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 that is allowed by the circuit breaker inside the power box. For reference, on a 220 V non-WCI model, this limit is 16 A.
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. Swap any two of the three wire leads (typically on the NEMA plug, if that’s installed). Do not swap the ground wire though (typically green). This will reverse the direction of your 3 phase motor. However, this will not work for single phase motors. If you have a single phase motor, the motor will always run in the correct direction.
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 your locking nut missing? Sometimes it falls off and customers may forget it exists to lock the dial in place during grinding.

Manuals for GPX models