Manual Hitachi G23SU (page 10 of 60) (English, German, Dutch, French, Italian, Portuguese, Spanish)

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9. Caution when using near welding equipment

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.

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.

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.

Switch OFF: Press and release the switch lever.

When the 0 voltage re-start protection feature has

been activated, return the power switch to the OFF

position and wait for 1 second or more before re-

starting the power tool.

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:

⅜ Check that the work piece is properly supported.

⅜ 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.

⅜ Ensure that sparks resulting from use do not create

a hazard e.g. do not hit persons, or ignite flammable

substances.

⅜ 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.

⅜ When the machine is not use, the power source

should be disconnected.

ASSEMBLING AND DISASSEMBLING THE

DEPRESSED CENTER WHEEL

CAUTION:

Be sure to switch OFF and disconnect the attachment

plug from the receptacle to avoid a serious accident.

1. Assembling (Fig. 1)

(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 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. 1.

2. Disassembling

Follow the above procedures in reverse.

CAUTION:

⅜ Confirm that the depressed center wheel is mounted

firmly.

⅜ Confirm that the push button is disengaged by

pushing push button two or three times before

switching the power tool on.

MAINTENANCE AND INSPECTION

1. Inspecting the depressed center wheel

Ensure that the depressed center wheel is free of

cracks and surface defects.

2. Inspecting the mounting screws

Regularly inspect all mounting screws and ensure

that they are properly tightened. Should any of the

screws be loose, retighten them immediately. Failure

to do so could result in serious hazard.

3. Inspecting the carbon brushes (Fig. 3)

The motor employs carbon brushes which are

consumable parts.

When they become worn to or near the “wear

limit”, it could result in motor trouble. When an

auto-stop carbon brush is equipped, the motor will

stop automatically.

At that time, replace both carbon brushes with new

ones which have the same carbon brush numbers

shown in the figure. In addition, always keep carbon

brushes clean and ensure that they slide freely

within the brush holders.

4. Replacing carbon brushes

Disassemble the brush cap with a slotted-head

screwdriver. The carbon brush can then be easily

removed.

5. Maintenance of the motor

The motor unit winding is the very “heart” of the

power tool. Exercise due care to ensure the winding

does not become damaged and/or wet with oil or

water.

01Eng_G23SU_WE 11/22/12, 10:099

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Hitachi G23SU Manual

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