RYAN - With the fantastic ability to swap parts around on these little tractors, everything from whole rearends & engines, Serial numbers don't mean much. I've mentioned before that Every IH/CC dealership I was in back in the late 1960's & early 1970's had a K241 or K301 complete IH-spec engine sitting on the parts counter. The CC 70 out in the shop DAD bought brand new the spring of 1965, the engine was rebuilt by a small engine shop the first time in '68, was rebuilt the second time by Dad & I in about '71 or '72, and was replaced with a new K181 in about '75 or '76. And I'm not sure at all where the supposed K181 in it now came from.
MARLIN, MATT G. - Hydraulics are pretty neat, I've been around farm tractor hydraulics all my life, and LOTS of construction & industrial equip. also. They're ALL about how much force You need or want and how much room You have for the components. High volume & low pressure means larger cylinders, pumps, hoses, valves, & reseroir. High pressure increases force in direct purportion to the increase. Twice the pressure equals twice the force.
MARLIN gives EXCELLENT ADVICE, once the pressure gets higher than a hundred PSI a leak has DEADLY POTENTIAL. The last thing Your body needs is to have hot high pressure hyd. oil injected INTO Your flesh.