Use a roll pin punch (somebody got a pic? I don't) and if you've peened over the ends of the pin, you'll need to grind them flush with the coupler so you aren't trying to force the peened-over end through the coupler. Use a decent-size hammer. On some tractors, it is easier to get them out from underneath. On a NF without a creeper, that's probably the only clear shot you have at it.
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