I am using NGLI 00 oil, specially designed for steering boxes... I realize now this is too fancy and expensive for a tractor! I used Napa Ultra Grey on the threads of the bolts, but apparently not enough... The problem seems to be also the threads on the large adjuster...

By gear oil I imagine you mean NAPA GL-1, but as I mentioned earlier, I am ready for corn head grease...
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Last edited by Philipj; 10/23/2021 3:24 PM.
Philippe Jeanneau