Replacing The Brewer Cylinder And Teflon Seal; Removing The Brewer Cylinder And Piston - VKI Technologies Zuma Brewer Operation And Service Manual

Zuma Brewer - Operation & Service Guide

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.

Removing the Brewer Cylinder and Piston

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 (
frees the piston rod from the crank arm.
3. Remove the four screws and washers (two on each side) that secure the brewer cylinder to the
brewer mainframe. The screws go through the brewer mainframe and fasten to a metal cylinder plate,
which will fall out from the mainframe when the screws are removed.
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), and then remove the crank arm pin (
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). This
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