For all of you that have an X300-X500 riding lawn mowers, I don't have to tell you how reliable they are. I just keep clean oil in the engine, sharpen the blades frequently, and grease all of the fittings. BUT, some of you may have noticed that the steering gear wears out on the side associated with left turns. This makes sense, because the grass discharge is on the right side and most people mow counter-clockwise (like NASCAR drivers) so that the grass always discharges onto the previously cut grass. Alas, this behavior causes the steering gear to wear out on one side. It would be a good thing to make this gear out of a thicker piece of metal or, perhaps, make the side associated with left turns a little thicker. That would be a small design change to enhance the reliability. These gears cost about $60.