Super Z Kohler 30hp 66" with 100 hours Engine stalls when engaging the control arms forward. At first I thought I had a fuel system issue but I have checked the pump, lines, and filter and all appear to be working fine. What I have noticed is that when turning the key to "on" position I no longer hear the "fan" running at this stage of the ignition. What is it that normally begins operating in the "on" position before cranking? Is it the fan over the heat exchanger for the hydraulics? If so it is no longer coming on. Would this have anything to do with my stalling problems? The engine starts and runs but stalls when moving forward.