Two employees were servicing a manual loading cartoner that is used to pack and seal oat bars. The machine's chain and sprocket system seized up. The equipment was locked out for maintenance. They then began jogging the machine from the control panel 20 feet away. This did not work so the injured employee tried to free the direct drive and cycle the motor when the machine energized and began rotating counter clockwise. This caught the injured employee's right index fingertip between the chain and sprocket resulting in amputation without bone loss.