Check the JD website for the loader install manual - maybe its on-line. The install manual also has the recommended ballast, etc.
I don't have a scanner or camera handy, but looking at the diagram in the 4100 operator's manual, the SCV connectors:
#1 #2
#3 #4
Viewed from the front #1 is the top, out-board connector.
1: Bucket Curl - this connector should be routed to the bucket cylinders, the end closest to the rod such that pressure on this line makes the cylinder retract and the bucket curl.
2: Bucket Dump - this connector should be routed to the bucket cylinders, the end furthest from the rod such that pressure in this line makes the cylinder extend, dumping the bucket.
3: Down - this connector should be routed to the boom cylinders, connected to the end nearest the rod such that pressure on this line retracts the cylinders, lowering the loader.
4. Up - this this connector should be routed to the boom cylinders, connected to the end furthest from the rod such that pressure on this line extends the cylinders, raising the loader.
The flow restriction orifice should be installed in-line with the Boom Up connector so as to slow the lowering when heavily loaded.
You will have to trace the lines on the actual loader. I don't have the loaader manual handy in front of me, and I would trust the actual physical machine more than the doc since I recall there was some confusion or difference in the diagram vs. the actual loader plumbing.