I just purchased a used (maybe a 2004) Grasshopper 218, it has a brand new Kohler 18 horse motor and the rest of the machine has 830 hours on it. I've only used it about 4 times since I bought it and today the right drive doesn't seem to want to work in forward. It worked fine for an hour or so then it started making a racheting noise from the right wheel motor it seemed. Reverse worked fine but forward on the right wheel motor only isn't working right all the time. It is intermittent also. It screws up and then is fine for half an hour or so and then it starts the noise again. When it makes the noise it kind of locks the right wheel. So, when making a racheting noise the wheel is stuttering forward. Any ideas? Thanks in advance for any ideas. The "OldPhart"