GROUP 5 COMBINED OPERATION 1.
OUTLINE 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 L/H 2 1 7 B/SWING Pb7 Pa7 2WAY OPT SAFETY 2-SPEED ACC A1 A2 K1 K2 LH 1 2 RH LH 1 2 RH P4 P2 P1 K3 T Pb2 Pa2 Pb4 Pa4 SOLENOID VALVE K4 TR MAIN PUMP 189AK3HC30 B10 A10 BUCKET A9 B8 BOOM B7 P1 P2 A7 A6 B6 A5 B5 PTO A4 B4 P3 B3 A3 B2 ARM SWING CROWD A2 B1 A1 ARM TRAVEL(RH) TRAVEL(LH) BS MRV-P2 MRV-P1 MRV-P3 SST PER O E V O C E LL L TA O R DOZER H 3 4 DOWN UP 1 2 Pa6 Pb6 Pb1 Pa1 SWING ARM BUCKET BOOM LH RH OUT IN IN OUT UP DOWN 1 3 2 4 3 1 2 4 Pb3 Pa3 Pb5 Pb10 Pa10 Pb8 Pa5 Pa8 The oil from the P1, P2, P3 pump flows through the neutral oil passage, bypass oil passage and confluence oil passage in the main control valve.
Then the oil goes to each actuator and operates them. Check valves and orifices are located on these oil passage in the main control valve. These control the oil from the main pumps so as to correspond to the operation of each actuator and smooth the combined operation. INDEPENDENT TRAVEL SYSTEM This independent travel system for straight travel is provided in the main control valve. If any actuator(s) on P1 and P2 pump side is operated when traveling, the travel selector spool is moved to the selected side by the pilot oil pressure. Consequently, the pressure oil from P1 and P2 pump are supplied to the right and left travel motor and oil from P3 pump flows into the other operated actuator.
This keeps the straight travel. 3-23