MEMEBER WAS IN PROCESS OF CLEANING OUT THE PRE-DUMP ON THE DUST BOX. HE HAD THE MACHINE TURNED OFF AND USING HIS RIGHT HAND TO CLEAN OUT BOX. OTHER BOLTER CAME OVER TO HELP AND STRATED THE PIN NER TO CHECK THE DUST SUCTION THINKING. EE WAS FINISHED OTHER HIT THE LEVER TO ACTIVATE THE DUMP BOX NOT KNOWING HE HAD HIS HAND STILL IN BOX MEMBER INJURY HIS RIGHT WERE A LACERATION FROM KN