once we felt a constant & nasty vibration, a few minutes later the "CSD low oil pressure" light illuminated. the captain didnīt wait for the checklist and expeditiously disconnected it...right after that no more vibration...the CSD was "autodestroying" and that caused a heck of a vibration..
A hydraulic pump partially closed could make a whole airplane shake as well...
Hope it helps,
SW.