2. SAFETY SOLENOID VALVE 2. SAFETY SOLENOID VALVE (SAFETY KNOB) ARM CYLINDER BUCKET CYLINDER BOOM CYLINDER SWING MOTOR ps1 ps2 T3 T1 T2 T4 TRAVEL MOTOR TRAVEL P T pb6 pa1 pb1 pa6 (2) (1) (4) (3) T1 T2 T3 PUMP A1 PUMP A2 PILOT PUMP (4) P T SAFETY SOLENOID VALVE LEVER UP dr# PH (MCV) F (T/JOINT) j1 PS A1 A2 A5 P3 P4 Pi(D/C VALVE) PP(MCV) Td# P pb9 pb5 T A B C P2 P1 P(2-EPPR) HYDRAULIC TANK pa9 pc1 pa5 pa8 pa11 pb8 pc6 pb3 pb7 pc2 pa7 pa3 (Td#) LEVER DOWN LINE FILTER 480A3HC03 When the knob of the safety solenoid valve is moved downward, oil flows into the remote control valve through line filter, safety solenoid valve and corss assy.
When the knob of the safety solenoid valve moved upward, oil does not flows into the remote control valve, because of blocked by the spool. 3-8 A5 pb5 ARM 1 pa5 B4 A4 pb4 pa4 OPTION A3 B3 pb3 B2 pa3 BOOM 2 A2 TRAVEL(LH TRAVEL STRAIGHT A6 pb6 pa6 ) P3 P2 T ARM (2) (4) B D E (1 ) (3) A (3) (1) (2) F G H J a c pb2 PS pa b d1 d e2 e f 2 PS PS PS 1 f g g1 h PS h1 j j PS CROSS ASS P1 P2 P3