Why is there white smoke coming out of your tractor?

Could be an injector spraying at below the pressure that it should. Or a head gasket. Check your radiator for milky fluid, if not you can determine the bad injector by loosening the nut at the injector line/injector until the sound of the engine changes. The one that does the least change to sound/rpms is the bad one. You can have it tested at your local dealership.