I have a Great Dane surfer and I am having a slight problem with the left hydro, looking at it from the rear. The problem is, when it is cold at first start up left hydo will move forward direction no problem, but in reverse the pump whines like it's loading up. After about ten minutes of running with the hydraulic fluid warm it goes away and no more problems. Right hydro has no problems at all when temps are low. In the summer 85-100 really don't have any problems at all. Local shop says this is normal in cool outside temp. I am trying to sell this mower and people are having some concern about the hydro problem. So any suggestion from the Pro's???????? I have it for sale, if any of you are interested!