8. COMBINED ARM 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 BC COMP.
NRV2 A5 B5 Pc5 Pd5 D5 C5 OPTION-B BUCKET Pb5 Pa5 SRG ARG SH C4 CK2 (RG) SGo Dr PG DR3 Pc4 D4 1 REGENERATIION CUT Pa4 Pb4 B4 Au Dr(R7) Pd4 0 Pc4 0 ARM1 OPTION-A BREAKER 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 Pa2 Pb2 0 0 Pc1 D1 Pd1 C1 Patt 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 D21073HS24 When the arm and travel functions are operated, simultaneously the arm 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 arm cylinders through the arm 1 spool and arm 2 spool via the parallel and confluence oil passage. 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. The arm is operated and the machine travels straight. 3-29