Rancilio Rocky and MD40 Burrs

Replacing the Burrs On Your Rancilio Rocky

1. Unplug your coffee grinder
2. Remove the bean hopper lid
3. Now with the hopper lid removed, observe the three screws which hold the finger guard in place. Loosen and remove the three finger guard screws. Remove the hopper from your grinder.
4. Now looking into the throat of the grinder you'll see a large brass part, that is the upper burr carrier. Unscrew the upper burr carrier by turning it counter-clockwise, lift it out of your coffee grinder.
5. The upper burr is generally pretty easy to remove. Unscrew the three retaining screws that hold the upper burr to the burr carrier and clean all parts thoroughly including the screws themselves so that they are completely clear of all coffee oil and ground coffee buildup. This will ensure that the replacement upper burr seats properly.
6. Now that the upper burr carrier and upper burr have been removed and cleaned. We will remove the lower burr which is attached to the motor. This can be a little more difficult to remove due to it being attached to the motor, it will move as you're trying to loosen it.
7. Remove the three screws on the lower burr carrier, you should be able to lift the carrier out and remove the burr. Repeat the same process we followed with the upper burr carrier being sure that all coffee oils and ground coffee residue have been remove from all surfaces.
8. Now in reverse of the steps outlined above put everything back together. When you're replacing the hopper, align it so it is somewhere close to the "0" mark on the dial this will help maintain some idea of where you need to start but the number doesn't really matter - it will likely be not near where your grind setting was prior to replacing your Rocky's burrs.