A subcontracted engineer was advising maintenance how to make a modification to the embossing roll system on a new line. Maintenance was bringing the motor and gearbox down with a crane. The load shifted when it was a few inches from the ground. The engineer went to catch/maneuver the gearbox and the fingers on his left hand were crushed between the I-beam base of the gearbox and the concrete floor. A finger was amputated.