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.


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. Because the tolerance between the rotor insert and shaft is very tight, over time the shaft’s end may wear and create high points. 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 Hardly Any Coffee Is Coming Through the Grinder and Is Very InconsistentYour 3 phase motor is wired in reverse. Switch any of the two terminals (not the ground though).
Coffee Is Shooting Out of the Grinder Spout Unusually FastCheck your dechaffing gate. Is it broken or bent?
My Grind Setting Is Changing During GrindingIs you locking nut missing? Sometimes it falls off and customers forget it exists to lock the dial in place during grinding.

Manuals for GPX models