Renault Midlum DXi190 7.5 2008 Kingpins

Hi has anyone any info on this models kingpins non greasable as both appear to have locked up. There was a comment on here that there fibre bushes ? Do they push out up or down. They seem to be locked in by a steel ring top and bottom but nothing to get circlip pliers on ■■? If anyone knows would be great to hear it
Thanks Arch

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