4. COMBINED SWING AND BUCKET OPERATION R/G R/G Ps Ps Pm1 T1,T2 Pm2 Pm2 T1,T2 Pm1 P2 P1 P2 P1 Rs CK1 Pn2 Pn1 D B A C DR P NRV1 S/Motor DB Pk C5 BC COMP.
NRV2 A5 B5 Pc5 Pd5 D5 OPTION-B BUCKET Pb5 Pa5 SRG ARG SH C4 D4 CK2 (RG) SGo Dr PG Pd4 DR3 Pc4 1 REGENERATIION CUT BREAKER Pa4 Pb4 B4 Au Dr(R7) 0 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 DR1 Pd2 Pc2 SWING BOOM1 P02 Patt Pa2 Pb2 0 0 Pc1 D1 Pd1 C1 B1 A1 Pb1 Pa1 P01 DR0 TRAVEL (LEFT) TRAVEL (RIGHT) Ptr STRAIGHT TRAVEL T1 P2 P1 Pu MRV SWING ARM BUCKET BOOM TRAVEL (2) (4) (3) (1) (3) (1) (2) (4) Psv A B D E G F H J SH Pd1 Pc1 Pb1 Pa1 (1) (2) (3) (4) a2 a1 A1 A2 a4 Pd2 Pc2 Pc4 0 Pa2 0 Pb2 0 T P Pd4 0 Pa5 Pb5 Dr#,dr#,R# 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 D21073HS20 When the swing and bucket functions are operated, simultaneously the swing spool and bucket spool in the main control valve are moved to the functional position by the pilot oil pressure from the remote control valve.
The oil from the front pump flows into the swing motor through the swing spool in the left control valve. The oil from the rear pump flows into the bucket cylinder through the bucket spool in the right control valve. 3-25