Lost the forward drive in my jcb today. I was pushing snow hot some soft ground. Made the machine stall when I started it back up it wouldn't drive forward. I have reverse and can turn left and right fine. The joystick does nothing when I press forward. It has hydraulic pilot controls. I checked fuses and relays all are good. Anyone know where I can start looking? I just bought the machine used a couple weeks ago and haven't even made any money with it yet....