I have a g5200h, 15hp diesel lawn tractor. She's run like a champ for a few years, but suddenly she decided to not want to move any longer. The engine is fine and the drive to the HST is spinning properly. But when you put the pedal into forward or reverse she will barely crawl and with little to no power. All fluids and filters have been changed at regualr intervals and recently. Just took apart the entire HST (took a day), and there's no swath, no scaring, or any damage of any type internally, I was amazed at what good condition she was in. I've heard of these old smaller HST's going bad from heat abuse as they age, but no specifics. Anyone run into a similar problem and know the fix? I'm guessing its the hydraulic pump, but I'm not sure what the pressure should be anyways and I don't have a pressure gauge to test it.