4.
COMBINED SWING AND BUCKET OPERATION TRAVEL MOTOR-LH TRAVEL MOTOR-RH SWING MOTOR PP L/H R E D R E D R/H R E D 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 SOLENOID SELECTOR BUCKET CYL BOOM CYL D B C A G H F E T P TURNING JOINT C2 C3 C1 C4 P2 P1 3WAY VALVE 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 Dr1 BU Pp1 T1 Pb3 Pb1 Pb2 Pb8 Pb5 TRAVEL DOZER R/H L/H 2 4 3 1 DOWN 1 2 UP A B C Pb6 Pa6 Pb7 Pa7 Pb1 Pa1 E D SAFETY 2-SPEED ACC A1 A2 7 B/SWING LH 1 2 RH 2WAY OPT LH 1 2 RH BOOM SWING LH 1 2 3 2 RH IN OUT UP DOWN OUT IN BUCKET ARM 4 4 1 3 P2 K3 K1 K2 T P1 P2 P3 P4 P1 K4 TR Pa3 Pb2 Pb3 Pa2 Pb4 Pa4 Pa5 Pb5 Pb10 Pa10 Pa8 Pb8 E SOLENOID VALVE HYD TANK S1 MAIN PUMP 189AK3HC33 When the swing and bucket functions are operated, simultaneously the swing spool and bucket spool in the main control valve are moved to the functional position by the pilot oil pressure from the remote control valve.
The oil from the P3 pump flows into the swing motor through the swing spool. The oil from the P1 pump flows into the bucket cylinder through the bucket spool. 3-26 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