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Volvo EC 25 question

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Hi first post here, thanks in advance for any help.
I bought a EC25 a couple years ago with 1700 hours, now 2100, no major issues at all.
I'm in the process of installing a new thumb and cylinder, and was told that the plumbing out to the stick was set up for a thumb, it had used quick disconnects on the lines.
The valve element that the foot rocker operates for the accessory is controlled by a cable which functions fine.
The feed line ( push piston out ) comes directly from the valve, but the larger line ( return ) first connects to a block by the spool valve and from that block to the other end of the accessory valve.
When I operate the foot rocker, no matter which way, it pushes out he piston, reverse the lines, same thing.
I didn't mess around with it much, because I did not want to push the piston to the "out stop".
It seems to me that the hydraulics from the factory ( every pic on the internet seems to have those two lines on the left side of the boom/stick) is set up for a saw or hammer needing constant flow. I do not find any valve, etc to change the set up. There are no unused switchs in the cab.
Any thoughts?
Thanks
Steve

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