I ran a 8560 for 10 years, 8570 this fall and never had a hydraulic problem. Only electrical problem was a broken wire for one of the sensor pads on the grainloss monitor. Good luck
We have 8570, it has leaks on hydraulic pump and the 2 vale assemblies (I have not taken the time to check it out yet, after the first of the year) Had broken wires on shaft monitor and oil sender intermition pegs out that at 3600 hours. Has been good electricaly and whith hydraulic. swtvid
Have run 8570 for three years, no hydralic or electrical problems in 900+hrs and total 1600 hrs on machine. One poor connection from switches to work lights on front of machine where the connector goes through the dash panel in right rear of cab. Other wise an excellent machine