6.
SWING PARKING BRAKE RELEASE ARM CYLINDER BUCKET CYLINDER BOOM CYLINDER SWING MOTOR SH SH DB PG DB PG M M PB PA A(CW) B(CCW) PB PA A(CW) B(CCW) TRAVEL MOTOR pa5 pc1 pa9 (34,2) P2 pa11 pb8 pa8 (34,1) A7 B7 pb3 pb7 pa7 pc7 TURNING JOINT pc6 A6 B6 RCV PEDAL P T TRAVEL pa6 pb6 pb1 pa1 (4) (1) (2) (3) A1 A2 SWING ARM BUCKET BOOM P T P T Dr#, dr# FRONT PUMP REAR PUMP PILOT PUMP (4) (1) (2) (3) (4) (1) (2) (3) Pk (T/Joint) PH (MCV) a b d e f g h j c d1 h1 PS PS PS h2 A5 A1 A2 A3 P3 P2 P4 PG (S/Motor) pb5 pa2 pb2 pa9 pb8 pa8 pa7 pb7 T(dr1) P1 PP(MCV) HYDRAULIC TANK RELIEF VALVE LINE FILTER 900L3HC07 When one of the RCV lever (except travel lever) is tilted, the pilot oil flows into SH port through main control valve.
This pressure moves spool so, discharged oil from pilot valve flows to swing motor PG port. This pressure is applied to swing motor disc, thus the brake is released. When all of the RCV lever are set in the neutral position, oil in the swing motor disc cylinder is drained, thus the brake is applied. 3-11 ps1 T3 T1 pa11 T2 T4 ps2 pa10 D p B5 A5 pb pb5 p B B A A D p p R1 c1 9 ARM1 a5 PO B4 A4 1 OPTION 1 R7 c7 A3 B3 b3 B9 A9 pb9 ARM2 B8 A8 BUCKET DR2 pc2 p B2 pa3 BOOM2 A2 pb2 SWING DR3 pa2 pc6 B1 A1 pp ab 11 TRAVEL-LH pr1 P1 PSPT PP PA PH SH PS