I think corporate policies are simply different down under and probably in Europe too. I suspect the strong US consumer protection legislation prevents companies from requiring the sort of dealer service IronHorse insists is necessary to maintain a warranty. In general, US consumer protection laws are stronger than those elsewhere, at least when it comes to consumer rights and warranty issues. I have no trouble understanding that NH or any other tractor company would, given the chance, require the sort of dealer service IronHorse advocates but I think it is pretty clear the manufacturers cannot mandate that in the USA.
I did mine today at 55 hrs. Honestly the worst part was trying to hold the funnel from tipping while pouring out of a 5 gallon pail. lots of metal on the hydraulic drain plugs. Front diff drained slow since it was a little chilly. I bought one of those rubber tubs at the local TSC to work as a drain pan for the hydraulic fluid. worked great. Little tricky picking it up to pour into a drum after but that's what rags are for.
Any bolts in preticular you all have noticed need extra attention?
The real issue is not the fluids, which are pretty straight forward as you found out. The contentious issue here is the overall inspection and tightening of bolts and looking for anything that is amiss. Getting some advice from the dealer regarding what they look for in addition to changing fluids and filters would be a good idea.
My opinion is that what the dealer is looking for is something green and about 2 1/2 x 6" long. For me, it was important to get the fluids changed as scheduled since we have been getting pounded with snow and the dealer was backlogged. I couldn't wait two weeks and maintain a piece of mind that my tractor should continue to be used until they have time to do the service. I did not check any bolts but I will as time permits. At least the metal filings are out of the hydraulics...there were a lot! At least now if I can use the tractor knowing the fluids and filters are new. By all means, if money is no issue or you would rather the dealer take care of it go ahead but with all due respect you should know how to perform maintenance on your equipment.
I wonder how you would prove that there was metal in the hydraulics from new to make a warranty claim if the hydraulics had a failure at a later date ? Seeing how it was not found by the dealer at the 50 hour service and a record made . Like i said , they may fix it out of good will but in AUSTRALIA , they would not be required by law to do so .At least the metal filings are out of the hydraulics...there were a lot!