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Lubricating Bezzera E61 Cam.

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  • #31
    Ok pulled apart again. Pins have same surface approach angles on all 4 sides. Some even minor wear on pin surfaces and cam. Relubed and back together. Short of chroming cam this might be the new normal...(although smooth now because of lube)

    Cheers

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    • #32
      It is a little strange though Oz...

      Admittedly, the first use after a detergent backflush can be a bit rough but I found that after the first shot, there was enough coffee oil remaining behind that future usage was very smooth - That was with the hard faced cam, although it was similar before I did this.

      Mal.

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      • #33
        How tight are you doing up the nut on the end of the cam shaft? That nut can be over tightened so maybe try loosening it up a little. Also, did you lube up between the cam lobe and where the shaft pokes thru?

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        • #34
          Originally posted by JMcCee View Post
          How tight are you doing up the nut on the end of the cam shaft? That nut can be over tightened so maybe try loosening it up a little. Also, did you lube up between the cam lobe and where the shaft pokes thru?
          Sure did Jim. Will loosen the lever screw but didn't tighten tight, just nipped up to same feel as factory setting when I undid it.

          Cheers

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          • #35
            Originally posted by Dimal View Post
            It is a little strange though Oz...

            Admittedly, the first use after a detergent backflush can be a bit rough but I found that after the first shot, there was enough coffee oil remaining behind that future usage was very smooth - That was with the hard faced cam, although it was similar before I did this.

            Mal.
            Yep it's odd Mal. I will try doing again what Di Bartoli suggested which was 3 back to back doubles with no water flush in between.

            Cheers

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            • #36
              The whole length of the "cam shaft" needs to be lubricated now and again, over time it will dry out and this results in squeaking.

              Remove it completely from the body, wipe the shaft and bush clean then lubricate (don't forget a dab of grease on the nub that the shaft pivots on in the group head body) and reassemble.

              There are a couple of grooves cut in the shaft, seems their purpose is to retain some lube, but as I said they do dry out, once you do this the mechanism should operate smoothly again.

              FWIW over 10 years I've only had to replace the pins/seals once and then only because the rubber seals gave up the ghost, pin wear was negligible.

              As a matter of interest lubing the cam through the top works fine, lift the lever to rotate the cam to distribute the grease whilst doing the job, gravity and migration ensure that the cam is coated with lubricant.
              I lube the cam perhaps once every 6 months or so, the shaft? when it needs it.
              Last edited by Yelta; 24 April 2019, 11:50 AM. Reason: Repetition

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              • #37
                As an addendum to my last post.

                Don't over do the chemical back flushing, it will strip the lube out pretty quickly.

                I use my machine twice daily, two shots AM 1 x PM

                I water back flush after each use, chemical back flush weekly, keeps things spotless.

                Before I chemical back flush I remove the shower screen and seal and wash them, then reinstall and do the back flush.

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                • #38
                  Going to have to pull it down again. It's just not performing smoothly. Will lube everything in sight...

                  Cheers

                  Comment


                  • #39
                    How often are you undertaking a detergent Backflush mate and how much do you use each time?

                    Mal.

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                    • #40
                      Hi Mal. I've only done it once since buying the machine and 1/4 teaspoon. It got sticky straight after that and lubricating with Inox food grade grease only works for a few days. I even stopped backflushing with water to see if that helped lube with the coffee oils but still keeps going back to that feel that isn't brass on brass sympathy.

                      Cheers

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                      • #41
                        Hmmm...

                        I'd contact your Vendor Oz, shouldn't be happening like that.
                        Maybe the Cam, one or both of the Valve Stems has a blemish that leads to this occurring.
                        Are you able to examine the interfacing surfaces under magnification, might be able identify something that shouldn't be there?

                        Sorry I can't offer more help mate...

                        Mal.

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                        • #42
                          Thanks Mal. I will get onto Di Bartoli. Cheers

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                          • #43
                            Originally posted by ozscott View Post
                            It got sticky straight after that and lubricating with Inox food grade grease only works for a few days.
                            Dow Corning Molykote 111 is recommended by some in the trade as the way to go. JetBlack Espresso sell it. The tube will last you a very long time. Seems to keep things running smoothly for longer than others I've tried. Cotton buds make application easy. Make sure everything is dry before applying.

                            https://www.jetblackespresso.com.au/...111-100g-tube/

                            https://www.home-barista.com/tips/lu...ns-t47391.html
                            Last edited by CafeLotta; 27 April 2019, 07:38 PM.

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                            • #44
                              Originally posted by ozscott View Post
                              Going to have to pull it down again. It's just not performing smoothly. Will lube everything in sight...

                              Cheers
                              Morning Ozscott, the only points in the lever assy of the Bezzera that can dry out and cause this problem are the cam and the shaft, have you done as I suggested in post 36 , removed and lubed the shaft? whilst your at it check for rough edges or irregularities in the assy including the face of the cam as well as the bearing surface of the pins, the shaft and the bush that houses the shaft, its quite a simple process and unless there is in fact a manufacturing fault lubrication should remedy the issue.

                              Reassembly can be a little tricky, I've found you need to locate the cam in the closed position then using the handle rotate it into the open position before sliding the bush assembly into place, a bit fiddly, dont force anything, I'm sure you will work it out

                              As Cafelotta suggests Molykote is an excellent lube however if Inox doesn't solve the problem I very much doubt any other lube will provide a magic fix.

                              As Mal has suggested if none of this works perhaps contact with the retailer is the way to go.

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                              • #45
                                Ok she is back together and smooth so we will see how she fares.

                                Cheers

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