THE EE WAS IN PROCESS OF PULLING A BRAKE ASSEMBLY APART WHEN THE ACCIDENT OCCURRED. THE EE WAS POSITIONED SO HIS LEFT FOOT WAS FORWARD CLOSEST TO THE BRAKE & HIS RIGHT FOOT SLIPPED ON OIL CAU SING HIM TO FALL BACKWARD SO HIS BACK LANDED ON THE MAIN PUMP INLET PIPE & THE BRAKE ASSEMBLY FELL DIRECTLY ON TOP OF THE EE. THE RESULTANT ACC CAUSED A BRUISED LEFT FOREARM & RIGHT KNEE ALONG