FELL OFF TOP OF 2769 CAT HAUL TRUCK AND BROKE RIGHT WRIST. EE WAS ON TOP OF ENGINE COMPARTMENT AREA CHECKING FLUID LEVELS. WHILE MOVING TO THE DRIVER SIDE CAB DOOR, HIS RIGHT FOOT SLIPPED OUT FROM UNDER NEATH HIM AND HE FELL ON HIS RIGHT SIDE. THE FRACTURE WAS NOT A COMPOUND FRACTURE.