WHILE REMOVING 400 T GEAR BOX FROM STAGELOADER BOOM & BOLTS WERE CUT TO REMOVE BOX. ONE BOLT IN MIDDLE BOTTOM OF BOX WAS NOT REMOVED. SO THEY BLOCKED UNDER GEAR BOX TO HOLD IN PLACE & CHAINED TO FORK TRUCK. FORK TRUCK WAS NOT STRAIGHT IN LINE WITH BOX & HAD TENSION ON CHAIN. WHEN LAST BOLT WAS CUT, THE BOX SWUNG AROUND TO LINE ITSELF WITH THE FORK TRUCK, HITTING EE, THROWING HIM IN