Hitachi G18SG2, G23SF2, G23SE2, G18SE3, G23U2 User Manual
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Disc Grinder
Model
G 18SE3 • G 18SG2 • G 23SF2
G 23U2 • G 23SE2 • G 23UB2
Handling instructions
G23SE2
NOTE:
Before using this Electric Power Tool, carefully read through these
HANDLING INSTRUCTIONS to ensure efficient, safe operation. It
is recommended that these INSTRUCTIONS be kept readily
available as an important reference when using this power tool.
GENERAL OPERATIONAL PRECAUTIONS
WARNING! When using electric tools, basic safety
precautions should always be followed to reduce the
risk of fire, electric shock and personal injury, including
the following.
Read all these instructions before operating this product
and save these instructions.
For safe operations:
1. Keep work area clean. Cluttered areas and benches
invite injuries.
2. Consider work area environment. Do not expose
power tools to rain. Do not use power tools in damp
or wet locations. Keep work area well lit.
Do not use power tools where there is risk to cause
fire or explosion.
3. Guard against electric shock. Avoid body contact
with earthed or grounded surfaces. (e.g. pipes,
radiators, ranges, refrigerators).
4. Keep children and infirm persons away. Do not let
visitors touch the tool or extension cord. All visitors
should be kept away from work area.
5. Store idle tools. When not in use, tools should be
stored in a dry, high or locked up place, out of reach
of children and infirm persons.
6. Do not force the tool. It will do the job better and
safer at the rate for which it was intended.
7. Use the right tool. Do not force small tools or
attachments to do the job of a heavy duty tool. Do
not use tools for purposes not intended; for example,
do not use circular saw to cut tree limbs or logs.
8. 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 protecting hair covering to
contain long hair.
9. Use eye protection. Also use face or dust mask if the
cutting operation is dusty.
10. Connect dust extraction equipment.
If devices are provided for the connection of dust
extraction and collection facilities ensure these are
connected and properly used.
11. Do not abuse the cord. Never carry the tool by the
cord or yank it to disconnect it from the receptacle.
Keep the cord away from heat, oil and sharp edges.
12. Secure work. Use clamps or a vise to hold the work. It
is safer than using your hand and it frees both hands
to operate tool.
13. Do not overreach. Keep proper footing and balance
at all times.
14. Maintain tools with care. Keep cutting tools sharp
and clean for better and safer performance. Follow
instructions for lubrication and changing accessories.
Inspect tool cords periodically and if damaged, have
it repaired by authorized service center. Inspect
extension cords periodically and replace, if damaged.
Keep handles dry, clean, and free from oil and grease.
15. Disconnect tools. When not in use, before servicing,
and when changing accessories such as blades, bits
and cutters.
16. Remove adjusting keys and wrenches. Form the habit
of checking to see that keys and adjusting wrenches
are removed from the tool before turning it on.
17. Avoid unintentional starting. Do not carry a pluggedin tool with a finger on the switch. Ensure switch is
off when plugging in.
18. Use outdoor extension leads. When tool is used
outdoors, use only extension cords intended for
outdoor use.
19. Stay alert. Watch what you are doing. Use common
sense. Do not operate tool when you are tired.
20. 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, free running 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 service center unless
otherwise indicated in this handling instructions. Have
defective switches replaced by an authorized service
center. Do not use the tool if the switch does not turn
it on and off.
21. Warning
The use of any accessory or attachment, other than
those recommended in this handling instructions,
may present a risk of personal injury.
22. Have your tool repaired by a qualified person.
This electric tool is in accordance with the relevant
safety requirements. Repairs should only be carried
out by qualified persons using original spare parts.
Otherwise this may result in considerable danger to
the user.
PRECAUTIONS ON USING DISC GRINDER
1. Never operate these power tools without Wheel
Guards.
2. Check that speed marked on the wheel is equal to or
greater than the rated speed of the grinder.
Use only depressed center wheels rated at 80m/s or
more.
3. Ensure that the wheel dimensions are compatible
with the grinder and that the wheel fits the spindle.
4. Abrasive wheels shall be stored and handled with
care in accordance with manufacturer’s instructions.
5. Inspect the depressed center wheel before use, do
not use chipped, cracked or otherwise defective
products.
6. Always hold the body handle and side handle of the
power tool firmly. Otherwise the counterforce
produced may result in inaccurate and even
dangerous operation.
7. Do not use cutting-off wheels for side grinding.
8. Do not use of separate reducing bushings or adapters
to adapt large hole abrasive wheels.
9. The wheel continues to rotate after the tool is switched
off.
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SPECIFICATIONS
Model G18SE3 G18SG2 G23SF2 G23U2 G23SE2 G23UB2
Voltage (by areas)*
1
Input*
No-load speed 8500 min
1
(110V, 220V, 230V, 240V)
2300 W 2500 W 2000 W 2400 W, 2500 W
-1
6600 min
-1
Outer dia. 180 mm 230 mm
Wheel Inner dia. 22 mm
Peripheral speed 80 m/s
2
Weight*
Starting current limiter*
*1 Be sure to check the nameplate on product as it is subject to change by areas.
*2 Weight: Only main body
*3 The starting current limiter produces the starting current to such an extent that a fuse (16A, slow-blow) is not
tripped.
3
STANDARD ACCESSORIES
(1) Wrench ........................................................................ 1
(2) Side handle ................................................................ 1
Depressed center wheels are not provided as standard
accessories.
Standard accessories are subject to change without
notice.
APPLICATIONS
䡬 Removal of casting fin and finishing of various types
of steel, bronze and aluminum materials and castings.
䡬 Grinding of welded sections or sections cut by means
of a cutting torch.
䡬 Grinding of synthetic resins, slate, brick, marble, etc.
䡬 Cutting of synthetic concrete, stone, brick, marble
and similar materials.
PRIOR TO OPERATION
1. Power source
Ensure that the power source to be utilized conforms
to the power requirements specified on the product
nameplate.
2. Power switch
Ensure that the power switch is in the OFF position. If
the plug is connected to a receptacle while the power
switch is in the ON position, the power tool will start
operating immediately, which could cause a serious
accident.
3. Extension cord
When the work area is removed 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. Fitting and adjusting the wheel guard
The wheel guard is a protective device to prevent
injury should the depressed center wheel shatter
during operation. Ensure that the guard is properly
fitted and fastened before commencing grinding
operation.
5.0 kg 4.3 kg 5.0 kg
No No Yes No Yes
[Adjusting the wheel guard, For G23SF2, G23U2 only]
䡬 By slightly loosening the setting screw, the wheel
guard can be turned and set at any desired angle for
maximum operational effectiveness.
䡬 Ensure that the setting screw is thoroughly tightened
after adjusting the wheel guard.
[Installing and adjusting the wheel guard, For G18SE3,
G18SG2, G23SE2, G23UB2 only]
䡬 Open the lever and insert the locating pin of wheel
guard, bringing it into line with the across flats of
packing ground.
䡬 Then, turn the wheel guard to a desired position (for
use).
䡬 Close the lever and fix it. If and when required, carry
out adjustments by tightening or loosening the screw.
䡬 If the lever does not move smoothly, apply some
lubricating oil to the sliding section between the set
piece and the lever.
䡬 Fasten the wheel guard at the position where the
across flats of the wheel guard positioning pin and
packing ground are aligned (the position where the
wheel guard is inserted), but do not use it.
Lever
Set piece
Screw
Locating pin
Fig. 1
2
5. Ensure that the depressed center wheel to be utilized
is the correct type and free of cracks or surface defects.
Also ensure that the depressed center wheel is
properly mounted and the wheel nut is securely
tightened, refer to the section on “Depressed Center
Wheel Assembly”.
6. Conducting a trial run
Ensure that the abrasive products is correctly mounted
and tightened before use and run the tool at no-load
for 30 seconds 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.
7. Confirm the spindle lock mechanism
Confirm that the spindle lock is disengaged by pushing
push button two or three times before switching the
power tool on (See Fig. 3).
8. Fixing the side handle
Screw the side handle into the gear cover.
PRACTICAL GRINDER APPLICATION
1. Pressure
To prolong the life of the machine and ensure a first
class finish, it is important that the machine should
not be overloaded by applying too much pressure. In
most applications, the weight of the machine alone is
sufficient for effective grinding. Too much pressure
will result in reduced rotational speed, inferior surface
finish, and overloading which could reduce the life of
the machine.
2. Grinding angle
Do not apply the entire surface of the depressed
center wheel to the material to be ground. As shown
in Fig. 2, the machine should be held at an angle of
15° – 30° so that the external edge of the depressed
center wheel contacts the material at an optimum
angle.
15 – 30°
AB
Fig. 2
3. To prevent a new depressed center wheel from
digging into the workpiece, initial grinding should be
performed by drawing the grinder across the
workpiece toward the operator (Fig. 2 direction B).
Once the leading edge of the depressed center wheel
is properly abraded, grinding may be conducted in
either direction.
4. Switch operation
Switch ON: Push the locking button forward and
then press the switch lever.
* For continuous use, press the switch
lever. The switch lever is locked by
pushing the locking button forward
once again.
(*Subject to change depending on
Switch OFF: Press and release the switch lever.
5. Precautions immediately after finishing operation
After switching off the machine, do not put it down
until the depressed center wheel has come to a
complete stop. Apart from avoiding serious accidents,
this precaution will reduce the amount of dust and
swarf sucked into the machine.
CAUTION:
䡬 Check that the work piece is properly supported.
䡬 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 nonmetallic objects) and avoid damaging internal parts.
䡬 Ensure that sparks resulting from use do not create a
hazard e.g. do not hit persons, or ignite flammable
substances.
䡬 Always use protective safety glasses and hearing
protectors, use other personal protective equipment
such as gloves, apron and helmet when necessary.
䡬 Always use eye and ear protection.
Other personal protective equipment such as dust
mask, gloves, helmet and apron should be worn
when necessary.
If in doubt, wear the protective equipment.
䡬 When the machine is not use, the power source
should be disconnected.
area.)
ASSEMBLING AND DISASSEMBLING THE
DEPRESSED CENTER WHEEL AND OTHER
TOOLS
CAUTION:
Be sure to switch OFF and disconnect the attachment
plug from the receptacle to avoid a serious accident.
1. Assembling (Fig. 3)
(1) Turn the machine upside down so that the spindle is
facing upward.
(2) Mount the wheel washer onto the spindle.
(3) Fit the protruding part of the depressed center wheel
or cutting wheel or diamond wheel onto the wheel
washer.
(4) Screw the wheel nut onto the spindle.
(For diamond wheel assembling, use the wheel nut
with the convex side against the diamond wheel.)
(5) Insert the push button to prevent rotation of the
spindle, and tighten the wheel nut with the accessory
wrench, as shown in Fig. 3.
2. Disassembling
Follow the above procedures in reverse.
CAUTION:
䡬 Comfirm that the depressed center wheel is mounted
firmly.
䡬 Confirm that the push button is disengaged by
pushing push button two or three times before
switching the power tool on.
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