Abstract: A shaft-lock system has a mechanism-shaft clamp (1) with a first clamp jaw (2) hinged to a second clamp jaw (3) proximate a clamp pivot (4) that is disposed oppositely from a clamp lock (5). The first clamp jaw and the second clamp jaw are articulated for enclosing a mechanism shaft (6) cooperatively. The clamp lock includes a first-jaw indentation (8) that is positioned on a lock end of the first clamp jaw for being juxtaposed to a second-jaw extension (9) in a closed mode of the mechanism-shaft clamp. The first-jaw indentation includes an indentation aperture (10) and the second-jaw extension includes an extension aperture (11). The extension aperture and the indentation aperture are articulated for receiving a lock shackle (12). A clamp jaw includes shackle-guard walls (13) for guarding the lock shackle. The shaft-lock system includes a lock-shaft clamp (17) on the first clamp jaw and the second clamp jaw.