Over-exertion (Not Elsewhere Classified)
REPAIRING BRAKES ON 16G MOTOR GRADER REMOVED WHEEL GROUP AND AS HE TRIED TO REMOVE SPROCKET FROM TANDEM, THE GEAR SLIPPED FROM INSIDE TO TANDEM MECHANIC GRABBED THE GEAR TO PREVENT HIMSELF FRO M BEING HIT AND THE WEIGHT OF THE GEAR WHEN HE GRABBED IT CAUSED HIS BACK TO BE SPRAINED.