7. Manual Fill Switch
Depressing this switch activates the auto-fill valve, allowing cold water to flow into the
steam boiler. This switch would only be used if the fuse in the control box has blown.
9. Main Switch
The main power switch has three positions: OFF, FILL and RUN (or 0,1,2 on older ma-
chines.)
Off - The machine is off
Fill - The electonics are activated, but NOT the heating elements. This allows the machine
to auto-fill prior to the elements heating up.
Run - The electronics as well as the heating elements are activated allowing the machine to
build steam pressure and the coffee boiler to heat up.
10. Portafilter
The portafilter holds the ground coffee dosed from the grinder. The portafilter, dosed and
tamped with coffee is then inserted into the group head to brew espresso.
11. Group Head
The group head is where the brewing water meets with the ground coffee in the portafilter
to brew espresso.
The La Marzocco’s group head is called a saturated group. It is either a nickle-plated brass
group, (machines manufactured prior to March 2003) or a stainless steel group, (machines
manufactured from March 2003 to the present).
Group is welded
to the boiler*
Bleed Screw
Thermal Limiter
Group Cap
O-ring
Banjo Bolt
Fiber Gasket
Banjo Tube
Group Head
O-ring
Diffuser Block
Portafilter Gasket
Bayonet Clamp Ring
Diffuser Screen
Diffuser Screw
Group to Boiler
Gasket*
Exit port to Flow-
meter
Brass Group
Group is welded
to the boiler*
The banjo tube has been
redesigned, the banjo bolt is
no longer required.*
Stainless Group
Stainless Group
