Hi,

I bought a used La Pavoni Zip Base, but it needs clean up. I have problem in removing the bottom assembly. I follow this Deep cleaning of very dirty Mazzer Super Jolly, but I still cannot remove it.

As shown in this pic



and the assembly pic

,

there is a cochlea (0BECO9OC) under the bolt. I am not sure if I need to take it out before I can remove the bottom assembly. I have tried to take it out and I cannot remove it. The grinder is more than 5 years old and I believe the last owner has never service or cleaned it up. So, it has a lot of sticky coffee residues there. Even for the bolt above that cochela, I need to to a electric compact wrench to remove it.

Could someone who has cleaned up Zip Base before tell me how you take it out?

Thanks in advance.

I tend to use long screws that I thread through the rotating burr holder, lower, and push the rotator off the shaft. Don't twist the auger on the shaft as it is keyed and you will rip out the slot in the auger. I also use some old Ditting motor case bolts/studs that let me slide hammer a bit. Screw one into each hole in the rotator. Long stud with big nut lets you slide a crescent wrench up and smack each bolt/screw to get it loose. You can also take a plate and drill holes to match your burrs. You have the hole pattern in yur hand cuz you got the burrs loose. Lay plate across the top and thread three long screws into the rotator through your holes in the plate. Tighten each screw a little at a time as you go in a circle. This is a poor mans steering wheel puller. Elegant puller adds a center bolt to push on the armature shaft. I have a Bregant grinder that I'm throwing bearings at right now that has the same guts as your Zip.
jpboyt

Thanks for your reply. From that pic, that auger can be separated from the shaft. Do you mean I don't need to take it out first before I remove the shaft?

I am not a good mechanic, I am trying to figure out what you mean here:

I also use some old Ditting motor case bolts/studs that let me slide hammer a bit. Screw one into each hole in the rotator. Long stud with big nut lets you slide a crescent wrench up and smack each bolt/screw to get it loose.

I apprecipate if you have a picture showing what should be done.

I won't buy anything from La Pavoni anymore. Their support is sucked. Here is how they reply my question:

Date: Fri, 29 Jul 2011 14:14:27 +0200
From: espresso@lapavoni.it
To:

Hello,

unfortunately we have nobody who can help you.
We are going on summer holidays today. Please contact company Euroepan Gift.

Best regards
La Pavoni SpA

The part that you referenced as the "coclea" is what I called an auger. It is not part of the rotating burr holder. If you grab it gently with a pair of pliers or vise grips and rock it gently side to side while pulling up it will come off. It functionaly acts as a washer between the nut and the burr holder. Next step is to screw a long 5mm x .70mm screw into each hole, three screws, into the lower burr holder. Tighten each each screw evenly as in don't just crank one down and get the holder all jacked at an angle. You are trying to apply equal pressure with each screw. Upper armature shaft is tapered where it fits into the lower burr holder. You will hear a pop when the holder lets go of the shaft. A little bit of heat on the brass helps but if all this has left you confused you better leave the torch for another day. An electric heat gun will help and may be a better rookie tool. You can still burn your house down with the heat gun even if it doesn't have an open flame. Once the rotator pops off you can then turn your attention to splitting the case and taking out the motor. I assume that you are trying to replace the bearings as this is normally the needed repair if a grinder seldom is cleaned and has not had a steady diet of fresh burrs. What you may have not deduced from the schematic is that the top bearing is installed along with the shaft/armature from below. The rotator and nut keep the whole thing together and as the upper bearing carries most of the vertical loads. Lower bearing carries a small amount via a wavy washer.
jpboyt