It is exactly what you described. Same thing as a freeze plug. They are for over pressure protection of touch control system. The hydraulic system is a closed system, ie no vent. If you overfill the unit it has no place to expand when the fluid heats up, like it did in your case. The part number is 172592 and is a 2" expansion plug. I got mine from my local Case/IH dealer. It cost more to have it shipped to me than the plug costs. You install it just like a freeze plug. Put it in the hole and then drive it into the hole with a large punch. It is concaved so as you drive it in and it expands.
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