Blowing hydraulic hose solution

[john p]

You've confused me and while you're not David Bailey and  that spool block's not the shrimp  it looks like a single slice spool with a  adjustable pressure relief valve to the right of the lever as htb said.  Why would it need an inlet and outlet and the two service ports if it is only a changeover switch?
 
Yes there will be springs if you take off the end cap but they tend to be only compressed if the lever is not in neutral.
 
On the three spool picture there is a metal lever to the left, this looks more like a diverter.

Lever on the left switches flow from basket to ground control