MINER WAS HAULING MUCK FROM THE MINE TO THE SURFACE. STEERING CYLINDER SUPPORT BROKE & BUSTED THE TRANSMISSION HOUSING & RIPPED OUT THE BRAKE LINES. THE EQUIPMENT ROLLED BACKWARDS ABOUT 60-75' STRIKING THE WALL. THE SUDDEN STOP GAVE THE EE WHIPLASH. DOCTORS RELEASED HIM TO FULL DUTY. HOWEVER HE STATES HE IS HAVING HEADACHES & CANNOT RETURN TO WORK.