I have not done a gear box on a NH 492 but have done them on the NH 488 and NH 489. If I remember correctly it was around a .005-.007 preload on the bearings.
I deliberately set them lose and measured the free pay/end travel. Then took out that amount plus the .005-.007.
The companies are making good money selling remanufactured parts. Plus many of today's techs are just parts replacers anymore.
Truthfully that gear case is real similar to the sickle drive box on the JD flex platforms or the JD 1209-1219 Mo-Cos. Have your JD dealer print you the adjustment page for one of those gear cases an it should be close enough.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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