77
2016/01 Rev. 0.0
OptiFresh (Bean) NG 2.0
EN
6.6 Maintenance freshbrew group
6.6.1
Replacing the Brewer Cylinder
and Teflon Seal
The Zuma brewer creates a vacuum that pulls hot water
through the coffee grounds and the filter screen, and
into the brewer cylinder. The brewer pauses prior to
dispensing the brewed coffee to allow this vacuum to
pull all of the liquid into the cylinder.
After several thousand cycles, the brewer cylinder
and/or the Teflon seal will become worn and scored.
When this scoring gets severe, air will enter the brewer
cylinder from between the Teflon seal and the cylinder
wall, resulting in a loss of vacuum. In many cases, you
will actually be able to see these air bubbles during the
brew cycle. When a vacuum loss occurs, the brewer
cylinder and Teflon seal will both need to be replaced.
Required parts:
- 4x
O-ring
art.no. 03368
- 1x
Teflon seal
art.no. 03370
- 1x
Brewer cylinder
art.no. 03372
- 4x
toothpicks
Preparations:
1. Remove the brewer from the machine, and then
remove the filter screen and the brew chamber from
the brewer.
2. Remove the c-clip at the rear of the crank arm, and
then remove the crank arm pin.
3. Remove the four screws that secure the brewer
cylinder to the brewer mainframe.
4. Pull down the piston to remove this assembly from
the brewer cylinder. At this point, the old brewer
cylinder can be discarded (but not the piston
assembly).
5. Remove the four screws at the top of the piston
assembly. Remove the stainless steel top plate
from the assembly.
6. Remove the old Teflon seal. It may be necessary to
twist the seal or rock it back and forth until it clears
the large rubber piston ring. Once removed, discard
the old Teflon seal.
