Cold icy morning, conveyor was started to empty remaining dirt in feed hopper. EE positioned his truck approx 15 ft away from conveyor to investigate slippage occurring at head pulley. He stepped up on truck to get a better view and slipped off falling approx 5 1/2 ft. He dislocated elbow and cut his head on window shell during fall. Sling for arm & approx 6 sutures