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4 CHANGING TAMPER BASE
4.1 Upper clamp types
The type of upper clamp can be determined by measuring the diameter of the U-
shaped groove in the upper clamp, as is shown in figure below.
There are two types of upper clamps: 66 and 71mm. The size 71mm or 66mm is the
diameter (mm) of the U-groove, as is shown in figure 4.1 by the red arrow.
Why are we using two types of upper clamps? If the U-groove is too big compared to
the outer diameter of the filter basket, level tamping cannot be guaranteed.
4.2 Determine upper clamp type
The type of upper clamp is defined by the external diameter of the filter basket. In
order to determine the correct upper clamp type, measure the outer diameter of the
filter basket using a calliper.
Choose the correct upper clamp type using table below:
Filter basket
outer diameter
[mm]
< 66,5
>66,5
Clamp type
66
71
