Northern Industrial Tools 15258 User manual

10 "
BENCH GRINDER
OWNER'S MANUAL
Item # 15258
WARNING:
Read carefully and understand all INSTRUCTIONS before
operating. Failure to follow the safety rules and other basic
safety precautions may result in serious personal injury.

Thank you very much for choosing a NORTHERN TOOL + EQUIPMENT CO., INC.
Product! For future reference, please complete the owner's record below:
Model: _______________ Purchase Date: _______________
Save the receipt, warranty and these instructions. It is important that you read the
entire manual to become familiar with this product before you begin using it.
This machine is designed for certain applications only. Northern Tool + Equipment
cannot be responsible for issues arising from modification. We strongly recommend
this machine is not modified and/or used for any application other than that for
which it was designed. If you have any questions relative to a particular application,
DO NOT use the machine until you have first contacted Northern Tool + Equipment
to determine if it can or should be performed on the product.
For technical questions please call 1-800-222-5381.
INTENDED USE
This 10" bench grinder is designed for general metal grinding and sharpening.
TECHNICAL SPECIFICATIONS
Description Specifications
Voltage/Frequeney: 120V / 60Hz
Power: 4/5 HP
Rated running speed: 3450 RPM
Wheel Size: 10" x 1" x 3/4"
GENERAL SAFETY RULES
WARNING! Read and understand all instructions. Failure to follow all instructions listed
below may result in electric shock, fire and/or serious injury.
WARNING! The warnings, cautions, and instructions discussed in this instruction
manual cannot cover all possible conditions or situations that could 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.
SAVE THESE INSTRUCTIONS
WORK AREA
• Keep work area clean, free of clutter and well lit. Cluttered and dark work areas can
cause accidents.
• Do not use your tool where there is a risk of causing a fire or an explosion; e.g. in
the presence of flammable liquids, gasses, or dust. Power tools create sparks, which may
ignite the dust or fumes.
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• Keep children and bystanders away while operating a power tool. Distractions can
cause you to lose control, so visitors should remain at a safe distance from the work area.
• Be aware of all power lines, electrical circuits, water pipes and other mechanical haz-
ards in your work area, particularly those hazards below the work surface hidden from the
operator's view that may be unintentionally contacted and may cause personal harm or
property damage.
• Be alert of your surroundings. Using power tools in confined work areas may put you
dangerously close to cutting tools and rotating parts.
ELECTRICAL SAFETY
WARNING! Always check to ensure the power supply corresponds to the voltage on the
rating plate.
• Do not abuse the cord. Never carry a portable tool by its power cord, or yank tool or
extension cords from the receptacle. Keep power and extension cords away from heat, oil,
sharp edges or moving parts. Replace damaged cords immediately. Damaged cords may
cause a fire and increase the risk of electric shock.
• Grounded tools must be plugged into an outlet properly installed and grounded in accor-
dance with all codes and ordinances. Never remove the grounding prong or modify the
plug in any way. Do not use any adapter plugs. Check with a qualified electrician if you are
in doubt as to whether the outlet is properly grounded.
• Double insulated tools are equipped with a polarized plug (one blade is wider than the
other). This plug will fit in a polarized outlet only one way. If the plug does not fit fully in the
outlet, reverse the plug. If it still doesn't fit, contact a qualified electrician to install a polar-
ized outlet. Do not change the plug in any way.
• Avoid body contact with grounded surfaces such as pipes, radiators, ranges, and refrig-
erators. There is an increase risk of electric shock if your body is grounded.
• When operating a power tool outside, use an outdoor extension cord marked “W-A” or
“W.” These cords are rated for outdoor use and reduce the risk of electric shock.
• Extension Cord Use:
A. Use only 'Listed' extension cords. If used outdoors, they must be marked “For
Outdoor Use.” Those cords having 3-prong grounding type plugs and mating recepta-
cles are to be used with grounded tools.
B. Replace damaged or worn cords immediately.
C. Check the name plate rating of your tool. Use of improper size or gauge of extension
cord may cause unsafe or inefficient operation of your tool. Be sure your extension
cord is rated to allow sufficient current flow to the motor. For the proper wire gauge
for your tool, see chart.
CHART FOR MINIMUM WIRE SIZE OF EXTENSION CORD:
If in doubt, use larger cord. Be sure to check voltage requirements of the tool to your
incoming power source.

• Do not expose power tools to rain or wet conditions. Water entering a power tool will
increase the risk of electric shock.
• Do not let your fingers touch the terminals of plug when installing to or removing from
the outlet.
• Ground fault circuit interrupters. If work area is not equipped with a permanently
installed Ground Fault Circuit Interrupter outlet (GFCI), use a plug-in GFCI between power
tool or extension cord and power receptacle.
PERSONAL SAFETY
• Stay alert, watch what you are doing and use common sense when operating a power
tool. Do not use a power tool while you are tired or under the influence of drugs, alcohol or
medication. A moment of inattention while operating power tools may result in serious
personal injury.
• Dress properly. Do not wear loose clothing, dangling objects, or jewelry. Keep your hair,
clothing and gloves away from moving parts. Loose clothes, jewelry or long hair can be
caught in moving parts. Air vents often cover moving parts and should be avoided.
• Use safety apparel and equipment. Use safety goggles or safety glasses with side
shields which comply with current national standards, or when needed, a face shield. Use
as dust mask in dusty work conditions. This applies to all persons in the work area. Also
use non-skid safety shoes, hardhat, gloves, dust collection systems, and hearing
protection when appropriate.
• Avoid accidental starting. Do not carry the power tool with your finger on the switch.
Ensure the switch is in the off position before plugging tool into power outlet. In the event
of a power failure, while a tool is being used, turn the switch off to prevent surprise starting
when power is restored.
• Do not overreach. Keep proper footing and balance at all times.
• Remove adjusting keys or wrenches before connecting to the power supply or turning
on the tool. A wrench or key that is left attached to a rotating part of the tool may result in
personal injury.
TOOL USE AND CARE
• Do not force the tool. Tools do a better and safer job when used in the manner for which
they are designed. Plan your work, and use the correct tool for the job.
• Never use a tool with a malfunctioning switch. Any power tool that cannot be controlled
with the switch is dangerous and must be repaired by an authorized service representative
before using.
• Disconnect power from tool and place the switch in the locked or off position before
servicing, adjusting, installing accessories or attachments, or storing. Such preventive
safety measures reduce the risk of starting the power tool accidentally.
• Secure work with clamps or a vise instead of your hand to hold work when practical. This
safety precaution allows for proper tool operation using both hands.
• Store idle tools. When tools are not is use, store them in a dry, secure place out of the
reach of children. Inspect tools for good working condition prior to storage and before re-use.
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• Use only accessories that are recommended by the manufacturer for your model.
Accessories that may be suitable for one tool may create a risk of injury when used on
another tool.
• Keep guards in place and in working order.
• Never leave tool running unattended.
UNPACKING
When unpacking the Bench Grinder, please check if any parts are missing or broken, please
call Northern Tool + Equipment.
Description Qty
Bench Grinder Unit . . . . . . . . . . . .1
Eye Shield . . . . . . . . . . . . . . . . . . .2
Adjustable tool rest . . . . . . . . . . . .2
Instruction manual . . . . . . . . . . . . .1
ASSEMBLY
The 10” Bench Grinder requires minor assembly. The assembly instructions below are written
for the right side but the left side is identical.
Tool Rest Assembly
Step 1: Take right tool rest out from spare parts bag.
Step 2: Fix right tool rest (#26) on right inner cover.
Step 3: Pivot the tool rest down and forward so that it is in a horizontal position. Fix right tool
rest by following order: washer, spring washer, bolt(#34), as shown in Figure 1.
Step 4: Adjust the tool rest (#26) to the desired distance from the grinder wheel. In no
circumstances should the tool rest be closer than 1/8''from the grinder wheel.
Step 5: Tighten the two bolts on right tool rest.
Figure 1

Eye Shield Assembly
Step 1: Attach the eye shield assembly to the shield supports(#38) using bolts(#39), eye
shields(#37), spring washer(#22), washer(#23), nut(#24), as shown in Figure 2.
Step 2: Remove the bolt(#33), spring washer(#22), washer(#23), nut(#24) from the
wheel cover.
Step 3: Align the EYE SHIELD Assembly with holes and replace the WHEEL COVER BOLT
and NUT.
Step 4: Adjust the EYE SHIELD to the desired position and tighten the WHEEL COVER NUT.
Remove Grinding Wheel
Step 1: Remove left grinding wheel cover(#23) by unscrewing bolt(#33), and nut(#24).
Step 2: Place adjustable wrenches on both WHEEL MOUNTING NUTS(#40/31).
Step 3: To remove the right hand GRINDING WHEEL (#29) turn its WHEEL MOUNTING
NUT clockwise while keeping the left hand WHEEL MOUNTING NUT stationary. To
remove the left hand GRINDING WHEEL turn its WHEEL MOUNTING NUT counter-
clockwise while keeping the right hand WHEEL MOUNTING NUT stationary.
Step 4: Slide the WHEEL MOUNTING WASHER (#27) off of the SPINDLE (#4).
Step 5: Slide the GRINDING WHEEL off of the SPINDLE (#4).
Installing Grinding Wheel
Step 1: Make sure the inside wheel mounting washer(#27) is on the spindle(#4) with its
concave side facing out as shown in Figure 3.
Step 2: Place the GRINDING WHEEL (#21) on the SPINDLE.
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Figure 2

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Step 3: Place the outside WHEEL MOUNTING WASHER (#30) on the SPINDLE with its
concave side facing in.
Step 4: Place the WHEEL MOUNTING NUT (#31) on the SPINDLE and tighten.
Caution: Do not over tighten the WHEEL MOUNTING NUT as it may crack the
GRINDING WHEEL.
Step 5: Replace both WHEEL COVERS (#32) and secure with their BOLTS (#33), NUTS (#24).
OPERATION
Caution: The grinding wheels must always be checked for cracks of imperfections.
This is done with the “ring test”. Tap the wheel gently near the outer rim with the handle of a
screwdriver; you should hear a clear bell-like ringing. If a dull thud occurs do not use the
wheel! This means the wheel has been damaged and will, most likely, come apart during
normal operations.
Operation Notes
The workpiece will quickly become heated. Frequently quench the workpiece in water during
the grinding process. If the metal becomes heated so much that it gets blue-colored, it will
be too soft to be useful. You must grind off the part that is colored, cool the workpiece and
start again.
Figure 3

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General operation
Step 1: Obtain a tray that is large enough for the workpiece to fit into, fill it with water and
place it near the Bench Grinder.
Step 2: Turn the Bench Grinder on.
Step 3: Once the GRINDING WHEEL has reached full speed, bring the workpiece up to the
wheel gently and without jarring.
Step 4: Use the TOOL REST (#26/35) to steady the workpiece.
Step 5: The workpiece will become quickly heated. Frequently quench it in water.
MAINTENANCE
WARNING: Make sure this tool is disconnected from its power source before attempting
any maintenance, cleaning, or inspection.
• Maintain your tools. It is recommended that the general condition of any tool be exam-
ined before it is used. Keep your tools in good repair by adopting a program of conscien-
tious repair and maintenance in accordance with the recommended procedures found in
this manual. If any abnormal vibrations or noise occurs, turn the tool off immediately and
have the problem corrected before further use. Have necessary repairs made by qualified
service personnel.
• Keep cutting tools sharp and clean. Properly maintained cutting tools with sharp cutting
edges are less likely to bind and are easier to control. Keep handles dry, clean, and free
from oil and grease.
• Cleaning. Use only soap and a damp cloth to clean your tools. Many household cleaners
are harmful to plastics and other insulation. Never let liquid get inside a tool.
WARRANTY
One Year Warranty
For warranty questions, call 1-800-222-5381

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DIAGRAM & PARTS LIST
1End Closure 21
2
22
3Bearing 23 Spring Washer
4Rotor Assembly 24
5 Stator Assembly 25 Right inner Guard
6 Cable 26 Right Tool Rest
7Strain Relief 27 Grinding Wheel Washer
8 Capacitor 28 GringdingWheel Sheath
9 Capacitor Clip 29
10 Base Plate 30 Grinding Wheel Washer
11
31 Nut
12 32 Outer Guard
13
33
14 Spring Washer 34
15 35 Left Tool Rest
16 Switch 36 Left inner Guard
17
37 Eye Shield
18 Switch panel 38 Lens Bracket
19 Base 39
20 Housing 40 Left Screw
PARTS LIST

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