Grindmaster 810 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®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®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®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

800 Series Coffee Grinders Grindmaster®9
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
43 Spout flap - 82036 - 82036
44 Screw, chaff spring 07023-01 86806 07023-04 86806
45 Chaff spring 84154 82026 84154 82026
46 Screw, #8-32 x 3/8" 82124 82124
47 Spout 88033 80088 82019 88033 80088 82019
48 Motor shelf 83334 83334G 83334 83334G 83334 83334 83334 83334G
49 Bolt, 1/4-20 x 5/8" 86872 86872
50 Nut, 1/4-20 Nylon - 60007 87049 - 87049 60007
51 Bushing, spacer - 83253 - 83253
52 Bag, actuator - 80084 - 80084
53 Bushing, flanged - 83252 - 83252
54 Bracket, switch - 83250 - 83250
55 Switch, micro - 80083 - 80083
56 Screw, #4-40 x 5/8" sl bd
hd - 86928 - 86928
57 Nut, 4-40 hex - 86929 - 86929
58 Capacitor, 120VAC 60Hz
[230VAC 50Hz] 86144 [86179]
59 Screw, #8-32 x 3/8" 86874 86874
60 Screw, #8-32 x 1/4" - -
61 Relay, 120VAC
[Relay, 230VAC] - 85303 - [85275] [83106]
62 Tidy tray drawer - 83323 - 83323
63 Tidy tray cover - 83322 - 83322
64 Power cord, standard
120VAC [1.5MM CE] 86222 [61453]
65 Strain relief, standard
cord 86071 86071
66 Switch, start 70449 70445 88056 88056 70449 70445 88056
67 Switch, stop - 83327 88057 - 83327 88057
70 Screw, #6-32 x 1/4", SS - 86993
71 Relay, Motor Start,
230VAC - 86424
72 Finger guard - - 83297
73 Screw, #8-32 x 1/2",
Ground 86867 86867
74 Nut, #8-32, KEPS 86810 86810 86810
77 Harness, wiring 83341 82029 84143 82029
78 Harness, bag switch - 80086 - 80086

800 Series Coffee Grinders Grindmaster®11
Wiring Diagram (continued)
800 Series 230V, 50Hz Wiring Diagrams