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A friend purchased a Mazzer SJ (Mestre actually) and called me to set it up for single dosing. While we were dialing it in, we discovered the grinder stalls sometimes but it doesn't seem to depend strictly on the grind setting. By stalls I mean that when we start it with beans in the hopper, I can hear the motor run but the burrs don't rotate. In one of the videos the grinder was grinding but it was very slow and the sound it was making wasn't okay. I could also feel the grinding chamber get quite toasty. What could be the reason? The burrs are new and original, if this matters.

 

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[video=youtube_share;B0paB2UBR-M]

 

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[video=youtube_share;yrwqrg_sWSE]

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If the motor is running but the burr's are not spinning, that would seem to suggest that the burr carrier is slipping ??

The lower burr carrier is keyed to the shaft but only in one small key. It is not unknown for people to put the carrier on in the wrong place

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agree easy for someone to put the burr carrier on without lining up the notch in it with the roll pin through the shaft - looking at your video the adjustment collar is sitting quite high and not as far down as usual - so quite possible the notch is not lined up.

all opinions are my own I have not received any free equipment or favours from suppliers 

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? Two capacitors but using only one ? Try switching over to the other one.

The SJ also needs a 16uF capacitor.

The two capacitors seem to be connected to each other with two brown wires. Maybe the two connected together make 16uF?

 

The burr carrier misalignment makes sense. I've never removed it on my Mazzer so didn't know you need to align it.

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Don't take the burr carrier off, just put a new capacitor in. Logically the burr carrier slipping cannot be the problem. In the first video it clearly spins the burrs (barely), in the others you can hear the motor is not turning, because there is insufficient starting/run torque.

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Quite often it runs without any slowdown, hesitation etc so it's an intermittent problem.. Forgot to mention this.

 

The capacitor thing makes sense and it was what I first thought of but wouldn't the problem be present at every start if it was at fault? @DavecUK where can I get a capacitor for the SJ? I found a thread on HB which says the OEM part is Ducati Energia 4.16.27.19 but I am not able to find this online.. neither a "Mazzer Super Jolly capacitor" on Google.

Edited by bronc
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here - https://espresso-solutions.co.uk/diagram?view=Mazzer-Super-Jolly-Major

 

£6 for a SJ 220V 10UF

 

Might not be the exact make of the original but its the right rating

all opinions are my own I have not received any free equipment or favours from suppliers 

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Quite often it runs without any slowdown, hesitation etc so it's an intermittent problem.. Forgot to mention this.

 

The capacitor thing makes sense and it was what I first thought of but wouldn't the problem be present at every start if it was at fault? @DavecUK where can I get a capacitor for the SJ? I found a thread on HB which says the OEM part is Ducati Energia 4.16.27.19 but I am not able to find this online.. neither a "Mazzer Super Jolly capacitor" on Google.

 

Not always no, it can be intermittent and gradually get worse. just go on ebay and get a suitable capacitor for 5 or 10 quid....probably something like this.

 

https://www.ebay.co.uk/itm/Cylinder-Shaped-CBB60-10uF-450V-AC-Motor-Run-Capacitor-for-Washing-Machine-HS838/264020269753?epid=12022714683&hash=item3d78d59ab9:g:dpAAAOSwgYdb3LLp:rk:78:pf:0

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