EMPLOYEE WAS HELPING MAINTENANCE MAN REMOVE THE DRIVE GUARD FROM THE QUICKLIME SECONDARY CRUSHER AT OUR OLD PLANT SITE. THIS IS A LARGE AND HEAVY GUARD. THE UNBOLTED GUARD SLIPPED FROM ITS MOU NTING BRACKET FALLING ONTO EMPLOYEE'S FINGER. THIS RESULTED IN A FRACTURE OF THE TIP OF THE FINGER AND A LACERATION REQUIRING 5 STITCHES. EMPLOYEE RETURNED TO WORK AFTER LEAVING HOSPITAL.