Ive just bought a 60 HD and am having trouble with it tracking straight.I brought it back to dealer and they refilled hydros and replaced the filters but I'm having the same problems.Also I suspected its not going as fast as I was told it would go,they advertise 8mph,but its not going much faster than my craftsman tractor.My GPS reads between 6.5-7mph.At those slow speeds I don't know how accurate it is.Has anyone else had these issues?