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Thread: Help replacing the burrs of an (old) compak k8 grinder please!

  1. #1
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    Help replacing the burrs of an (old) compak k8 grinder please!

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Hello!

    I need some help. I bought a replacement burr set for my old compak k8 (see photo of half dissembled coffee grinder to double check). I thought that it was going to be easier to change them (as I saw the video that compak has available on the internet for the newer k8 model), but I get stuck in on of the steps of dissembling burr holder.


    I can take the first few 'layers' off but when I get to the point of taking out the actual burr holder (the one on top), the burr holder wouldn't rotate. I think that is because of two ad-hoc located pieces of metal that stop the burr holder from rotating (see photos). I have no idea of how to move these so I can take the burr holder out. I tried introducing these towards the axis of the grinder but that wouldn't happen and I haven't got a clue on how to do this. Please help me! I've been trying to sort this one out for a few hours but I seem to be stuck. Any help you can provide would be highly appreciated.


    Photo of grinder:
    https://drive.google.com/file/d/0B5F...it?usp=sharing

    Photos of burr holder piece that don't allow burr holder to rotate:

    1) https://drive.google.com/file/d/0B5F...it?usp=sharing

    2) https://drive.google.com/file/d/0B5F...it?usp=sharing

    Thank you in advance for your help!

  2. #2
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    I cannot see real well in those photos, but it looks like you have removed the top casing cover ( the part that you turn to adjust the grind),..and now you are trying to remove the upper burr holder and adjustment assembly .? correct.
    If so, you need to re attach the top cover and use it to un screw (clockwise) the burr adjuster assembly ( many turns) until the whole assemble can lift out from the burr chamber.

  3. #3
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    Thank you for your reply. I understand what you said. I've tried that before but nothing seems to be moving! The two little pieces of metal inside the groove seem to stop the burr holder to move.

    Have you dissembled one of these before?

  4. #4
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    Does the grinder adjust freely in normal use or is it tight to move ?
    They are normally tight and not easily turned without the top cap in place.
    Have you removed the adjuster stop/lock screw ?
    Most grinders unscrew in this manner.
    Note:- the metal guides in the slots are there to stop the burr from rotating, but the burr carrier (adjuster) will turn whilst the burr does not.

    Did you see this video ?
    https://www.youtube.com/watch?v=7rL8nMvjfGw

  5. #5
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    First of all thank you for your reply. Second, apologies for my ignorance as I'm new to this whole thing and seem to be a bit lost with your suggestions.

    The grinder adjusts freely when the adjuster screw is not tight (I have to loosen it to be able to adjust the grind size), otherwise it won't move. The first bit, which is what you call 'the adjuster', would come out easily (I loosen it by rotating it clock-wise), but is the metal part under this one (the one that actually holds the top burr) the one that wouldn't move and the one that has the metal guide slots and stop the burr holder from rotating (this is what is actually on the pictures).

    I can see this grinder is different from other compak models (as it has pieces that are not seen in manuals and videos I can find on the internet), that's why I was asking if you have experience with this model in particular.

  6. #6
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    did you get the machine second hand? it looks like the upper burr carrier is not attached to the adjustment assembly like it should be.

    those burrs should be lifting out straight up.

  7. #7
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    Hildy, yes, got it second hand. The machine was working fine for a couple of months, but since it was in a cafe before I bought it, I thought that changing the burrs was a good idea to improve the quality grind (with which I seem to be having some issues). Therefore, there doesn't seem to be pieces missing. I took out the adjustment assembly as it looks like is necessary to remove it to take the top burr holder, but I still can't remove it.

  8. #8
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    the upper burr carrier should come out with the adjustment assembly.

  9. #9
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    http://www.bouncecoffee.com/product_...8-features.png

    bottom right hand picture : have you taken the black plastic bit off without taking the bronze bit off? i think they're supposed to come out as a single unit.

  10. #10
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    Hildy, I when I read your suggestion I went 'this is not gonna work'. Despite, I gave it a try and it worked!

    I thought that the black plastic thing on top was not going to make any difference, but it did. I don't know how but it worked, now I want to figure out why it works. But you've helped me enough. Happy end story. Now I only have to change the burrs!

    Thank you!

  11. #11
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    Are you winding the carrier the correct direction , its left hand thread so clockwise to undo ?

  12. #12
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    You're welcome. As far as I can tell (my K3 is aluminium on aluminium, not bronze on aluminium) the black plastic bit attaches to the thread. This moves up and down when unwinding. The burr carrier is attached to the bronze bit in such a way that it can spin freely, but has springs preloading it down. the burrs screw onto the burr carrier.



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