INJURED HAD JUST REPLACED A SHEAVE ON THE #1 REFUSE SCREEN DRIVE. IN AN ATTEMPT TO PUT THE BELT SON TEH HOOKED TO THE LIFTING EYE WITH CHAIN FALLS, AND ATTEMPTED TO PULL THE MOTOR OVER TO GET ENOUGH SLACK TO PUT THE DRIVE BELTS ON. THE LIFTING EYE BROKE WHILE HIS LEFT HAND WAS ON THE SHEAVE. SHEAVE FLEXED ABOUT 6"" CUTTING HIS HAND. NOT WEARING GLOVES.