2.
SAFETY VALVE (SAFETY LEVER) ARM CYLINDER BUCKET CYLINDER BOOM CYLINDER TRAVEL MOTOR (Pump) Pi2 (Pump) Pi1 SWING MOTOR Ab Bb XBb1 RCV PEDAL P T TRAVEL PH P2 P1 R1 Po P3 PG XAtL XBtr XAtr (4) (1) (2) (3) XBtL A1 A2 SWING ARM BUCKET BOOM P T P T Dr#, dr# FRONT PUMP REAR PUMP PILOT PUMP (4) (1) (2) (3) (4) (1) (2) (3) Pns (MCV) Pis (MCV) Pk (T/Joint) Pz (MCV) SAFETY SOLENOID VALVE a b d e f g h j A5 A1 A2 A3 A4 P4 PG (S/Motor) LEVER UP HYDRAULIC TANK Psp XBk XAs XBs d1 e1 c h2 PS SH PS e2 h1 PS PS T P3 P2 P1 PG(MCV) Psv(PUMP) Pss PS XAa1 XAk XAa2 XBp1 PbL XBb1 (dr1) LEVER DOWN LINE FILTER XBa2 XBa1 PaL XAb1 XAb2 PnA2 PCk 220S3HC03 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 3-8 R2 PaL Aa XAa1 XAa2 ARM 2 XBa2 Pp Pss XBa1 Dr7 PnA2 PCV2 YPASS CUT Bo Ao XAo OPTION XBo XAb2 Pss BOOM 2 Psp Bs Pns SWING PRIORITY Swing reducing spool (PTa) Ak XBp1 Bk XAk XAb2 As XAs SWING XBs Dr6 Btr Dr2 Atr TRAVEL(RH) XAtr XBtr