your talking about the out rigger for the backhoe correct? An old trick if you arne't trying to salvage the bushings is to run a bead of weld on the inside on them causing them to shrink with the weld. If the pin is still in place, you can try heating the outside up with a torch. A sledge or slide sledge would be the next bet im assuming.
Can you post up a picture to try and explain things better?