1. SUCTION, DELIVERY AND RETURN CIRCUIT ARM CYLINDER BUCKET CYLINDER BOOM CYLINDER TRAVEL MOTOR P5 P4 Pi2 Rs MU Pi1 Pn1 Pn2 SWING MOTOR PBa P02 PAb1 PDb2 P04 RCV PEDAL P T TRAVEL (4) (1) (2) (3) PAtr PBtr Dr#, dr# SWING ARM P T A1 PUMP PILOT PUMP A2 PUMP SAFETY SOLENOID VALVE (4) (1) (2) (3) P4 a b d e A E D B SH e1 c e2 Psv(Pump) P3 P2 PG(S/Motor) P01(MCV) P(2-EPPR valve) HYDRAULIC TANK PCsp PDs PCs PCa PS P1 PS PS PS PDa PBk LINE FILTER 220S3HC02 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. The return oil flow into the hydraulic tank through return filter. 3-7 3-7 BC1 N RV2 Cck BC2 NRV1 Cco CoR DoR AkR LCk1 LCk2 ION LCo CaR DaR BUCKET BbkR M1 LCa LCa2 ARM2 PAa2 DR6 Ccb M2 SWING P/R LCar LCbk BbR ARM REGEN P02 Abk PBrc PAbk DR4 Cs Ds PCs PDs DR5 SWI P03 DR3 Ctl Dtl PCtl PDtl PattPS ( TR RIG A DR1 P01 PtrPS NG LCs AbR LCb CRb BOOM1 BtR AtR HT) VEL (LEFT) TRAVEL BUCKET P T BOOM P03 P Pu (MCV) (T/Joint) (MCV) (3) (1) (2) (4) F G H J A5 A3 A2 A1 (3) (1) (2) (4) F G H J T