Hello, I'm new to the forum (and garden tractors). I am having a problem with my F510 that I hoping someone can help point me in the right direction on the solution. The F510 is a 3 wheel mower with rear wheel steer and has a 14hp Kawasaki engine and hydrostatic drive. I recently purchased this tractor used with the hour meter showing ~150 hours on it. It seemed to be in good shape when I purchased it but after the 3rd time I used it to my my yard, it began to bog down and seemed to lose power. I noted a small amount of smoke, that didn't smell like rubber (belt) burning, but couldn't identify the source. Once I shut the mower down and restarted it, it would not move in forward or reverse. As soon as I took my foot off the brake and engage the drive the engine would stall. When I went to disengage the hydro so I could roll it into my garage for a closer look I found I had to tap the brake actuator lightly with a hammer to get it to disengage so it would roll freely. When the drive is not engaged, the engine starts and runs just fine. I am not very familiar with the mower or the detail working of a hydro. Is there something simple I can do/check like flush the fluid or am I screwed? Thanks in advance for any help.