My Walker 26EFI is nearing 200 hours (purchased June 1 2k) and I am starting to have some problems getting up hills that I was able to get up before. As I ascend a hill the engine has plenty of power but it seems that the hydros aren't staying with it and I stall. I also get the sound of a belt squeal when this happens. I have checked the idlers and they seem fine and I bought and replaced the ground drive belt at 180 hours. The engine belt was replaced at 120 hours. The mower will go up but I have to really feather the ground speed up real slow. It is no better in reverse. These are steep grades but as I said the mower used to climb them like a lynx. I can't afford to take it in just yet as it is crunch time for leaf season and I have about a week and a half to go. What does it sound like to you?