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Thread: Replacing Breville BCG800 Ground Coffee Impeller

  1. #1
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    Replacing Breville BCG800 Ground Coffee Impeller

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Firstly I would like to thank CS member "Simulacrum" for his link on page 26 of Breville BCG800 Coffee Grinder thread to the "Ifixit" Guide To Replacing the Impeller. I have just replaced my very worn impeller with the 3D printed nylon one which was recommended in the "Ifixit" Guide and found it to be an excellent fit.
    The fitting instructions are very easy to follow and well illustrated. The only tool needed that maybe difficult to find is a 5 mm diameter x 210 mm long shaft Phillips screwdriver.
    I managed to get the assistance of my Avionics Aircraft Engineer BIL to make one for me.
    The worn impeller was 41 mm diameter instead of 45 mm which was enough to make the grinds not enter the exit shute and hence clog the grinder.
    The cost of the part with express shipping from USA was approximately $50 and well worthwhile. The original impeller lasted for approximately 60 kg of coffee grinding.
    I wonder how many other Breville grinders have ceased working for this reason.
    Happy grinding
    Herbie.

  2. #2
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    Since doing this repair my grinder motor is not laboring and sounding as if it is under powered and it is working like new again.
    The worn impeller symptoms slowly sneak up on you and I did not realize that the motor laboring was due to the difficulty of getting rid of the ground beans until the exit path was totally clogged.
    The moral of this story is if the motor is laboring and you can see the tips of the impeller (underneath the bottom burr) then it is impeller replacement time.
    I am glad I did not go out and buy a new grinder.
    Herbie.
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  3. #3
    Senior Member prydey's Avatar
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    I just suffered the same failure of my bcg800. i got 4 years out of mine @ roughly 1kg every three weeks, so similar usage to herbie.

    a quick google informed me that the only option was the 3D printed replacement from the states, or a new grinder. I'm not rolling in the coin, so the only option for a new grinder was the bcg 820 'pro'. who doesn't like new toys right?

    the dose control timer is a nice touch, and the impeller is now metal. sure its an extra $150 more than a repair, but its a new grinder. i may look at repairing my old one as a back up.

  4. #4
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    I can add that I did the same to my Breville grinder only last week, except I ordered two impellers seeing as the freight was the same. The machine certainly works like new, if not better. I'm sure there will come in the future a metal version, but these plastic 3D printed ones will see my grinder out....
    Last edited by namartinnz; 3rd October 2016 at 12:44 PM.

  5. #5
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    Struck the dreaded 'racheting' noise a couple of weeks ago and have been struggling with my grind ever since. Grinder is about 4 years old and has been great - even without the shims. I've placed an order based on the link from simulcrum as you suggested (page 26: http://coffeesnobs.com.au/grinders/2...-26-print.html) The video accompanying the person who is producing the replacement part is very comprehensive and the feedback from you guys and elsewhere online is positive. Delivered is under $40.

    On a similar note. Does anyone know if the burrs in the BCG800 ever need to be replaced? I wondered if the wear on the metal teeth might be causing issues - although metal vs. roasted beans I would have thought the burrs should last decades

    I've had to create a new account after not visiting CoffeeSnobs for awhile - glad you're still here, this fix will make me a very happy man. Thanks!

  6. #6
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    Hi again. I thought in the interests of knowledge and experience sharing that I should expand on my last post. My part arrived in due course ( can't remember timeframe). My experience in replacing my worn impeller taught me this: your longest Philips head a screw driver will probably not be long enough - buy one about a foot long. Step 10 of the repair tutorial mentioned in the post above suggests clearing the exit chute - do this! I had some trouble getting into this chute - careful levering with a small flat driver worked in the end, but I had to disassemble the whole grinder again when I realised I skipped this step and my chute was partially blocked. The grind seems to go much finer with the new part installed - I've backed mine down to underneath the 'o' in espresso, while I used to have it set almost as fine as it would grind. The fibrous washer mentioned in step 9 was damaged - I threw mine away as suggested (against my instincts) and haven't struck any issues 2 months on.

    That's it. Good luck!
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  7. #7
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    Why do you need to dismantle the BCG800? The impeller just drops out of the grinder if you turn it upside down, and I have also found that the metal covered impeller from the one year-old BCG820 Pro which I also have is equally easily removable and drops into place in the BCG800, as does the adjustable upper burr carrier. I haven't gone as far as actually trying the grinder out, but the parts do seem to be interchangeable. What I did notice though, was that the felt washer which presumably stops the coffee grounds getting into the drive shaft bearing was very worn and needs replacing. Wonder whether Breville can supply one?. This has allowed coffee grounds to build up under the impeller. Having cleaned all this out, the BCG800 is grinding satisfactorily again, although I suspect the motor is labouring a bit more than my year-old 820.
    I never attempted to take the impeller out having understood that it was impossible to remove and replace from the top, but it's obviously not. The impellers just fall out of both the 800 and 820 models. Am I missing something???

  8. #8
    Senior Member prydey's Avatar
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    Quote Originally Posted by Allen View Post
    . The impellers just fall out of both the 800 and 820 models. Am I missing something???
    Yes, you are missing something. The impeller in the 800 only drops out that way when it's worn. A new one won't go in that way, and a new 3d printed one definitely won't.
    If the impeller can be removed without pulling the grinder apart, it is clearly well worn.

  9. #9
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    Quote Originally Posted by prydey View Post
    Yes, you are missing something. The impeller in the 800 only drops out that way when it's worn. A new one won't go in that way, and a new 3d printed one definitely won't.
    If the impeller can be removed without pulling the grinder apart, it is clearly well worn.
    That puzzles me, because the metal tipped impeller in my new grinder, as I said, drops out without any trouble, and fits into the 800, but I admit that I have not checked that it works. I would never have known this had not a friend with 3 820s (!!!) told me that you could lift the impeller straight out. Might swap the impellers over and see what happens. I'll also measure them with a micrometer. But even if the impeller from the 820 works in the 800, I don't suppose Breville will supply me with the part. Might be worth a try though.

    Just ordered a nylon one from Shapeways anyway. Au$50 incl postage (Au$21.00 !!!)
    Last edited by Allen; 4th January 2019 at 12:39 AM. Reason: Updated

  10. #10
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    @Allen how did it go when you swapped the smaller metal impeller into the 800? Also how did you go with the new 3D printed one?

  11. #11
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    Didn't try the smaller impeller, don't think it would have worked. No problems, happy to say, with the new one from America. Borrowed a long screwdriver from a friend and attached a magnet to magnetise it. Followed the instructions on YouTube which are great, stuck it all back together, and it works perfectly again. I even managed to get the 'difficult' screw back in place on my first attempt!
    I now now find, however, that I seem to be having impeller problems with my Smart Grinder Pro which surprised me, because it has steel tips on the impeller. Must go hunting for advice. Same problems as I had with the 800. Coffee banking up and the motor labouring. Must go now and do some research. I assume that Breville will supply an impeller for the Pro because it will drop straight into place. A coincidence that I had just fixed the 800 when the Pro began to fail.

  12. #12
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    Hi @Allen, I'm finding the same with my Smart Grinder Pro. I'm down to number 1 and adjusted to the finest setting. Did you find any useful information?

    Quote Originally Posted by Allen View Post
    Didn't try the smaller impeller, don't think it would have worked. No problems, happy to say, with the new one from America. Borrowed a long screwdriver from a friend and attached a magnet to magnetise it. Followed the instructions on YouTube which are great, stuck it all back together, and it works perfectly again. I even managed to get the 'difficult' screw back in place on my first attempt!
    I now now find, however, that I seem to be having impeller problems with my Smart Grinder Pro which surprised me, because it has steel tips on the impeller. Must go hunting for advice. Same problems as I had with the 800. Coffee banking up and the motor labouring. Must go now and do some research. I assume that Breville will supply an impeller for the Pro because it will drop straight into place. A coincidence that I had just fixed the 800 when the Pro began to fail.



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