THE FRONT HOUSING OF A 10X8 DENVER SLURRY PUMP TIPPED OVER ONHIS HAND AND ARM. HIS ARM AND LITTLE FINGER WERE BROKEN AND HE LOST THE TIPS OF HIS MIDDLE AND RING FINGER THAT WERE CRUSHED. THE P UMP HOUSING WAS SITTING ON A CONCRETE PAD AND WAS SUPPORTED VERTICALLY BY A CHAIN HOOKED TO THE BOOM OF THE MAINTENANCE LOADER. HE WAS REPLACING A NUT ON THE BOTTOM OF THE PUMP WHEN THE CHAIN