Grizzly Grinder H7758 User Manual

MODEL H7758/H7759  
8" & 10" Grinders  
OWNER'S MANUAL  
COPYRIGHT © DECEMBER, 2005 BY GRIZZLY INDUSTRIAL, INC. REVISED APRIL, 2007  
WARNING: NO PORTION OF THIS MANUAL MAY BE REPRODUCED IN ANY SHAPE  
OR FORM WITHOUT THE WRITTEN APPROVAL OF GRIZZLY INDUSTRIAL, INC.  
#TR7764 PRINTED IN CHINA  
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Table of Contents  
INTRODUCTION............................................................................................................................... 2  
Foreword .................................................................................................................................... 2  
Contact Info................................................................................................................................ 2  
H7758 Machine Data Sheet....................................................................................................... 3  
H7759 Machine Data Sheet....................................................................................................... 4  
Identification ............................................................................................................................... 5  
SECTION 1: SAFETY....................................................................................................................... 6  
Safety Instructions for Machinery............................................................................................... 6  
SECTION 2: CIRCUIT REQUIREMENTS ........................................................................................ 9  
110V Operation.......................................................................................................................... 9  
SECTION 3: SET UP...................................................................................................................... 10  
Set Up Safety........................................................................................................................... 10  
Items Needed for Set Up ......................................................................................................... 10  
Unpacking ................................................................................................................................ 10  
Inventory & Assembly .............................................................................................................. 11  
SECTION 4: OPERATIONS ........................................................................................................... 13  
Operation Safety ...................................................................................................................... 13  
Wheel Care .............................................................................................................................. 14  
Wheel Selection ....................................................................................................................... 14  
Wheel Inspection...................................................................................................................... 15  
Wheel Replacement................................................................................................................. 15  
Accessories.............................................................................................................................. 16  
SECTION 5: SERVICE ................................................................................................................... 17  
Troubleshooting........................................................................................................................ 17  
H7758 Parts Breakdown .......................................................................................................... 18  
H7758 Parts List....................................................................................................................... 19  
H7759 Parts Breakdown .......................................................................................................... 20  
H7759 Parts List....................................................................................................................... 21  
WARRANTY AND RETURNS........................................................................................................ 22  
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INTRODUCTION  
Foreword  
Contact Info  
If you have any comments regarding this manual,  
please write to us at the address below:  
We are proud to offer the Model H7758/H7759 8"  
& 10" Bench Grinders. These machines are part  
of a growing Grizzly family of fine woodworking  
machinery. When used according to the guide-  
lines set forth in this manual, you can expect  
years of trouble-free, enjoyable operation and  
proof of Grizzly’s commitment to customer satis-  
faction.  
Grizzly Industrial, Inc.  
Technical Documentation Manager  
P.O. Box 2069  
C
/O  
Bellingham, WA 98227-2069  
We stand behind our machines. If you have any  
service questions or parts requests, please call or  
write us at the location listed below.  
We are pleased to provide this manual with the  
Model H7758/H7759. It was written to guide you  
through assembly, review safety considerations,  
and cover general operating procedures.  
Grizzly Industrial, Inc.  
1203 Lycoming Mall Circle  
Muncy, PA 17756  
Phone: (570) 546-9663  
Fax: (800) 438-5901  
The specifications, drawings, and photographs  
illustrated in this manual represent the Model  
H7758/H7759 as supplied when the manual was  
prepared. For your convenience, we always keep  
current Grizzly manuals available on our website at  
www.grizzly.com. Any updates to your machine  
will be reflected in these manuals as soon as they  
are complete.  
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H7758 Machine Data Sheet  
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H7759 Machine Data Sheet  
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Identification  
A
B
C
E
D
A. Eye Shield (to be used WITH safety glasses)  
B. Grinding Wheel  
C. Tool Rest  
D. ON/OFF Switch  
E. Wheel Safety Guard  
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SECTION 1: SAFETY  
For Your Own Safety, Read Instruction  
Manual Before Operating this Machine  
The purpose of safety symbols is to attract your attention to possible hazardous conditions. This  
manual uses a series of symbols and signal words which are intended to convey the level of  
importance of the safety messages. The progression of symbols is described below. Remember  
that safety messages by themselves do not eliminate danger and are not a substitute for proper  
accident prevention measures.  
Indicates an imminently hazardous situation which, if not avoided,  
WILL result in death or serious injury.  
Indicates a potentially hazardous situation which, if not avoided,  
COULD result in death or serious injury.  
Indicates a potentially hazardous situation which, if not avoided,  
MAY result in minor or moderate injury. It may also be used to alert  
against unsafe practices.  
This symbol is used to alert the user to useful information about  
proper operation of the machine.  
NOTICE  
Safety Instructions for Machinery  
1. READ THROUGH THE ENTIRE MANUAL  
BEFORE STARTING MACHINERY.  
Machinery presents serious injury hazards  
to untrained users.  
4. ALWAYS USE HEARING PROTECTION  
WHEN OPERATING MACHINERY.  
Machinery noise can cause permanent  
hearing damage.  
5. WEAR PROPER APPAREL. DO NOT  
wear loose clothing, gloves, neckties, rings,  
or jewelry which may get caught in moving  
parts. Wear protective hair covering to con-  
tain long hair and wear non-slip footwear.  
2. ALWAYS USE ANSI APPROVED  
SAFETY GLASSES WHEN OPERATING  
MACHINERY. Everyday eyeglasses only  
have impact resistant lenses, they are  
NOT safety glasses.  
6. NEVER OPERATE MACHINERY WHEN  
TIRED, OR UNDER THE INFLUENCE OF  
DRUGS OR ALCOHOL. Be mentally alert  
at all times when running machinery.  
3. ALWAYS WEAR AN ANSI APPROVED  
RESPIRATOR WHEN OPERATING  
MACHINERY THAT PRODUCES DUST.  
Wood dust is a carcinogen and can cause  
cancer and severe respiratory illnesses.  
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Safety Instructions for Machinery  
7. ONLY ALLOW TRAINED AND PROP-  
17. REMOVE ADJUSTING KEYS AND  
ERLY SUPERVISED PERSONNEL TO  
OPERATE MACHINERY. Make sure  
operation instructions are safe and clearly  
understood.  
WRENCHES. Make a habit of checking for  
keys and adjusting wrenches before turn-  
ing machinery ON.  
18. CHECK FOR DAMAGED PARTS  
BEFORE USING MACHINERY. Check  
for binding and alignment of parts, broken  
parts, part mounting, loose bolts, and any  
other conditions that may affect machine  
operation. Repair or replace damaged  
parts.  
8. KEEP CHILDREN AND VISITORS AWAY.  
Keep all children and visitors a safe dis-  
tance from the work area.  
9. MAKE WORKSHOP CHILD PROOF. Use  
padlocks, master switches, and remove  
start switch keys.  
19. USE RECOMMENDED ACCESSORIES.  
Refer to the instruction manual for recom-  
mended accessories. The use of improper  
accessories may cause risk of injury.  
10. NEVER LEAVE WHEN MACHINE IS  
RUNNING. Turn power OFF and allow all  
moving parts to come to a complete stop  
before leaving machine unattended.  
20. DO NOT FORCE MACHINERY. Work at  
the speed for which the machine or acces-  
sory was designed.  
11. DO NOT USE IN DANGEROUS  
ENVIRONMENTS. DO NOT use machin-  
ery in damp, wet locations, or where any  
flammable or noxious fumes may exist.  
21. SECURE WORKPIECE. Use clamps or  
a vise to hold the workpiece when practi-  
cal. A secured workpiece protects your  
hands and frees both hands to operate the  
machine.  
12. KEEP WORK AREA CLEAN AND WELL  
LIT. Clutter and dark shadows may cause  
accidents.  
22. DO NOT OVERREACH. Keep proper foot-  
13. USE A GROUNDED EXTENSION CORD  
RATEDFORTHEMACHINEAMPERAGE.  
Undersized cords overheat and lose power.  
Replace extension cords if they become  
damaged. DO NOT use extension cords  
for 220V machinery.  
ing and balance at all times.  
23. MANY MACHINES WILL EJECT THE  
WORKPIECETOWARDTHEOPERATOR.  
Know and avoid conditions that cause the  
workpiece to "kickback."  
14. ALWAYS DISCONNECT FROM POWER  
24. ALWAYS LOCK MOBILE BASES  
(IF USED) BEFORE OPERATING  
MACHINERY.  
SOURCE  
BEFORE  
SERVICING  
MACHINERY. Make sure switch is in OFF  
position before reconnecting.  
25. BE AWARE THAT CERTAIN DUST MAY  
BE HAZARDOUS to the respiratory sys-  
tems of people and animals, especially  
fine dust. Make sure you know the hazards  
associated with the type of dust you will be  
exposed to and always wear a respirator  
approved for that type of dust.  
15. MAINTAIN MACHINERY WITH CARE.  
Keep blades sharp and clean for best and  
safest performance. Follow instructions for  
lubricating and changing accessories.  
16. MAKE SURE GUARDS ARE IN PLACE  
AND WORK CORRECTLY BEFORE  
USING MACHINERY.  
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Additional Safety Instructions for Grinders  
1. EYE PROTECTION. Grinding ejects small  
particles at a high rate of speed. ALWAYS  
wear safety glasses when using this  
machine.  
7. LUNG PROTECTION. Grinding produces  
hazardous dust, which may cause long-  
term respiratory problems. Always wear a  
NIOSH approved dust mask or respirator  
when grinding.  
2. MOUNTING TO BENCH/STAND. An unse-  
cured grinder may become dangerously  
out of control during operation. Make sure  
grinder is FIRMLY secured to a bench/  
stand before use.  
8. SIDE GRINDING. Grinding on the side of  
wheels can cause the them to break and  
fly apart—unless the wheel is rated for side  
grinding.  
3. WHEEL SPEED RATING. Wheels oper-  
ated at a faster speed than rated for  
may break or fly apart. Before mount-  
ing a new wheel, be sure the wheel  
RPM rating is equal or higher than the  
speed of the grinder.  
9. TOP GRINDING. Grinding on the top  
of wheels greatly increases the risk of  
workpiece kickback. Always grind on the  
downward part of the wheel.  
10. HAND/WHEEL CONTACT. Grinding  
wheels can remove a lot of skin fast. Keep  
a firm grip on the workpiece and position  
your hands a safe distance away when  
grinding. Avoid wearing gloves as they  
may get caught in the grinding wheel and  
cause even more serious entanglement  
injuries.  
4. WHEEL FLANGES. Only use the flanges  
included with the grinder when mounting  
wheels. Other flanges may not properly  
secure the wheel and cause an accident.  
5. RING TEST. Perform a "ring test" on grind-  
ing wheels before installation to ensure  
that they are safe to use. A wheel that does  
not pass the ring test may break or fly apart  
during operation.  
11. TOOL REST POSITION. If the tool rest is  
too far away from the wheel, the workpiece  
may be pulled down, causing loss of con-  
trol and pulling your hand into the grinding  
wheel. Keep the tool rest within 18" from the  
wheel when operating.  
6. STARTING GRINDER. If a wheel is dam-  
aged, it will usually fly apart shortly after  
start-up. To protect yourself, always stand  
to the side of the grinder when turning it  
ON and allow it to gain full speed before  
standing in front of it.  
12. CRACKED WHEEL. Cracked wheels  
may break and fly apart during operation.  
Replace cracked wheels immediately!  
No list of safety guidelines can be complete.  
Every shop environment is different. Always  
consider safety first, as it applies to your  
individual working conditions. Use this and  
other machinery with caution and respect.  
Failure to do so could result in serious per-  
sonal injury, damage to equipment, or poor  
work results.  
Like all machinery there is potential danger  
when operating this machine. Accidents are  
frequently caused by lack of familiarity or  
failure to pay attention. Use this machine  
with respect and caution to lessen the pos-  
sibility of operator injury. If normal safety  
precautions are overlooked or ignored, seri-  
ous personal injury may occur.  
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SECTION 2: CIRCUIT REQUIREMENTS  
110V Operation  
Electrocution or fire could  
result if this machine is  
not grounded correctly or  
if your electrical configu-  
Serious personal injury could occur if you  
ration does not comply  
connect the machine to the power source  
with local and state codes.  
before you have completed the set up pro-  
Ensure compliance by  
cess. DO NOT connect the machine to the  
checking with a qualified  
power source until instructed to do so.  
electrician!  
Amperage Draw  
Model H7758...........................................5 Amps  
Model H7759......................................10.5 Amps  
Circuit Requirements  
We recommend connecting this machine to a  
dedicated circuit with a verified ground, using the  
circuit breaker size given below. Never replace a  
circuit breaker with one of higher amperage with-  
out consulting a qualified electrician to ensure  
compliance with wiring codes. If you are unsure  
about the wiring codes in your area or you  
plan to connect your machine to a shared cir-  
cuit, you may create a fire hazard—consult a  
qualified electrician to reduce this risk.  
This machine must have a ground prong in  
the plug to help ensure that it is grounded.  
DO NOT remove ground prong from plug  
to fit into a two-pronged outlet! If the plug  
will not fit the outlet, have the proper outlet  
installed by a qualified electrician.  
Circuit Breaker.......................................15 Amps  
Plug/Receptacle Type  
Included Plug Type........................... NEMA 5-15  
Extension Cords  
We do not recommend the use of extension  
cords, if you find it absolutely necessary:  
Use at least a 14 gauge cord that does not  
exceed 50 feet in length!  
The extension cord must also contain a  
ground wire and plug pin.  
A qualified electrician MUST size cords over  
50 feet long to prevent motor damage.  
Typical type 5-15 plug and receptacle.  
Figure .  
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SECTION 3: SET UP  
Set Up Safety  
Items Needed for  
Set Up  
The following items are needed to complete the  
set up process, but are not included with your  
machine:  
This machine presents  
serious injury hazards  
to untrained users. Read  
through this entire manu-  
al to become familiar with  
the controls and opera-  
tions before starting the  
machine!  
Description  
Qty  
Wrench or Socket 12mm............................ 1  
Wrench or Socket 10mm............................ 1  
Wrench or Socket 8mm.............................. 1  
Wrench or Socket 7mm.............................. 1  
Safety Glasses (for each person) .............. 1  
Phillips Screwdriver #2............................... 1  
Wear safety glasses dur-  
ing the entire set up pro-  
cess!  
Unpacking  
The Model H7758/H7759 was carefully packed  
when it left our warehouse. If you discover the  
machine is damaged after you have signed  
for delivery, please immediately call Customer  
Service at (570) 546-9663 for advice.  
The Model H7758/H7759  
is a heavy machine. DO  
NOT over-exert yourself  
while unpacking or mov-  
ing your machine—get  
assistance.  
Save the containers and all packing materials for  
possible inspection by the carrier or its agent.  
Otherwise, filing a freight claim can be difficult.  
When you are completely satisfied with the con-  
dition of your shipment, you should inventory the  
contents.  
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Inventory &  
Assembly  
EYE SHIELDS are the first level of protec-  
tion from flying debris or sparks and MUST  
be installed before operating the grinder.  
Use the list below and Figures 1 & 2 to inventory  
and assemble your grinder.  
H7759 Box Inventory  
Qty  
A. Grinder ....................................................... 1  
B. Eye Shields (DO NOT OVERTIGHTEN).... 2  
C. Support Arms ............................................. 2  
D. Support Retainers ...................................... 2  
E. Eyeshield Bracket Assemblies................... 2  
F. Tool Rests .................................................. 2  
G. Hex Bolts M8-1.25 X 14............................. 2  
H. Star Knobs M6-1 x 10 ................................ 2  
I. Flat Washers 8mm..................................... 2  
J. *Spark Deflectors ....................................... 2  
K. Phillips Head Screws M4-.7 X 10............... 4  
L. Flat Washers 4mm..................................... 4  
M. Lock Washers 4mm ................................... 4  
N. Hex Nuts M4-.7 .......................................... 4  
H7758 Box Inventory  
Qty  
A. Grinder ....................................................... 1  
B. Eye Shields (DO NOT OVERTIGHTEN).... 2  
C. Support Arms ............................................. 2  
D. Support Retainers ...................................... 2  
E. Eyeshield Bracket Assemblies................... 2  
F. Tool Rests .................................................. 2  
G. Hex Bolts M8-1.25 X 14............................. 2  
H. Hex Bolts M8-1.25 X 10............................. 2  
I. Hex Bolts M6-1 X 6.................................... 2  
J. Flat Washers 8mm..................................... 6  
K. Flat Washers 6mm..................................... 2  
L. Spark Deflectors......................................... 2  
M. Phillips Head Screws M4-.7 X 10............... 4  
N. Flat Washers 4mm..................................... 4  
O. Lock Washers 4mm ................................... 4  
P. Hex Nuts M4-.7 .......................................... 4  
* The Spark Deflectors (J) attach with the screw,  
hex nut, and washer that holds the wheel cover  
in place.  
M, N, O, P  
K, L, M, N  
B
B
E
E
C
C
L
J
I, K  
F
F
D
D
G, J  
G, I  
H, J  
H
Figure 2. H7759 assembly.  
Figure 1. H7758 assembly.  
In the event that any nonproprietary parts are  
missing (e.g. a nut or a washer), we would be  
glad to replace them, or for the sake of expedi-  
ency, replacements can be obtained at your local  
hardware store.  
NOTICE  
Some hardware/fasteners in the inventory  
list may arrive pre-installed on the machine.  
Check these locations before assuming any  
items from the inventory list are missing.  
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Mounting  
Test Run  
Mount the grinder on a workbench or stand (see  
Page 16) that is sturdy enough to hold the weight  
of the machine and any downward pressure that  
may be applied during operation.  
The test run ensures that the grinder and wheels  
did not get damaged during shipping.  
To test run the grinder:  
The workbench should have a level surface and  
be heavy, or attached to the floor, so it will not  
move during operation.  
1. Review and understand the grinder safety  
information on Page 6.  
2. Plug the grinder into the power source.  
The grinder can be mounted by drilling a holes in  
your workbench and securing the grinder with hex  
bolts, washers, and hex nuts. Or, you can secure  
it directly into the workbench with lag screws and  
flat washers. (Mounting hardware is not provided  
due to the many possible set ups and workbench  
thicknesses.)  
3. Stand away from the line of rotation of the  
wheel, turn the grinder ON, and allow it to run  
for one minute.  
—The grinder should run smoothly.  
—If there is an obvious problem with the way  
the grinder is running, turn it OFF immedi-  
ately and troubleshoot the problem, using  
the troubleshooting table on Page 17. DO  
NOT operate the grinder until it is fixed.  
When locating your grinder, remember:  
You'll need room for potentially large  
workpieces.  
Grinding spreads dust in the immediate vicin-  
ity of the grinder.  
Grinding creates flying sparks that MUST be  
out of reach of any flammables.  
You'll need a lot of light around the grinding  
wheel.  
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SECTION 4: OPERATIONS  
Operation Safety  
Grinding Tips  
The grinder is a safe tool when used properly. In  
addition to the safety instructions in this manual,  
the most important safety consideration is to use  
common sense at all times. What may be okay in  
one situation, may not be safe in another.  
Damage to your eyes, lungs, and ears could  
result from using this machine without  
proper protective gear. Always wear safety  
glasses, a respirator, and hearing protection  
when operating this machine.  
Here are some tips to keep in mind while  
grinding:  
Make sure all guards are in place.  
Remember that grinding often produces  
sparks. DO NOT allow anyone to stand in  
the path of the sparks. DO NOT grind near  
flammable materials.  
Maintain proper care of your wheels. Read  
the Wheel Care instructions for ideas on how  
to do this.  
Loose hair and cloth-  
ing could get caught in  
machinery and cause seri-  
ous personal injury. Keep  
loose clothing and long  
hair away from moving  
machinery.  
Wear the proper protective clothing. Particles  
flying off of a grinding wheel will be travel-  
ing very fast—prepare for this. Wear safety  
glasses/face shield, a dust mask, earplugs,  
a leather apron, and heavy leather boots.  
NOTICE  
Grasp the workpiece firmly and properly  
support it on the tool rest during grinding.  
Maintain even pressure and control of the  
workpiece when grinding.  
If you have never used this type of machine  
or equipment before, WE STRONGLY REC-  
OMMEND that you read books, trade maga-  
zines, or get formal training before begin-  
ning any projects. Regardless of the con-  
tent in this section, Grizzly Industrial will  
not be held liable for accidents caused by  
lack of training.  
Concentrate on the task at hand. STOP  
grinding if other people are distracting you or  
your mind is on something else.  
DO NOT grind on the side of the wheel.  
The wheels provided with the Model H7758/  
H7759 are not designed for side grinding.  
-13-  
H7758/H7759 8" & 10" Bench Grinders  
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Wheel Care  
Wheel Selection  
Your safety when grinding depends, on a large  
part, on the condition of the wheel during grind-  
ing. A wheel in poor condition presents the pos-  
sibility of breaking apart during rotation and injur-  
ing the operator and possibly causing property  
damage.  
The Model H7758 only accepts Type 1 wheels  
5
with a 8" bore. The Model H7759 only accepts  
Type 1 wheels with a 114" bore.  
Aluminum oxide and silicon carbide wheels are  
marked in a somewhat uniform manner by all the  
major manufacturers. Understanding these mark-  
ings will help you understand the capabilities of  
various wheels. Always refer to the manufactur-  
er’s grinding recommendations when selecting a  
wheel for your project.  
Here are some tips to help you avoid breaking  
the wheel:  
Always transport, store and handle wheels  
with care. Wheels may be damaged if they  
are dropped or if heavy objects are stacked  
on them.  
The basic format for wheel numbering is:  
Abrasive  
Type  
Bond  
Type  
Prefix  
1
Grit Size Grade  
60  
Select the right grinding wheel for the job.  
DO NOT grind material inappropriate for the  
wheel type.  
A
L
V
Select the right wheel for the machine. A  
machine that rotates at a higher RPM than  
the wheel is rated for may cause the wheel  
to fly apart.  
The Prefix is the manufacturer’s designation for a  
particular wheel type (eg, Type 1 wheels).  
The most common Abrasive Types used are A  
for Aluminum Oxide, C for Silicon Carbide, and  
occasionally SG for Seeded Gel.  
Mount the wheels properly. (See the Wheel  
Replacement instructions on Page 15 for  
guidance.) Never use a wheel with the wrong  
arbor size for the grinder.  
The Grit Size is a number that refers to the size  
of the abrasive grain in the wheel. The lower the  
number, the coarser the wheel. Ten is a very  
coarse wheel for roughing and 220 is usually the  
upper range for fine finish work.  
Do not abuse the wheel by jamming the work  
into the grinding wheel with excessive force.  
Learn how to use the grinder and the grind-  
ing wheels properly. Ask a trusted person  
with experience or consult with your local  
library to learn more.  
Grade is an indication of the hardness of the  
wheel—“A” being the softest and “Z” being the  
hardest.  
Bond Type refers to the type of bonding material  
used to hold the abrasive material. Most general  
purpose wheels will have a “V” indicating Vitrified  
Clay is used. Vitrified Clay provides high strength  
and good porosity. The other common bond type  
is “B” for resin where synthetic resins are used.  
These are used to grind cemented carbide and  
ceramic materials.  
Always spin water/coolant out of the wheel  
before turning the grinder OFF. This may  
take 5–10 minutes. (If moisture is left on the  
wheel, the wheel may warp.)  
Do not store wheels in damp or wet loca-  
tions.  
Grinding on side of the wheel may cause  
wheel damage.  
Note: There may be other numbers inserted that  
have meaning for a particular type of wheel. Refer  
to the manufacturer’s technical data for a com-  
plete explanation.  
Replace wheels when the diameter becomes  
2" smaller than its original size.  
-14-  
H7758/H7759 8" & 10" Bench Grinders  
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4. An undamaged wheel will emit a clear metal-  
lic ring or “ping” sound in each of these spots.  
A damaged wheel will respond with a dull  
thud that has no clear tone.  
Wheel Inspection  
Before mounting a new grinding wheel, it must  
be inspected. Do not assume that a wheel is in  
sound condition just because it is new—often  
damage can occur in shipping, with age, or with  
exposure to moisture.  
5. If you determine from the ring test that the  
wheel is damaged, DO NOT use it!  
Wheel Dressing  
First, do a Visual Inspection. Look for any  
cracks, chips, nicks or dents in the surface of the  
wheel. If you see any of these, DO NOT use the  
wheel.  
Depending on the type of grinding you do, the  
grinding wheel may require periodic dressing.  
Second, do a Ring Test. This test will give you an  
indication of any internal damage that may not be  
obvious during a visual inspection.  
There are several different types of wheel dress-  
ing devices available on the market (see Page  
16). Dressing restores the abrasive quality of the  
wheel surface and brings the wheel edge back to  
a square form.  
To perform a Ring Test:  
1. Make sure the wheel that you test is clean and  
Refer to the instructions that accompany your  
dressing accessory for complete details on how  
to properly dress a wheel.  
dry; otherwise, you may get false results.  
2. If size permits, balance the wheel with your  
finger in the hole. If this is not possible, hang  
the wheel in the air with a piece of cord or  
string looped through the hole in the center.  
Wheel Replacement  
3. At the spots shown in Figure 3, gently tap  
the wheel with a light non-metallic device  
such as the handle of a screwdriver or a  
wooden mallet.  
The wheel guard assembly must be removed in  
order to mount or dismount a grinding wheel.  
To replace a grinding wheel:  
1. UNPLUG THE GRINDER!  
2. Remove the three Phillips head screws and  
nuts that go through the outer guard. Take  
off the outer guard and the rim guard.  
 
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3. Use a wrench on the nut that holds the wheel  
on the arbor. Hold the wheel from turning  
with your other hand. Note that the wheel on  
the left-hand side of the machine has left-  
handed threads, so the arbor nut on that side  
must be turned clockwise to loosen.  
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Figure 3. Tapping locations when performing a  
4. Remove the outer wheel flange and the  
paper disc. Pull the wheel free from the  
arbor. There will also be a paper disc and a  
wheel flange on the other side of the wheel.  
ring test.  
-15-  
H7758/H7759 8" & 10" Bench Grinders  
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Accessories  
ALWAYS visually inspect and perform a  
“ring test” on a wheel before assembly. DO  
NOT use damaged wheels!  
Model H7763—Heavy Duty Grinder Stand  
5. Mount the new wheel as shown in Figure  
4. Always make certain there is a paper or  
fiber disc between the wheel flanges and  
the wheel itself. Tighten the nut snugly but  
DO NOT over-tighten. Over-tightening can  
crack the wheel.  
NEVER assemble a grinding wheel on the  
arbor without paper or fiber discs between  
the wheel and the flange. Not using the  
discs can put undue stress on the wheel,  
causing it to crack and possibly fall apart.  
Model H5891—12 Carat Diamond Dresser  
Model H5892—34 Carat Diamond Dresser  
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H5892  
H5891  
H7759 Replacement Wheels  
Model H8872—10" Aluminum Oxide 36 Grit  
Model H8874—10" Aluminum Oxide 60 Grit  
Figure 4. Assembly order for wheel installation.  
6. Re-install the spark deflectors and eye-  
shields.  
7. Run a new wheel for at least one minute  
while standing clear of the line of rotation. If  
a wheel does have defects it will generally fail  
as soon as it gets up to full speed.  
H7758 Replacement Wheels  
Model G1982—8" Aluminum Oxide 36 Grit  
Model G1983—8" Aluminum Oxide 60 Grit  
Model G1984—8" Silicon Carbide 120 Grit  
-16-  
H7758/H7759 8" & 10" Bench Grinders  
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SECTION 5: SERVICE  
Review the troubleshooting and procedures in this section to fix your machine if a problem develops. If you  
need replacement parts or you are unsure of your repair skills, then feel free to call our Technical Support  
at (570) 546-9663.  
Troubleshooting  
Motor & Electrical  
Symptom  
Possible Cause  
Possible Solution  
Motor will not start. 1.  
2.  
Low voltage.  
Open circuit in motor or loose connections.  
1.  
2.  
Check power line for proper voltage.  
Inspect all lead connections on motor for loose or open  
connections.  
Motor will not start; 1.  
fuses or circuit  
Short circuit in line cord or plug.  
1.  
2.  
3.  
Inspect cord or plug for damaged insulation and shorted  
wires.  
Inspect all connections on motor for loose or shorted  
terminals or worn insulation.  
breakers blow.  
2.  
Short circuit in motor or loose connections.  
Incorrect fuses or circuit breakers in power line.  
3.  
Install correct fuses or circuit breakers.  
Motor overheats.  
1.  
Motor overloaded.  
1.  
1.  
Reduce load on motor.  
Motor stalls (result- 1.  
ing in blown fuses  
Short circuit in motor or loose connections.  
Inspect connections on motor for loose or shorted termi-  
nals or worn insulation.  
or tripped circuit).  
2.  
3.  
4.  
Low voltage.  
Incorrect fuses or circuit breakers in power line.  
Motor overloaded.  
2
3.  
4.  
Correct the low voltage conditions.  
Install correct fuses or circuit breakers.  
Reduce load on motor.  
Machine  
slows 1.  
Operator is using too much pressure.  
1.  
Use less pressure when grinding.  
when operating.  
Wavy  
tion on surface of  
workpiece.  
condi- 1.  
Machine vibrating.  
1.  
Make sure machine is securely mounted on a solid sur-  
face.  
Use a holding device to firmly retain the workpiece.  
Dress the grinding wheel.  
2.  
3.  
4.  
Workpiece not being held firmly.  
Wheel face uneven.  
Wheel is too hard.  
2.  
3.  
4.  
Use softer wheel, or reduce the feed rate.  
Lines on surface of 1.  
Impurity on wheel surface.  
Workpiece not being held tightly.  
1.  
2.  
Dress the grinding wheel.  
Use a holding device to firmly retain the workpiece.  
workpiece.  
2.  
Burning  
or cracks in the 2.  
spots 1.  
Improper type of grinding wheel.  
Improper feed rate.  
1.  
2.  
Try a wheel which is softer style or a coarser grit.  
Slow down the rate of movement of the workpiece into  
workpiece.  
3.  
wheel.  
Coolant required.  
3.  
Add optional coolant system or introduce coolant by  
hand.  
Wheel dulls quickly, 1.  
grit falls off.  
2.  
Depth of cut too great.  
Wheel is too soft.  
1.  
2.  
Slow down the rate of movement of the workpiece into  
wheel.  
Wheel too soft for the material being ground, select  
harder bond.  
3.  
4.  
5.  
Wheel diameter too small.  
Bad wheel dress.  
Defective wheel bonding.  
3.  
4.  
5.  
Replace the wheel.  
Dress the wheel.  
Consult manufacturer of grinding wheel.  
Wheel clogs and 1.  
workpiece shows  
Wheel is too hard.  
1.  
Wheel too hard for the material being ground, select  
softer bond.  
burn marks.  
2.  
Feed rate too slow.  
2.  
Increase the rate of movement of the workpiece into  
wheel.  
3.  
4.  
Bad wheel dress.  
Coolant required.  
3.  
4.  
Dress the wheel.  
Add optional coolant system or introduce coolant by  
hand.  
-17-  
H7758/H7759 8" & 10" Bench Grinders  
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H7758 Parts Breakdown  
-18-  
H7758/H7759 8" & 10" Bench Grinders  
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H7758 Parts List  
REF PART #  
DESCRIPTION  
REF PART #  
DESCRIPTION  
1
PS09M  
PW02M  
PHLP HD SCR M5-.8 X 10  
FLAT WASHER 5MM  
31  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
PH7758031 STATOR  
PH7758032 CORD CLIP  
2
3
PH7758003 WHEEL COVER  
PN21M HEX NUT M16-2 (LH)  
PTLW01M  
PS07M  
EXT TOOTH WASHER 4MM  
4
PHLP HD SCR M4-.7 X 8  
BALL BEARING 6203  
5
PH7758005 WHEEL FLANGE  
P6203  
6
PH7758006 WHEEL TYPE-1 36-GRIT 8" X 1" X 5/8"  
PH7758036 ROTOR  
7
PLW01M  
PH7758008 LEFT SAFE GUARD  
PN06M HEX NUT M5-.8  
PH7758010 LEFT TOOL REST  
LOCK WASHER 5MM  
PH7758037 BASE  
8
PH7758038 CORD BUSHING FIXED PLATE  
9
PS05M  
PHLP HD SCR M5-.8 X 8  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
PH7758040 CORD CLIP FIXED PLATE  
PH7758041 CORD AND PLUG  
PH7758042 SWITCH PLATE  
PH7758043 SWITCH  
PB17M  
HEX BOLT M8-1.25 X 10  
PH7758012 LEFT SPARK DEFLECTOR  
PW03M  
PB88M  
FLAT WASHER 6MM  
HEX BOLT M6-1 X 6  
PH7758044 BASE BOTTOM COVER  
PH7758045 RUBBER FOOT  
PH7758015 BRACKET  
PW01M  
PB84M  
FLAT WASHER 8MM  
HEX BOLT M8-1.25 X 14  
PH7758046 FENDER WASHER 5MM  
PS40M  
PS04M  
PN03M  
PHLP HD SCR M5-.8 X 16  
PHLP HD SCR M8-1.25 X 20  
HEX NUT M8-1.25  
PH7758018 LEFT EYESHIELD MOUNTING ROD  
PCB22M  
PS38M  
CARRIAGE BOLT M6-1 X 16  
PHLP HD SCR M4-.7 X 10  
PH7758050 CAPACITOR 20M 300VAC 2.5"L X 1.5"D  
PH7758051 RIGHT SPARK DEFLECTOR  
PH7758052 RIGHT TOOL REST  
PH7758021 EYESHIELD PRESSURE PLATE  
PH7758022 EYESHIELD  
PW05M  
PLW02M  
PN04M  
FLAT WASHER 4MM  
LOCK WASHER 4MM  
HEX NUT M4-.7  
PH7758053 RIGHT SAFE GUARD  
PH7758054 RIGHT EYESHIELD MOUNTING ROD  
PH7758055 WHEEL TYPE-1 60-GRIT 8" X 1" X 5/8"  
PLW03M  
PN01M  
LOCK WASHER 6MM  
HEX NUT M6-1  
PN13M  
PH7758057 CAPACITOR HOLDER  
PLW04M LOCK WASHER 8MM  
PH7758059 MACHINE ID LABEL  
HEX NUT M16-2  
PS105M  
PHLP HD SCR M5-.8 X 60  
PH7758029 END BELL  
PH7758030 WAVE LOCK WASHER 40MM  
Safety labels warn about machine hazards and ways to prevent injury. The owner of this machine  
MUST maintain the original location and readability of the labels on the machine. If any label is  
removed or becomes unreadable, REPLACE that label before using the machine again. Contact  
-19-  
H7758/H7759 8" & 10" Bench Grinders  
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H7759 Parts Breakdown  
 
 
 
 
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-20-  
H7758/H7759 8" & 10" Bench Grinders  
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H7759 Parts List  
REF PART #  
DESCRIPTION  
REF PART #  
DESCRIPTION  
1
PS06M  
PW02M  
PHLP HD SCR M5-.8 X 20  
FLAT WASHER 5MM  
32  
33  
34  
35  
36  
37  
38  
39  
40  
41  
42  
43  
44  
45  
46  
47  
48  
49  
50  
51  
52  
53  
54  
55  
56  
57  
58  
59  
60  
61  
PH7759032 RIGHT END CAP  
2
PH7759033 STAR KNOB M6-1 X 10  
PH7759034 RIGHT WORK REST  
3
PH7759003 RUBBER FOOT  
PH7759004 BASE PLATE  
4
PN06M  
PH7759036 RIGHT SAFE GUARD  
PS11M PHLP HD SCR M6-1 X 16  
HEX NUT M5-.8  
5
PB07M  
HEX BOLT M8-1.25 X 25  
LOCK WASHER 8MM  
6
PLW04M  
7
PH7759007 BASE  
PH7759038 EYESHIELD MOUNTING ROD  
PH7759039 EYESHIELD  
8
PS05M  
PHLP HD SCR M5-.8 X 8  
9
PH7759009 SELF-LOCK SWITCH  
PH7759010 CORD CLIP FIXED PLATE  
PS09M  
PHLP HD SCR M5-.8 X 10  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
25  
26  
27  
28  
29  
30  
31  
PH7759041 SWITCH PLATE  
PS05M  
PHLP HD SCR M5-.8 X 8  
PH7759042 CAPACITOR HOLDER  
PH7759043 LEFT SAFE COVER  
PH7759012 WIRE BUSHING  
PH7759013 POWER CORD  
PN36M  
HEX NUT M20-2.5 LH  
PS38M  
PHLP HD SCR M4-.7 X 10  
PH7759045 WHEEL TYPE-1 36 GRIT 10" X 1" X 1-1/4"  
PH7759046 LEFT WHEEL GUARD  
PW05M  
PTLW01M  
FLAT WASHER 4MM  
EXT TOOTH WASHER 4MM  
PH7759047 LEFT WORK REST  
PH7759017 CORD CLIP  
PH7759048 CAPACITOR 150M 125V 1.375"D X 3.125"L  
PH7759049 RIGHT SPARK DEFECTOR  
PH7759050 LEFT SPARK DEFECTOR  
PH7759018 OUTER WHEEL FLANGE  
PH7759019 WHEEL TYPE-1 60 GRIT 10" X 1" X 1-1/4"  
PN28M  
HEX NUT M20-2.5  
PLW02M  
LOCK WASHER 4MM  
PH7759021 RIGHT WHEEL GUARD COVER  
PH7759052 INNER WHEEL FLANGE  
PH7759053 FENDER WASHER 5MM  
PS105M  
PS47M  
PHLP HD SCR M5-.8 X 60  
PHLP HD SCR M6-1 X 25  
LOCK WASHER 6MM  
PS07M  
PN04M  
PHLP HD SCR M4-.7 X 8  
HEX NUT M4-.7  
PLW03M  
PH7759025 LEFT END CAP  
PH7759056 DOME BOLT  
PH7759026 WAVE LOCK WASHER 52MM  
PH7759057 PRESSURE PLATE  
PH7759058 BIG FLAT WASHER 8MM  
P6205  
BEARING 6205  
PH7759028 LOCK WASHER  
PH7759029 CENTRIFUGAL SWITCH  
PH7759030 STATOR  
PS106M  
PHLP HD SCR M8-1.25 X 14  
PH7759060 EYESHIELD PRESSURE PLATE  
PH7759061 MACHINE ID LABEL  
PH7759031 ROTOR  
Safety labels warn about machine hazards and ways to prevent injury. The owner of this machine  
MUST maintain the original location and readability of the labels on the machine. If any label is  
removed or becomes unreadable, REPLACE that label before using the machine again. Contact  
-21-  
H7758/H7759 8" & 10" Bench Grinders  
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WARRANTY AND RETURNS  
Grizzly Industrial, Inc. warrants every product it sells for a period of 1 year to the original purchaser from  
the date of purchase. This warranty does not apply to defects due directly or indirectly to misuse, abuse,  
negligence, accidents, repairs or alterations or lack of maintenance. This is Grizzly’s sole written warranty  
and any and all warranties that may be implied by law, including any merchantability or fitness, for any par-  
ticular purpose, are hereby limited to the duration of this written warranty. We do not warrant or represent  
that the merchandise complies with the provisions of any law or acts unless the manufacturer so warrants.  
In no event shall Grizzly’s liability under this warranty exceed the purchase price paid for the product and  
any legal actions brought against Grizzly shall be tried in the State of Washington, County of Whatcom.  
We shall in no event be liable for death, injuries to persons or property or for incidental, contingent, special,  
or consequential damages arising from the use of our products.  
To take advantage of this warranty, contact us by mail or phone and give us all the details. We will then  
issue you a “Return Number,’’ which must be clearly posted on the outside as well as the inside of the  
carton. We will not accept any item back without this number. Proof of purchase must accompany the  
merchandise.  
The manufacturers reserve the right to change specifications at any time because they constantly strive to  
achieve better quality equipment. We make every effort to ensure that our products meet high quality and  
durability standards and we hope you never need to use this warranty.  
Please feel free to write or call us if you have any questions about the machine or the manual.  
Thank you again for your business and continued support. We hope to serve you again soon.  
-22-  
H7758/H7759 8" & 10" Bench Grinders  
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