SYSTEM / Control System Pressure Sensor Boom Raise Boom Lower Arm Roll-Out Bucket Roll-Out Bucket Roll-In Swing Arm Roll-In Pump 2 Delivery Pressure Sensor Boom Bottom Pressure Sensor Pump 1 Delivery Pressure Sensor Travel (Right) Engine Con- trol Dial Travel (Left) Attachment (Optional) Counterweight (Optional) Power Digging Switch Fast Pump 1 Regulator Pressure Sensor Slow Pump 2 Regulator Pressure Sensor Travel Mode Switch Solenoid Valve Unit Pump 1 Control Solenoid Valve Pump 2 Control Solenoid Valve Boom Mode Selector Switch Pilot Pump Travel Motor T1J1-02-02-012 Boom Overload Relief Control Valve Main Relief Valve T2-2-43