New Holland TC25D manual recommends "fuel injector adjustment" as part of the regular maintenance. What is there to adjust on a fuel injector? And does anyone know where to buy New Holland injectors other than the dealer?
Diesel fuel injectors get tested and rebuilt/replaced when performance indicates action is required or at the time of a major engine overhaul, not before.
Any decent Diesel system repair shop should be able to test and repair your injectors, or supply new.