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BCG800 Grinder blocked by foreign object and now not grinding properly.

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  • BCG800 Grinder blocked by foreign object and now not grinding properly.

    Hi everyone, I am posting this FYI and perhaps somebody has already experienced this problem or can help out.

    I was grinding some beans on my BCG800 / BES900 combo today, which I am very happy with by the way, and the grinder started making a clicking noise and it was evident it had jammed. I removed the hopper and noted a small piece of metal that looks like a piece of broken machinery that somehow got into the beans between the tree and being bagged. It was smaller than the beans and didn’t do any visible damage to the burr surface which was a relief. I’m guessing there is some sort of release mechanism in the motor to help protect jammed burrs. The problem now is I suspect the calibration has been whacked. Firstly I cannot adjust the dose grind all the way to  the bottom of the coarse range, stopping about 8 marks from the coarsest mark. Additionally when adjusting to a fine grind, I note that there are still about 8 clicks of adjustment after the marker reaches the finest setting. The problem is, at the finest setting (and even with the adjusting knob at its rotational limit) I notice a coarse grind that despite maximal tamping pulls a 7-10s shot. Since I have had this machine I have routinely ground on the finer end of the scale (4th mark from the right) with moderate tamping force and dose volume set at –3 on a single shot basket and consistently got a 28-34s shot. Despite overloading the basket now and tamping as hard as I can on the finest I can adjust the grind size I cannot get anything other than short fast shot. I emphasise that the burrs look fine on close inspection, so there doesn’t appear to be a problem with them from my humble view.

    My question is, does the grinder need  adjusting /recalibration (above and beyong shimming) because the adjustment dial is now not synchronous with grind marks. And has anybody heard of similar happening previously. In this case, are there service centres in Brisbane that I can take the machine to?

  • #2
    Re: BCG800 Grinder blocked by foreign object and now not grinding properly.

    The ratcheting sound is the safety clutch activating because the burrs are jamming/ed. This can also happen if grinding hard beans (happened to me with some under roasted beans), but it only activated occasionally for a second or two.

    Are you sure you dont have anything stuck anywhere preventing movement of the lower burr through its entire range. Have you taken out the burrs and given everything a good clean?

    The other possibility is that there two nipples on the lower burr mounting plate, that correspond to two holes in the bottom part of the lower burr (so the shaft drives the burr through these pins). Perhaps when the burr was installed it was sitting on top of these pins and not on the lower plate? and when it jammed it turned and fell down onto the pins? This would be a major change in height of the burr though (3mm or so) and I would think if this occurred you would not be grinding anywhere near fine enough at all. Worth a closer look though, as it does sound strange.

    Cheers

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    • #3
      Re: BCG800 Grinder blocked by foreign object and now not grinding properly.

      Hi Artmam,

      It doesnt look like anything has moved internally that I can see. It was grinding well, with room to move on the fineness scale prior to this so I suspect the lower burr was located on the locating nipple as it should have been...there is only one nipple on my machine. I have taken the burrs out and cleaned them... all looks good and there is no damage to the burrs.

      What is confusing is that now the grind dial appears out of sync with the display. I can only get the grind marker to go to the 5th grind mark under the R of filter, and when I get the marker to the finest setting I can still advance the dial another 6-7 clicks. Even fully advanced I need to overload the basket and tamp like hell to get a shot that will run for 25s. And when I do this, loading the group head requires some force.

      Prior to this little jam episode I had minimal resistance loading the group head, tamping with moderate force and using significantly less dosage. In fact the dosage with my usual setup was quite sensitive and if I were to activate the grinder for 1s more, with consistent tamping, the machine would run 40+s shots so I had it sorted well to my liking with room to move on the grind size.

      If I go through my usual routine, all markers on the screen where they normal are, then I get a 10s shot that comes out with so much velocity that sometimes it runs outside the cup from the group head spouts.

      Weird...

      Comment


      • #4
        Re: BCG800 Grinder blocked by foreign object and now not grinding properly.

        Sorry missed the bit about the screen marking range being out of sync with the physical adjustment range. Maybe the out burr "skipped a cog " on its adjustment mechanism?

        Cheers

        Comment


        • #5
          Re: BCG800 Grinder blocked by foreign object and now not grinding properly.

          Agreed, I think it has slipped. I did try to move the outer burr using the dial now that I think of it, to try and take the load off the piece of metal to facilitate removal. perhaps it has skipped cogs. Getting a shim kit kindly sent by Phil McKnight to try and bring it back a bit.

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