Model GPX Precision Disc Style Coffee Grinder Model GPX Precision Disc Style Coffee Grinder Modern Process Equipment, Inc. Chicago, Illinois Rev. 10/01/02 Model GPX Precision Disc Style Coffee Grinder OVERVIEW The Model GPX Disc Style Coffee Grinder utilizes precision cut "diamond hard" grinding plates to produce up to 400 lbs 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. Rev. 10/01/02 Model GPX Precision Disc Style Coffee Grinder 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. NOTE TO REMOVE ANY COFFEE BUILDUP ABOVE DECHAFFING GATE, SWING THE DECHAFFING ARM UPWARD UNTIL IT IMPACTS ON THE “KNOCKER”, AS SHOWN IN THE DRAWING BELOW. DO NOT PUSH OR FORCE HANDLE DOWN DECHAFFING GATE DECHAFFING ARM DECHAFFING GATE DECHAFFING ARM KNOCKER KNOCKER NORMAL OPERATING POSITION CLEANING POSITION 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. CAUTION! LOCK OUT OR DISCONNECT MOTOR PRIOR TO ATTEMPTING WORK, REPAIR OR REMOVAL OF COVER FROM THIS UNIT. Rev. 10/01/02 Model GPX Precision Disc Style Coffee Grinder 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. NOTE PRIOR TO OPERATING THIS UNIT, ASCERTAIN THAT THE (3 PHASE) DRIVE MOTOR IS OPERATING IN A CLOCKWISE DIRECTION (FROM THE MOTOR SHAFT END). Rev. 10/01/02 Model GPX Precision Disc Style Coffee Grinder Drawings GPX Store Grinder on Stand GPX-B Store Grinder Bench Model Model GPX Disc Style Grinder Parts List 5-10 HP, Starter/Wiring for GP-140/GPX Grinder Single Phase 230V Diagram, GPX 3 HP. Starter Three Phase Full Voltage, GPX 3 HP. Starter Model GPX Disc Style Coffee Grinder With Parts List Rev. 10/01/02 SG-1204B SG-1205B SG-1206B EL-1520D EL-1521B EL-1522B SG-2520C Model GPX Precision Disc Style Coffee Grinder Rev. 10/01/02 Model GPX Precision Disc Style Coffee Grinder Rev. 10/01/02 Model GPX Precision Disc Style Coffee Grinder Rev. 10/01/02 Model GPX Precision Disc Style Coffee Grinder Rev. 10/01/02 Model GPX Precision Disc Style Coffee Grinder Rev. 10/01/02 Model GPX Precision Disc Style Coffee Grinder Rev. 10/01/02 Model GPX Precision Disc Style Coffee Grinder Rev. 10/01/02 Model GPX Precision Disc Style Coffee Grinder Rev. 10/01/02 Model GPX Precision Disc Style Coffee Grinder Burr Installations When installing reconditioned burrs add one shim to back of each burr. Rotating Burr Stationary Burr When installing new or reconditioned burrs make sure the mounting surfaces are clean If rotor is stuck on the motor shaft, insert two threaded rods to break the rotor loose. Zero Adjust Procedure GRINDER SETTINGS DECAL ACTIVE GRIND RANGE CO SE AR 3 4 5 6 7 FI NE 10 1 9 2 8 ADJUSTING KNOB ADJUSTING SCREW LOCKING SCREWS Rev. 10/01/02 1. After fully assembling grinder, turn grinder on. 2. Loosen locking screws 3. Rotate the knob to grind setting No. 10. 4. With a screwdriver turn adjusting screw clockwise until burrs touch lightly. 5. Tighten locking screws. 6. For GPX grinders turn knob counterclockwise to grind setting No. 8, For GPC grinders turn knob counterclockwise to grind setting No. 9. 7. With a screw driver hold the position of the adjusting screw, then loosen the locking screws. 8. While still holding the position of the adjusting screw, turn the knob to grind setting No. 10. 9. Tighten locking screw. 10. The grinder is now adjusted to the original factory settings.