Some are a battle to free off, others just simply drop out with ease. May I suggest applying a jack under the ball joint and raising it slowly, this will relax the joint and the securing pinch bolt, apply some releasing agent and leave for a while. The other thing to also try is to steer the wheel to apply the pressure on the joint pin into a different zone of its position, followed by a few generous whacks with a decent hammer will see this yield eventually.
This problem is usually caused by repairers re-using the old pinch bolt and doing it up beyond its recommended torque. This has a number of effects,
1 the pinch bold shrinks at the shank that acts on the ball joint as the bolt stretches. This in-turn makes the joint clatter like hell no matter how tight you do the nut and bolt.
2 The hub where the ball joint enters the pinch zone has become deformed and too close together not allowing the joint to pass through it. (Once this has happened, it is unlikely to rescue any of the components affected by johnny big-boy's skillless operations.
If you still have problems, you will need to spread the jaws of the hub carrier to allow the joint to free away from the hub, but remember the likelyhood of it going back together properly and lasting any time is unlikely. Also the use of the proper nut and bolt is essential as it the correct torque setting which is far from tight tight in reality.
Hope this is of some help.
Good luck.
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