A coupler for a backhoe or other excavator includes a frame including an upper portion and a lower portion. The upper portion is adapted to be secured to an associated backhoe or excavator arm. The lower portion includes a first hook adapted to mate releasably with a first associated attachment pin and includes a second hook adapted to mate releasably with a second associated attachment pin. First and second safety locks are movably connected to the frame and move relative to the first hook between an engaged position for capturing the first associated attachment pin in the first hook and a disengaged position for releasing the first associated attachment pin from the first hook. An actuator is adapted to move the safety locks selectively between the engaged and disengaged positions. First and second safety cams are provided and comprise respective cam profiles that respectively: (i) block movement of the first and second safety locks from their engaged positions to their disengaged positions when the frame and first and second safety cams are arranged in a first angular orientation relative to each other; and, (ii) allow movement of the first and second safety locks from their engaged positions to their disengaged positions when the frame and first and second safety locks are arranged in a second angular orientation relative to each other.