SET UP ..........................................11
GENERAL OPERATING
INSTRUCTIONS ............................11
MAINTENANCE AND
SERVICING ...............................12
CLEANING, MAINTENANCE, AND
LUBRICATION ...............................12
TROUBLESHOOTING ......................13
PARTS LIST .................................14
MODEL 39797 ....................................8
MODEL 39798 ....................................8
UNPACKING .................................. 8
ASSEMBLY DIAGRAM ................15
LIMITED 1 YEAR / 90 DAY
WARRANTY ..............................16
Bench Grinder For technical questions, please call 1-800-444-3353. Page 2
Page 3
SAVE THIS MANUAL
Keep this manual for the safety warnings and precautions, assembly, operating, inspection, maintenance and cleaning
procedures. Write the product’s serial
number in the back of the manual near the
assembly diagram (or month and year of
purchase if product has no number). Keep
this manual and the receipt in a safe and
dry place for future reference.
IMPORTANT SAFETY
INFORMATION
In this manual, on the labeling,
and all other information provided with this product:
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.
NOTICE is used to
address practices
not related to personal injury.
CAUTION, without
the safety alert
symbol, is used to address
practices not related to
personal injury.
General Tool Safety Warnings
WARNING Read all safety
warnings and instructions.
Failure to follow the warnings and
instructions may result in electric
shock, re and/or serious injury.
Save all warnings and
instructions for future reference.
KEEP GUARDS IN PLACE and in 1.
working order.
REMOVE ADJUSTING KEYS AND 2.
WRENCHES. Form habit of checking to see that keys and adjusting
wrenches are removed from tool
before turning it on.
DANGER indicates
a hazardous
situation which, if not
avoided, will result in death or
serious injury.
WARNING
indicates a
hazardous situation which, if
not avoided, could result in
death or serious injury.
CAUTION, used
with the safety
alert symbol, indicates a
hazardous situation which, if
not avoided, could result in
minor or moderate injury.
Bench Grinder For technical questions, please call 1-800-444-3353. Page 3
KEEP WORK AREA CLEAN. Clut-3.
tered areas and benches invite accidents.
DON’T USE IN DANGEROUS EN-4.
VIRONMENT. Don’t use power tools
in damp or wet locations, or expose
them to rain. Keep work area well
lighted.
KEEP CHILDREN AWAY. All visitors 5.
should be kept safe distance from
work area.
MAKE WORKSHOP KID PROOF 6.
with padlocks, master switches, or by
removing starter keys.
Page 4
DON’T FORCE TOOL. It will do the 7.
job better and safer at the rate for
which it was designed.
USE RIGHT TOOL. Don’t force tool 8.
or attachment to do a job for which it
was not designed.
RECOMMENDED MINIMUM WIRE
GAUGE FOR EXTENSION CORDS
(120 VOLT)
NAMEPLATE
AMPERES
(at full load)
0 – 618161614
6.1 – 1018161412
10.1 – 1216161412
12.1 – 161412Do not use.
EXTENSION CORD
LENGTH
25’50’100’150’
TABLE A
glasses only have impact resistant
lenses, they are NOT safety glasses.
DON’T OVERREACH. Keep proper 12.
footing and balance at all times.
MAINTAIN TOOLS WITH CARE. 13.
Keep tools sharp and clean for best
and safest performance. Follow
instructions for lubricating and changing accessories.
DISCONNECT TOOLS before ser-14.
vicing; when changing accessories,
such as blades, bits, cutters, and the
like.
REDUCE THE RISK OF UNINTEN-15.
TIONAL STARTING. Make sure
switch is in off position before plugging in.
USE PROPER EXTENSION CORD. 9.
Make sure your extension cord is
in good condition. When using an
extension cord, be sure to use one
heavy enough to carry the current
your product will draw. An undersized
cord will cause a drop in line voltage
resulting in loss of power and overheating. Table A shows the correct
size to use depending on cord length
and nameplate ampere rating. If in
doubt, use the next heavier gauge.
The smaller the gauge number, the
heavier the cord.
WEAR PROPER APPAREL. Do not 10.
wear loose clothing, neckties, rings,
bracelets, or other jewelry which may
get caught in moving parts. Nonslip
footwear is recommended. Wear protective hair covering to contain long
hair.
ALWAYS USE SAFETY GLASSES. 11.
Also use face or dust mask if grinding
operation is dusty. Everyday eye-
USE RECOMMENDED ACCESSO-16.
RIES. Consult the owner’s manual for
recommended accessories. The use
of improper accessories may cause
risk of injury to persons.
NEVER STAND ON TOOL. Serious 17.
injury could occur if the tool is tipped
or if the grinding tool is unintentionally
contacted.
CHECK DAMAGED PARTS. Before 18.
further use of the tool, a guard or
other part that is damaged should
be carefully checked to determine
that it will operate properly and perform its intended function – check for
alignment of moving parts, binding
of moving parts, breakage of parts,
mounting, and any other conditions
that may affect its operation. A guard
or other part that is damaged should
be properly repaired or replaced.
DIRECTION OF FEED. Feed work 19.
into a blade or cutter against the
Bench Grinder For technical questions, please call 1-800-444-3353. Page 4
Page 5
direction of rotation of the blade or
cutter only.
equipment-grounding conductor to a
live terminal.
NEVER LEAVE TOOL RUNNING 20.
UNATTENDED. TURN POWER OFF.
GROUNDING INSTRUCTIONS
TO PREVENT
ELECTRIC SHOCK
AND DEATH FROM
INCORRECT GROUNDING
WIRE CONNECTION
READ AND FOLLOW THESE
INSTRUCTIONS:
110-120 V~ Grounded Tools: Tools
with Three Prong Plugs
In the event of a malfunction or 1.
breakdown, grounding provides a
path of least resistance for electric
current to reduce the risk of electric
shock. This tool is equipped with an
electric cord having an equipmentgrounding conductor and a grounding plug. The plug must be plugged
into a matching outlet that is properly
installed and grounded in accordance
with all local codes and ordinances.
Do not modify the plug provided – if it 2.
will not t the outlet, have the proper
outlet installed by a qualied electri-
cian.
Improper connection of the equip-3.
ment-grounding conductor can result in a risk of electric shock. The
conductor with insulation having an
outer surface that is green with or
without yellow stripes is the equipment-grounding conductor. If repair
or replacement of the electric cord or
plug is necessary, do not connect the
Check with a qualied electrician or 4.
service personnel if the grounding
instructions are not completely understood, or if in doubt as to whether the
tool is properly grounded.
Use only 3-wire extension cords that 5.
have 3-prong grounding plugs and
3-pole receptacles that accept the
tool’s plug.
Repair or replace damaged or worn 6.
cord immediately.
Grounding
Pin
125 V~ 3-Prong Plug and Outlet
(for up to 125 V~ and up to 15 A)
This tool is intended for use on a cir-7.
cuit that has an outlet that looks like
the one illustrated above in 125 V~ 3-Prong Plug and Outlet. The tool
has a grounding plug that looks like
the plug illustrated above in 125 V~ 3-Prong Plug and Outlet.
The outlet must be properly installed 8.
and grounded in accordance with all
codes and ordinances.
Do not use an adapter to connect this 9.
tool to a different outlet.
Bench Grinder For technical questions, please call 1-800-444-3353. Page 5
Page 6
Grinder Safety Warnings
For Your Own Safety Read Instruction
Manual Before Operating Grinder
Wear eye protection.1.
Use grinding wheel suitable for speed 2.
of grinder.
Replace cracked wheel immediately.3.
Always use guards and eye shields.4.
Do not overtighten wheel nut.5.
adequate protection. Eye protection
must be ANSI-approved and breathing protection must be NIOSH-ap-
proved for the specic hazards in the
work area.
Industrial applications must follow 15.
OSHA guidelines.
Maintain labels and nameplates on 16.
the tool. These carry important safety
information. If unreadable or missing, contact Harbor Freight Tools for a
replacement.
Use only anges furnished with the 6.
grinder.
Adjust distance between wheel and 7.
work rest to maintain 1/16 inch or
less separation as the diameter of the
wheel decreases with use.
Frequently clean grinding dust from 8.
beneath grinder.
Wear a full face shield over ANSI-9.
approved safety goggles during use.
Do not grind with side of wheel un-10.
less wheel is specically designed for
that type of grinding.
DO NOT OPERATE WITH ANY 11.
GUARD DISABLED, DAMAGED,
OR REMOVED.
The use of accessories or attach-12.
ments not recommended by the
manufacturer may result in a risk of
injury to persons.
When servicing use only identical 13.
replacement parts.
Only use safety equipment that has 14.
been approved by an appropriate
standards agency. Unapproved
safety equipment may not provide
Avoid unintentional starting. Prepare 17.
to begin work before turning on the
tool.
People with pacemakers should 18.
consult their physician(s) before use.
Electromagnetic elds in close proximity to heart pacemaker could cause
pacemaker interference or pacemaker failure.
WARNING: Some dust created by 19.
power sanding, sawing, grinding, drilling, and other construction activities,
contains chemicals known [to the
State of California] to cause cancer,
birth defects or other reproductive
harm. Some examples of these
chemicals are:
• Lead from lead-based paints
• Crystalline silica from bricks and ce-
ment or other masonry products
• Arsenic and chromium from chemically treated lumber
Your risk from these exposures varies, depending on how often you do
this type of work. To reduce your
exposure to these chemicals: work in
a well ventilated area, and work with
approved safety equipment, such as
those dust masks that are specially
designed to lter out microscopic
Bench Grinder For technical questions, please call 1-800-444-3353. Page 6
Page 7
particles. (California Health & Safety
Code § 25249.5, et seq.)
white or blue ngers), seek medical
advice as soon as possible.
WARNING: Handling the cord on 20.
this product will expose you to lead,
a chemical known to the State of
California to cause cancer, and birth
defects or other reproductive harm.
Wash hands after handling. (California Health & Safety Code § 25249.5,
et seq.)
The warnings, precautions, and in-21.
structions discussed in this instruction
manual cannot cover all possible conditions and situations that may occur.
It must be understood by the operator
that common sense and caution are
factors which cannot be built into this
product, but must be supplied by the
operator.
Vibration Safety
This tool vibrates during use. Repeated or long-term exposure to
vibration may cause temporary or
permanent physical injury, particularly
to the hands, arms and shoulders. To
reduce the risk of vibration-related
injury:
Do not smoke during use. Nico-2.
tine reduces the blood supply to the
hands and ngers, increasing the risk
of vibration-related injury.
Wear suitable gloves to reduce the 3.
vibration effects on the user.
Use tools with the lowest vibration 4.
when there is a choice between different processes.
Include vibration-free periods each 5.
day of work.
Grip tool as lightly as possible (while 6.
still keeping safe control of it). Let
the tool do the work.
To reduce vibration, maintain the tool 7.
as explained in this manual. If any
abnormal vibration occurs, stop use
immediately.
SAVE THESE
INSTRUCTIONS.
Anyone using vibrating tools regu-1.
larly or for an extended period should
rst be examined by a doctor and
then have regular medical checkups to ensure medical problems are
not being caused or worsened from
use. Pregnant women or people
who have impaired blood circulation
to the hand, past hand injuries, nervous system disorders, diabetes, or
Raynaud’s Disease should not use
this tool. If you feel any medical or
physical symptoms related to vibration (such as tingling, numbness, and
Bench Grinder For technical questions, please call 1-800-444-3353. Page 7
Page 8
SPECIFICATIONS
UNPACKING
All Models
180264
Motor No Load Speed3450 RPM
Arbor Size5/8” with 1/2” Adapter
Base Size5” x 7”
Mounting Holes2 x 3/8”
Work Light Bulb40 W Household type
MODEL 37822
Electrical Input120 V~ / 60 Hz / 1/2 HP
Wheel Size6” x 3/4” x 1/2”
Work Light Bulb40 W Household type
MODEL 37823
Electrical Input120 V~ / 60 Hz / 3/4 HP
Wheel Size8” x 3/4” x 5/8”
Work Light Bulb40 W Household type
When unpacking, make sure that the
item is intact and undamaged. If any parts
are missing or broken, please call Harbor
Freight Tools at 1-800-444-3353 as soon
as possible.
MODEL 39797
Electrical Input120 V~ / 60 Hz / 1/2 HP
Wheel Size6” x 3/4” x 1/2”
MODEL 39798
Electrical Input120 V~ / 60 Hz / 3/4 HP
Wheel Size8” x 3/4” x 5/8”
Bench Grinder For technical questions, please call 1-800-444-3353. Page 8
Page 9
INSTRUCTIONS FOR
PUTTING INTO USE
shown in Figure 1. Use bolts and
washers to secure them in place as
shown in Figure 1.
Read the ENTIRE IMPORTANT
SAFETY INFORMATION
section at the beginning of this
manual including all text under
subheadings therein before set
up or use of this product.
TO PREVENT
SERIOUS INJURY
FROM ACCIDENTAL
OPERATION:
Turn the tool off and unplug it
before assembling or making
any adjustments to the tool.
Note: For additional information regarding
the parts listed in the following pages,
refer to the Assembly Diagram near
the end of this manual.
Assembly
Installing Tool Rests -1.
Turn the Grinder off and unplug it.a.
Note: There is a left and a right tool rest.
Refer to Figure 1 to be certain that
you install them correctly.
The tool rests should be adjusted to c.
within 1/16” of the grinding wheel.
To adjust this distance, move Adjustable Rests (22 and 35) by loosening
bolts and moving them to the proper
position.
Installing Spark Guards -2.
FIGURE 2
a. Select spark guards (17 and 18),
washer and bolt. Install the right
spark guard to the wheel guard as
shown in Figure 2.
Adjust the spark guard to within b.
1/16” of the grinding wheel. Repeat
for left side.
Note: There is a left and right spark guard.
Refer to Figure 2 to be certain that
you install them correctly.
FIGURE 1
b. Install adjustable rests (22 and 35)
to the wheel guards (7 and 27) as
Bench Grinder For technical questions, please call 1-800-444-3353. Page 9
REV 01b
Page 10
Installing Bracket to Eye Shield -3.
FIGURE 3
a. Select one at bracket and one eye
shield. Assemble as shown in Figure 3.
Repeat for left eye shield.b.
Installing Eye Shield to Grinder -4.
For installation of the right eye shield a.
(19), make sure that the holes in the
eye shield bracket face downward.
FIGURE 4
b. Push eye shield bracket onto mount-
ing bracket until it locks into place as
shown in Figure 4.
Repeat for left eye shield.c.
Bench Grinder For technical questions, please call 1-800-444-3353. Page 10
Page 11
OPERATING INSTRUCTIONS
Read the ENTIRE IMPORTANT
SAFETY INFORMATION
section at the beginning of this
manual including all text under
subheadings therein before set
up or use of this product.
Work Piece and Work Area Set Up
Designate a work area that is clean 1.
and well-lit. The work area must not
allow access by children or pets to
prevent distraction and injury.
Route the power cord along a safe 2.
route to reach the work area without
creating a tripping hazard or exposing
the power cord to possible damage.
There must not be objects, such as 3.
utility lines, nearby that will present a
hazard while working.
General Operating Instructions
TO PREVENT
SERIOUS INJURY:
DO NOT OPERATE WITH ANY
GUARD DISABLED,
DAMAGED, OR REMOVED.
outward from the edge of the shank
of the screwdriver. They should be
at with intersecting faces perpendicular. Hold each face of the screwdriver against the wheel to true it up,
then ease the end straight into the
stone to grind it true.
Sharpening Knives - 3.
Remove metal from both faces of
most knives, working from the heavy
end of the blade toward the tip.
Sharpening Twist Drill Bits - 4.
Drill bits are best sharpened on a
sharpening jig but some sharpening
can be done on your bench grinder.
Begin on one side of the point at the
existing angle, then twist the bit while
maintaining a constant angle with the
grinding surface. Sharpen only the
tip. This technique requires considerable practice so try it a few times with
the grinder off. Be sure to maintain
the original cutting edge angle as this
is important to maintaining the efciency of your bits.
To prevent accidents, turn off the tool 5.
and disconnect its power supply after
use. Clean, then store the tool indoors out of children’s reach.
Sharpening Scissors - 1.
If possible take the scissors apart
to make the sharpening operation
easier and safer. Remove material
only from the outside surface and
work from the heavy end of the blade
toward the tip.
Sharpening Screwdrivers - 2.
The end of a properly sharpened
screwdriver will be a perfect rectan-
gle, absolutely at and perpendicular
to the center line of the shank. The
two sides and two faces will taper
Bench Grinder For technical questions, please call 1-800-444-3353. Page 11
Page 12
MAINTENANCE AND
SERVICING
Proceduresnotspecically
explained in this manual
must be performed only by a
qualiedtechnician.
TO PREVENT
SERIOUS INJURY
FROM ACCIDENTAL
OPERATION:
Turn the Power Switch of the
tool to its “OFF” position and
unplug the tool from its
electrical outlet before
performing any inspection,
maintenance, or cleaning
procedures.
TO PREVENT SERIOUS
INJURY FROM TOOL
FAILURE:
Do not use damaged
equipment. If abnormal noise
or vibration occurs, have the
problem corrected before
further use.
grooved, rounded, chipped, out of
true or loaded with foreign material.
Cracked wheels should be replaced
immediately.
Wheel Replacement - 4.
If you must replace a wheel be sure
to obtain one with a safe rated speed
at least as high as the rated RPM of
this grinder. Be sure tool is switched
off and unplugged before attempting
repairs.
Bulb Replacement - 5.
Allow bulb to cool completely before
replacing it. Replace it only with a 40
W or less household bulb.
6. WARNING! If the supply cord of
this power tool is damaged, it must
bereplacedonlybyaqualied
service technician.
Cleaning, Maintenance, and
Lubrication
BEFORE EACH USE,1. inspect the
general condition of the tool. Check
for loose hardware, misalignment or
binding of moving parts, cracked or
broken parts, damaged electrical wiring, and any other condition that may
affect its safe operation.
AFTER USE,2. wipe external surfaces
of the tool with clean cloth.
Care of Grinding Wheels - 3.
As a result of normal use, grinding wheels may become cracked,
Bench Grinder For technical questions, please call 1-800-444-3353. Page 12
Page 13
Troubleshooting
ProblemPossible CausesLikely Solutions
Tool will not start.Cord not connected.1.
Tool operates
slowly.
Performance
decreases over
time.
Excessive noise or
rattling.
Overheating.Forcing machine to work too fast.1.
Power being reduced by long or
small diameter extension cord.
Carbon brushes worn or damaged.Have qualied technician replace brushes.
Internal damage or wear. (Carbon
brushes or bearings, for example.)
Internal damage or wear. (Carbon 4.
brushes or switch, for example.)
Blocked motor housing vents. 2.
Motor being strained by long or 3.
small diameter extension cord.
Check that cord is plugged in.1.
Check power at outlet. If outlet is 2.
unpowered, turn off tool and check circuit
breaker. If breaker is tripped, make sure
circuit is right capacity for tool and circuit
has no other loads.
Turn off tool and allow to cool. Press 3.
reset button on tool.
Have technician service tool.4.
Eliminate use of extension cord. If an
extension cord is needed, use one with the
proper diameter for its length and load. See
Extension Cords in GROUNDING section.
Have technician service tool.
Allow machine to work at its own rate.1.
Wear ANSI-approved safety goggles and 2.
NIOSH-approved dust mask/respirator
while blowing dust out of motor using
compressed air.
Eliminate use of extension cord. If 3.
an extension cord is needed, use one
with the proper diameter for its length
and load. See Extension Cords in
GROUNDING section.
Follow all safety precautions whenever diagnosing or servicing the
tool. Disconnect power supply before service.
Bench Grinder For technical questions, please call 1-800-444-3353. Page 13
Page 14
PLEASE READ THE FOLLOWING CAREFULLY
THE MANUFACTURER AND/OR DISTRIBUTOR HAS PROVIDED THE PARTS LIST AND ASSEMBLY
DIAGRAM IN THIS MANUAL AS A REFERENCE TOOL ONLY. NEITHER THE MANUFACTURER OR
DISTRIBUTOR MAKES ANY REPRESENTATION OR WARRANTY OF ANY KIND TO THE BUYER THAT
HE OR SHE IS QUALIFIED TO MAKE ANY REPAIRS TO THE PRODUCT, OR THAT HE OR SHE IS
QUALIFIED TO REPLACE ANY PARTS OF THE PRODUCT. IN FACT, THE MANUFACTURER AND/
OR DISTRIBUTOR EXPRESSLY STATES THAT ALL REPAIRS AND PARTS REPLACEMENTS SHOULD
BE UNDERTAKEN BY CERTIFIED AND LICENSED TECHNICIANS, AND NOT BY THE BUYER. THE
BUYER ASSUMES ALL RISK AND LIABILITY ARISING OUT OF HIS OR HER REPAIRS TO THE
ORIGINAL PRODUCT OR REPLACEMENT PARTS THERETO, OR ARISING OUT OF HIS OR HER
INSTALLATION OF REPLACEMENT PARTS THERETO.
PARTS LIST
Note: Specify grinder model number when ordering parts.
PartDescription
1Screw
2Left Cover
3Nut
4aOuter Flange
4bInner Flange
5*Grinding Wheel
6Screw
7Left Wheel Guard
8Screw
9Motor End Bell
10Ball Bearing
11Nut
12Motor Stator
13Motor Case
14Motor Rotor
15Washer
16Bolt
17Left Spark Guard
18Right Spark Guard
19Eye Shield
20Washer
21Bolt
* Specify grit when ordering.
** Items 37822 or 37823 only.
Bench Grinder For technical questions, please call 1-800-444-3353. Page 14
Page 15
4b
ASSEMBLY DIAGRAM
4a
38
39
40
4b
4a
Record Product’s Serial Number Here:
Note: If product has no serial number, record month and year of purchase instead.
Note: Some parts are listed and shown for illustration purposes only, and are not avail-
able individually as replacement parts.
Bench Grinder For technical questions, please call 1-800-444-3353. Page 15
REV 01k
Page 16
LIMITED 1 YEAR / 90 DAY WARRANTY
Harbor Freight Tools Co. makes every effort to assure that its products meet high
quality and durability standards, and warrants to the original purchaser that for a period
of ninety days from date of purchase that the engine/motor, the belts (if so equipped),
and the blades (if so equipped) are free of defects in materials and workmanship. Harbor Freight Tools also warrants to the original purchaser, for a period of one year from
date of purchase, that all other parts and components of the product are free from
defects in materials and workmanship (90 days if used by a professional contractor or
if used as rental equipment). This warranty does not apply to damage due directly or
indirectly, to misuse, abuse, negligence or accidents, repairs or alterations outside our
facilities, normal wear and tear, or to lack of maintenance. 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 product. Some states do not allow the
exclusion or limitation of incidental or consequential damages, so the above limitation
of exclusion may not apply to you. THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL
OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF
MERCHANTABILITY AND FITNESS.
To take advantage of this warranty, the product or part must be returned to us with
transportation charges prepaid. Proof of purchase date and an explanation of the complaint must accompany the merchandise. If our inspection veries the defect, we will either repair or replace the product at our election or we may elect to refund the purchase
price if we cannot readily and quickly provide you with a replacement. We will return repaired products at our expense, but if we determine there is no defect, or that the defect
resulted from causes not within the scope of our warranty, then you must bear the cost
of returning the product.
This warranty gives you specic legal rights and you may also have other rights
which vary from state to state.
3491 Mission Oaks Blvd. • PO Box 6009 • Camarillo, CA 93011 • (800) 444-3353
Bench Grinder For technical questions, please call 1-800-444-3353. Page 16
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