GROUP 1 HYDRAULIC CIRCUIT T(dr2) 28 25 Pd2 Pc2 Pc4 0 Pa2 0 Pb2 0 T P A B D E G F H J (2) (4) (3) (1) SWING ARM BUCKET BOOM 7 5 6 (RG) Dr SRG ARG SH R/G R/G T Pm1 (Pump) Pm2 (Pump) Pd4 0 27 SH SGo GB PG A2 A1 Au Dr(R7) Pm2 Ps Pm2 Ps 22 Pa5 Pb5 (3) (1) (2) (4) Pm1 Pm1 T Pk (T/Joint) B(CW) Mu A(CCW) GA P1 P2 T1,T2 T1,T2 P2 P1 A1 A2 ACC 23 3 12 DR P 4 P1 P2 P3 P4 C A D B 21 Po1(MCV) PG(S/Motor) Pd1 Pc1 Pb1 Pa1 (1) (2) Pk S/Motor DB (3) (4) TRAVEL 26 15 17 Dr#,dr#,R# 19 14 18 M 13 P01 DR0 Pc4 Pd4 0 20 16 24 Pd1 Pc1 D1 Pd2 Pc2 DR2 0 DR3 Pd5 Pc5 Pi1 (Fl,MCV) Pi2 (Fr,MCV) STRAIGHT TRAVEL Ptr TRAVEL (LEFT) C1 SWING D2 C2 V3 BOOM UP Pa2 1 Pc3 Pc4 1 D4 C4 OPTION-B D5 C5 3-1 Pm1 ARM1 Dr a2 a1 1 T1 P2 P1 BC COMP.
Rs CK1 A1 A2 B1 B3 a4 Psv Pu NRV2 Pn2 Pn1 MRV BOOM REGENERATIION CUT NRV1 A3 a3 Pm2 TRAVEL (RIGHT) ARM2 OPTION-A BUCKET Pa1 A1 Pb1 B1 Patt P02 DR1 Pb2 1 A2 B2 1 Pd4 Pb3 Pc4 2 BREAKER Pa4 Pb4 B4 CK2 Pb5 A5 B5 2 24 Pa5 Pa2 Pb2 0 D21073HS01 0 SECTION 3 HYDRAULIC SYSTEM 10 11 8 9 1-CARTR' V/V 28 27 Shockless V/V 26 LAST G.FILTER 25 TERMINAL PRESSURE S/W 24 ACCUMULATOR 23 22 2-CARTR'V/V LINE FILTER 21 20 SPIN FILTER 19 STRAINER ASSY ELEMENT-RETURN BYPASS VALVE 18 17 AIR BREATHER 16 OIL COOLER 15 HYD.TANK ASSY 14 CHECK V/V 13 CHECK V/V 12 TURNING JOINT 10 11 ARM CYL BUCKET CYL BOOM CYL(R/H) 8 9 BOOM CYL(L/H) 7 RCV PEDAL 6 RCV LEVER(R/H) 5 RCV LEVER(L/H) 4 TRACK MOTOR 2 3 M.C.V SWING MOTOR PUMP 1 1 Main pump 2 Main control valve 3 Swing motor 4 Travel motor 5 RCV lever(LH) 6 RCV lever(RH) 7 RCV pedal 8 Boom cylinder(LH) 9 Boom cylinder(RH) 10 Arm cylinder 11 Bucket cylinder 12 Turning joint 13 Check valve 14 Check valve 15 Hydraulic tank 16 Oil cooler 17 Air breather 18 Bypass valve 19 Strainer 20 Spin filter 21 Line filter 22 Solenoid valve 23 Accumulator 24 Pressure switch 25 Shuttle valve 26 Last guard filter 27 Shockless valve 28 Solenoid valve SECTION 3 HYDRAULIC SYSTEM GROUP 1 HYDRAULIC CIRCUIT