Rocky Grinder - Separating Chamber from Rotor Shaft

Equipment doesn't work? Troubleshooting? If you're handy, members can help.

#1: Post by DnstrDan » Oct 12, 2019, 7:51 pm

Yesterday, my Rancilio Rocky made a pronounced oscillatory sound that it had never done before. Today, it failed. The motor still labors when I pulse it on, but barely turns. (This failure was likely induced by me when I applied a small amount of Cafiza cleaning solution to the grinding chamber to clean it out. Won't do that again.)

So I took it apart as far as I could go. I lifted the rotor from the motor stator assembly, then from the grinding chamber I removed the circlip and three washers underneath. I can twist by hand the chamber against the rotor but there is considerable stiffness and binding.

What is the proper way to separate the grinding chamber from the rotor shaft? I'm tempted to use either a hammer and drift pin on the center shaft, or a bearing pusher/puller that I'd rent from a local auto supply shop.

And should I scribe the alignment between the two parts for dynamic balancing upon reassembly?

Supporter ♡

#2: Post by ira » Oct 12, 2019, 8:44 pm

I never took mine apart, But this person did and maybe there are hints in this thread:

How I aligned my Rancilio Rocky.



#3: Post by DnstrDan » Oct 13, 2019, 1:47 am

Ira - thanks for the lead to the post by coffinnate, but he didn't explain how he removed the grinding chamber from the rotor shaft.

I think this post provides more tips: Mazzer Super Jolly bearing removal tricks: My grinder rebuild

I'm honestly surprised that no one has posted on this topic before. Not many folks apparently tear their Rocky completely apart.