John Deere D mystery bolt

slik

New User
There is a vertical adjusting screw/bolt with lock nut located in front of the oil level test cock. It shows up in Figure 31 of the operators manual, but is not labeled. Every time I see someone with a D I ask if they know what it is for, and nobody knows. Any one know what it does and how it should be set?
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So should I tighten the bolt against the shaft then lock it in place? I can't find any mention of this bolt in any manual I have.
 
The bolt was loose so I assume it should be tightened against the shaft. True? Thanks for the responses.
 
Yes tighten it up and lock it with the nut, also if you have an oil leak at hole that the shaft go in there is a soft plug that drives in agents the shaft
 

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