Section 6: The Coffee System 3033-006B
6-16 Concordia Xpress Technical Support Manual
2900-300B
Installing the Gearbox
1. Insert the gearbox through the grounds bin area until it sits under
the brew group assembly. A new/replacement gearbox comes
with a new left spindle.
NOTE: Ensure all wires and connectors from the Hall-Effect
sensors and motors are clear and go to the back of the machine.
2. Go to the back of the machine and insert the free red and black
wires from one of the motors into the shared group power plug.
NOTE: The proper pattern of wires is black, red, black, red; as
viewed from the rear of the machine. There is a reference mark
on the connector for pin #1 (1=black, red, etc).
3. Plug in the group motor power plug and rotational Hall-Effect
sensors plugs to the assigned plugs.
4. Hold the gearbox under the spindles.
5. Navigate to TEST ROUTINES > RIGHT DRIVE and press the
down arrow until the right spindle starts to feed into the gearbox.
NOTE: Make sure the right positional Hall-Effect sensor plate
has been properly placed.
6. Press the down arrow until the gearbox is drawn up to the brass
spacers.
7. Re-check right positional Hall-Effect sensor plate location.
8. Insert the four gearbox mounting bolts up through the gearbox
and finger-tighten.
9. Lower the right piston slightly and tighten the four mounting
bolts.
10. Re-install the lower piston into the brew chamber and secure it to
the spindle shaft, using a screw.
11. Run a brew group initialization to reset.
12. Re-install the grounds chute.
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