[Exposed]

I know this is a little off subject but relates to the hydraulic jacks. I know on our farm tractor, the hydraulic lift extends and retracts just like our jacks/cylinder slides. The cylinder has equal volume on each side of the cylinder internal. So the amount of fluid required to extend/retract is the same. Maybe all hydraulic cylinders are not created equal. Since they say that the jacks/cylinders need to be retracted to set the level of the reservoir. Why would it matter if the jacks/cylinders were extended/retracted in the reservoir? Looks like either direction would require the same amount of fluid. The only thing I can think is the extend side of the cylinder has a larger volume than the retract side. The landing jacks require less resistance to raise than lower. The slide cylinder would require the same I would think since in/out would be probably the same resistance. Maybe someone has some experience in this and can explain...