2. SAFETY VALVE(SAFETY LEVER) R/G R/G Ps Ps Pm1 Pm2 Pm2 Pm1 P2 P1 T1,T2 T1,T2 P2 P1 D B A C DR P Rs CK1 Pn2 Pn1 BC COMP.
NRV2 NRV1 S/Motor DB Pk D5 C5 A5 B5 Pc5 Pd5 OPTION-B BUCKET CK2 Pb5 Pa5 (RG) SGo Dr SRG ARG SH C4 D4 B4 PG Pd4 0 DR3 Pc4 1 REGENERATIION CUT BREAKER Pa4 Pb4 Au Dr(R7) Pc4 0 ARM1 OPTION-A Pc4 2 Pb3 GB GA DR2 Pc3 Pa2 1 BOOM2 ARM2 Pd4 1 B(CW) Mu A(CCW) C2 D2 V3 Pb2 1 B2 A2 Pd2 Pc2 SWING BOOM1 P02 DR1 Pa2 Pb2 0 0 Pc1 D1 C1 Patt A1 Pb1 B1 P01 DR0 Pd1 TRAVEL (LEFT) TRAVEL (RIGHT) Pa1 Ptr STRAIGHT TRAVEL MRV T1 P2 P1 Pu SWING ARM BUCKET BOOM TRAVEL (2) (4) (3) (1) SH (3) (1) (2) (4) A1 A2 Psv a4 A B D E G F H J Pd2 Pc2 Pc4 0 Pa2 0 Pb2 0 T P Pa5 Pb5 Pd1 Pc1 Pb1 Pa1 (1) (2) (3) (4) Dr#,dr#,R# a2 a1 Pd4 0 Pm1 (Pump) Pm2 (Pump) A1 Pk (T/Joint) A1 A2 ACC Pi1 (Fl,MCV) Pi2 (Fr,MCV) Pm1 Pm2 A2 P2 P3 P4 PG(S/Motor) Po1(MCV) M Dr a3 T(dr2) T T P1 B1 B3 A3 D21073HS03 When the lever of the safety solenoid valve is moved downward, oil flows into the remote control valve through solenoid valve and line filter.
When the lever of the safety solenoid valve is moved upward, oil does not flow into the remote control valve, because of the blocked port. 3-7