I have a JD 4510 with a 460 loader attached. Tractor has 330 hours and the loader has never been removed from the tractor and I bought new. Problem is the loader controls don't work properly. This problem just started a few days ago and is staying consistent. No worse or no better. Loader bucket will not roll back at times. Sometimes it will just fall down when trying to roll back. The loader arms raise real slow at times and not at all at times. Then they will work fine for a few minutes and go back to not working..... Its covered under warranty in which the dealer will handle, I'm just curious.....anyone know about hydraulics that can explain whats goin on with this thing?