Weld a piece of keystock that fits the slot to a large nut. A quick burst from an impact will then easily spin the coupler off. Been a while since I've done this particular seal, but I think you then remove the small capscrews holding the seal in place and simply replace the seal. Seems to me that there may be another seal up there someplace you might as well change while you are in there... can't really remember, but by looking it should be self-evident.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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