TXJim: The cover T31170 was never made for the JD 3020 and JD 3010 tractors. It was used mainly on the Mannheim designed tractors. Then they did offer it for use in the JD 30 and 40 series tractors WITH adapter spacer #7. That was to make the stack height the same.
Now to your original question. The bolt is used in different tractors because the total stack height is the same. They have different covers to fit the different transmission recess. If you put a T31170 on a JD 3020 the cover is the wrong depth to work right. It is too tall so the filter is not sealed. Plus the bolt number R65894 was not used on the JD 3020 or JD 3010. Only the JD 4020 under 205000-. Then in a bunch of other later model tractors. This bolt is used with different covers.
Truthfully I never wasted enough time to figure all the different covers/bolt/filters out. I just usually drilled and tapped a hole in the cover and called it good enough. Most customers we had would have had a cow if we put close to $500 in just getting a return ported cover on a tractor.
About the only time I used a factory ported cover was if the tractor already had one.
Also I never welded a fitting to the cover. Just drill and tape 3/4 x 16 hole and screw the fitting in.
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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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