Update: It has been a frustrating process to this point. I am going to be more specific as to what has been done by my request and what has been done under warranty and what the situation is now.
I purchased the tractor locally with 380 hrs. The tractor looked and operated like new, with one exception. at around 1400 rpm's there was a loud "buzzing" sound coming from under the right side of the tractor. I felt like this was a hydraulic line that needed to be re-supported because when i grabbed the lines at the rear SCV's the sound was muted a good bit. My local dealer was running a winter service special with very reasonable delivery so I thought I would let them do the service and address the hydraulic noise at the same time (I had transferred the warranty). As I mentioned in a previous post, I had also noticed that the engine sound had changed, periodically making a louder knocking/dieseling sound that I attributed to the fuel system needing to be serviced. This was happening with hardly any load on the tractor. So...
Winter service was done (oil, oil filters, all grease fitting etc) In addition a fuel service was done. Flushed fuel system, new filter etc. I addition, I authorized a hydraulic system service which included filters, fluid etc. Finally, I asked that an oil sample be submitted to JD as I was interested in extending the warranty that expires on 1-26-17. This was all done on 12-16-2016. There was also a PTO module that was changed under warranty but it is not reflected on my paperwork.
Got the tractor back, and after about an hour noticed that the FEL was getting louder when raising, lowering, or curling etc. It was also "jumpy" as I mentioned in a previous post. It seemed to me to be a flow issue and I wondered if something had been re-installed incorrectly. There were no leaks.
They picked up the tractor again. The diagnosis for the loader issue was a missing bolt off the inlet pipe at the pump, and that the bolt was not reflected on the JD Parts website, and that the only solution was to replace the pump, which they did. The old pump was black and more oval in shape, and the new pump is painted green and is round.?
The kicker though, is that they diagnosed a further hydraulic issue as a failed internal transmission pump, requiring them to split the tractor to replace, which they did. I had mentioned in passing a "whirring" sound when using the reverser, and that I felt the hydraulic fluid had air in it when viewing it in the sight glass, and the internal pump was the cause apparently.
So, I have the tractor back, it still makes the "dieseling" sound for no reason, and the hydraulic line still makes the noise at 1400-+/- rpms, and no one can find my oil sample so I will miss my window for extending my warranty, but I do have clean oil, new filters, a new hydraulic pump, and a new internal transmission pump. I must say it has been and continues to be frustrating.
Thanks for your interest.