COMPONENT OPERTATION / Control Valve Bypass Shut-Out Valve Arm Flow Rate Control Valve Air Bleed Circuit Boom Anti-Drift Valve Auxiliary (Attachment) Pilot Pressure 6 5 Arm 1 Spool Pilot Pressure from Arm Flow Rate Control Valve Control Spool in Signal Control Valve 3 4 4 3 Pressure Oil from Pilot Pump Arm Anti-Drift Valve Pressure Oil from Pilot Pump 2 1 2 Pilot Pressure from Solenoid Valve Unit (SF) 1 Pilot Pressure from Solenoid Valve Unit (SC) 8 7 Boom 1 Spool 14 13 Boom Flow Rate Control Valve 11 12 9 10 Boom Overload Relief Control Valve Main Relief Valve Pilot Pressure from Solenoid Valve Unit (SG) Pilot Pressure from Flow Combiner Valve Control Spool in Signal Control Valve Flow Combiner Valve Bypass Shut-Out Valve T1J1-03-03-001 1 - Boom Raise 5 - Left Swing 9 - Travel (Left Forward) 13 - Auxiliary (Open) 2 - Boom Lower 6 - Right Swing 10 - Travel (Left Reverse) 14 - Auxiliary (Close) 3 - Arm Roll-Out 7 - Bucket Roll-In 11 - Travel (Right Forward) 4 - Arm Roll-In 8 - Bucket Roll-Out 12 - Travel (Right Reverse) NOTE:
Yellow line : Pilot Control Circuit Orange line : External Pilot Pressure Circuit T3-3-19