I got a new tractor and had dealer move my 3rd function diverter (electric from surplus center). When I went to use it, it would open but not close. I switched hoses and it would then close but not open. So I guess 1 hose is not being pressurized. I checked connections( they had wired backwards) and it clicks on either side. Anything else I should check or is valve bad(less than 6 mo old)? Do they make a manual valve? Thanks