Thanks mrfixit. I appreciate the pointers. I have zero experience with hydraulics, so can someone give me a generic overview of the proper way to "flush" the system? There is water in it, so I assume I'll probably need to drain it and fill it at least twice - I think. And when it comes to bleeding the system, assuming that is needed, I'm at a loss. This old machine has a lot of character, and it seems to be in pretty good shape, so I really don't want to break it.