1.
SUCTION, DELIVERY AND RETURN CIRCUIT 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 A(FW) B(BW) DR2 DR1 DR1 DR2 A(FW) B(BW) ARM CYL EXTENSION CYL DOZER CYL 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 Pa10 Pb8' DR2 Pa8 Pa8 Pa6 Pa7 Pa4 Pa5 AC Pa3 Pa1 Pa2 DOZER MAIN CONTROL VALVE Pb10 T2 Pb6 Pb7 Pb4 Pb8 Dr1 BU Pp1 T1 Pb3 Pb1 Pb2 TRAVEL DOZER Pb5 R/H L/H 2 4 3 1 DOWN 1 2 UP A B C D 7 B/SWING Pb6 Pa6 Pb7 Pa7 2WAY OPT BOOM SWING BUCKET ARM Pb1 Pa1 E SAFETY 2-SPEED ACC A1 A2 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 T Pa3 Pb2 Pb3 Pa2 Pb4 Pa4 Pb5 Pb10 Pa10 Pb8 E SOLENOID VALVE K4 TR Pa5 Pa8 HYD TANK S1 MAIN PUMP 189AK3HC03 The pilot pump receive oil from the hydraulic tank.
The discharged oil from the pilot pump flows to the safety solenoid valve. The pilot relief valve is provided in the solenoid valve for limiting the pilot circuit pressure. The oil flows remote control valve, MCV and swing port through safety solenoid valve. The return oil flow into the hydraulic tank. 3-7 B10 A10 BUCKET A9 B8 BOOM B7 A7 P1 P2 A6 B6 A5 B5 A4 B4 TRAVEL(LH) TRAVEL(RH) ARM PTO P3 B3 A3 B2 ARM SWING CROWD A2 B1 A1 BS MRV-P2 MRV-P1 MRV-P3