ModelDisc Grinder
ModèleMeuleuse à disque
ModeloAmoladora angular
G 10SS•G 12SS
G12SS
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.
LISTA DE PIEZAS .................................................... 32
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 SAFETY RULES
WARNING:
Read all instructions
Failure to follow all instructions listed below may result in electric shock, fire and/or serious injury.
The term “power tool” in all of the warnings listed below refers to your mains-operated (corded) power tool
or battery-operated (cordless) power tool.
SAVE THESE INSTRUCTIONS
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.
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.
A moment of inattention while operating
power tools may result in serious personal
injury.
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b)Use safety equipment. Always wear eye
protection.
Safety equipment such as dust mask, nonskid safety shoes, hard hat, or hearing
protection used for appropriate conditions
will reduce personal injuries.
c)Avoid accidental starting. Ensure the switch
is in the off position before plugging in.
Carrying power tools with your finger on the
switch or plugging in 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 these devices 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 tools 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
and in the manner intended for the particular
type of power tool, taking into account the
working conditions and the work to be
performed.
Use of the power tool for operations different
from 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.
–WARNING–
To reduce the risk of injury, user must read
instruction manual.
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.
Prolonged exposure to high intensity
noise can cause hearing loss.
5. Use only a depressed center wheel with a rated
capacity which is GREATER than 13,700/min for
G10SS and 13,300/min for G12SS. Using any
wheel a rated capacity LESS than 13,700/min for
G10SS, 13,300/min for G12SS and/or an incorrect
sized wheel (see SPECIFICATIONS at page 7) may
result in wheel breakage, flying wheel fragments,
and resulting in death or serious injury.
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6. NEVER touch moving parts.
NEVER place your hands, fingers or
other body parts near the tool’s moving
parts.
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.
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.
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.
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.
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
10).
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
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 8).
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
abnormally.
If the tool appears to be operating unusually,
---/min ...... revolutions per minute
making strange noises, or otherwise appears
requirement of the latest revision of
ANSI Standard Z87.1.
............. Class II Construction
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䡬
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.
To keep the double insulation system effective, follow
these precautions:
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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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 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
Switch
Push button
Gear cover
Packing gland
Wheel guard
SPECIFICATIONS
ModelG10SSG12SS
MotorSingle-Phase Series Commutator Motor
Power SourceSingle-Phase 120 V AC 60 Hz
Current5 A
No-Load Speed11,000/min
Wheel Size:
external diam.
hole diam.
Weight3.1 lbs (1.4 kg)
Housing
Tail cover
Brush Cap
Side handle
Fig. 1
4" (100 mm)4-1/2" (115 mm)
5/8" (16 mm)7/8" (22 mm)
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ASSEMBLY AND OPERATION
APPLICATIONS
䡬
Removal of casting fin and finishing of various type
of steel, bronze and aluminum materials and
castings.
䡬
Grinding of welded sections or sections cut by
means of an acetylene torch.
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.
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 practicable.
WARNING:
Damaged cord must be replaced or
repaired.
[Installing Wheel Guard]
䡬
Slightly loosen the screw on the wheel guard.
䡬
Install the wheel guard to the packing gland,
turn it to the angle suitable for operation, and
make adjustment.
䡬
After the adjustment, ensure that the screw
is securely tightened on the wheel guard in
order to fix it completely.
Wheel guard
Packing gland
Fig. 2
WARNING:
If the wheel guard is not attached properly, a
broken wheel may result in and cause death or
serious injury.
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;
䡬
No flammable gas, liquid, or object at
worksite.
䡬
When grinding thin steel sheet it may cause
a high booming noise.
To avoid such noise, place a rubber mat under
the workpiece.
䡬
Clear the area of children or unauthorized
6.Mounting the wheel guard
8
personnel.
Be sure to mount the wheel guard at an angle that
will protect the operator’s body from injury by a
broken wheel piece.
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 9
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
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
English
9.Use only properly rated depressed center wheels.
Use only depressed center wheels rated at
13,700/min for G10SS and 13,000/min for G12SS
or more.
Using a depressed center wheel rated less can lead
to wheel disintegration during operation and cause
5.Move the grinder in the proper direction.
When using a new depressed center wheel in
direction A (Fig. 4), the wheel edge may cut into the
workpiece. In this case, grind in direction B (Fig. 4).
Once the wheel edge is worn, the workpiece can
be ground in both directions.
serious bodily injury.
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
ON
OFF
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.
6.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 no lay the grinder down in areas of dust or dirt
until it has come to a complete stop.
15° – 30°
AB
Fig. 4
Fig. 3
3.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.
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.
4.Use proper grinding angle.
Grind only with the wheel’s edge by lifting the
grinder 15° to 30°, as shown in Fig. 4.
CAUTION:
Do not use the entire surface of the depressed
center wheel. Use only the edge of the depressed
center wheel.
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.
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.
(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. 5.
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Wrench
Depressed
center
wheel
Wheel
washer
Spindle
Fig. 5
Wheel
nut
Wheel
guard
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.
MAINTENANCE AND INSPECTION
WARNING:
Be sure to switch power OFF and disconnect the plug from the receptacle during maintenance and inspection.
䢇
䢇
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 (Fig. 6)
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.
10
CAUTION:
Using this grinder with a carbon brush which is
worn in excess of the wear limit will damage the
motor.
NOTE:
Use HITACHI carbon brush No. 21 indicated in Fig.
6.
䡬
Replacing carbon brushes:
Remove the brush caps (Fig. 1) with a slotted
screwdriver. The carbon brushes can then be easily
removed.
Wear limit
0.67” (17mm)
No. of carbon
brush
21
0.24” (6mm)
Fig. 6
English
5.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.
6.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 (i.e. code numbers and/or
design) 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.