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Chicago, IL 60623 U.S.A.
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GPX Support

The GPX and the GPX.WCI are two of the most widely used grinders MPE makes. Because of their popularity, it is not uncommon for customers to seek support for many of the same issues over the lifetime of grinder ownership.

These videos provide expert help for common GPX support issues.

Cleaning the GPX


How to clean the GPX.

Replacing Burrs


How to replace the GPX burrs.

Calibration


Watch how to properly and easily calibrate your GPX.

Dechaffing Gate


What is it and what does it do?

Common Issues


Grinder Shuts Off Randomly


Make sure the right voltage is getting to your grinder. If the voltage is too low, the motor draws more amps and can trip the electrical box.

The Rotor Isn't Coming Off the Shaft


There are two screws you can put inside the center rotor insert (the name of the part) to safely dislodge the rotor from the shaft. Stuck rotors appear to be more common with single phase grinders. Because the tolerance between the rotor insert and shaft is very tight, over time the shaft's end appears to bend slightly. Use a file to level out the shaft's edges until the rotor can fit and release easily from the shaft.

The Grinder Is On, but Coffee Isn't Getting Ground


Your 3 phase motor is wired in reverse. Switch any of the two terminals (not the ground though).

Manuals for GPX models