I am fairly new to the ZTR mower game and just bought a used 60" Lazer Z with a Kholer Command 25. It ran fine for the past month but it now seems to be acting up a bit. The weather here in PA the last 3 days has been around 95 degrees. The first issue I had was the mower ran fine for 20 minutes then shut off, kind of like it was out of fuel (there was plenty in the tank). I was able to start it back up but evey time I went to release the parking brake it would stall out, it would run with the brake on though. I looked it over and turns out there was grass packed up in the engine belt and all around the hydro pumps. Today I mowed again, it ran great this time for 1.5 hours. I stopped for a minute or two to grab a drink and let the mower idle, when I went to start mowing again the same problem as before. Please Help!!!