Manual Quick mill QM67 Dual Boiler (page 16 of 24) (English)

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QM67 Dual Boiler Espresso Machine

Owner’s Manual Page 15

Maintenance – Continued

Setting Pump (Brew) Pressure

• To set the pump pressure, install the backflush

disc into your portafilter and then lock it into the

group head.

• Remove the top cup warming tray to expose the

expansion valve adjustment screw shown on the

picture to the right.

• Raise the brew lever and then wait a few seconds

for the pressure to rise. After the pressure has

risen, use a flat blade screwdriver to turn the

expansion valve adjustment screw. Turning clockwise will increase the pressure, counter

clockwise to decrease the pressure.

• The recommended setting with the backflush disc is 9.5 - 10bar. When you make

espresso the pressure will be slightly less due to less resistance.

• If the machine is able to put out 9.5-10bars of pressure with the backflush disc, but when

you make espresso the pressure is 8 bars or less then that means the grind needs to be

adjusted finer which will create more resistance to raise the pressure. It is normal for the

grinder to drift a little over time and using different coffees or depending on the freshness

of the coffee may require a minor grind adjustment to stay in the preferred brew range.

• Tamping pressure can also affect brew pressure so be sure to tamp with the same 30lbs

of pressure each time. Tamping too lightly will cause the pressure to be low and the shot

will come out quicker. Tamping too hard and the pressure will be higher and the shot may

come out too slow or not at all.

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Quick mill QM67 Dual Boiler Manual

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