EMPLOYEE WAS OPERATING 70 TON HYDRAULIC CRANE. HE HAD LOWERED THE BOOM TO STOW THE JIB AND GOT OUT OF THE CRANE CAB. WHILE THE RIGGERS WERE GETTING TOOLS TO REMOVE JIB, THE EMPLOYEE STEPPED ON THE MULTI PART BLOCK AND REACHED UP. AS HE STEPPED DOWN FROM MAIN BLOCK HIS INDEX FINGER BECAME PINNED UNDER D RING ON JIB PIN, HE WAS USING A HAND HOLD. HE FRACTURED TIP OF BOTH BOTH FINGERS