We have had good luck with new Holland round balers....knock on wood. Over 18,000 bales on a 640 and almost 16,000 on a 7060. Have had minimal repairs on both. Both mainly have done dry hay, but both have baled stalks and wrapped bales. I don't know if the fact that we make 4x4.5 bales instead of 4x5's makes a difference. We may trade off the 640 this winter and are really considering a claas. Great local dealer and have been real pleased with our class big square.
I'm at 11,000 + bales on a 2013 baler making dense full size 4x5's.
With the pressure cranked and full chamber bale size, I don't know if that's what's causing failures. Otherwise it's greased, oiled, blown off, probably over-maintained and religiously stored inside. Never wrapped hay.
I have a really good Claas dealer, too. (MM Weaver) They've been tempting me with a new baler, too.