EMPLOYEE WAS HOOKING UP A BOX ROCK DUSTER TO A BATTERY POWERED SCOOP. HE WAS PLACING A PULL PIN IN THE HOLE. THE PIN WOULD NOT GO IN, SO HE TOLD THE OPERATOR TO PULL FORWARD, BUT HE WENT BACKW ARD AND THE VICTIM STILL HAD HIS HAND ON THE PULL PIN & IT WAS SMASHED AGAINST THE SCOOP BATTERIES.