Have a JD705 basket rake. Same as vermeer r23. This evening my son moved fields and then the baskets wouldn’t turn or just turned very slowly. Swapped to a different tractor with same results. The baskets will freewheel just fine if I spin them by hand. Oil from one will spin the other. I’m thinking it’s the flow control box on the hitch but don’t know how to troubleshoot it. Anyone with experience on this?