The brass bushings were coming out of the piston bores. Supposed to be as many as 10 or so failures. I was told Danfoss was the hydro manufacturer. Could be Danfoss and Sauer-Sunstrand are the same company these daysIJ Also some units computers are not yet programmed to be able to identify the header attached to them. Without this function the head type_size must be manually selected to use it. If it doesn't know it has a grain head attached it won't send power to the electric valves for the reel lift or fore_aft for example. All of this is supposed to be taken care of by the time they acually start the assembly line up.