1. SUCTION, DELIVERY AND RETURN CIRCUIT 1. SUCTION, DELIVERY AND RETURN CIRCUIT pc6 pb3 pb7 pc2 pa7 480A3HC02 The pilot pump receive oil from the hydraulic tank. The discharged oil from the pilot pump flows to the safety solenoid valve through the line filter. The oil is filtered by the line filter. The pilot relief valve is provided in the pilot pump for limiting the pilot circuit pressure. The oil filtered by line filter flows remote control valve through safety solenoid valve and cross assy. Also, the oil flows 3-cartridge valve, swing parking solenoid valve, main control valve and flow control 2-EPPR valve.
The return oil from remote control valve returned to hydraulic tank through cross assy.
3-7 3-7 DA R M RB U C K E T C Y L IN E R C Y L IN D E S W IN G M O T O R ps1 T3 T1 T2 T4 ps2 pa11 DR1' DR1 pc1 T R A V E L M O T O R B5 A5 pb5 ARM 1 pa5 B4 A4 pb4 pa4 OPTION A3 B3 pb3 B2 pa3 BOOM 2 A2 pb2 SWING DR3 pa2 B1 pc6 TRAVEL(LH A1 pb1 pa1 pr1 TRAVEL(RH) TRAVEL STRAIGHT TRAVEL P T P1 PSPT PP PA PH PS (2) (1) (4) (3) pa6 pb6 pb1 pa1 CROSS ASSY NG P T ARM BUCKET P T BOOM P1 T1 P2 T2 MA 1 P U P3 T3 P T dr# ) (3) (2) (4) (3) (1) (2) (4) A B D E F G H J F PH (T/JOINT)(MCV) c b d1 d e2 e f1 f g g1 h h1 j j1 A5 A2 A1 P4 Pi(D/C VALVE) 2 PS pa2 PS PS PS PS PS PS P3 PP(MCV) Td# P2 P(2-EPPR) P pb5 pb9 B CA (Td#)T P1 H Y D R A U LIC T A N K pa5 pc1 pa9 pb8 pa11 pa8 pa3 LINE FILTER A5 pb5 ARM 1 pa5 B4 A4 pb4 pa4 OPTION A3 B3 pb3 B2 pa3 BOOM 2 A2 TRAVEL(LH TRAVEL STRAIGHT A6 pb6 pa6 ) P3 P2 Y T1 T2 MA 1 P U T3 dr# Pi(D/C VALVE) PP(MCV) Td# P(2-EPPR) H Y D R A U LIC T A N K FILTER T ARM (2) (4) B D E ) (3) A (3) (1) (2) F G H J c 2 PS pa b d1 d e2 e f 2 PS PS PS 1 f g g1 h PS h1 j j PS P pb5 pb9 B A C pa5 pc1 pa9 pb8 pa11 pa8 CROSS ASS P1 P2 P3