Unless I was taking the hydro apart for another reason, I'd probably leave the shaft seals alone, too. (If it ain't broke...). There is very little movement of the trunnion shafts, so I don't imagine they wear the seals much. I've yet to see a leaking trunnion shaft seal, but, then again, I've only worked on 6 or 7 hydro tractors. So my sample may not be statistically significant...
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