EMPLOYEE AND HIS PARTNER WERE TRASPORTING ROLL SHAFT FROM MIANTENANCE SHOP TO MAINTENANACE QUONSET BUILDING. THE ROLL SHAFT WEIGHS APPROX 2000 LBS. WHILE A 3RD EMPLOYEE WAS LOWERING THE SHAFT ONTO A WOODEN PALLET USING A FORKLIFT, THE SHAFT ROLLED OFF PALLET GAINING MOMENTUM. EMPLOYEE ATTEMPTED TO CONTROL THE SHAFT WHEN IT STRUCK HIM AND PINNED HIM TO THE GROUND.