I.E. stated I.E. was loading the flinger duster on the scoop bucket outby the section when I.E. backed out of the XC I.E. hit the rib with the bucket, when I.E. checked the functions on the duster, I.E. had a leak on one hose. I.E. got out of the scoop to tighten hose, while tightening the hose a small piece of the rib fell out and smashed I.E.'s small finger on scoop bucket.