I dunno about becoming some parts king. I think most guys would have scrapped the machine or parted it out before they dropped coin for a new valve body on this old of a machine.
I paid $5000 for the lift. So far, I've replaced 3 of the controls for $480, a final drive for $900, this valve body for $1100, a thermostat for $10, and some PM work. Counting my labor, I've doubled the purchase price on this machine in repairs. Now, I've got a quote from a tire guy for $2000ish for 4 new tires (8.75x16.5, foam filled). The tires are in very rough shape, but keep going around for now. I'd like a wider tire (9.5x16.5 was a factory option), but they aren't any cheaper.