I have found some threads about this topic but none that really answer my questions. I Have a 09 Grandstand with about 400 hours on it. It seems that when the engine and hydraulic oil heat up the wheels tends to slow down and not pull as hard up hills and things like that. I have seen some people say something about various updates to this model year of grandstand but no solid answers to this problem. If anyone has experience with this type of situation or knows anything about it please give me the list of updates I can make to make the machine function properly.