Looked at the Oliver post, am I missing something here??? I can only make out one line going to the bottom of the lift cylinders, is this correct?
Appears to me that it is a gravity down loader, hydraulic system on the 555 is an open center system, 1 line coming into the spool valve from pump and another returning to pump. The top port, closest to the control handle,should be hooked the both cylinders. which can either be tee'd on top the spool valve or some where else. the other port farther away from handle needs to be plugged off.
The way it is plumbed now, each cylinder is fighting one another.
This is not rocket science!!!