You may be correct on the exact method of control. It's a long time since I looked at Deere pump theory specifically... I tend to think more in terms of axial piston pumps rather than radial pumps... and swash plate control in a standard CC axial setup... the pump is normally in stroke whereas in a CCLS setup the pump is normally de-stroked. Regardless, I still don't see why the radial pump can't operate in an open center system. That pump is still normally 'in stroke' unless it reaches high stand-by. All you're doing is limiting it's ability to reach high stand-by because there's nothing for it to build pressure against so it never de-strokes. I see no reason for it to cavitate as long as it's got sufficient charge flow. I don't see it working without a pressurised charge flow tho... unlike an axial piston pump which in most cases can operate without charge pressure from a static source.
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