GROUP 5 COMBINED OPERATION 1. OUTLINE 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 NRV1 Pk BC COMP.
NRV2 B5 S/Motor DB Pc5 Pd5 C5 D5 A5 Pb5 SRG ARG C4 OPTION-B BUCKET CK2 Pa5 (RG) SGo Dr SH PG DR3 Pc4 D4 1 REGENERATIION CUT Pa4 Pb4 B4 Au Dr(R7) Pd4 0 Pc4 0 ARM1 OPTION-A BREAKER Pc4 2 GB GA DR2 Pc3 Pa2 1 BOOM2 ARM2 Pd4 Pb3 1 B(CW) Mu A(CCW) C2 D2 V3 Pb2 1 B2 A2 DR1 Pd2 Pc2 SWING BOOM1 P02 Pa2 Pb2 0 0 Pc1 D1 Pd1 C1 TRAVEL (LEFT) Patt A1 Pb1 B1 Pa1 P01 DR0 TRAVEL (RIGHT) Ptr STRAIGHT TRAVEL T1 P2 P1 Pu MRV 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 Pm1 (Pump) Pm2 (Pump) Pd4 0 Pk (T/Joint) Pm1 Pm2 A1 A2 A1 A2 ACC P4 PG(S/Motor) Pi1 (Fl,MCV) Pi2 (Fr,MCV) M T T P2 P3 P1 Po1(MCV) Dr B1 B3 A3 a3 T(dr2) D21073HS17 The oil from the front and rear pump flows through the neutral oil passage, bypass oil passage and confluence oil passage in the main control valve.
Then the oil goes to each actuator and operates them. Check valves and orifices are located on these oil passage in the main control valve. These control the oil from the main pumps so as to correspond to the operation of each actuator and smooth the combined operation. STRAIGHT TRAVEL SPOOL This straight travel spool for straight travel is provided in the main control valve. If any actuator is operated when traveling, the straight travel spool is pushed to the left by the pilot oil pressure. Consequently, the left and right travel oil supply passage are connected, and equivalent amount of oil flows into the left and right travel motors. This keeps the straight travel. 3-22