T7074 Rear SCV's

[dcgrosvold]

Hi all -

I just bought a T7074 last fall and I'm enjoying it immensely. However, now that I've used the BB a few times, I have a question for those of you who have more hydro experience than I:

The T7074 comes with three rear SCV's standard. About the only thing I can determine about these from the manual is that the first two (A & B) are spring-loaded to return to neutral, and the third one (C) has a detent - but I can glean nothing else.

Does anyone on the list know if these valves are open center or closed center? Which of them would be good to use if I wanted to add Top-N-Tilt? Since I have the rear valves already, it seems like it wouldn't be too much expense to get the cylinders for the top and right lower links. I just want ot be sure I understand things correctly.

Thanks to anyone who might be able to explain this to a hydraulic noob.