7. COMBINED BOOM AND TRAVEL 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 B4 (RG) SGo Dr PG Pd4 DR3 Pc4 1 REGENERATIION CUT BREAKER Pa4 Pb4 Au Dr(R7) 0 Pc4 0 Pc3 ARM1 OPTION-A Pc4 2 Pb3 GB GA DR2 Pa2 1 BOOM2 ARM2 Pd4 B2 1 B(CW) Mu A(CCW) C2 D2 V3 Pb2 1 A2 DR1 Pa2 Pb2 Pd2 Pc2 SWING BOOM1 P02 Patt 0 0 Pc1 D1 Pd1 C1 TRAVEL (LEFT) 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) D21073HS23 When the boom and travel functions are operated, simultaneously the boom spools and travel spools in the main control valve are moved to the functional position by the pilot oil pressure from the remote control valve and the straight travel spool is pushed to the left by the oil pressure from pilot pump.
The oil from the front pump flows into the boom cylinders through the boom 2 spool and boom 1 spool via the parallel and confluence oil passage in case boom up operation. The oil from the rear pump flows into the travel motors through the RH travel spool of the right control valve and the LH travel spool of the left control valve via the straight travel spool. 3-28