I clean and oil my machine regularly for best performance, but I had trouble to find out from the photo in the manual as to where exactly my Bernina Aurora 440 QE needs to be oiled. So I went back to the shop from where I bought my Bernina and they were so kind to indicate how to clean and to oil the machine correctly. So here it goes:
- Turn the machine off and unplug it
- Unthread the machine and remove the bobbin case. To remove the top thread, cut the thread somewhere between the tension disks and the spool, raise the presser foot and then pull the thread through the machine. Pulling the thread backward through the tension disks is not recommended.
- Remove the presser foot and the needle
- Remove the stitch plate by pressing the stitch plate down at the back right corner (where the circles are), lift it and remove it
- Clean the area with a lint brush and take good care to remove all threads and lint that might have got caught under the feed dogs as well
- Once you have removed the lint, replace the stitch plate
- To clean the hook area, open the cover if it is not open yet and push the release lever to the left
- Let down the black hook race cover
- Remove the hook
- Clean the hook and the hook race from lint with a lint brush
- Replace the hook (you might have to turn your handwheel so that the hook driver is on the left)
- Close the hook race cover, making sure that the locking pin is engaged
- Check by turning the handwheel
- After cleaning the bobbin area, squeeze one drop of oil into the hook race. You can also apply a drop of oil on the outer border of your hook before inserting it. Where metal moves against metal, you should oil.
- I let my machine run for a few stitches to distribute the oil in the hook area and to prevent the oil soiling the fabric.
That’s it. It is not as difficult as it sounds.
The Bernina will display a little oil can on the display when it needs to be cleaned and oiled (after 180,000 stitches approximately), but I have the habit to clean and oil my machine more frequently than that. After every project or a long day of sewing, I remove the lint and check for caught up threads and I usually also apply a drop of oil to the hook race. To clear the notification in your display, you need to to press the hash button (#) twice. The display can also be cleared temporarily by pressing the “clr” button. Once you restart your sewing machine, the notification with be displayed again. If you have cleared the notification with the “clr” button three times, the notification will only appear again after a further approximate 180,000 stitches.
The display of the Bernina Aurora 440 QE will show a service notification after approximately 2,000,000 stitches. It’s a little icon of two crossed tools. You should bring your machine to your Bernina technician for a check up, servicing and re-adjusting. The technician will reset the stitch count to “0″ again. The service notification can be cleared temporarily the same way as the cleaning notification described above, by pressing the “clr” button. After clearing the notification for the third time it will only re-appear after a further 2,000,000 stitches approximately.