I've had a 5065E for almost a year now. The starter went out the first week or so. When you think of how many hundreds of starters a plant would put out in a day, I feel I just happened to get a bad one. Warranty covered the repair & service trip.
The rear hitch has been the problem. It went out completely, I'm told because of the Factory original design of putting a gasket AND O-rings on the tubes from the pump to the rear control valve. Gasket cuts the O-rings, rear hitch starts sucking air, and rear hitch quits working. Make a short story long, I *****ed enough about this repair that warranty paid the repair and the dealer ate the cost of transportation to and from my farm. This was at about 45 hours.
PS - when the above happens, the rear control valve under the seat gets so hot it melts the plastic fuel tank. Dealer-warranty also paid for a tank.
HOWEVER, the rear hitch still seems to be a weak link. Unit has 58 hours or so on the unit, so it's not under-use or over-use. I say the rear hitch is still weak, as, upon startup -- the front (mid) hydraulics work immediately at start-up. Sometimes, the rear hitch will not raise my MX-8 shredder until several minutes after startup, and by then I've drug it out of the shop, and across the farm leaving two drag marks on the ground. Then all of a sudden, it raises.
A neighbor has a late model 45-50 hp unit that, if he kills the tractor with the implement raised, upon start-up, the rear hitch will not work until he bangs the implement across his driveway or a ditch bank to make an internal valve release. Then the rear hitch works fine.
I expected MORE from John Deere.