Manual Hitachi G18SG (page 7 of 53) (English, German, Dutch, French, Italian, Portuguese, Spanish)

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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.

(*Subject to change depending on

area.)

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

When the machine is not in 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.

CAUTIONS

⅜ Comfirm 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 a carbon brush

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.

6. Service parts list

A: Item No.

B: Code No.

C: No. Used

D: Remarks

CAUTION

Repair, modification and inspection of Hitachi Power

Tools must be carried out by an 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.

NOTE

Due to HITACHI’s continuing program of research and

development, the specifications herein are subject to

change without prior notice.

IMPORTANT

Correct connection of the plug

The wires of the main lead are coloured in accordance

with the following code:

Blue: -Neutral

Brown: -Live

As the colours of the wires in the main lead of this tool

may not correspond with the coloured markings

identifying the terminals in your plug proceed as follows:

The wire coloured blue must be connected to the terminal

marked with the letter N or coloured black. The wire

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Hitachi G18SG Manual

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