Hitachi electric disc grinder User Manual
Model Electronic Disc Grinder
Modèle Meuleuse électronique
Modelo
G 12VA•G 13VA•G 15VA
G13VA
Amoladora angular electrónica
SAFETY INSTRUCTIONS AND INSTRUCTION MANUAL
WARNING
IMPROPER OR UNSAFE use of this power tool can result in death or serious bodily
injury!
This manual contains important information about product safety. Please read and
understand this manual BEFORE operating the power tool. Please keep this manual
available for other users and owners before they use the power tool.
This manual should be stored in safe place
INSTRUCTIONS DE SECURITE ET MODE D’EMPLOI
AVERTISSEMENT
Une utilisation INCORRECTE OU DANGEREUSE de cet outil motorisé peut entraîner la
mort ou de sérieuses blessures corporelles!
Ce mode d’emploi contient d’importantes informations à propos de la sécurité de ce
produit. Prière de lire et de comprendre ce mode d’emploi AVANT d’utiliser l’outil
motorisé. Garder ce mode d’emploi à la disponibilité des autres utilisateurs et propriétaires
avant qu’ils utilisent l’outil motorisé. Ce mode d’emploi doit être conservé dans un
endroit sûr.
INSTRUCCIONES DE SEGURIDAD Y MANUAL DE INSTRUCCIONES
ADVERTENCIA
¡La utilización INAPROPIADA O PELIGROSA de esta herramienta eléctrica puede
resultar en lesiones de gravedad o la muerte!
Este manual contiene información importante sobre la seguridad del producto. Lea y
comprenda este manual ANTES de utilizar la herramienta eléctrica. Guarde este manual
para que puedan leerlo otras personas antes de utilizar la herramienta eléctrica. Este
manual debe ser guardado en un lugar seguro.
DOUBLE INSULATION
DOUBLE ISOLATION
AISLAMIENTO DOBLE
English
CONTENTS
Page
IMPORTANT SAFETY INFORMATION ................ 3
MEANINGS OF SIGNAL WORDS ........................ 3
SAFETY ...................................................................... 3
GENERAL POWER TOOL SAFETY WARNINGS .....
SAFETY WARNINGS COMMON FOR
GRINDING OPERATIONS .............................. 4
KICKBACK AND RELATED WARNINGS .............. 5
SAFETY WARNINGS SPECIFIC FOR
GRINDING OPERATIONS .............................. 5
GENERAL SAFETY INSTRUCTIONS FOR
GRINDERS ...................................................... 6
SPECIFIC SAFETY RULES AND
SYMBOLS ....................................................... 6
DOUBLE INSULATION FOR SAFER
OPERATION ................................................... 7
FUNCTIONAL DESCRIPTION .................................... 9
NAME OF PARTS .................................................. 9
SPECIFICATIONS .................................................. 9
ASSEMBLY AND OPERATION ............................... 10
3
APPLICATIONS ................................................... 10
PRIOR TO OPERATION ....................................... 10
GRINDER OPERATION ....................................... 11
DEPRESSED CENTER WHEEL
ASSEMBLY AND DISASSEMBLY ............... 12
MAINTENANCE AND INSPECTION ....................... 13
ACCESSORIES ......................................................... 14
STANDARD ACCESSORIES ............................... 14
PARTS LIST .............................................................. 43
Page
Français
INFORMATIONS IMPORTANTES DE
SÉCURITÉ ..................................................... 15
SIGNIFICATION DES MOTS
D’AVERTISSEMENT .................................... 15
SECURITE ................................................................ 15
AVERTISSEMENTS DE SÉCURITÉ GÉNÉRAUX
CONCERNANT LES OUTILS ÉLECTRIQUES ......
AVERTISSEMENTS DE SÉCURITÉ COURANTS
AUX OPÉRATIONS DE MEULAGE ............. 17
RECUL DE L'APPAREIL ET AVERTISSEMENTS
ASSOCIÉS .................................................... 17
AVERTISSEMENTS DE SÉCURITÉ SPÉCIFIQUES
AUX OPÉRATIONS DE MEULAGE
CONSIGNES DE SECURITE GENERALES
RELATIVES AUX MEULEUSES DROITES ......
REGLES DE SECURITE SPECIFIQUES
ET SYMBOLES ............................................. 19
DOUBLE ISOLATION POUR UN
FONCTIONNEMENT PLUS SUR ................. 20
TABLE DES MATIERES
................ 18
Español
INFORMACIÓN IMPORTANTE SOBRE
SEGURIDAD ................................................. 29
SIGNIFICADO DE LAS PALABRAS DE
SEÑALIZACIÓN ............................................ 29
SEGURIDAD ............................................................. 29
ADVERTENCIAS DE SEGURIDAD GENERAL
DE LA HERRAMIENTA ELÉCTRICA ............ 29
ADVERTENCIAS COMUNES DE SEGURIDAD
PARA LAS OPERACIONES DE MOLIDO .... 31
REBOTE Y ADVERTENCIAS RELACIONADAS .. 32
ADVERTENCIAS DE SEGURIDAD ESPECÍFICAS
PARA LAS OPERACIONES DE MOLIDO .... 32
INSTRUCCIONES GENERALES DE SEGURIDAD
PARA AMOLADORAS ................................. 32
NORMAS Y SÍMBOLOS ESPECÍFICOS
DE SEGURIDAD ........................................... 33
AISLAMIENTO DOBLE PARA OFRECER UNA
OPERACIÓN MÁS SEGURA ........................ 34
Página
Page
DESCRIPTION FONCTIONNELLE ........................... 22
NOM DES PARTIES ............................................ 22
SPECIFICATIONS ................................................ 22
ASSEMBLAGE ET FONCTIONNEMENT ................ 23
UTILISATIONS .................................................... 23
AVANT L’UTILISATION ...................................... 23
UTILISATION DE LA MEULEUSE À DISQUE .... 24
15
18
ASSEMBLAGE ET DESASSEMBLAGE
DE LA MEULE A DEPRESSION
CENTRALE .................................................... 26
ENTRETIEN ET INSPECTION .................................. 27
ACCESSOIRES ......................................................... 28
ACCESSOIRES STANDARD ............................... 28
LISTE DES PIECES ................................................... 43
ÍNDICE
DESCRIPCIÓN FUNCIONAL .................................... 36
NOMENCLATURA ............................................... 36
ESPECIFICACIONES ............................................ 36
MONTAJE Y OPERACIÓN ...................................... 37
APLICACIONES ................................................... 37
ANTES DE LA OPERACIÓN ................................ 37
OPERACIÓN DE LA AMOLADORA
ANGULAR .................................................... 38
MONTAJE Y DESMONTAJE DE LA
RUEDA DE DISCO ABOMBADO ................. 40
MANTENIMIENTO E INSPECCIÓN ........................ 41
ACCESORIOS ........................................................... 42
ACCESORIOS ESTÁNDAR ................................. 42
LISTA DE PIEZAS .................................................... 43
Page
Página
English
IMPORTANT SAFETY INFORMATION
Read and understand all of the safety precautions, warnings and operating instructions in the Instruction Manual
before operating or maintaining this power tool.
Most accidents that result from power tool operation and maintenance are caused by the failure to observe basic
safety rules or precautions. An accident can often be avoided by recognizing a potentially hazardous situation
before it occurs, and by observing appropriate safety procedures.
Basic safety precautions are outlined in the “SAFETY” section of this Instruction Manual and in the sections which
contain the operation and maintenance instructions.
Hazards that must be avoided to prevent bodily injury or machine damage are identified by WARNINGS on the
power tool and in this Instruction Manual.
NEVER use this power tool in a manner that has not been specifically recommended by HITACHI.
MEANINGS OF SIGNAL WORDS
WARNING indicates a potentially hazardous situations which, if ignored, could result in death or serious injury.
CAUTION indicates a potentially hazardous situations which, if not avoided, may result in minor or moderate
injury, or may cause machine damage.
NOTE emphasizes essential information.
SAFETY
GENERAL POWER TOOL SAFETY WARNINGS
WARNING:
Read all safety warnings and instructions.
Failure to follow the warnings and instructions may result in electric shock, fire and/or serious injury.
Save all warnings and instructions for future reference.
The term “power tool” in the warnings refers to your mains-operated (corded) power tool or battery-operated
(cordless) power tool.
1) Work area safety
a) Keep work area clean and well lit.
Cluttered or dark areas invite accidents.
b) Do not operate power tools in explosive
atmospheres, such as in the presence of
flammable liquids, gases or dust.
Power tools create sparks which may ignite
the dust of fumes.
c) Keep children and bystanders away while
operating a power tool.
Distractions can cause you to lose control.
2) Electrical safety
a) Power tool plugs must match the outlet.
Never modify the plug in any way.
Do not use any adapter plugs with earthed
(grounded) power tools.
Unmodified plugs and matching outlets will
reduce risk of electric shock.
b) Avoid body contact with earthed or grounded
surfaces such as pipes, radiators, ranges and
refrigerators.
There is an increased risk of electric shock if
your body is earthed or grounded.
c) Do not expose power tools to rain or wet
conditions.
Water entering a power tool will increase the
risk of electric shock.
d) Do not abuse the cord. Never use the cord for
carrying, pulling or unplugging the power tool.
Keep cord away from heat, oil, sharp edges
or moving parts.
Damaged or entangled cords increase the risk
of electric shock.
e) When operating a power tool outdoors, use
an extension cord suitable for outdoor use.
Use of a cord suitable for outdoor use reduces
the risk of electric shock.
f) If operating a power tool in a damp location
is unavoidable, use a residual current device
(RCD) protected supply.
Use of an RCD reduces the risk of electric shock.
3) Personal safety
a) 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.
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A moment of inattention while operating
power tools may result in serious personal
injury.
b) Use personal protective equipment. Always
wear eye protection.
Protective equipment such as dust mask, nonskid safety shoes, hard hat, or hearing
protection used for appropriate conditions
will reduce personal injuries.
c) Prevent unintentional starting. Ensure the
switch is in the off-position before connecting
to power source and/or battery pack, picking
up or carrying the tool.
Carrying power tools with your finger on the
switch or energising power tools that have
the switch on invites accidents.
d) Remove any adjusting key or wrench before
turning the power tool on.
A wrench or a key left attached to a rotating
part of the power tool may result in personal
injury.
e) Do not overreach. Keep proper footing and
balance at all times.
This enables better control of the power tool
in unexpected situations.
f) Dress properly. Do not wear loose clothing
or jewellery. Keep your hair, clothing and
gloves away from moving parts.
Loose clothes, jewellery or long hair can be
caught in moving parts.
g) If devices are provided for the connection of
dust extraction and collection facilities,
ensure these are connected and properly
used.
Use of dust collection can reduce dust-related
hazards.
4) Power tool use and care
a) Do not force the power tool. Use the correct
power tool for your application.
The correct power tool will do the job better
and safer at the rate for which it was designed.
b) Do not use the power tool if the switch does
not turn it on and off.
Any power tool that cannot be controlled with
the switch is dangerous and must be repaired.
c) Disconnect the plug from the power source
and/or the battery pack from the power tool
before making any adjustments, changing
accessories, or storing power tools.
Such preventive safety measures reduce the
risk of starting the power tool accidentally.
d) Store idle power tools out of the reach of
children and do not allow persons unfamiliar
with the power tool or these instructions to
operate the power tool.
Power tools are dangerous in the hands of
untrained users.
e) Maintain power tools. Check for
misalignment or binding of moving parts,
breakage of parts and any other condition
that may affect the power tool’s operation.
If damaged, have the power tool repaired
before use.
Many accidents are caused by poorly
maintained power tools.
f) Keep cutting tools sharp and clean.
Properly maintained cutting tools with sharp
cutting edges are less likely to bind and are
easier to control.
g) Use the power tool, accessories and tool bits
etc. in accordance with these instructions,
taking into account the working conditions
and the work to be performed.
Use of the power tool for operations different
from those intended could result in a
hazardous situation.
5) Service
a) Have your power tool serviced by a qualified
repair person using only identical
replacement parts.
This will ensure that the safety of the power
tool is maintained.
SAFETY WARNINGS COMMON FOR
GRINDING OPERATIONS
a) This power tool is intended to function as a grinder.
Read all safety warnings, instructions, illustrations
and specifications provided with this power tool.
Failure to follow all instructions listed below may
result in electric shock, fire and/or serious injury.
b) Operations such as sanding, wire brushing or
polishing or cutting-off are not recommended to be
performed with this power tool.
Operations for which the power tool was not
designed may create a hazard and cause personal
injury.
c) Do not use accessories which are not specifically
designed and recommended by the tool
manufacturer.
Just because the accessory can be attached to your
power tool, it does not assure safe operation.
d) The rated speed of the accessory must be at least
equal to the maximum speed marked on the power
tool.
Accessories running faster than their rated speed
can break and fly apart.
e) The outside diameter and the thickness of your
accessory must be within the capacity rating of your
power tool.
Incorrectly sized accessories cannot be adequately
guarded or controlled.
f) The arbour size of wheels, flanges, backing pads or
any other accessory must properly fit the spindle of
the power tool.
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English
Accessories with arbour holes that do not match the
mounting hardware of the power tool will run out
of balance, vibrate excessively and may cause loss
of control.
g) Do not use a damaged accessory. Before each use
inspect the accessory such as abrasive wheels for
chips and cracks, backing pad for cracks, tear or
excess wear, wire brush for loose or cracked wires.
If power tool or accessory is dropped, inspect for
damage or install an undamaged accessory. After
inspecting and installing an accessory, position
yourself and bystanders away from the plane of the
rotating accessory and run the power tool at
maximum no-load speed for one minute.
Damaged accessories will normally break apart
during this test time.
h) Wear personal protective equipment. Depending on
application, use face shield, safety goggles or safety
glasses. As appropriate, wear dust mask, hearing
protectors, gloves and workshop apron capable of
stopping small abrasive or workpiece fragments.
The eye protection must be capable of stopping
flying debris generated by various operations. The
dust mask or respirator must be capable of filtrating
particles generated by your operation. Prolonged
exposure to high intensity noise may cause hearing
loss.
i) Keep bystanders a safe distance away from work
area. Anyone entering the work area must wear
personal protective equipment.
Fragments of workpiece or of a broken accessory
may fly away and cause injury beyond immediate
area of operation.
j) Hold power tool by insulated gripping surfaces only,
when performing an operation where the cutting
accessory may contact hidden wiring or its own
cord.
Cutting accessory contacting a”live” wire may make
exposed metal parts of the power tool “live” and
shock the operator.
k) Position the cord clear of the spinning accessory.
If you lose control, the cord may be cut or snagged
and your hand or arm may be pulled into the
spinning accessory.
l) Never lay the power tool down until the accessory
has come to a complete stop.
The spinning accessory may grab the surface and
pull the power tool out of your control.
m) Do not run the power tool while carrying it at your
side.
Accidental contact with the spinning accessory could
snag your clothing, pulling the accessory into your
body.
n) Regularly clean the power tool’s air vents.
The motor’s fan will draw the dust inside the housing
and excessive accumulation of powdered metal may
cause electrical hazards.
o) Do not operate the power tool near flammable
materials.
Sparks could ignite these materials.
p) Do not use accessories that require liquid coolants.
Using water or other liquid coolants may result in
electrocution or shock.
KICKBACK AND RELATED WARNINGS
Kickback is a sudden reaction to a pinched or snagged
rotating wheel, backing pad, brush or any other
accessory. Pinching or snagging causes rapid stalling
of the rotating accessory which in turn causes the
uncontrolled power tool to be forced in the direction
opposite of the accessory’s rotation at the point of the
binding.
For example, if an abrasive wheel is snagged or pinched
by the workpiece, the edge of the wheel that is entering
into the pinch point can dig into the surface of the
material causing the wheel to climb out or kick out. The
wheel may either jump toward or away from the
operator, depending on direction of the wheel’s
movement at the point of pinching. Abrasive wheels
may also break under these conditions.
Kickback is the result of power tool misuse and/or
incorrect operating procedures or conditions and can
be avoided by taking proper precautions as given below.
a) Maintain a firm grip on the power tool and position
your body and arm to allow you to resist kickback
forces. Always use auxiliary handle, if provided, for
maximum control over kickback or torque reaction
during start-up.
The operator can control torque reactions or kickback
forces, if proper precautions are taken.
b) Never place your hand near the rotating accessory.
Accessory may kickback over your hand.
c) Do not position your body in the area where power
tool will move if kickback occurs.
Kickback will propel the tool in direction opposite to
the wheel’s movement at the point of snagging.
d) Use special care when working corners, sharp edges
etc. Avoid bouncing and snagging the accessory.
Corners, sharp edges or bouncing have a tendency
to snag the rotating accessory and cause loss of
control or kickback.
e) Do not attach a saw chain woodcarving blade or
toothed saw blade.
Such blades create frequent kickback and loss of
control.
SAFETY WARNINGS SPECIFIC FOR
GRINDING OPERATIONS
a) Use only wheel types that are recommended for
your power tool and the specific guard designed
for the selected wheel.
Wheels for which the power tool was not designed
cannot be adequately guarded and are unsafe.
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b) The guard must be securely attached to the power
tool and positioned for maximum safety, so the least
amount of wheel is exposed towards the operator.
The guard helps to protect operator from broken
wheel fragments and accidental contact with wheel.
c) Wheels must be used only for recommended
applications. For example: do not grind with the side
of cut-off wheel.
Abrasive cut-off wheels are intended for peripheral
grinding, side forces applied to these wheels may
– Ensure that ventilation openings are kept clear when
working in dusty conditions, if it should become
necessary to clear dust, first disconnect the tool from
the mains supply (use non metallic objects) and
avoid damaging internal parts;
– Always use eye and ear protection. Other personal
protective equipment such as dust mask, gloves,
helmet and apron should be worn;
– Pay attention to the wheel that continues to rotate
after the tool is switched off.
cause them to shatter.
d) Always use undamaged wheel flanges that are of
correct size and shape for your selected wheel.
Proper wheel flanges support the wheel thus
reducing the possibility of wheel breakage. Flanges
for cut-off wheels may be different from grinding
wheel flanges.
e) Do not use worn down wheels from larger power
tools.
Wheel intended for larger power tool is not suitable
for the higher speed of a smaller tool and may burst.
GENERAL SAFETY INSTRUCTIONS FOR
GRINDERS
– Check that speed marked on the wheel is equal to
or greater than the rated speed of the grinder;
– Ensure that the wheel dimensions are compatible
SPECIFIC SAFETY RULES AND SYMBOLS
1. ALWAYS use proper guard with grinding wheel.
A guard protects operator from broken wheel
fragments.
2. Accessories must be rated for at least the speed
recommended on the tool warning label. Wheels
and other accessories running over rated speed
can fly apart and cause injury.
3. Hold tools by insulated gripping surfaces when
performing an operation where the cutting tool
may contact hidden wiring or its own cord. Contact
with a “live” wire will make exposed metal parts
of the tool “live” and shock the operator.
4. ALWAYS wear ear protectors when using the tool
for extended periods.
with the grinder;
– Abrasive wheels shall be stored and handled with
care in accordance with manufacturer’s instructions;
– Inspect the grinding wheel before use, do not use
chipped, cracked or otherwise defective products;
– Ensure that mounted wheels and points are fitted in
accordance with the manufacturer’s instructions;
– Ensure that blotters are used when they are provided
with the bonded abrasive product and when they
are required;
– Ensure that the abrasive product is correctly
mounted and tightened before use and run the tool
at no-load for 30 s in a safe position, stop
immediately if there is considerable vibration or if
other defects are detected. If this condition occurs,
check the machine to determine the cause;
5. Use only a depressed center wheel with a rated
capacity which is GREATER than 13,300/min for
G12VA, 12,000/min for G13VA, 10,200/min for
G15VA. Using any wheel a rated capacity LESS
than 13,300/min for G12VA and 12,000/min for
G13VA and 10,200/min for G15VA and/or an
incorrect sized wheel (see SPECIFICATIONS at
page 9) may result in wheel breakage, flying wheel
fragments, and resulting in death or serious injury.
6. NEVER touch moving parts.
– If a guard is equipped with the tool never use the
tool without such a guard;
– Do not use separate reducing bushings or adapters
to adapt large hole abrasive wheels;
– For tools intended to be fitted with threaded hole
wheel, ensure that the thread in the wheel is long
enough to accept the spindle length;
– Check that the work piece is properly supported;
– Do not use cutting off wheel for side grinding;
– Ensure that sparks resulting from use do not create
a hazard e.g. do not hit persons, or ignite flammable
substances;
7. 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.
Prolonged exposure to high intensity
noise can cause hearing loss.
NEVER place your hands, fingers or
other body parts near the tool’s moving
parts.
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English
8. 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.
9. 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.
10. Handle tool correctly.
Operate the tool according to the instructions
provided herein. Do not drop or throw the tool.
Wipe plastic parts with a soft cloth lightly
dampened with soapy water and dry thoroughly.
20. NEVER use a depressed center wheel which is
cracked or deformed or worn away (see the
MAINTENANCE AND INSPECTION section on page
13).
21. 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.
22. NEVER push in the push button while the spindle
is running.
23. ALWAYS wear eye protection that meets the
NEVER allow the tool to be operated by children,
individuals unfamiliar with its operation or
unauthorized personnel.
11. Keep all screws, bolts and covers tightly in place.
Keep all screws, bolts, and plates tightly mounted.
Check their condition periodically.
12. 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.
13. Blades and accessories must be securely mounted
to the tool.
Prevent potential injuries to yourself or others.
Blades, cutting implements and accessories which
have been mounted to the tool should be secure
and tight.
14. 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.
15. 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.
16. 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 Hitachi authorized service center.
17. NEVER leave tool running unattended. Turn power
off.
Don’t leave tool until it comes to a complete stop.
18. Carefully handle power tools.
Should a power tool be dropped or struck against
hard materials inadvertently, it may be deformed,
cracked, or damaged.
19. 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.
24. ALWAYS wear a mask or respirator to protect
yourself from dust or potentially harmful particles
generated during the grinding operation.
25. ALWAYS firmly grip the body handle and side
handle while operating the grinder.
26. ALWAYS have a trial run before grinding
commence. (see Test the grinder before using on
page 12).
27. ALWAYS follow the instructions contained in this
manual when replacing the depressed center
wheel.
28. ALWAYS be careful with buried object such as an
underground wiring.
Touching these active wiring or electric cable with
this tool, you may receive an electric shock.
Confirm if there are any buried object such as
electric cable within the wall, floor or ceiling where
you are going to operate here after.
29. Definitions for symbols used on this tool
V ............... volts
Hz ............. hertz
A ............... amperes
no ............. no load speed
W .............. watt
---/min ...... revolutions per minute
DOUBLE INSULATION FOR SAFER
OPERATION
To ensure safer operation of this power tool, HITACHI
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.
requirement of the latest revision of
ANSI Standard Z87.1.
............. Class II Construction
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English
To keep the double insulation system effective, follow
these precautions:
䡬
Only HITACHI AUTHORIZED SERVICE CENTER
should disassemble or assemble this power tool,
and only genuine HITACHI replacement parts
should be installed.
䡬
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.
SAVE THESE INSTRUCTIONS
AND
MAKE THEM AVAILABLE TO OTHER USERS
AND
OWNERS OF THIS TOOL!
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English
FUNCTIONAL DESCRIPTION
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 safey
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
Push button
Side handle
Gear cover
Depressed
center wheel
Packing gland
SPECIFICATIONS
Model G12VA G13VA G15VA
Motor Single-Phase Series Commutator Motor
Power Source Single-Phase 120 V AC 60 Hz
Current 13.0 A
No-Load Speed 2,800 – 10,500/min 2,300 – 9,000/min
Wheel Size:
external diam.
hole diam.
Weight (only main body) 4.4 lbs (2.0 kg)
Wheel guard
4-1/2" (115 mm) 5" (125 mm) 6" (150 mm)
7/8" (22.23 mm) 7/8" (22.23 mm) 7/8" (22.23 mm)
Fig. 1
Housing
Switch
Dial
Tail cover
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Electronic Control
The grinder has an electronic speed control which
provides:
䡬
full speed at all times in the range up to rated load.
䡬
soft-start.
䡬
variable speed
䡬
Kickback Protection
The kickback protection feature cuts off the power
to the motor and stops the power tool in the event
of a sudden drop in the rotational speed of the
wheel during operation (for example, if the wheel
locks during cutting operation, etc.).
䡬
0 Voltage Re-start Protection
The 0 voltage restart protection feature prevents
the power tool from restarting after the power has
been temporarily cut off during operation.
䡬
Overload Protection
The overload protection feature shuts off the power
to the motor in the event of overloading of the
motor or a conspicuous reduction in rotational
speed during operation.
NOTE:
The grinder is equipped with a rotational speed
control circuit. The rotational speed may fluctuate
slightly due to the conditions of use and working
voltage.
ASSEMBLY AND OPERATION
APPLICATIONS
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Removal of casting fin and finishing of various type
of steel, bronze and aluminum materials and
castings.
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Grinding of welded sections or sections cut by
means of an acetylene torch.
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Grinding of synthetic resins, slate, brick, marble.
WARNING:
To avoid the risk of serious injury, NEVER use this
grinder with cup wheels and/or saw blades.
PRIOR TO OPERATION
1. Power source
Ensure that the power source to be utilized
conforms to the power source requirements
specified on the product nameplate.
NOTE:
When connected to the power supply, the built-in
electronic control circuit shifts to standby status
and the grinder becomes slightly warm, but this is
not a malfunction.
CAUTION
Do not operate from a direct current power source,
engine generator, booster or any other type of
transformer. Doing so may not only cause damage
to the grinder, but may lead to accidents.
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.
When the kickback protection, 0 voltage re-start
protection or overload protection feature has been
activated, return the power switch to the OFF
position and wait for 1 second or more before restarting the power tool.
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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 practicable.
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 work environment
Ensure the following before operation;
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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.
[How to attach and adjust the wheel guard] (Fig. 2)
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WARNING:
Damaged cord must be replaced or
repaired.
No flammable gas, liquid, or object at
worksite.
When grinding thin steel sheet it may cause
a high booming noise.
To avoid such noise, place a rubber mat under
the workpiece.
Clear the area of children or unauthorized
personnel.
Set the wheel ass’y to the packing gland.
Tighten M5 screw to secure the wheel guard
while the lever is in closed position.
Perform the adjustment, of the wheel guard
while the lever is released. (Loosen M5 screw
and readjust if the wheel guard does not
rotate smoothly.)
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After adjustment, if grinder operation is
required, perform the operation only after
setting the lever in closed position.
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Lubricate the sliding section of the set piece
(B) and the lever if the lever does not move
smoothly.
Lever
Set piece (B)
M5 screw
English
10. Check the push button.
Make sure that the push button is disengaged by
pushing push button two or three times before
turning on the grinder. (Fig. 5)
GRINDER OPERATION
1. Hold the grinder firmly by its housing and side
handle (Fig. 1).
The grinder produces a counterforce which must
be controlled by firmly holding onto the grinder.
2. Turn the grinder “on”. (Fig. 3)
While holding the grinder firmly, use one finger to
slide the switch to the “on” position.
Switch
Fig. 2
WARNING:
If the wheel guard is not attached properly, a
broken wheel may result in and cause death or
serious injury.
7. Thoroughly check that the depressed center wheel
is free of cracks, splits and other abnormalities
before mounting. Make sure it is firmly clamped
and has been properly mounted. Refer to page 12
of this manual for Depressed Center Wheel
Assembly and Disassembly
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
3. Adjusting the number of revolution
Above models are equipped with an electronic
infinite-variable-speed drive and can change the
number of revolution according to a use.
If you turn and set the dial scale (Fig. 4) to 6, the
number of revolution increases, and if you turn
and set it to 1, the number of revolution decreases.
Before use, set the number of revolution using the
dial. In so doing, refer to the following table as a
rough guide.
grinder “on”, and make sure the grinder runs
smoothly and shows no abnormalities.
Duration of the trial run is as follows:
When depressed center wheel is replaced
.......................................... 3 minutes or more
When starting daily work
............................................ 1 minute or more
9. Use only properly rated depressed center wheels.
Use only depressed center wheels rated at
13,300/min for G12VA, 12,000/min for G13VA and
10,200/min for G15VA or more.
Using a depressed center wheel rated less can lead
to wheel disintegration during operation and cause
serious bodily injury.
ON
OFF
Fig. 3
Dial Use Tools
1 Polishing, finishing
Removal of paint or
2
coat
Radial grinding
disc
Sanding disc
3 Removal of rust
4 Removal of burrs
Grinding
5
Rough grinding
6 Cutting
Depressed center
wheel
Depressed center
wheel
Diamond wheel
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English
NOTE:
Use caution not to turn the dial scale to any value
below 1 or above 6.
Dial
Fig. 4
CAUTION:
When using the grinder in the immediate vicinity
of welding equipment, the rotational speed may
become unstable. Do not use the grinder near
welding equipment.
4. Use light grinding pressure.
There is no need to press hard when grinding.
Usually the grinder’s own weight is sufficient to
allow the required light contact with the surface to
be ground.
Do not apply the grinding wheel strongly to the
grinding surface. The grinder makes use of
electronic circuit, so during application of load
rotates at high speed, so ample grinding effect can
be obtained by applying light pressure. If a strong
grinding pressure or other abnormal load is
applied, the overload protection circuit will operate
and make the grinder stop rotating, so please stop
applying load immediately. Following this,
switching the power OFF and then ON again, will
cause the rotation to increase to the regular speed.
CAUTION:
When using the tool at any value except the full
speed (Dial scale 6), the motor cannot be
sufficiently cooled due to the decreased number
of revolution. This could result in the risk of
burning and damaging the motor before an
overload protective mechanism starts to function.
Make sure that you use the tool by lightly applying
it to the surface of material when you use it at
any value except the full speed (Dial scale 6).
5. Use proper grinding angle.
Grind only with the wheel’s edge by lifting the
grinder 15° to 30°, as shown in Fig. 5.
CAUTION:
Do not use the entire surface of the depressed
center wheel. Use only the edge of the depressed
center wheel.
6. Move the grinder in the proper direction.
When using a new depressed center wheel in
direction A (Fig. 5), the wheel edge may cut into the
workpiece. In this case, grind in direction B (Fig. 5).
Once the wheel edge is worn, the workpiece can be
ground in both directions.
15° – 30°
AB
Fig. 5
NOTE:
The wheel provided (resinoid wheel) is rated as
Class A grain and # 36 grain size. It is most suitable
for heavy grinding of steel and other types of
materials.
7. Adjust operation to desired finish.
For a fine finish, decrease pressure by lifting
slightly. Grind slowly and at the appropriate speed.
CAUTION:
The revolving depressed center wheel will create
air turbulence.
Do not lay the grinder down in areas of dust or
dirt until it has come to a complete stop.
DEPRESSED CENTER WHEEL ASSEMBLY
AND DISASSEMBLY
WARNING:
Never attempt to assemble or disassemble the
depressed center wheel, unless the power switch
is in the “OFF” position and the electrical cord has
been disconnected from the receptacle.
WARNING:
Do not press the grinder forcibly against the
surface to be ground. Heavy pressure can result
in wheel breakage and serious injury. It can also
damage the surface being ground or damage the
grinder’s motor.
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1. Assembly
(1) Turn the disc grinder upsidedown so that the
spindle is facing upward.
(2) Align the oval-shaped indentation of the wheel
washer with the notched part of the spindle, then
attach them.
(3) Fit the protuberance of the depressed center wheel
onto the wheel washer.
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(4) Screw the wheel nut onto the spindle.
(5) While pushing the push button with one hand, lock
the spindle by turning the depressed center wheel
slowly with the other hand.
Tighten the wheel nut by using the supplied
wrench as shown in Fig. 6.
Wrench
Wheel
nut
Depressed
center
wheel
Wheel
washer
Wheel
guard
Spindle
Tighten
Push button
CAUTION:
Tighten the wheel nut securely and confirm that
the depressed center wheel does not wobble.
2. Disassembly
To remove the depressed center wheel, simply
reverse the above-mentioned procedure.
Fig. 6
MAINTENANCE AND INSPECTION
WARNING:
Be sure to switch power OFF and disconnect the plug from the receptacle during maintenance and inspection.
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Using cracked, deformed or damaged wheels can lead to wheel breakage and resulting serious injury.
1. Replacing the depressed center wheel
Replace the depressed center 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
depressed center wheel. If there is a crack or a
transformation in the wheel, replace it immediately.
2. Inspecting the screws
Regularly inspect all screws and ensure that they
are fully tightened. Should any of the screws be
loosened, retighten them immediately.
WARNING:
Using this grinder with loosened screws is
extremely dangerous.
3. Confirm that there is no damage in the wheel
guard, the electrical cord and the housing, etc.
Check that the on/off switch operates normally.
4. Inspecting the carbon brushes
For your continued safety and electrical shock
protection, carbon brush inspection and
replacement on this tool should ONLY be performed
by a HITACHI AUTHORIZED SERVICE CENTER.
5. Replacing supply cord
If the supply cord of Tool is damaged, the Tool
must be returned to Hitachi Authorized Service
Center for the cord to be replaced.
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English
6. 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 HITACHI
AUTHORIZED SERVICE CENTER, ONLY.
7. Service parts list
CAUTION:
Repair, modification and inspection of Hitachi
●
Power Tools must be carried out by a Hitachi
Authorized Service Center.
This Parts List will be helpful if presented with the
tool to the Hitachi Authorized Service Center when
requesting repair or other maintenance.
In the operation and maintenance of power tools,
the safety regulations and standards prescribed
in each country must be observed.
MODIFICATIONS:
Hitachi Power Tools are constantly being improved
and modified to incorporate the latest
technological advancements.
Accordingly, some parts may be changed without
prior notice.
ACCESSORIES
WARNING:
Never use any accessories other than those mentioned below.
The use of any accessories other than those mentioned below or attachments not intended for use such as
cup wheel, cut-off wheel or saw blade is dangerous and may cause personal injury or property damage.
NOTE:
Accessories are subject to change without any obligation on the part of the HITACHI.
STANDARD ACCESSORIES
Depressed center wheel ......................................................................................................................................... 1
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4-1/2" (115 mm) external dia. × 1/4" (6 mm) thickness × 7/8" (22.23 mm) hole dia.
5" (125 mm) external dia. × 1/4” (6 mm) thickness × 7/8” (22.23 mm) hole dia.
6" (150 mm) external dia. × 1/4” (6 mm) thickness × 7/8” (22.23 mm) hole dia.
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Wrench .................................................................................................................................................................... 1
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Side Handle (Code No. 956633) ............................................................................................................................. 1
(Code No. 701045) ...................................................... G12VA
(Code No. 701050) ...................................................... G13VA
(Code No. 316823) ...................................................... G15VA
(Code No. 938332Z) ...................................... G12VA, G13VA
(Code No. 325491) ...................................................... G15VA
NOTE:
Specifications are subject to change without any obligation on the part of the HITACHI.
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Français
INFORMATIONS IMPORTANTES DE SÉCURITÉ
Lire et comprendre toutes les précautions de sécurité, les avertissements et les instructions de fonctionnement
dans ce mode d’emploi avant d’utiliser ou d’entretenir cet outil motorisé.
La plupart des accidents causés lors de l’utilisation ou de l’entretien de l’outil motorisé proviennent d’un non
respect des règles ou précautions de base de sécurité. Un accident peut la plupart du temps être évité si l’on
reconnaît une situation de danger potentiel avant qu’elle ne se produise, et en observant les procédures de sécurité
appropriées.
Les précautions de base de sécurité sont mises en évidence dans la section “SECURITE” de ce mode d’emploi et
dans les sections qui contiennent les instructions de fonctionnement et d’entretien.
Les dangers qui doivent être évités pour prévenir des blessures corporelles ou un endommagement de la machine
sont identifiés par AVERTISSEMENTS sur l’outil motorisé et dans ce mode d’emploi.
NE JAMAIS utiliser cet outil motorisé d’une manière qui n’est pas spécifiquement recommandée par HITACHI.
SIGNIFICATION DES MOTS D’AVERTISSEMENT
AVERTISSEMENT indique des situations potentiellement dangereuses qui, si elles sont ignorées, pourraient
entraîner la mort ou de sérieuses blessures.
PRECAUTION indique des situations dangereuses potentilles qui, si elles ne sont pas évitées, peuvent entraîner
de mineures et légères blessures ou endommager la machine.
REMARQUE met en relief des informations essentielles.
SECURITE
AVERTISSEMENTS DE SÉCURITÉ GÉNÉRAUX CONCERNANT LES OUTILS ÉLECTRIQUES
AVERTISSEMENT :
Lire tous les avertissements de sécurité et les instructions
Tout manquement à observer ces avertissements et instructions peut engendrer des chocs électriques, des
incendies et/ou des blessures graves.
Conservez tous les avertissements et toutes les instructions pour vous y référer ultérieurement.
Le terme "outil électrique", utilisé dans les avertissements, se réfère aux outils électriques (câblé) ou aux
outils à piles (sans fil).
1) Sécurité de l’aire de travail
a) Maintenir l'aire de travail propre et bien
éclairée.
Les endroits encombrés ou sombres sont
propices aux accidents.
b) Ne pas utiliser d'outils électriques en présence
de liquides, gaz ou poussière inflammables,
au risque de provoquer une explosion.
Les outils électriques créent des étincelles
susceptibles d'enflammer la poussière.
c) Ne pas laisser les enfants et les visiteurs
s'approcher de vous lorsque vous utiliser un
outil électrique.
Les distractions peuvent faire perdre le contrôle.
2) Sécurité électrique
a) Les prises de l'outil électrique doivent
correspondre à la prise secteur.
Ne jamais modifier la prise.
Ne pas utiliser d'adaptateurs avec les outils
électriques mis à la masse.
Les prises non modifiées et les prises secteurs
correspondantes réduisent les risques de
choc électrique.
b) Eviter tout contact avec les surfaces mises à
la masse telles que les tuyaux, radiateurs,
bandes et réfrigérateurs.
Le risque de choc électrique est accru en cas
de mise à la masse du corps.
c) Ne pas exposer les outils électriques à la pluie
ou à des conditions humides.
Si l'eau pénètre dans l'outil, cela augmente
les risques de choc électrique.
d) Ne pas utiliser le cordon à tort. Ne jamais
utiliser le cordon pour transporter ou
débrancher l'outil électrique.
Maintenir le cordon loin de la chaleur, de l'huile,
des bords pointus ou des pièces mobiles.
Les cordons endommagés ou usés
augmentent les risques de choc électrique.
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