ET-3302-J 7-INCH
GRINDER
CAUTION
RISK OF INJURY!
READ MANUAL BEFORE OPERATING!
THIS MANUAL IS AN IMPORTANT PART OF THE DISC GRINDER
AND SHOULD REMAIN WITH THIS UNIT WHEN YOU SELL OR RENT IT.
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Table of Content
SAFETY .................................................................................................................. 4-10
GENERAL SAFETY RULES .................................................................. 4-10
FUNCTIONAL DESCRIPTION............................................................................... 11
MODEL ................................................................................................... 11
NAME OF PARTS .................................................................................. 11
SPECIFICATIONS ................................................................................. 11
ASSEMBLY ............................................................................................................ 12
OPERATION........................................................................................................... 13-15
APPLICATIONS ..................................................................................... 13
PRE-OPERATION ................................................................................. 13-14
OPERATION .......................................................................................... 14-15
MAINTENANCE AND INSPECTION ..................................................................... 16-17
MAINTENANCE AND INSPECTION ..................................................... 16
SERVICE AND REPAIRS ...................................................................... 17
STANDARD ACCESSORIES ................................................................ 17
NOTES ................................................................................................................... 18-19
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Safety
RECOGNIZE SAFETY INFORMATION
This is the safety alert symbol. When you see this symbol on
your tool or in this manual, be alert to the potential for
personal injury.
Follow recommended precautions and safe operating
practices.
UNDERSTAND SIGNAL WORDS
A "DANGER, WARNING or CAUTION" safety warning will be
surrounded by a "SAFETY ALERT BOX." This box is used to
designate and emphasize Safety Warnings that must be
followed when operating this tool.
Accompanying the Safety Warnings are "signal words" which
designate the degree or level of hazard seriousness. The
"signal words" used in this manual are as follows:
DANGER: Indicates an imminently hazardous situation
which, if not avoided, WILL result in death or
serious injury.
WARNING: Indicates a potentially hazardous situation
which, if not avoided, COULD result in death or
serious injury.
CAUTION: Indicates a potentially hazardous situation
which, if not avoided MAY result in minor or
moderate injury.
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 personal injury.
SAVE THESE INSTRUCTIONS
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WARNING
NEVER TOUCH MOVING PARTS
Never place your hands, fingers or other body parts
near the tool’s moving parts.
NEVER OPERATE WITHOUT ALL GUARDS IN
PLACE
Never operate this tool without all guards or safety
features in place and in proper working order. If
maintenance or servicing requires the removal of a
guard or safety feature, be sure to replace the guard or
safety feature before resuming operation of the tool.
ALWAYS WEAR EYE AND EAR PROTECTION
Protect yourself from flying or expelled wood chips,
metal particles or other debris by using protective
goggles or equivalent eye protector. Wear ear protector
to protect yourself from excessive noise.
PROTECT YOURSELF AGAINST ELECTRIC SHOCK
Prevent body contact with grounded surfaces such as
pipes, radiators, ranges and refrigeration enclosures.
Never operate the tool in damp or wet locations.
DISCONNECT TOOLS
Never leave the tool connected to a power source.
Always disconnect the tool from its power source
before servicing, inspecting, maintaining, cleaning and
before changing or checking any parts.
AVOID UNINTENTIONAL STARTING
Don’t carry the tool while it is connected to its power
source. Don’t carry the tool with your finger near the
power switch. Be sure the power switch is in the “off”
position before connecting the tool to its power source.
CONSIDER WORK AREA ENVIRONMENT
Don’t expose power tools to rain. Don’t use power tools
in damp or wet locations. Keep work area well lit and
well ventilated.
Don’t use tool in presence of flammable liquids or
gases.
Power tools produce sparks during operation. They
also spark when switching ON/OFF. Never use power
tools in sites containing lacquer, paint, benzine,
thinner, gasoline, gases, adhesive agents, and other
materials which are combustible or explosive.
KEEP CHILDREN AWAY
Do not let visitors contact tool or extension cord.
All visitors should be kept safely away from work area.
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WARNING
DRESS PROPERLY
Do not wear loose clothing or jewelry. They can be caught in moving parts.
Rubber gloves and non-skid footwear are recommended when working outdoors.
Wear protective hair covering to contain long hair.
USE FACE, DUST MASK OR RESPIRATOR IF OPERATION IS DUSTY
All persons in the area where power tools are being operated should also wear face,
dust mask or respirator.
SECURE WORK
Use clamps or a vise to hold work. It’s safer than using your hand and it frees both
hands to operate tool.
DON’T OVERREACH
Keep proper footing and balance at all times.
STAY ALERT
Watch what you are doing. Use common sense. Do not operate tool when you are
tired.
Tools should never be used by you if you are under the influence of alcohol, drugs or
medication that makes you drowsy.
HANDLE TOOL CORRECTLY
Operate the tool according to the instructions provided herein. Do not drop or throw
the tool. Never allow the tool to be operated by children, individuals unfamiliar with its
operation or unauthorized personnel.
CHECK FOR LIVE WIRES
Avoid the risk of severe electrical shock by checking for live electrical wires that may
be buried in walls, floors or ceilings. The circuit to the wires should be disconnected
before work begins.
DO NOT USE POWER TOOLS IF THE PLASTIC HOUSING OR HANDLE IS
CRACKED
Cracks in the tool’s housing or handle can lead to electric shock. Such tools should
not be used until repaired.
BLADES AND ACCESSORIES MUST BE SECURELY MOUNTED TO THE TOOL
Prevent potential injuries to youself or others. Blades, cutting implements and
accessories which have been mounted to the tool should be secure and tight.
NEVER LEAVE TOOL RUNNING UNATTENDED
Turn power off. Don’t leave tool until it comes to a complete stop.
6
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CAUTION
STORE TOOL PROPERLY
When not in use, the tool should be stored in a dry place. Keep out of reach of children.
Lock-out the storage area.
KEEP WORK AREA CLEAN
Cluttered areas and benches invite injuries. Clear all work areas and work benches of
unnecessary tools, debris, furniture, etc.
DON’T FORCE TOOL
It will do the job better and safer at the rate for which it was intended.
USE RIGHT TOOL
Don’t force small tool or attachment to do the job of a heavy-duty tool. Don’t use tool for
purpose not intended —for example— don’t use circular saw for cutting tree limbs or logs.
DON’T ABUSE CORD
Never carry tool by cord or yank it to disconnect from receptacle. Keep cord from heat, oil
and sharp edges.
SECURE WORK
Use clamps or a vise to hold work. It's safer than using your hand and it frees both hands
to operate tool.
MAINTAIN TOOLS WITH CARE
Keep tools sharp and clean for better and safer performance. Follow instructions for
lubricating and changing accessories. Inspect tool cords periodically and if damaged,
have repaired by an authorized dealer. Inspect extension cords periodically and replace if
damaged. Keep handles dry, clean, and free from oil and grease.
REMOVE ADJUSTING KEYS AND WRENCHES
Keys and adjusting wrenches remove from tool before turning it on.
OUTDOOR USE EXTENSION CORD
When tool is used outdoors, use only extension cord intended for use outdoors and so
marked.
CHECK DAMAGED PARTS
Before 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 by an
authorized dealer unless otherwise indicated elsewhere in this Instruction Manual. Have
defective switches replaced by the authorized dealer. Do not use tool if switch does not
turn it on and off.
NEVER USE A POWER TOOL FOR APPLICATIONS OTHER THAN THOSE
SPECIFIED
Never use a power tool for applications other than those specified in the Instruction
Manual.
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7
CAUTION
HANDLE TOOL CORRECTLY
Operate the tool according to the instructions provided herein. Do not drop or throw
the tool. Never allow the tool to be operated by children, individuals unfamiliar with its
operation or unauthorized personnel.
KEEP ALL SCREWS, BOLTS AND COVERS TIGHTLY IN PLACE
Keep all screws, bolts, and plates tightly mounted. Check their condition periodically.
KEEP MOTOR AIR VENT CLEAN
The tool’s motor air vent must be kept clean so that air can freely flow at all times.
Check for dust build-up frequently.
OPERATE POWER TOOLS AT THE RATED VOLTAGE
Operate the power tool at voltages specified on its nameplate.
If using the power tool at a higher voltage than the rated voltage, it will result in
abnormally fast motor revolution and may damage the unit and the motor may burn
out.
NEVER USE A TOOL WHICH IS DEFECTIVE OR OPERATING ABNORMALLY
If the tool appears to be operating unusually, making strange noises, or otherwise
appears defective, stop using it immediately and arrange for repairs by a JOHN
DEERE AUTHORIZED DEALER.
CAREFULLY HANDLE POWER TOOLS
Should a power tool be dropped or struck against hard materials inadvertently, it may
be deformed, cracked, or damaged.
DO NOT WIPE PLASTIC PARTS WITH SOLVENT
Solvents such as gasoline, thinner benzine, carbon tetrachloride, and alcohol may
damage and crack plastic parts. Do not wipe them with such solvents.
Wipe plastic parts with a soft cloth lightly dampened with soapy water and dry
thoroughly.
USE ONLY GENUINE JOHN DEERE REPLACEMENT PARTS
Replacement parts not manufactured by JOHN DEERE may void your warranty and
can lead to malfunction and resulting injuries. Genuine JOHN DEERE parts are
available from your dealer.
POLARIZED PLUGS
To reduce the risk of electric shock, this equipment has 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 does not fit, contact a qualified electrician to install the proper outlet.
Do not change the plug in any way.
USE ONLY GRINDING WHEELS HAVING A MAXIMUM OPERATING SPEED AT
LEAST HIGH AS 6600 RPM.
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CAUTION
USE OF EXTENSION CORD
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 shows the correct size to use depending on cord length and
nameplate ampere rating. If in doubt, use the next heavier gage. The smaller the gage
number, the heavier the cord.
MINIMUM GAGE FOR CORD SETS
Total Length of Cord in Feet (Meter)
0 – 25
26 – 50
51 – 100
101 – 150
(0 – 7.6)
(7.9 – 15.2)
(15.5 – 30.5) (30.8 – 45.7)
Ampere Rating
AWG
More
Than
Not More
Than
0 – 6
18
18
16
14
16
16
16
12
16
14
14
14
12
12
6 – 10
10 – 12
12 – 16
Not Recommended
WARNING:
AVOID ELECTRICAL SHOCK HAZARD. NEVER USE THIS
TOOL WITH A DAMAGED OR FRAYED ELECTRICAL CORD
OR EXTENSION CORD.
INSPECT ALL ELECTRICAL CORDS REGULARLY. NEVER
USE IN OR NEAR WATER OR IN ANY ENVIRONMENT WHERE
ELECTRIC SHOCK IS POSSIBLE.
DOUBLE INSULATION FOR SAFER OPERATION
To ensure safer operation of this power tool, JOHN DEERE has adopted a double
insulation design. “Double insulation “ means that two physically separated insulation
systems have been used to insulate the electrically conductive materials connected to
the power supply from the outer frame handled by the operator. Therefore, either the
symbol “ ” or the words “Double insulation” appear on the power tool or on the
nameplate.
Although this system has no external grounding, you must still follow the normal
electrical safety precautions given in this Instruction Manual, including not using the
power tool in wet environments.
To keep the double insulation system effective, follow these precautions:
a. Only a AUTHORIZED JOHN DEERE DEALER should disassemble or
assemble this power tool, and only genuine JOHN DEERE replacement
parts should be installed.
b. Clean the exterior of the power tool only with a soft cloth moistened with
soapy water, and dry thoroughly. Never use solvents, gasoline or thinners
on plastic components; otherwise the plastic may dissolve.
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IMPORTANT
IMPORTANT SAFETY INSTRUCTIONS FOR USE OF THE DISC
GRINDER
WARNING:
DEATH OR SERIOUS BODILY INJURY COULD RESULT FROM
IMPROPER OR UNSAFE USE OF THE DISC GRINDER.
1. NEVER operate the disc grinder without its wheel guard in place.
2. NEVER place hands or body parts near the disc during operation.
3. NEVER use a grinding wheel which is cracked or deformed or worn away.
4. NEVER use a grinding wheel with an RPM rating which is less than
6600 RPM. The wheel can disintegrate during use and cause severe injuries.
5. NEVER use the grinder in places where the sparks generated by the grinder can
cause explosion, such as where flammable materials or gases are present.
6. ALWAYS wear eye protection that meets the requirement of the latest revision of
ANSI Standard Z87.1.
7. ALWAYS wear a mask or respirator to protect yourself from dust or potentially
harmful particles generated during the grinding operation.
8. ALWAYS firmly grip the body handle and side handle while operating the grinder.
9. ALWAYS follow the instructions contained in this manual when replacing the
grinding wheel.
REPLACEMENT PARTS
When servicing use only identical replacement parts.
Repairs should be conducted only by an AUTHORIZED JOHN DEERE DEALER.
SAVE THESE INSTRUCTIONS AND MAKE THEM AVAILABLE TO
OTHER USERS AND OWNERS OF THIS TOOL!
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Functional Description
MODEL:
ET-3302-J 7-INCH DISC GRINDER
NOTE: The information contained in this Instruction Manual is designed to assist
you in the safe operation and maintenance of the power tool.
NEVER operate, or attempt any maintenance on the tool unless you have first read
and understood all safety instructions contained in this manual.
Some illustrations in this Instruction Manual may show details or attachments that
differ from those on your own power tool.
NAME OF PARTS:
(Fig. 1)
SPECIFICATIONS:
7-INCH DISC GRINDER ET-3302-J:
Motor
Single-Phase Series; Wound Commutator Motor
Power Source
Input
Single-Phase 115V AC 60Hz
1, 640W
No-Load Speed (USA)
No-Load Speed (Canada)
6, 000 rpm
8, 500 rpm
Wheel Size
external diam.
internal diam.
7" (180mm)
7/8" (22mm)
Sanding Disc Size
external diam.
internal diam.
7" (180mm)
7/8" (22mm)
Spindle Thread
Weight
5/8"-11UNC
11 lbs. (5.0kg)
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11
Assembly
ASSEMBLY:
WARNING:
BE SURE TO SWITCH POWER OFF AND DISCONNECT THE
PLUG FROM THE RECEPTACLE TO AVOID SERIOUS
TROUBLE.
1. Assembling:
a. Turn the disc grinder upsidedown so that
the spindle is facing upward.
b. To mount the wheel guard on the grinder
first, slip the set ring (A) over the guard
mounting flange, so locating pin fits in the
guard locating groove, then twist guard in
the groove into a proper angle, so the guard
will protect the operator's body from injury
by a broken wheel piece.
c. Tighten the screw in the set ring (A) of guard.
d. To mount a grinding wheel on the grinder,
first align the oval-shaped indentation of the
wheel washer with the notched part of the
spindle, then attach them.
e. Fit the protuberance of the grinding wheel
onto the wheel washer.
(Fig. 2)
f.
Screw the wheel nut onto the spindle.
g. While pushing the lock button with one hand, lock the spindle by turning the
grinding wheel slowly with the other hand.
h. Tighten the wheel nut by using the supplied wrench as shown in Fig. 2.
2. For use as a sander:
a. After placing the Sanding disc on the rubber pad, insert the washer nut
through the spindle.
b. While pushing the lock button with one hand, lock the spindle by turning the
sanding disc slowly with the other hand.
c. Secure the sanding disc and rubber pad by tightening the washer nut with the
wrench.
CAUTION:
MAKE SURE THAT THE GRINDING WHEEL, THE SANDING
DISC OR RUBBER PAD ARE MOUNTED FIRMLY.
3. Disassembling:
To remove the wheel guard, the grinding wheel, the sanding disc, follow the above-
mentioned procedure in reverse order.
12
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Operation
APPLICATIONS:
FOR USE AS A GRINDER:
-Removal of casting fin and finishing of various types of steel, bronze and aluminum
materials and castings.
-Grinding of welded sections or sections cut by means of welding.
-Grinding of synthetic resins, slate, brick, marble, etc.
FOR USE AS A SANDER:
-Preliminary sanding of metal surfaces before painting, rust removal, removing oil paint
before repainting.
-Finishing woodwork, correcting projections of timbers from joints or assemblies.
-Preliminary sanding of wood surfaces before applying paint.
PRE-OPERATION:
1. Power source:
Ensure that the power source to be utilized conforms to the power source
requirements specified on the product nameplate.
2. Power switch:
Ensure that the switch is in the OFF position. If the plug is connected to a
receptacle while the switch is in the ON position, the power tool will start operating
immediately and can cause serious injury.
3. Extension cord:
When the work area is far away from the power source, use an extension cord of
sufficient thickness and rated capacity. The extension cord should be kept as short
as possible.
4. Check the receptacle:
If the receptacle only loosely accepts the plug, the receptacle must be repaired.
Contact a licensed electrician to make appropriate repairs.
If such a faulty receptacle is used, it may cause overheating, resulting in a serious
hazard.
5. Check your working environment:
Ensure the following before operation;
a. No flammable gas, liquid, or object at worksite.
b. Grinding thin steel sheet may cause a high booming sound.
In this case, place a rubber mat under the workpiece.
c. Take appropriate noise preventive measures to prevent adverse affects on the
environment by electrical noise.
d. Clear the area of children or unauthorized personnel.
6. Mounting the wheel guard:
Be sure to mount the wheel guard at an angle that will protect the operator’s body
from injury by a broken wheel piece.
WARNING:
IF NOT CORRECTLY ATTACHING A PROPER WHEEL GUARD,
IT MAY LEAD TO SEVERE INJURY OR DEATH IF THE
GRINDING WHEEL SHOULD BE BROKEN.
7. Inspect the grinding wheel carefully before mounting:
Thoroughly check that a specified grinding wheel free of cracks and splits
is mounted. Make sure that the grinding wheel is firmly clamped and has
been mounted in accordance with the instructions contained on page 12.
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Operation
PRE-OPERATION (CONTINUED):
8. Test the grinder before using:
Before actually beginning the grinding work, test the grinder by first clearing the
area of all other personnel. Make sure the wheel guard is in place and that you are
wearing eye protection. Turn the grinder “on”, and make sure the grinder runs
smoothly and shows no abnormalities.
Duration of the trial run is as follows:
When grinding wheel is replaced
When starting daily work
3 minutes or more
1 minute or more
9. Use only properly rated grinding wheels:
Use only grinding wheels rated at 6600 RPM or more.
Using a grinding wheel rated less can lead to wheel disintegration during operation
and serious bodily injury.
10. Check the spindle lock:
Make sure that the lock button is disengaged by pushing lock button two or three
times before turning on the grinder.
11. Switch Operation:
This enables the grinder always to be controlled with the hand gripping the
machine for maximum safety during grinding operations.
INTERMITTENT USE:
Switch ON:
Press the switch lever
Switch OFF:
Release the switch lever.
CONTINUOUS USE:
Switch ON:
Press the switch lever. The switch is locked by pulling the
lock button.
Switch OFF:
Press and release the switch lever.
OPERATION:
1. Always hold the handle and side handle of the POWER TOOL firmly. Otherwise
the counterforce produced may result in inaccurate and even dangerous
operation.
2. Grinding Pressure:
Since grinding by utiliing only the Disc Grinder's won weight is feasible, hold the
Disc Grinder so that it only slightly contacts the plane to be ground.
CAUTION:
DO NOT PRESS THE DISC GRINDER FORCIBLY AGAINST THE
PLANE TO BE GROUND. HEAVY PRESSURE WILL REDUCE
THE REVOLVING SPEED AND SUCH DETERIORATE THE
FINISHED SURFACE, AND PHENOMENA AS OVERLOAD WILL
LEAD TO BURNING LOSS OF THE MOTOR.
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Operation
OPERATION (CONTINUED):
3. Grinding angle:
Use only its peripheral surface by tilting the grinding
wheel at an angle of 15° - 30°, as shown in Fig. 3-a.
CAUTION:
DO NOT UTILIZE THE ENTIRE
SURFACE OF GRINDING WHEEL
WHEN GRINDING.
4. When using a new grinding wheel in direction A
(Fig. 3-a), the wheel edge may cut into the workplace.
In this case, grind in direction B (Fig. 3-a). Once the
wheel edge is worn, the workpiece can be ground in
both directions.
The provided grinding wheel (resinoid wheel) is rated
as class A grain and #24 grain size. Therefore, it is
most appropriate for heavy grinding of general steel
materials. It is also suitable for grinding other types of
materials. For a fine finish, lift the disc grinder slightly
and grind slowly at the appropriate speed.
(Fig. 3-a)
5. Precaution after use:
Do not lay the grinder down immediately after use in a
place where there are many shavings and much dirt
and dust until it has completely stopped revolving.
FOR USE AS A SANDER:
1. Do not push the sanding disc to the surface to be
ground.
CAUTION:
DO NOT PRESS THE DISC GRINDER
FORCIBLY AGAINST THE PLANE TO
BE GROUND. HEAVY PRESSURE
WILL REDUCE THE REVOLVING
SPEED AND SUCH DETERIORATE
THE FINISHED SURFACE, AND
PHENOMENA AS OVERLOAD WILL
LEAD TO BURNING LOSS OF THE
MOTOR.
2. Sanding angle:
Use only it peripheral surface by tilting the sanding
disc at an angle of 15° -0 30°, as shown in Fig. 3-b.
CAUTION:
DO NOT UTILIZE THE ENTIRE
SURFACE OF SANDING DISC WHEN
SANDING.
(Fig. 3-b)
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15
Maintenance and Inspection
MAINTENANCE AND INSPECTION:
WARNING:
BE SURE TO SWITCH POWER OFF AND DISCONNECT THE
PLUG FROM THE RECEPTACLE DURING MAINTENANCE AND
INSPECTION.
1. Replacing the grinding wheel:
Replace the grinding wheel when it has been worn out to about 2-3/8"
(60mm) in external diameter. Confirm that there is no crack or any damage to the
grinding wheel. If there is a crack or a transformation in the wheel, replace
it immediately.
2. Inspecting the mounting screws:
Regularly inspect all mounting screws and ensure that they are properly tightened.
Should any of the screws be loosened, retighten them immediately.
WARNING:
USING THIS GRINDER WITH LOOSE SCREWS IS EXTREMELY
DANGEROUS.
3. Confirm that there is no damage in the wheel
guard, the cord and the housing, etc.
Furthermore, confirm that there is no abnormality
in the activation of the switch.
4. Inspecting the carbon brushes (Fig. 4):
The motor employs carbon brushes which are
consumable parts. Replace the carbon brush
with a new one when it becomes worn to its
wear limit. Always keep carbon brushes clean
and ensure that they slide freely within the
brush holders.
(Fig. 4)
CAUTION:
USING THIS GRINDER WITH A CARBON BRUSH WHICH IS
WORN IN EXCESS OF THE WEAR LIMIT WILL DAMAGE THE
MOTOR.
NOTE: Use JOHN DEERE carbon brush No. 44 indicated in Fig. 4.
a. Replacing carbon brushes:
Remove the brush caps (Fig. 1) with a slotted screwdriver. The carbon
brushes can then be easily removed.
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Maintenance and Inspection
SERVICE AND REPAIRS:
All quality power tools will eventually require servicing or replacement of parts because
of wear from normal use. To assure that only authorized replacement parts will be used,
all service and repairs must be performed by a JOHN DEERE AUTHORIZED DEALER,
ONLY.
WARNING:
ACCESSORIES FOR THIS POWER TOOL ARE MENTIONED IN
THIS INSTRUCTION MANUAL. THE USE OF ANY OTHER
ATTACHMENT OR ACCESSORY CAN BE DANGEROUS AND
COULD CAUSE INJURY OR MECHANICAL DAMAGE.
STANDARDACCESSORIES:
-Wrench
-Side Handle
1
1
1
-Hexagon Bar Wrench
NOTE: Accessories are subject to change without any obligation on the part of
JOHN DEERE.
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Notes
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Notes
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19
Manufactured for Deere & Company,
#37-0696-090403
©Copyright 2003. John Deere
Moline, Illinois 61265
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110 Code No. C99110961 N
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