[bestgenman]

An experience with no power steering caused me to become more familiar with the system.   The hydraulic feed to the steering box (on 567) is a #8 AII braided hose, it must have dropped down at some point and rubbed on the cooling system valve block feeding the aqua-hot and dash heat.  The supply hose to the steering box is fed from the fan control block.  A small hole rubbed into the line caused the fluid to leave the system while trying to back up to a trailer.  A considerable amount of steering input involved when in tight quarters.  When the wheels are not rotating, the 365 ground patch is about one square foot and 9,000 lbs  ground pressure, making it nearly humanly impossible to turn without assist even rolling.  
Those of you having the same supply line configuration might want to inspect for rubbing.  I shudder to think what would have happened at high speeds.