Is it possible to run a single hydraulic line from the front end loader valve on a L4240 (from either ports C or D) to a single-acting hydraulic cylinder on a sickle bar mower? There is no second "return" line. I do NOT have rear hydraulics on my tractor (and don't them need for anything else). Several local farmers have said it will work, but they are using Deere's, not Kubotas. There is a precaution in the owners manual that mentions possible damage to the pump seals if ports C & D are used, but no explanatory details are provided. Thanks for the help.