EE WAS REMOVING PUMP AT WASH POND. A 4"" PIPE WAS ATTACHED TO A 6"" PIPE. THE FLANGE BOLTS HAD TO BE CUT OFF TO REMOVE PUMP. THERE WERE 3 2"" PIPES THAT BRANCHED OFF THE 4"" PIPE. A 410 JOHN DEERE BACKHOE WAS PUT IN LINE WITH PIPE. A CHAIN WAS ATTACHED TO BUCKET AND LOOPED AROUND PIPE. THE PIPE WAS MOVED AND THE CHAIN SLIPPED CAUSING THE 2"" PIPE TO HIT EMPLOYEE.