Include

[Rick M]

If possible you might consider trying to loosen the nut then have a helper either turn the bolt or pump the handle while you do the opposite. That scuffing may scrap off the hardened bit of grease/dirt/rust that is plugging the hole. We just did this on a friend's disc this past weekend. Out of the eight axle mounts only two would not take grease no matter how hard he pumped so I started turning the disc gang while he kept the pressure on, both broke free within 4 to 6 revolutions. I'm old he's younger by 15 years and remarked he learned something new, it was just something I had picked up over the years. Maybe a similar approach will work on your pins.