DITTING KE640 ES Mode D'emploi page 18

K E 6 4 0 E S | K E 6 4 0 V A R I O
9.1.11. Replace the hopper in the bayonet, fasten the safety screw
and open the hopper slider.
9.2 Grinding disc exchange
The grinding discs should be exchanged if any of the following
symptoms emerge:
• loss of grind capacity (>5sec for a double shot of espresso of
15g)
• significant heating of the ground coffee
• uneven particle size distribution
• change of the sound of the grinder (due to the change from
cutting to grating).
Grinding disc replacement should only be carried out by autho-
rised specialists or a customer service centre. "Repair manual
KE640 grinding disc replacement and basic adjustment", article
No. 306592, is recommended for replacing grinding discs.
Grinding disc replacement may also be carried out using
a replacement built-in grinder. To do this, order a built-in
grinder. On receipt of the built-in grinder, remove
your grinder from the KE640 ES / KE640 Vario according to chap-
ter 9.1
and install the new built-ingrinder into your KE640.
Return your old built-in grinder in the packaging.
9.3 Recalibration of the grind adjustment
Due to wear and tear fo the grinding discs or after exchanging
them the Zero-grind-adjustment has to be recalibrated.
• Turn the grind adjustment to the finest setting "0".
• Close and remove the hopper.
• Remove the remaining beans from the filler shaft and vacuum
out the grinder casing.
• Remove the silicone sealing ring from the filler shaft.
• Loosen – do not unscrew – the adjusting screws with the in-
cluded Allen key (size 2.5, article No. 305015 - also available in
service-kit).
• Insert the adjusting handle (service-pack) into the filler shaft.
The adjusting handle must engage in the slot in the filler
shaft's transverse biar.
• Start the grinder.
• Whilst the grinder is running, turn tihe adjusting handle clock-
wise until a slight ringing sound becomes audible. Now turn
the adjusting handle back anti-clockwise until no further rin-
ging sound can be heard.
It is important to ensure that no grinding disk
"rattling" can be heard at the finest setting!
Otherwise the service life of the discs will be
significantly reduced!
• Tighten the adjusting screws and remove the adjusting handle
from the filler shaft.
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