MPE GPX User manual
Rev. Sept 20201
Model GPX Precision Disc Style Coffee Grinder
Model GPX
Precision Disc Style Coffee Grinder
Modern Process Equipment, Inc.
Chicago, Illinois
OVERVIEW
Rev. Sept 2021
Model GPX Precision Disc Style Coffee Grinder
The Model GPX Disc Style Coffee Grinder utilizes precision cut "diamond
hard" grinding plates to produce up to 400 lb per hour of a full range of coffee
grinds. The grinder utilizes a 3 HP (1800 RPM) motor to drive a rotor, which
incorporates an auger feeder and a rotating grinding disc. The rotor also
incorporates turbo vanes to maximize throughput and minimize product
accumulation within the unit.
The gap between the rotating grinding disc and a stationary grinding disc,
which is mounted directly opposite on the grinder housing, determines the type of
coffee grind produced. The machine’s grind adjustment knob utilizes a screw
assembly and thrust bearing to vary the position of the rotor on the motor shaft
and, consequently, adjust the gap between the grinding discs. This disc gap
variance provides the capability of "dialing in" any one of a full range of coffee
grinds, from drip to espresso.
On "American" style coffees, it may be necessary to utilize the dechaffer
on your GPX grinder. By utilizing the weight on the dechaffing arm, back
pressure is exerted on the coffee being expelled from the grinder, thereby
breaking up the "chaff" (broken coffee skin) which is released when the bean is
ground. By moving the weight outward on the dechaffing arm, the back pressure
and the resulting level of dechaffing is increased. When producing very fine
coffees (melitta, espresso, turkish), the dechaffing level should be minimized or,
in some cases, eliminated by removing the weight.
OPERATION AND MAINTENANCE
Because of its uncomplicated design, the GPX grinder is relatively simple to
operate. Prior to starting the grinder, ensure that the coffee bean control gate is
fully closed. To grind coffee, simply start the grinder, fill the hopper with the desired
amount of beans, set the dechaffer arm weight, "dial in" the desired grind on the
grind adjustment knob, and open the bean control gate. As a starting point, the
dechaffer arm weight should be set at 1/2 the arm distance for medium to coarse
grinds, and at the bottom of the arm (fully toward the machine) for finer grinds.
When the grinding run is complete, close the control gate, lift the dechaffer arm to
remove any excess coffee, and shut down the grinder.
To change the grind range on the grind adjustment knob, loosen the knob set
screws, rotate the adjusting screw in the middle of the knob (Clockwise=Finer) to
the desired point, and retighten the knob set screws.
Rev. Sept 2021
Model GPX Precision Disc Style Coffee Grinder
Don't push down on the dechaffing
arm as this may damage the
dechaffing gate.
Do lift up the dechaffing arm and
lower the coffee bag at the end of
grinding. This empties the burr
housing.
Rev. Sept 2021
Model GPX Precision Disc Style Coffee Grinder
Video on how to use and
not use a dechaffing gate.
How to install a dechaffing gate
and add a dechaffing arm.
MPE webpage for troubleshooting
common GPX issues.
Rev. Sept 2021
Model GPX Precision Disc Style Coffee Grinder
PRIOR TO OPERATING THIS UNIT, ASCERTAIN THAT THE (3 PHASE)
DRIVE MOTOR IS OPERATING IN A CLOCKWISE DIRECTION (FROM THE
MOTOR SHAFT END).
Drawings
GPX Store Grinder on Stand SG-1204B
GPX-B Store Grinder Bench Model SG-1205B
Model GPX Disc Style Grinder Parts List SG-1206B
5-10 HP, Starter/Wiring for GP-140/GPX Grinder EL-1520D
Single Phase 230V Diagram, GPX 3 HP. Starter EL-1521B
Three Phase Full Voltage, GPX 3 HP. Starter EL-1522B
Model GPX Disc Style Coffee Grinder With Parts List SG-2520C
NOTE
CAUTION!
LOCK OUT OR DISCONNECT MOTOR PRIOR TO ATTEMPTING WORK,
REPAIR OR REMOVAL OF COVER FROM THIS UNIT.
On occasion, the grinder will require disassembly for cleaning and/or grinding disc
replacement. To disassemble, remove the front cover after first removing the (3)
front cover screw knobs. After the front cover has been removed, the rotor can be
pulled out either by hand or by utilizing "ejector screws" on the rotor insert (part #4
on drawing SG-1206-B) which, when screwed in, act against the motor shaft to
force the rotor out. Refer to drawing SG-1206-B for further details on the internal
construction of the grinder.
Rev. Sept 2021
Model GPX Precision Disc Style Coffee Grinder
Rev. Sept 2021
Model GPX Precision Disc Style Coffee Grinder
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Rev.
Sept
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