EMPLOYEE WAS STANDING ON DOZER TRACK REMOVING THE LEFT SIDE ENGINE COVER TO DO MAINTENANCE. WHEN THE PANEL CAME LOOSE, HE LOST HIS FOOTING, FELL BACKWARDS OFF THE TRACK HITTING HIS BACK ON THE PUSH ARM, THEN LANDED ON HIS SHOULDER ON THEGROUND. PANELS ARE AWKWARD AND HELP IS SOMETIMESNEEDED. ALSO TRACKS CAN BE SLICK.