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 PCtl PDtl PBtr Dr#, dr# SWING ARM BUCKET BOOM P T P T A1 PUMP PILOT PUMP A2 PUMP SAFETY SOLENOID VALVE P (T/Joint) Pu (MCV) (4) (1) (2) (3) A H G F E D B J (4) (1) (2) (3) P03 (MCV) A5 A1 A2 A3 P4 P01(MCV) a b d e f g h j h2 PS d1 c e2 h1 PS Psv(Pump) P3 P2 PG(S/Motor) P(2-EPPR valve) HYDRAULIC TANK PCsp PAk PDs PCs PCa PS PAb1 PBb1 T P1 PS PS PS PDa PBk LINE FILTER 330S3HC02 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 BC1 NRV2 Cck DR9 Co P05 Do PCo PDo OPTION Ca Da BC2 NRV1 Cco CoR AkR LCk1 LCk2 DoR LCo CaR DaR BUCKET BbkR DR7 CRa PaL ARM1 LCa LCa2 ARM2 PAa2 DR6 Csp Db2 BOOM2 Ccb SWING P/R LCar LCbk BbR ARM REGEN P02 Abk PBrc PAbk DR4 Cs Ds PCs PDs DR5 SWING P03 DR3 Ctl Dtl PCtl PDtl SH Patt ( TR RIG AVH ET) PS DR1 P01 PtrPS TS Cs Ds PCs PDs DR5 SWING LCs AbR LCb CRb BOOM1 P03 DR3 Ctl Dtl PCtl PDtl Patt (RIGHT) TRAVE DR1 BtR AtR L (LEFT) TRAVEL