Ah... But if we discount the big boys... What about all tractors like the John Deere 790 or 4100? Plenty of these compact tractors being made today that'll remain reasonable in size. Now fixing them...many parts are engineered with less "extra" in them today. Might need more custom machine work to fix them, or outright replace something with a different design. IMHO, one of the biggest potential problems is the electronic controls for the engine. Now, it's probable you could build a module to "plug in" somehow to replace it. But, will the companies release the copyrighted software to actually run the engine properly? Will any combination Tractor Buffs/Computer Geeks be able to reverse engineer and make their own coding? Think of the ultimate in obsolence -- mechanically sound engines, but a chip fries that controls it, there's no one left with equipment that can make an identical chip, and the company refuses to release the software for a "universal" replacement...or worse, someone deleted the files a decade back and they simply don't have the source files anymore!
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