There are very serious build quality issues with this tractor. I ultimately ended up trading in my 2015 with only 3 months left on the warranty, because there were so many issues with it.
I now have a 2017 T4.75 and I'm praying they worked out these issues, but unfortunately, I know of other owners who are having issues with their 2016 and 2017 T4 tractors. Leaks galore (< 200 hours), clutch engagement failures, shuttle shift failures, shift cable alignment issues, hydraulic washers not made to spec, overheating, and low hydraulic pressure to name only a few I've encountered.
If you don't believe me, look how many of them are for sale on TractorData. There are more T4.75s for sale than any other New Holland model, and some are really cheap!!! Wonder why? I don't.