Grindmaster 835 User Manual

800 Series Coffee Grinders

Operator Manual

Models 810, 835, 875, 890

GMCW

4003 Collins Lane, Louisville, KY 40245 USA
Phone: [phone] Toll Free: 800.695.4500
Fax: [phone]
Web: gmcw.com Email: [e-mail]

Model 810

Model 875

Specifications...........................2

Safety Information..................3

Installation...............................3

Operation ................................4

Cleaning & Maintenance........5

Troubleshooting Guide...........6

Parts Diagram and List ...........7

Wiring Diagram.....................10

Thank you for purchasing this quality coffee grinder. For your safety and the safety of others, read all
warnings and the operator’s manual before installing or using the product. Properly instruct all operators.
Keep training records. For future reference, record serial number here:

Table of Contents

Model 835

©1995 GMCW

Printed in USA

0615 Form # GR-380-18

Part # 83427

Model 890

GMCW provides the industry’s BEST
warranty. Visit gmcw.com for warranty
terms and conditions.

2 Grindmaster

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800 Series Coffee Grinders

Specifications

Model Description Electrical

810S

Medium duty grinder - 1.5 lbs hopper.

C-UL US, ETL Sanitation Certification

120V / 920 W / 8A / 1 Ph

835S

Medium duty grinder - 1.5 lbs hopper.

C-UL US, ETL Sanitation Certification

120V / 920 W / 8A / 1 Ph

875S

Medium duty grinder - 3 lbs hopper.
C-UL US, ETL Sanitation Certification

120V / 920 W / 8A / 1 Ph

890BS

Medium duty grinder with European slicing burrs

- 3 lbs. hopper.

C-UL US, ETL Sanitation Certification

120V / 920 W / 8A / 1 Ph

890T

Medium duty grinder with European slicing burrs

- 5 lbs. hopper.

C-UL US, ETL Sanitation Certification

120V / 920 W / 8A / 1 Ph

800 Series Coffee Grinders Grindmaster

®

3

Safety Information

Important Safety Information

This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety messages
that follow this symbol to avoid possible injury or death.

WARNING

•Product must be attached to a three wire 120V 15 AMP receptacle (export units - 230V 16 AMP).

•Do not deform plug or cord.

•Follow national and local electrical codes.

•Do not use near combustibles.

•Use only on a circuit load that is properly protected and capable of the rated load.

•Always unplug unit from power supply before servicing or cleaning.

FAILURE TO COMPLY RISKS PERSONAL INJURY, SHOCK HAZARD, FIRE, OR DAMAGE TO EQUIPMENT.

CAUTION

Personal injury hazard. Keep fingers, hands, and foreign objects out of hopper or chute opening.
Model 890T must be bolted to the counter to prevent possible bodily injury from overturning.

NOTICE

Never connect to an overloaded circuit or to an extension cord, otherwise serious damage to the motor may
result.

CAUTION: Risk of bodily injury due to tipping.

Use care when installing Model 890T.

NOTICE: It is essential that full voltage and amperage

always be available as it takes full power to grind
coffee.

Please read this manual before operating the grinder.

1. Carefully remove grinder from carton.

2. Place grinder in position on shelf, counter
or other flat surface.

3. (Model 890T only). Using (4) provided 5/16”­18 x 1 1/2” bolts, washers, and nuts, attach
grinder securely to counter.

4. Plug grinder into the specified power
source. (Check rating plate on back of unit
for voltage and amperage requirements.)
Do not use an extension cord.

5. Fill hopper with whole bean coffee.

6. Grind a small amount of whole bean coffee

following operating instructions as
described in this manual

7. If there is any problem, consult the
Troubleshooting Guide in this manual, (also
on back of grinder.)

If you need help, call GMCW Technical Service
Department for help, [phone] or [phone]
(USA & Canada only) 8 AM - 6 PM EST.

Prior authorization must be obtained from GMCW for
all warranty claims.

Installation

For your safety and the safety of others, read all warnings and the operator’s manual before installing or using
the product.

DANGER: This term warns the user of imminent hazard that will result in serious injury or death.
WARNING: This term refers to a potential hazard or unsafe practice, which could result in serious injury or

death.

CAUTION: This term refers to a potential hazard or unsafe practice, which could result in minor or moderate

injury.

NOTICE: This term refers to information that needs special attention or must be fully understood.

Your new coffee grinder is easy to operate and
maintain. Before you place it in service, please have all
personnel familiarize themselves with these
instructions. Keep this manual in a convenient place for
ready reference.

How to Operate

1. Turn the selector knob to the desired grind
setting.

2. Fill the hopper with the desired type and
amount of whole bean coffee. Close the
lid.

3. Place the bag underneath the spout.

4. Press the start button. *810 model - Press
the grinder switch to the ON position.

5. The grinder will automatically stop when
the bag is removed.**

* 810 model - Once coffee is ground, press
the grinder switch to the off position or
grinder will continuously run.

** On models 835 and 875 the stop button
may be pressed after the grinder has
completed grinding.

6. Remove bag from coffee spout once coffee
is ground.

Grinds

Before shipment, this grinder has been tested with
coffee and has been accurately adjusted to deliver
ground coffee to normal auto drip specifications.

The Grinding Burrs are made of an extremely hard and
wear resistant material. From time to time, grind
adjustments (see following instructions) may be
necessary. If the grind runs coarser than expected after
normal adjustment and the grind time has increased,
the burrs may have excess wear and should be
replaced. New burrs should always be installed as a
pair, never one or the other, as they are accurately
ground and lapped in pairs. Old burrs cannot be
resharpened.

Grind Adjustment

Tools required: Phillips screwdriver

Large blade screwdriver
Pliers

1. Remove all coffee from the hopper.

2. Set selector knob to the finest setting
(Espresso or Turkish) depending on the
model.

3. Loosen both knob retainer screws in
selector knob one turn only.

4. While pressing the bag switch, located
behind the spout, press the start button so
that the grinder will run during

adjustment.
*810 model - Press the on or start button
so that the grinder will run during

adjustment.

5. With the grinder still running, turn the
adjusting screw in the center of the selector
knob slowly to the right until a slight
chirping noise is heard. Immediately turn
the adjusting screw to the left until
chirping noise stops. This is the finest grind
obtainable.

6. Tighten both of the knob retainer screws.
Once the finest grind has been set, the
other grind settings will automatically set
correctly.

7. Press the stop or off button.

NOTICE: Always be sure the grinding burrs are not

touching while the machine is running on the
ESPRESSO/TURKISH setting. Otherwise serious damage
to the motor may result.

Protection

This grinder is equipped with both a circuit breaker and
a shear disc or shear pin to protect motor and burrs.

Circuit Breaker

This grinder is equipped with a circuit breaker to
protect the motor from overloading. When the circuit
breaker trips, the reset button will pop out
approximately 1/4” which stops the power to the
grinder. The reset button is located on the front panel
of the Model 810, 835 and 875. To reset the circuit
breaker, wait two minutes then push in the reset
button. You will hear a click as it resets. If the grinder
does not operate after resetting the circuit breaker,
there may be an obstruction in the grinding
mechanism that is stalling the motor. Turn the grind
selector knob all the way to the left. Try restarting the
grinder. If the circuit breaker “trips” again, the
obstruction was not able to pass. In this case, the
Grinder Head should be cleaned out as described in the
Shear Disc Replacement section of this manual.

4 Grindmaster

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800 Series Coffee Grinders

Operation

Cleaning Instructions

NOTICE: The person cleaning the parts should do so

with clean hands.
The outside of the machine can be cleaned with warm

soapy water and a damp cloth.
Grinding parts should be cleaned with a stiff brush or

dry cloth. DO NOT USE WATER. See Shear Disc
Replacement for instructions on assembling and
disassembling grinder parts. Before reassembling, wipe
motor shaft with dry cloth.

All other parts that are in contact with food must be
washed with warm soapy water, rinsed, and air-dried.

Lubrication

None required.

Shear Disc Replacement

If the motor should run and no coffee is dispensed, the
Shear Disc may have sheared. Should this occur,
perform the following operations in the sequence
given (refer to following drawing).

Tools Required: Slotted Screwdriver

Pliers

WARNING: Unplug grinder to prevent electrical

shock.

1. Remove all of the coffee beans from the
hopper.

2. Remove the Grinder Cap by taking out the
2 Cap Screws.

3. (Model 890) Turn Feedworm Assembly such
that the slot in the assembly is vertical then

push inward to release the Shear Pin.

4. Pull out the Rotary Burr and Feedworm
Assembly. Clean out the Grinder Head,
removing all coffee particles from inside of
the Grinder Head and the Grinder Cap so
that it can be reset properly.

5. Check that no obstruction has been caught
on the surface of the teeth of either burr.
Remove the Shear Cover and broken pieces
of the Shear Disc or Shear Pin. You are now
ready to reassemble the grinder
mechanism.

6. Slide the Rotory Burr and Feedworm
Assembly onto the Drive Shaft.

(Model 810, 835, 875) Insert the shear drive
so that the Motor Shaft tongue engages
into the shear drive notch.

7. (Model 810, 835, 875) Insert a new Shear
Disc by aligning the slot in the Shear Drive
with the slot in the hub of the Feedworm.

(Model 890) Align slot in Feedworm
Assembly with the hole in the motor shaft.
Install new Shear Pin.

8. Reassemble the Shear Cover and Grinder
Cap. Make certain the Grinder Cap is
screwed on tight and is sealed properly
against the head and not tilted or
misaligned. Otherwise, a proper grind
cannot be obtained.

9. Your grinder is now ready to grind.

800 Series Coffee Grinders Grindmaster

®

5

Cleaning & Maintenance

If you still need help, call GMCW Technical Service Department, [phone] or [phone] (USA & Canada
only) (Monday through Friday 8 AM - 6 PM EST). Please have the model and serial number ready so that accurate
information can be given.

Prior authorization must be obtained from GMCW for all warranty claims.

GMCW provides the industry’s BEST warranty. Visit our website at GMCW.com for warranty terms and
conditions.

6 Grindmaster

®

800 Series Coffee Grinders

Troubleshooting Guide

Before you call for help, please read the following:

WARNING: Unplug power cord from outlet before cleaning or servicing your grinder.

Problem Possible Cause Solution

Grinder will not start when Bag not under spout. Place bag underneath spout.
START button is pushed Plug not in outlet properly. Install plug in outlet.

No power to outlet. Check outlet with lamp or radio to verify

outlet has power.

Grinder runs or hums but no Circuit breaker has tripped. Reset circuit breaker by pushing in reset
coffee is dispensed button until you hear a click.

Shear disc is broken. Replace shear disc. See Shear Disc

Replacement or instructions on back of

grinder.
Obstruction in opening to grinding Unplug unit. Empty beans out of hopper
chamber. and clear obstructions. See Shear Disc

Replacement for disassembly and

assembly instructions.

Excessive amount of coffee Defective chaff mixer spring. If bent, broken, or missing, replace spring.
chaff flying about If stuck open with coffee, clean out coffee

to free spring.
Outlet not properly grounded. Check power cord end and outlet for

proper ground.
Static electricity. Tighten all nuts, bolts, and screws and

verify outlet is grounded.

Circuit breaker continuously Insufficient amperage due to use of Plug unit directly into outlet. Do not use.
trips extension cord. extension cord.

Insufficient amperage due to Designate single line for grinder. Do not
overloaded line. use multi-outlet box.
Grind setting needs adjustment. Adjust grind to coarser setting (see Grind

Adjustment).

800 Series Coffee Grinders Grindmaster

®

7

Parts Diagram and List

8 Grindmaster

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800 Series Coffee Grinders

Parts Diagram and List (continued)

800 Series

Item # DESCRIPTION

120V GROCERY GRINDER PART NUMBERS

230V GROCERY GRINDER PART NUMBERS

810-BS

835-BS

875-BS &

875-RS

890-BS

890-B-T

810E-BG

835-B-

230VG

835-R-

230VG

835-R-

230VS

875-B-

230V

875-R-

230V

890E-BG

1 * Casing, grocery 83332 * 83362* 82356* 83332 * 83332 * 83362 *
2 * Base 83302 * 83321 * 82355* 83302 * 83321 * 83321 *
3 * Front panel 83316 * 83301 * 83363 * 82362* 83316 * 83301 * 83363 *
4 * Lower front 83305 * 80072 80073 82360 83305 * 80072 80073
5 * Top, bifold lid - 83308BK or 88308RK ­6 * Lid, bifold hinge - 88704BK or 88704RK -

7 *

Top, 800 series
sanitation

83451BK or 83451RK - 83451 *

8 * Lid, 800 series sanitation 83450BK or 83450RK - 83450 *

9 Knob, lid 86223 86246 86223 86246

10 Screw, #8 x 1/4 ph tr hd

11 Screw, #8 x 3/8" sl ovl 86914 86914

12 Plate, knob retainer 82024 82024
13 Knob, grind select 82022 82022
14 Pointer, knob 88027 88027
15 Screw, #6-32 x 1/4" 86866 86866
16 Plate, detent 83361 82025 83361 82025
17 Screw, #8-32 x 1/4" 86224 86224
18 Screw, grind adjust 82023 86434 82023 86434
19 Pin, grind adjust 71298 71298
20 Screw, 5/16-18 x 1" 86887 86887
21 Plunger, detent 83318 83318
22 Spring, detent 83443 83443
23 Grinder cap 82021 86439 82021 86439
24 Cover, shear 86355 86355

25

Disc, shear (890 - Shear
pin)

86123 86620 86123 86620

26 Drive, shear 86154 - 86154 ­27 Feedworm 85188 86468 85188 86468
28 Burr set 85281W 86430 85281W 86430

29 Screw, #10-32 x 5/16" 350-00014 350-00014

30 Feedworm spring - 86432 - 86432
31 Tension spring 86118 86438 86118 86438
32 Thrust collar 86304 - 86304 ­33 Grinder head 84171S 84172 86435 84171S 84172 86435
34 Nut, 1/4-20 cage 86864 86864

35

Motor, 1/2hp 120VAC
60Hz [230VAC 60Hz]

86419 86581 [86421] 86581

36 Gasket, hopper 88211 88211
37 Finger guard 83324 83324
38 Hopper 83356 88280 82365 83356 88280

39

Circuit breaker, 10amp
for 120VAC [5amp for
230VAC]

86618 [83107]

40

Screw, #10 x 1/2", sems,
tr ph

86868 86868

41 Screw, spout flap - 60288 - 60288

42

Eyelet, 0.162 ID, rolled
edge

- 82039 - 82039