I figured it out. I just took a better look with my flash light. I have a large mounting bracket fastened to my frame and casing for my backhoe attachment. Apparently I hit the stump hard enough that it shifted the mounting bracket just a bit to now block one edge of the mounting pin to slide out. I just need to loosen the backhoe mounting bracket and the pin should slide out.
Thank you all for your suggestions.
Thank you all for your suggestions.