My dad ran a 190 picker on a Series III. You can't take the arms off because the rear mainframe mounts to them. Dad did not have a transport valve on his Series III, he had more of a home-made plumbing arrangement and he just disconnected the internal lift cylinder and only the remote ram was hooked up when he had the picker mounted.
I looked in my 190 picker operators manual last night briefly and did not see a good explanation of what to do here in the manual. Mike