The side of the pin with the bolt is tapered. You can try to tightened it first then put a load on the Pim with the bucket then use an impact to remove the bolt. Once the bolt is out you need to remove the grease fitting in the opposite side. The pin gets pushed towards the grease fitting into a cavity on the qa. The cavity is probably filled with old dried grease so some brake fluid will help a lot to het it cleaned out. It will take some work to get enough of the old grease out to get the pin to move far enough.
Horrible design.