5. COMBINED SWING AND TRAVEL OPERATION ARM CYLINDER BUCKET CYLINDER BOOM CYLINDER SWING MOTOR TRAVEL MOTOR TURNING JOINT PT PS P1 P2 PH PA PP PS SH A1 A2 FRONT PUMP REAR PUMP PILOT PUMP HYDRAULIC TANK 900L3HC24 When the swing and travel functions are operated simultaneously, the swing spool 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 straight travel spool is pushed to the right by the pilot oil pressure from the 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 swing motor through the swing spool via the straight travel spool. The upper structure swings and the machine travels straight. 3-26 ps1 T3 T1 T2 T4 ps2 pa11 pa10 DR1 pc1 B5 A5 B9 pb9 pb5 A9 ARM1 pa5pa5 ARM2 pb9 PO B4 B8 4,2) A4 A8 P2 B AB 11 OPTION BUCKET A 4,1) DR7 p Da R8 2 pc7 pc2 A3 B3 p pb3 pa5 4,2) P2 B B A A 4,1) D ARM1 pa5 PO B4 A4 1 OPTION 1 R7 pc7 A3 B3 pb3 pb9 ARM2 B8 A8 BUCKET pa8 DR2 pc2 p