SYSTEM / Hydraulic System Attachment Pilot Valve Arm Flow Rate Con- trol Valve Spool Signal Control Valve Pilot Shut-Off Solenoid Valve Flow Combiner Valve Spool Bypass Shut-Out Valve Arm Flow Rate Control Valve (Switch Valve) Boom Anti-Drift Valve Arm Anti-Drift Valve Boom Overload Relief Control Valve Solenoid Valve Unit SG SF SC Boom Flow Rate Control Valve (Switch Valve) Flow Combiner Valve Main Relief Valve T1J1-02-04-004 Pilot Pump T2-4-9