Worn brew drive gear makes noise?
During rinse and also immediately after coffee flow stops there is an unusual noise that sounds a bit like a slipping gear or a loose part knocking. Any idea what could be causing this and might it be user fixable?
that sound is from the electric-magnet at the drainage-valve.
When the brewing stops, the fluidsystem would rinse through the nozzle
in the front and it would give many drops of coffee.
So this problem is solved by the drainage-valve, which lets the water out and air in
to stop the tripping.
The electric magnet knocks a steel-needle at a plastic cap which is mounted to
a metal axle in the valve which then opens.
Sometimes these Juras make awful humming noises while the electric-magnet
has current, too. - when these Juras get older.
As long as the knock sound and the humming is only hearable while the drainage-valve has
opened evverything is okay. :)
Friendly greets and good luck. :)
Ah, yes, solenoid is the word for "electric magnet", thank you.
Look at that video, it shows a damaged brewgroup,
but you can see the action of the valve:
At 0,18 the solenoid gets current and opens the valve by pushing the metal axle. For that duration a humming noise is hearable, listen good.
At 0,23 the noise ends in the moment the valve snaps back.
If you hear fot those 5 seconds a knocking sound it is very shure that there is a problem with that solenoid, the valve or electronics.
I hope you understand me, sorry. :)
The brew group needs to be repaired by replacing the seals and cleaning it. Kits and instructions are available.