SYSTEM / Controller Pressure Sensor Boom Raise Boom Lower Arm Roll-Out Arm Roll-In Bucket Roll-Out Bucket Roll-In Swing Boom Bottom Pressure Sensor Pump 1 Delivery Pressure Sensor Pump 2 Delivery Pressure Sensor Travel (Right) Travel (Left) Attachment (Optional) Counterweight (Optional) Engine Control Dial Power Digging Switch Fast Pump 1 Regulator Pressure Sensor Pump 2 Regulator Pressure Sensor Slow Travel Mode Switch Solenoid Valve Unit Boom Mode Selector Switch Pump 1 Control Solenoid Valve Pump 2 Control Solenoid Valve Travel Motor Boom Overload Relief Control Valve Main Relief Valve T1J1-02-02-012 T2-1-9