2.
SAFETY SOLENOID VALVE (SAFETY LEVER) ARM CYLINDER BUCKET CYLINDER BOOM CYLINDER SWING MOTOR ps1 T3 T4 ps2 T1 T2 pa11 DR1 pc1 pa10 pb9 A5 B5 B9 TRAVEL MOTOR pb5 pb9 A9 (34,2) ARM2 A8 B8 pc1 pa5 pa9 (34,1) P2 BUCKET pa11 pb8 pa8 TURNING JOINT DR2 pc2 A7 BOOM1 B7 pc2 pb3 pb7 pa3 pa7 pc7 pc6 TRAVEL-RH pb6 A6 B6 pa6 STRAIGHT TRAVEL RCV PEDAL P T TRAVEL P2 P3 pa6 pb6 pb1 pa1 (4) (1) (2) (3) A1 A2 SWING ARM BUCKET BOOM P T P T Dr#, dr# FRONT PUMP REAR PUMP PILOT PUMP SAFETY SOLENOID VALVE (4) (1) (2) (3) (4) (1) (2) (3) A5 Pk (T/Joint) A1 A2 A3 PH (MCV) LEVER UP a b d e f g h j c d1 h1 PS PS PS h2 P3 P2 P4 PP(MCV) PG (S/Motor) pb5 pa2 pb2 pa9 pb8 pa8 pa7 pb7 T(dr1) P1 HYDRAULIC TANK RELIEF VALVE LEVER DOWN LINE FILTER 900L3HC03 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 moved downward, oil does not flows into the remote control valve, because of blocked by the spool. So, all hydraulic functions are not disabled. 3-7 p B B A A D p p ARM1 a5 PO B4 A4 1 OPTION 1 R7 c7 A3 B3 b3 B2 pa3 BOOM2 A2 pb2 SWING DR3 pa2 pc6 B1 A1 pp ab 11 TRAVEL-LH pr1 P1 PSPT PP PA PH SH PS