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K3 Push Problem!

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  • K3 Push Problem!

    I purchased a K3 Push grinder approximately 5 months ago and it has been going great but last week when cleaning we noticed the threads have metal shavings on them (stripping?)
    The burrs seem fine though. I have cleaned the grinder many times with no problems until now
    Any ideas?



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  • #2
    Ok, so you have had the grinder for 5 months and you have " cleaned it many times "

    How many times is that? and have you taken it apart each time?
    A suck out with a vacuum every now and then is all that is really needed and maybe once every 6 months take it apart.

    From the pictures it looks to me like you have cleaned the thread too well in the past? removing the grease / lubricant that would have been put there in the factory, which if so needs to be re - lubricated.

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    • #3
      Probably would have cleaned it once a month 5-6 times I guess. Taken apart each time. Might try to re grease then.

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      • #4
        Unless you have the burr carrier threads seated fully and squarely before trying to tighten, I would imagine you could end up shaving the alloy grinder body threads. If the threads are too dry (no coffee oil residue) they could probably gall a bit also. I usually put a little food grade silicon grease on mine when reassembling and triple check that the threads are sitting correctly before trying to tighten. A light touch is required. A little food grade silicone grease goes a long way so use it sparingly.

        PS I also use a stiff toothbrush to clean out the threads of any grinds before wiping over and lubricating.

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        • #5
          Cool, is there a preferred brand of grease?

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          • #6
            Originally posted by andrew7777 View Post
            Cool, is there a preferred brand of grease?
            You just need to be sure its food grade grease I suppose. I picked up a tube from a speciality coffee store a while back. The box has "BioGrease Marlin-9 Food grade grease H1 (BGI-93HT)" on it. Originally it was to use on a grabby group head seal but I also use a little when reassembling the grinder.

            Food Grade Biodegradable Petroleum Grease Lubricant | Marlin Delfin Valas TaurQ - Products

            Understanding Food-Grade Lubricants

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            • #7
              Inox is a good brand of food grade grease Andrew, available from Jaycar Electrical, approx $8 a tube.

              A tube will last you forever.

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              • #8
                Great, Jaycar looks the easy option.
                I just went through the manual and I cant see where its says that the thread needs to lubricated at all? (i'm not very mechanical btw)
                To be honest I haven't really been impressed with the K3. Sure it does a great grind but there are plenty of flaws.

                (these are the most annoying, not including the thread problem)
                The chute always seems to trap approx 2 grams
                The little flap that beaks up the coffee as it enters the chute broke in less that one month.
                Too hard for my wife to unscrew and open to clean (says in the manual to clean once per week but that seems excessive so once a months is what we did)
                The paint is very poorly finished with various obvious flaws. Was the first thing I noticed when I received it actually.
                Gets clogged more often than other grinders I have had.

                Just thought I'd mention these points as everyone in the forum seems to love this grinder to bits.... except me.

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                • #9
                  Originally posted by andrew7777 View Post
                  Great, Jaycar looks the easy option.
                  I just went through the manual and I cant see where its says that the thread needs to lubricated at all? (i'm not very mechanical btw)
                  To be honest I haven't really been impressed with the K3. Sure it does a great grind but there are plenty of flaws.

                  (these are the most annoying, not including the thread problem)
                  The chute always seems to trap approx 2 grams
                  The little flap that beaks up the coffee as it enters the chute broke in less that one month.
                  Too hard for my wife to unscrew and open to clean (says in the manual to clean once per week but that seems excessive so once a months is what we did)
                  The paint is very poorly finished with various obvious flaws. Was the first thing I noticed when I received it actually.
                  Gets clogged more often than other grinders I have had.

                  Just thought I'd mention these points as everyone in the forum seems to love this grinder to bits.... except me.
                  Not denying your experience, but i think different grinders suit different people. For example my father wanted to have the same coffee that i make, he had no chance working the K3, however he has no problem working the breville SG.

                  I have weighed the little bit that gets stuck in the chute several times, 0.3 - 0.4g.

                  You could be having problems with more getting stuck because your flap is no longer functioning? How did it break, did you stick something up there pointy or sharp? Have you weighed the amount that gets stuck there?

                  The black paint on mine is beautiful and shiny.

                  When adjusting your grind lower do have the grinder running? I did not do this the first time i used it and it has been the only time it clogged. Turning the adjustment collar to the coarsest setting and running some beans through freed it up in no time.
                  Then as i already mentioned a bit of a suck with the vacuum and all is good.

                  I have done side by side with both grinders and i cant pick the difference in a milk drink, but for straight espresso / ristretto the K3 wins hands down.

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                  • #10
                    Andrew, I would go real easy on the grease, Have never used grease at all on either my Rocky or Mazzer Mini, grease will tend to attract any stray coffee grounds and make a heck of a mess.

                    My feeling is that given the machine is pretty new the (metal shavings) are in fact just a bit of swarf, left from when the thread was cut, your frequent unscrewing and replacing of the burr carrier has simply cleaned any left over swarf from the thread, it's not stripping, from your pics the thread looks fine to me.

                    As a matter of interest I give my grinder a thorough clean roughly every six months.

                    Re coffee grounds in chute, once again no big deal, the Mazzer does the same, I just give it quick brush with a small paint brush, gets rid of most of the debris.

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                    • #11
                      My preference is dry teflon lube over grease- obtainable from your local bike bloke.

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                      • #12
                        Took some more photos and noticed there is damage to the lower thread and the bits that sweep the coffee out Click image for larger version

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                        Is there supposed to be a cap above the nut (see pic)Click image for larger version

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                        Anyway will get some lubricant and see what happens.
                        Steve82 - Yep I have a good understanding of operation so maybe I just got a dud. Did weigh the input/output of coffee straight from a clean and yep was approx 2g retained. Found a video once that confirmed that, not a huge deal but annoying.

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                        • #13
                          Hmm- that damage- especially to the sweepers looks to me like something metallic has been through that grinder. The imperfections in the lower thread- neither here nor there as the entire thread locates the top burr carrier.

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                          • #14
                            Yes there are other marks that would indicate this as well. From photos on the net it looks like there should have been a cap on top of the nut? Could all the shavings be from that being ground?

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                            • #15
                              I can't honestly recall. I'll check on one of ours if I remember.

                              For one, a nut would make one helluva racket. You really couldn't miss it. Secondly, it would be too big to fit between the burrs.

                              My diagnosis, more likely a screw/nail etc which has found its way into a batch of beans.

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