I got a K2. Those wedges have to be pushed in and turned. You have to lay under it and roll the chain around to get the connecting link out of it too. The left wedge pin is behind the chain and you have to squeeze behind the wheel to even see something that's all but impossible to get to. On the Oliver, there's a coupler that slides in a hex shaft and two latch levers that you push and lock and that's all there is to it.
When we thought we had everything unlatched on the Gleaner, the left wedge had slipped back in and was bent a little from backing up trying to get out of it. I'll get it figured out eventually, but it'll never be as simple as the Oliver, or even the old F and G where you just took the connecting link out of a chain and took two bolts out of those blocks that locked things together.