Manual Hitachi DH24PB-2 (page 13 of 82) (English, German, Dutch, French, Italian, Portuguese, Spanish)

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English

MAINTENANCE AND INSPECTION

1. Inspecting the drill bits

Since use of a dull tool will cause motor

malfunctioning and degraded efficiency, replace the

drill bit with new ones or resharpen them without

delay when abrasion is noted.

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. 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.

4. Inspecting the carbon brushes (Fig. 18)

The motor employs carbon brushes which are

consumable parts. When they become worn to or

near “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 Fig. 18.

In addition, always keep carbon brushes clean and

ensure that they slide freely within the brush holders.

5. Replacing a carbon brush (Fig. 19)

⅜ Disassembling

(1) Loosen the three screws on the handle cover, and

remove the handle cover.

(2) Lift out the brush holder together with the carbon

brush, while being very careful not to forcibly pull

the lead wires within the brush holder.

(3) Withdraw the brush terminal, and remove the carbon

brush from the brush holder.

⅜ Reassembling

(1) Place a new carbon brush into the brush holder, and

connect the brush terminal to the carbon brush.

(2) Return the brush holder and other parts to their

original positions, as illustrated in Fig. 19.

(3) Place the lead wire in the specified position. Be very

careful not to allow the lead wire to contact the

armature or rotating parts of the motor.

(4) Replace the handle cover, while being careful to

ensure it does not pinch the lead wire, and secure it

firmly with the three screws.

CAUTION:

Should the lead wire be pinched by the handle cover

or come in contact with the armature or rotating

parts of the motor, a serious danger of electric shock

to the operator will be created. Excercise extreme

caution in disassembling and reassembling the motor,

following the above procedures exactly.

Do not attempt to disassemble any parts other than

those necessary to effect replacement of the carbon

brush.

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.

MODIFICATION:

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 mains lead are coloured in accordance

with the following code:

Blue: -Neutral

Brown: -Live

As the colours of the wires in the mains 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

coloured brown must be connected to the terminal

marked with the letter L or coloured red. Neither core

must be connected to the earth terminal.

NOTE:

This requirement is provided according to BRITISH

STANDARD 2769: 1984.

Therefore, the letter code and colour code may not be

applicable to other markets except The United Kingdom.

Information concerning airborne noise and vibration

The measured values were determined according to

EN50144.

The typical A-weighted sound pressure level: 90 dB (A).

The typical sound power level: 103 dB (A).

Wear ear protection.

The typical weighted root mean square acceleration

value: 8.0 m/s

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Hitachi DH24PB-2 Manual

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