Manual Hitachi DH28PC (page 14 of 72) (English, German, Dutch, French, Italian, Portuguese, Spanish)

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English

HOW TO USE THE CORE BIT

(FOR LIGHT LOAD)

When boring penerating large holes use the core bit (for

light loads). At that time use with the center pin and the

core bit shank provided as optional accessories.

1. Mounting

CAUTION

Be sure to turn power OFF and disconnect the plug

from the receptacle.

(1) Mount the core bit to the core bit shank. (Fig. 17).

Lubricate the thread of the core bit shank to facilitate

disassembly.

(2) Mount the core bit to the rotary hammer (Fig. 18).

(3) Insert the center pin into the guide plate until it

stops.

(4) Engage the guide plate with the core bit, and turn

the guide plate to the left or the right so that it

does not fall even if it faced downward. (Fig. 19).

2. How to bore (Fig. 20)

(1) Connect the plug to the power source.

(2) A spring is installed in the center pin.

Push it lightly to the wall or the floor straight.

Connect the core bit tip flush to the surface and

start operating.

(3) When boring about 5 mm in depth the position of

the hole will be established. Bore after that removing

the center pin and the guide plate from core bit.

(4) Application of excessive force will not only expedite

the work, but will deteriorate the tip edge of the

drill bit, resulting in reduced service life of the

rotary hammer.

CAUTION

When removing the center pin and the guide plate,

turn OFF the switch and disconnect the plug from

the receptacle.

3. Dismounting (Fig. 21)

Remove the core bit shank from the rotary hammer

and strike the head of the core bit shank strongly

two or three times with a manual hammer holding

the core bit, then the thread becomes loose and

the core bit can be removed.

GREASE REPLACEMENT

This machine is full air-tight construction to protect

against dust incursion and to prevent lubricant leakage.

This machine can be used without grease replenishment

for an extended period of time. However, perform the

grease replacement to extend the service life. Replace

the grease as described below.

1. Grease Replacement Period

You should look at the grease when you change

the carbon brush. (See item 4 in the section

MAINTENANCE AND INSPECTION.)

Ask for grease replacement at the nearest authorized

Hitachi Service Center.

In the case that you are forced to change the grease

by yourself, please follow the following points.

2. How to replace grease

CAUTION:

Before replacing the grease, turn the power off and

pull out the plug from the receptacle.

(1) Disassemble the crank cover and thoroughly wipe

off the old grease inside. (Fig. 22)

(2) Supply 25g of Hitachi Electric Hammer Grease A

(standard accessory, contained in tube) in the crank

case.

(3) After replacing the grease, reassemble the crank

cover securely. At this time, do not damage or lose

the oil seal.

NOTE:

The Hitachi Electric Hammer Grease A is of the low

viscosity type. When the grease is consumed,

purchase from the authorized Hitachi Service

Center.

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

For your continued safety and electrical shock

protection, carbon brush inspection and replacement

on this tool should ONLY be performed by a HITACHI

AUTHORIZED SERVICE CENTER.

5. Replacing supply cord

If the supply cord of Tool is damaged, the Tool

must be returned to Hitachi Authorized Service

Center for the cord to be replaced.

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.

01e_DH28PC_WE.p65 5/18/11, 9:4913

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Hitachi DH28PC Manual

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