You have a dealer problem. Blaming this on Deere tractors is not right. Your dealer is not willing to get a mechanic that can find and fix the problem. But maybe this time will be a charm and the relief valves have corrected it.
Well I don't know what else they really could do, They ordered the tractor, it was delivered to me with 1.6 hours on it and the issue would only show up at 2 hours of straight runtime. When I had the issue, they came and picked up the tractor and did what test Deere told them to do and everything they told me, Deere confirmed. When I told them I was not happy with the answers or lack of answers, they then came and got the tractor again and went to working on the issue again..
Unless I am missing something...