That looks like an old sicle bar, like we used, been near 60 years since I worked on one. But if I recall correctly the joint only comes apart in one position.
The actuator is too far back to remove the bolt, it needs to slide the teeth bar forward to line up with the large hole to remove the bolt compleatly. The bar needs to be level and supported to take pressure off that bolt. Check for a spring to hold the bar forward, some are spring loaded, if so push the bar forward and remove the spring before removing the bolt.
If you use an L shape flat bar with a nut just started, you should be able to tap the bolt out by tapping the flat bar.
Thse things are much fun to get back together, has to be aligned and on stroke.