SYSTEM / Hydraulic System Roll-In Signal Control Valve Pilot Pump Arm Flow Control Valve Control Spool 4 1 Arm Regenerative Valve (Switch Valve) Arm Flow Rate Control Valve (Poppet Valve) 5-Spool Section Parallel Circuit Arm 2 Boom Cylinder 4 4 Arm Cylinder 1 1 Arm 1 Boom 1 Boom 2 Arm Flow Rate Control Valve (Switch Valve) 4-Spool Section Parallel Circuit Pump 2 Pump 1 T1J1-02-04-009 T2-4-23 Arm Roll-Out Boom Lower Raise