Emp was operating Volvo end loader when he noticed a flash as he dug into pile of rock. He continued to operate when he noticed black smoke. He then realized a hydraulic line broke and was smoking. He retrieved the fire extinguisher mounted on handrail of loader and bumped his Rt. elbow on handrail. He was sent to Occ Health on 6/4/14 he received restrictions of no work Rt. arm.