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I think you'll find that grease was specified for TR2, 3 & 4 trunnions -- later TRs called for oil.
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Right ! Not only that, the trunnion design changed considerably ... TR2-4 trunnions are generally NOT oil-tight.
The grease of the day had a definite tendency to harden and cake, the result could be poor trunnion lubrication. Modern greases are much better about this, so I don't see it as an issue any more.