I am with winston1 on this. That V2 loader is a 100% no doubt Vietnam rebuild tractor. There are all kinds of horror stories on their rebuilds! With one of the most consistent complains being a worn out engine having minimum repairs done, new paint and hour meter set to zero or new installed.
That being said with no doubts in my mind about it, fix it right while you have it torn down. Even being a Vietnam tractor, repair the engine, rebuild the injection pump, drain the oil, fuel and hydraulic fluid, clean or replace the screen, put new fluids in it and it will probably last if cared for through your grandchildren痴 lifetime. They are just that solid if taken care of!
My understanding in reading on the tractors in Japan is not a every year trade, but a trade in as the tractor is paid for based on the fee structure.