6.
COMBINED BOOM AND TRAVEL OPERATION ARM CYLINDER BUCKET CYLINDER BOOM CYLINDER ARM CYLINDER BUCKET CYLINDER BOOM CYLINDER SWING MOTOR SWING MOTOR ps1 T3 T4 ps2 ps1 T3 T4 ps2 T1 T2 T1 T2 TRAVEL MOTOR TRAVEL MOTOR pc1 pc1 pa9 pa9 pa5 pa5 pa11 pa11 pb8 pb8 A7 A7 pa8 pa8 TURNING JOINT TURNING JOINT B7 pc2 B7 pc2 pb3 pb7 pa3 pa7 pb3 pb7 pa3 pa7 pc7 pc7 pc6 pc6 A6 B6 A6 B6 PT PS P1 PT PS P1 P2 PH PA PP PS SH P2 PH PA PP PS SH A1 A2 A1 A2 FRONT PUMP REAR PUMP PILOT PUMP FRONT PUMP REAR PUMP PILOT PUMP HYDRAULIC TANK HYDRAULIC TANK 900L3HC25 When the boom and travel functions are operated simultaneously, the boom spools and travel spools in the main control valve are moved to the functional position by the pilot oil pressure from the remote control valve and the straight travel spool is pushed to the right by the oil pressure from pilot pump.
The oil from the A1 pump flows into the travel motors through the LH travel spool of the left control valve and the RH travel spool of the right control valve via the straight travel spool. The oil from the A2 pump flows into the boom cylinders through the boom 2 spool and boom 1 spool via the parallel and confluence oil passage in case boom up operation. The boom is operated and the machine travels straight. 3-27 (34,2) P2 B B A A (34,1) D ARM1 pa5 PO B4 A4 1 OPTION 1 R7 pc7 A3 B3 pb3 pb9 ARM2 B8 A8 BUCKET DR2 pc2 p