Removing Super Jolly lower burr carrier

[lilotaku]

Hello,

I'm fixing up an old mazzer SJ and i was wondering if the lower burr carrier is pressed on. I removed the single bolt that holds it into place, but i can't seem to pull the lower burr carrier out. Any ideas on how to pull it off? This thing is caked with old coffee probably from years back and i wanna try to get this thing thoroughly cleaned everywhere and give it to a friend as a gift. Thanks for any help in advance.

[lino]

Yep, it's pressed on. That one's a bit of a bugger to get off.
I've taken apart several SJs, but I can't remember how I got that part off.

It's too tight to get a puller in there.

I think I didn't worry about it, and it came off in the process of pulling the motor shaft out of the upper bearing.

Hope that helps.

Oh, and if you think it's dirty on the top side....


ciao

lino

[Psyd]

Hello,

I'm fixing up an old mazzer SJ and i was wondering if the lower burr carrier is pressed on. I removed the single bolt that holds it into place, but i can't seem to pull the lower burr carrier out. Any ideas on how to pull it off? This thing is caked with old coffee probably from years back and i wanna try to get this thing thoroughly cleaned everywhere and give it to a friend as a gift. Thanks for any help in advance.

Of you '*have* to take it off, you could get a puller at 'Kent's Stolen Tools' on Grant, just west of the Harley shop (something tells me that you know where the Harley shop is, I dunno what...) at Sixth. Tripod puller, and some longer bolts to go through and thread up to the carrier (where the burr usually gets screwed in and then just screw the center bolt on the puller in until it comes loose. Let me know if you decide that you have to do it, and I may buy the puller off you afterwards to keep it cheap for you.
Izzit going to anyone I know?

[lilotaku]

I did end up getting the lower burr carrier out by using my burly phillips head screw driver and a mechanics hammer. I just shoved in the screwdriver head right below where the shaft meets the burr carrier, gave the handle of the screw driver a few taps and I was good to go. Lino, you were right, their was some pretty nasty caked on goo in there. I'm pretty glad i took the carrier out, i have no idea how many years the cruds been there. The smell alone was pretty pungent/rancid.

lol, Psyd I am quite familiar with "kent's stolen tools", I've bought a few tools from them in the past. Its ghetto, but you'll be surprised at what tools they have around when you need them. I believe the store you might be talking about is the one with the huge table grinder sitting outside rusting. As for who its going too, its for a highschool buddy that graduated with me at Mt. View High school back in 98'.

[Psyd]

I just shoved in the screwdriver head right below where the shaft meets the burr carrier, gave the handle of the screw driver a few taps and I was good to go.

?!?! I'm having a bit of a time visualizing this, and I'm a bit of a freak when it comes to taking tool steel to the guts of my grinder. Post a pic of where you placed what and who you hit with whom?

I am quite familiar with "kent's stolen tools"
Its ghetto, but you'll be surprised at what tools they have around when you need them. I believe the store you might be talking about is the one with the huge table grinder sitting outside rusting. As for who its going too, its for a highschool buddy that graduated with me at Mt. View High school back in 98'.

That's the one. Just a few blocks from my house, so I can go get whatever (and I do mean whatever) I need whenever I need it. And I have the advantage of getting just one of them, as opposed to a whole set. Pullers and such being the example. It's like an adult's toy store in there!
Not a guy named Bill, by any chance (hoping that my friend Bill has a grinder on the way with almost no effort on my part)?

[lilotaku]

The screw driver that i used fits right into the coffee exit chute, where the coffee goes into the doser. I put the screw driver in till it hit the area under the burr carrier where the shaft meets it. I then just tapped down on the screwdriver handle and out popped the carrier. A little bit of a scratch under the burr carrier, but other than that, nothing was damaged. I'm afraid i do not know this Bill that you talk of. The only Bill i know in Tucson is some old guy who plays paintball over at Sudden Impact out on Tangerine/I-10.

[Paul_Pratt]

Jamming things in may cause damage to the shaft. An easier way is to use long bolts and tighten them in sequence. The bolts push against the main body and force the carrier off. The risk of damage is low because the amount of force required is very small.

See pics.

[jesawdy]

Jamming things in may cause damage to the shaft. An easier way is to use long bolts and tighten them in sequence. The bolts push against the main body and force the carrier off. The risk of damage is low because the amount of force required is very small.

Very clever, Paul. Thanks for sharing. (BTW, what sort of grinder is that?)

[Paul_Pratt]

La Marzocco Vulcano grinder. sometime between '68-'80.

[lilotaku]

Very clever, Paul. Thanks for sharing. (BTW, what sort of grinder is that?)

I agree, I'm definitely going to use that method next time. Looks a lot easier to do as well. Thx for the big tip, it'll definitely come in handy in the future.

[SJM]

An easier way is to use long bolts and tighten them in sequence. The bolts push against the main body and force the carrier off. The risk of damage is low because the amount of force required is very small.

Brilliant ! I wish I'd seen this before I took the bottom burr out of my Rancilio MD50 yesterday. I didn't do any damage, but your solution is sooooooo elegant !

Susan

[dingrr]

Holy @#$%!

I've been searching for a solution to this (mostly on CoffeeGeeks) and was just about to have someone machine a special puller for me and here is this beautiful description on how to get this part off without prying or hammering. Excellent! Now that that lower burr carrier is off, I unscrewed three screws from beneath it and the motor still does not come out the bottom. Arrrgh! I can see two additional screwheads that catch the motor windings but the armature should slide out, no? That should give me access to the last two screws.

Mine is a Mazzer Super Jolly.

Thanks so much!

Dan

[jesawdy]

Now that that lower burr carrier is off, I unscrewed three screws from beneath it and the motor still does not come out the bottom. Arrrgh! I can see two additional screwheads that catch the motor windings but the armature should slide out, no? That should give me access to the last two screws.

Mine is a Mazzer Super Jolly.

Dan, you're going to think I am crazy, but I believe you have to place the grinder in an oven to get the motor out... seriously. I haven't done this, and I don't suggest it, but that's what I recall reading.

[HB]

I remember too... Mazzer super jolly - what are signs of motor/bearings on the way out?

You're probably right about the bearing, that sounds like one of the Tagex grinders that Lino et al bought. He replaced a bearing for a few bucks and was off to the races. But keep in mind that he's Mr. Handy Extraordinaire. From what he said, getting the motor in and out was a pain because it's pressed into the shell.

It is a pain to press the motor in and out. Sean Lennon suggested a much easier method. Heat it up.
Put the grinder in the oven at a lowish temp 250-300, and wait till you hear the clunk...

BUT... You don't need to get the coil out to change the bearing.

You'll still need to pull/press the lower bearing carrier, and possibly the upper bearing - either off the shaft or out of the housing, or both. A nice cheap puller set or two from Harbor Freight, or the like, works well as you can mix match and grind the tool to fit your needs.

The bearing was about $7 from Enco, if I remember right. The original bearings in the SJ were shielded, not sealed. I replaced them with sealed and it's slightly louder (than a working shielded one), and spins down faster. Seals add friction and noise. The SJ design does a reasonable job of protecting the bearing so it doesn't need seals.

ciao

lino

[lino]

Yeah, what he said...

I've used a puller the couple times I've done it, so I can't speak with experience about the heating method.

The puller is a bit of a pain because there is very little room on the far side to grab anything, all the coils wires are in the way.

I ended up making a puller out of some bar stock and various bits of a few pullers or maybe it was just out of a couple pullers.


Before you take the motor stator (coil) out, you need to get the lower bearing carrier out, I believe jacking bolts can be used (as per Paul's suggestions about the burr carrier), but you have to fight the bearing if it stays stuck on both the shaft and the carrier.

Once that's out, then you can gently tap out the rotor and shaft from above. (tap from top, exit bottom).

Then the upper bearing can be pressed out or the stator pulled out. If you heat it, don't get it too hot, cause you'll have a bunch of wires in there. You certainly don't want to melt any insulation in the core (but they can typically take pretty high temps).


Hope that helps a bit...

ciao

lino

[dingrr]

OK, I talked to a guy at work and he'll take it to his friends shop to see if they can press it out. I'm busy roofing the house so I have little time for this project right now.

[IronBarista]

What size bolts are they? I'm thinking maybe M3 or M4 thread. I would like to get a few short of having to take one out and comparing the size.

[Psyd]

Maybe it's just me, but if this is the method to get the carrier out, anyone have any experience getting it back in? Will it seat just fine by tightening the top bolt, or does it need some other additional persuasion. One of the Majors is wrong (it grinds just fine, thenkeweverramush, but it does it on eight, whereas the 'real' setting should be around two) and I'm suspecting that the coffee tinkerer I bought it from may have disassembled it and reassembled it incorrectly. Tagex may have played a part in its history, but I got it cheap enough that I really don't care too much about much other than it does grind espresso as well as my 'real' Major. Slightly odd noise, and adjustment wheel settings that don't correspond to any other Mazzer I've ever seen are the only real differences between this and any other Major.
Still, if I were comfortable with the thought that I could get both apart and back together without hurting myself or the grinders...

[lilotaku]

Psyd,

Their is a "key" in which the lower carrier specifically fits into. The shaft has a pin that goes through it perpendicularly and the lower carrier is notched to go over those pins. I did have to carefully align the carrier and did have to take a small rubber mallet and persuade it in. I don't think just tightening the bolt is gonna do the job, it needs a good bit of force to get fully seated. I'm sure you can easily see what i mean when you take the carrier out. real easy to get out and back in.

[Psyd]

I did have to carefully align the carrier and did have to take a small rubber mallet and persuade it in.

Now see, somehow I don't see no Eye-talian fine technicians banging on the mechanical works with a hammer to get 'em apart or together. While that may pose absolutely no threat to something as beefy as my Majors, I'm still cautious...