2.
SAFETY VALVE (SAFETY LEVER) ARM CYLINDER BUCKET CYLINDER BOOM CYLINDER TRAVEL MOTOR P5 P4 Pi2 Rs MU Pi1 Pn1 Pn2 SWING MOTOR PBa PAb1 P02 P04 PDb2 RCV PEDAL P T TRAVEL PAtr PCtl PDtl (4) (1) (2) (3) PBtr SWING ARM BUCKET BOOM P T P T Dr#, dr# A2 PUMP A1 PUMP PILOT PUMP SAFETY SOLENOID VALVE (4) (1) (2) (3) (4) (1) (2) (3) P03 (MCV) P (T/Joint) Pu (MCV) LEVER UP A H G F E D B J A5 A1 A2 A3 Psv(Pump) P3 P2 P4 P01(MCV) PG(S/Motor) HYDRAULIC TANK PDs PCs PCa a b d e f g h j h2 PS d1 c e2 PS h1 PS T P1 P(2-EPPR valve) PCsp PAk PS PS PS PDa PBk PAb1 PBb1 LEVER DOWN LINE FILTER 330S3HC03 When the lever of the safety solenoid valve is moved upward, oil flows into the remote control valve through solenoid valve and line filter.
When the lever of the safety solenoid valve is moved downward, oil does not flow into the remote control valve, because of the blocked port. 3-8 BC1 NRV2 Cck DR9 Co P05 Do PCo PDo OPTION Ca BC2 NRV1 Cco CoR AkR LCk1 LCk2 DoR OPTION LCo CaR BUCKET BbkR Da DR7 CRa PaL ARM1 DaR BbkR 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 L) PS DR1 P01 PtrPS TS Cs Ds PCs PDs DR5 SWING LCs AbR LCb CRb BOOM1 P03 DR3 Ctl Dtl PCtl PDtl Patt (RIGHT) TRAVEL DR1 BtR AtR (RIGHT) TRAVEL (LEFT) TRAVEL