EE WAS WORKING ON A D68 DOZER ATTEMPTING TO LOCATE AN OIL LEAK. EE WAS STANDING ON TOP OF DOZER TRACKS AND LOST HIS FOOTING. HE FELL APPROX. 4 FT HE ATTEMPTED TO BREAK HIS FALL BY USING HIS AR MS AND HANDS HIS LEFT FOREARM FRACTURED WHEN STRIKING THE CONCRETE FLOOR.