When I took out my swing arm bolt, it was seized also.  I sprayed PB penetrating oil in it, let it sit for a day.  Then I sprayed it again and let it sit for a day.  Then I used my pneumatic air hammer with a tappered punch on it.  That thing wouldn't come off when I tried beating the shiz out of it.  But a couple seconds of an air hammer made that bolt slide out like butter and I didn't remove the shock bolt or lift or lower the quad.  It just needed to soak in PB for a few days and then air hammered free and you should be able to pull it right out.  Letting it soak in PB for a few days was key.  Be sure to hit the cracks between the motor and the swinger.  That was my experience.  Hope it helps.