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 - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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