N&W Global Vending Koro Prime Espresso Installation, Operation & Maintenance Manual - page 51
© by N&W GLOBAL VENDING S.p.A.
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01-2016 4875 00
BREW UNIT MAINTENANCE
The brew unit must be serviced, even if slightly, every
10,000 dispensing cycles or, any way, every 6 months.
To provide for maintenance, remove the unit and act as
follows:
- unscrew the brass ring nut and detach the teflon tube
for boiler connection from the upper piston while paying
attention not to lose the gasket.
- unscrew the knob fastening the unit to the shelf;
- extract the brew unit.
Upper filter disassembly
-Extract the upper filter snap ring from the seat;
-Extract the piston from the crosspiece.
-Disassemble the filter and the gasket from the piston.
Lower filter disassembly
-Extract the snap rings from the connecting rods and
remove the connecting rods;
-Extract the snap rings from the deviating slides and
remove the slides;
-Unscrew the screw from the outer disk
-Unscrew and remove the screws intended to fasten the
two half-shells
-Remove the coffee funnel;
-Remove the internal brewing chamber
-Extract the snap ring intended to fasten the lower
piston:
-Extract the piston from the brewing chamber and disas-
semble the filter.
Dip the components you have disassembled into a sani-
tising solution for 20 minutes. Replace the components if
damaged and/or broken.
Rinse abundantly, dry everything and reassemble in the
reverse order.
Important!!!
Arrange the upper piston into the grooves corre-
sponding to the released dose
Check the efficiency of gaskets. Lubricate them by
using grease for foodstuff.
Fig. 26
1- Tube
2- Ring nut
3- Upper piston snap ring
4- Connecting rod snap ring
5- Coffee funnel (not available in the models with volumetric doser)
6- Connecting rod
7- Deviating slide
8- Fastening knob
9- Lower piston snap ring
10- External disk
11- Half-shells