 Pa1 Pa2 DOZER Pb10 T2 Pb6 Pb7 Pb4 Dr1 T1 Pb3 Pb1 Pb2 MAIN CONTROL VALVE Pb8 Pb5 BU Pp1 TRAVEL DOZER DOWN UP R/H L/H 2 4 3 1 1 2 Pb6 Pa6 Pb7 Pa7 Pb1 Pa1 A B C D SAFETY 2-SPEED ACC A1 A2 7 B/SWING 2WAY OPT BOOM SWING BUCKET ARM E K1 K2 LH 1 2 RH LH 1 2 RH LH 1 2 3 2 RH IN OUT UP DOWN OUT IN 4 4 1 3 P1 P2 P3 P4 P2 P1 K3 TR T Pa3 Pb2 Pb3 Pa2 Pb4 Pa4 Pb5 Pb10 Pa10 Pb8 E SOLENOID VALVE K4 Pa5 Pa8 S1 MAIN PUMP HYD TANK 189AK3HC34 When the swing, boom, arm and bucket functions are operated, simultaneously each spool in the main control valve is moved to the functional position by the pilot oil pressure from the remote control valve.
The oil from the P2 pump flows into the arm cylinder through, arm spool. The oil from the P1 pump flows into the boom cylinders and bucket cylinder through the boom spool, bucket spool. The oil from the P3 pump flows into the swing motor through the swing spool. The superstructure swings and the boom, arm and bucket are operated. 3-27 B10 A10 BUCKET A9 B8 BOOM B7 P1 P2 A7 A6 B6 A5 B5 A4 B4 P3 B3 A3 B2 ARM SWING CROWD A2 B1 A1 PTO ARM TRAVEL(RH) TRAVEL(LH) BS MRV-P2 MRV-P1 MRV-P3