3. COMBINED SWING AND ARM 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 900L3HC22 When the swing and arm functions are operated simultaneously, the swing spool and arm spools 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 A1 pump flows into the swing motor through swing spool and the arm cylinder through arm 1 spool. The oil from the A2 pump flows into the arm cylinder through the arm 2 spool of the right control valve. The upper structure swings and the arm is operated.
3-24 ps1 T3 T1 T2 T4 ps2 pa11 pa10 DR1 pc1 B5 A5 B9 pb9 pb5 A9 ARM1 pa5 ARM2 pb9 PO B4 B8 4,2) A4 A8 P2 B AB 11 OPTION BUCKET A 4,1) DR7 DR2 pc7 pc2 A3 B3 p pb3 ARM1 pa5 PO B4 4,2) A4 P2 B B1 OPTION A A1 4,1) DR7 pc7 A3 B3 pb3 pb9 ARM2 B8 A8 BUCKET DR2 pc2 p