The procedure for changing blades on a Massey Ferguson Sickle Mower is relatively simple. First, begin by disengaging the mower from the tractor. Make sure that the mower is in a safe and secure position before attempting to work on it. Next, remove the screws holding the sickle bar in place. Take apart the sickle bar and remove the old blades. Install the new blades on the sickle bar in the same pattern as the old blades, paying close attention to the direction of the cutting edges. Re-assemble the sickle bar and re-insert all the screws. Once the blades have been changed, re-connect the mower to the tractor and you are ready to go!