Replacing burrs of Rancilio Rocky grinder

Grinders are one of the keys to exceptional espresso. Discuss them here.
BuzzedLightyear

Postby BuzzedLightyear » Aug 19, 2007, 9:47 am

Anybody have a step by step guide for replacing burrs of a Rocky grinder? Thanks in advance.

User avatar
TimEggers

Postby TimEggers » Aug 19, 2007, 10:19 am

Hi Buzz,

Yeah it's simple:

1) Remove hopper lid.

2) Remove the three screws which hold the finger guard in (these also hold the hopper on).

3) Lift hopper straight off of grinder. (You can remove the stop screw on the bottom of the hopper so that in the future you can simply depress the locking tab and unscrew the entire hopper to remove the top burr.)

4) Unscrew the top burr assembly (the large brass part). Turn it in the same direction that would make the grind coarser (clockwise I think, but I don't remember for sure).

5) Both burrs are held in by three slotted screws on each burr. Remove screws to remove burrs and replace. Clean machine as needed before reattaching the new burrs.

Follow the steps above backwards to reassemble.

To get the grinder back into the proper range with the unit unplugged turn the upper burr assembly (after you have the new burrs on) all the way down until it touches the bottom burr. Back it off a little (now align your hopper as best you can so the screws go back in so the numbers are close to the "0" on the dial. This will assure your burrs are close enough together to make the number relevant (like they were when the grinder was new). Once I put the hopper on but the burrs were too far apart and even at what used to be zero the grind was very coarse.

Replacing the burrs is very simple and should be no problem, good luck!

User avatar
Randy G.

Postby Randy G. » Aug 19, 2007, 11:38 am

With a bit more detail, just in case someone needs it:

1- Unplug the grinder.

2- Remove hopper lid.

3- Look down into the bean hopper and remove the three screws which hold the finger guard in Place. Once removed the hopper can be lifted off the grinder.

4- For future benefit, remove long screw protruding from the bottom of the hopper. Wit that screw removed, in the future you can simply depress the locking tab and unscrew the entire hopper and top burr as a single assembly without the use of tools.

5- Look down into the grinder- that large brass part is the upper burr carrier. Unscrew it counter-clockwise and lift it out of the machine.

6- The upper burr is easy to remove. Unscrew the three retaining screws which hold it to the upper burr carrier. Using the proper size screwdriver is important. Lift the burr off the carrier and thoroughly clean the carrier and its threads so that there is NO coffee residue or oils left. The new burr must sit perfectly flat. Clean the screws the same way and torque them in place, working slowly in a circle to get them seated evenly as you go.

7- The lower burr is mounted to the carrier that is attached to the motor. This one is a little more difficult because it can turn in response to the torque applied to the screw. You can use a 1/4" drive "Tee" handle socket, a 6" extension, a 1/4" socket, with a hex screwdriver bit. You can even have someone else push down on the handle while you turn the handle.

8- Once the three screws have been removed the lower burr can be removed. One again, remove all traces of coffee residue in there, including the threads for the upper burr carrier. The new burr must fit perfectly against its mount. Tighten the three screws in the same was as mentioned above.

9- CAREFULLY screw the upper burr carrier back. If you place it flat into the bore, then carefully turn it counter-clockwise until you feel the first thread "click" into place, and then turn it clockwise it should start easily. DO NOT cross-thread! Screw it in until it stops then back off about .5". Align your hopper as best you can so the screws go back in so the numbers are somewhere close to the "0" on the dial. Be aware that it is possible that the new grind number may very well be different then the old grind number. It doesn't matter.
Espresso! My Espresso!
http://www.EspressoMyEspresso.com

Jarno

Postby Jarno » Aug 19, 2007, 12:52 pm

Randy G. wrote:With a bit more detail, just in case someone needs it:


4- For future benefit, remove long screw protruding from the bottom of the hopper. With that screw removed, in the future you can simply depress the locking tab and unscrew the entire hopper and top burr as a single assembly without the use of tools.




I think the purpose of that screw is to keep one from screwing the hopper to less than '0', thus keeping the burrs from grinding against each other.

User avatar
HB
Admin

Postby HB » Aug 19, 2007, 1:56 pm

Really? It's been a long time since I used a Rocky, but a similar safety screw doesn't prevent the burrs from touching on Mazzers or Macaps. I believe its purpose is to limit the travel of the burr carrier if it binds on rocks or something, which otherwise could allow the motor to forcefully unscrew the burr carrier.
Dan Kehn

edna713

Postby edna713 » Aug 19, 2007, 3:39 pm

You are correct Dan. If that long screw is NOT there, and a user presses the adjustment unlock button with the motor running?

The entire top of the grinder will unscrew itself in about 1.6 seconds. (an approximate timing)

And, if I may, a suggestion for any brand new rocky owners: as you unpack it from the box, remove the top lid, invert the grinder and give it a good shake and a slap on the side.

Very occasionally, someone at the factory may throw in a spare loose screw for the burrs. If left in place, and the motor operated, it will instantly destroy the burr set. A bad thing! :shock:

d

BuzzedLightyear

Postby BuzzedLightyear » Aug 20, 2007, 11:45 pm

Thanks for the tip guys!

I could not believe how simple it was! I wish restoring Hot Rod's where this simple.

I was disappointed in seeing how small the burrs where. However the burrs where long overdue for a change. My first shot was amazingly good and made me realize I need to make sure I replace them every 75 pounds.

By the way a 12mm socket works better than a 1/4 inch socket to hold the lower burr still.

User avatar
Randy G.

Postby Randy G. » Aug 20, 2007, 11:54 pm

By the way a 12mm socket works better than a 1/4 inch socket to hold the lower burr still.


I meant to say a 1/4" drive socket... Sorry for the confusion..

And there are all sorts of stupid things that people can do to screw up an espresso machine (or just about anything else for that matter). Take out the screw and use some common sense and all will be well. It is no more dangerous having that screw out of Rocky than it is to backflush your espresso machine... if they are done with common sense, all will be well.
Espresso! My Espresso!

http://www.EspressoMyEspresso.com

User avatar
jesawdy

Postby jesawdy » Aug 21, 2007, 8:38 am

Jarno wrote:I think the purpose of that screw is to keep one from screwing the hopper to less than '0', thus keeping the burrs from grinding against each other.

edna713 wrote:You are correct Dan. If that long screw is NOT there, and a user presses the adjustment unlock button with the motor running?

The entire top of the grinder will unscrew itself in about 1.6 seconds. (an approximate timing)

HB wrote:Really? It's been a long time since I used a Rocky, but a similar safety screw doesn't prevent the burrs from touching on Mazzers or Macaps. I believe its purpose is to limit the travel of the burr carrier if it binds on rocks or something, which otherwise could allow the motor to forcefully unscrew the burr carrier.



I don't think the screw will prevent the burrs touching, when you change the burr set, the screw will be in a different orientation to where the burrs are touching. I suppose that the safety aspect of the burr unwinding itself is the real answer, but I always thought it was there so that people don't have "idiot" moments and turn the scale more than one revolution and get the thing 360 degrees (or more) out of whack.
Jeff Sawdy

Beavis

Postby Beavis » Aug 21, 2007, 3:18 pm

How do you know when the burrs need replaced? I've had Rocky for about 3 years, grind once or twice generally for 10 seconds most days. Am I close to being in need or do these burrs last 5 + years? Where do you buy the burrs?
Thanks, Beavis