COMPONENT OPERTATION / Control Valve Flow Combining Circuit Boom 2 Spool Swing Motor 5-Spool Section 4-Spool Section Boom Cylinder Arm Cylinder Overload Relief Valve Boom Overload Relief Control Valve Bucket Cylinder Auxiliary Travel Motor (Right) Travel Motor (Left) Overload Relief Valve 4-Spool Section Parallel Circuit 5-Spool Section Parallel Circuit Overload Relief Valve Main Relief Valve Pump 1 Pump 2 T450-03-03-029 T3-3-17