Hitachi DH 30PC, DH 30PB User Manual

MODEL	DH 30PB • DH 30PC			ROTARY HAMMER
MODÈLE				MARTEAU ROTATIF
MODELO				MARTILLO GIRATORIO

SAFETY INSTRUCTIONS AND INSTRUCTION MANUAL

WARNING

IMPROPER OR UNSAFE use of this power tool can result in death or serious bodily injury!

This manual contains important information about product safety. Please read and understand this manual BEFORE operating the power tool. Please keep this manual available for other users and owners before they use the power tool. This manual should be stored in safe place.

INSTRUCTIONS DE SECURITE ET MODE D’EMPLOI

AVERTISSEMENT

Une utilisation INCORRECTE OU DANGEREUSE de cet outil motorisé peut entraîner la mort ou de sérieuses blessures corporelles!

Ce mode d’emploi contient d’importantes informations à propos de la sécurité de ce produit. Prière de lire et de comprendre ce mode d’emploi AVANT d’utiliser l’outil motorisé. Garder ce mode d’emploi à la disponibilité des autres utilisateurs et propriétaires avant qu’ils utilisent l’outil motorisé. Ce mode d’emploi doit être conservé dans un endroit sûr.

INSTRUCCIONESDESEGURIDADYMANUALDEINSTRUCCIONES

ADVERTENCIA

¡La utilización INAPROPIADA O PELIGROSA de esta herramienta eléctrica puede resultar en lesiones de gravedad o la muerte!

Este manual contiene información importante sobre la seguridad del producto. Lea y comprenda este manual ANTES de utilizar la herramienta eléctrica. Guarde este manual para que puedan leerlo otras personas antes de utilizar la herramienta eléctrica. Este manual debe ser guardado en un lugar seguro.

DOUBLE INSULATION

DOUBLE ISOLATION

AISLAMIENTO DOBLE

English

				CONTENTS
English										Page
				Page
IMPORTANT INFORMATION .............					3	ASSEMBLY AND OPERATION ............				10
MEANINGS OF SIGNAL WORDS ......					3	APPLICATIONS .................................				10
SAFETY					4	PRIOR TO OPERATION .....................				10
						HOW TO USE				12
GENERAL SAFETY RULES					4
						HOW TO USE THE CORE BIT (FORLIGHT LOAD)				16
SPECIFIC SAFETY RULES AND SYMBOLS					6
				.....
DOUBLE INSULATION FOR SAFER						MAINTENANCE AND INSPECTION ....				18
OPERATION ...................................					8
FUNCTIONAL DESCRIPTION ................					9
MANE OF PARTS ................................					9
SPECIFICATIONS ................................					9
			TABLE DES MATIERES
Français										Page
				Page
INFORMATIONS IMPORTANTES ....					26	ASSEMBLAGE ET FONCTIONNEMENT ....				34
SIGNIFICATION DES MOTS						APPLICATIONS .................................				34
D’AVERTISSEMENT ....................					26	AVANT L’UTILISATION ....................				34
SECURITE					27	UTILISATION .....................................				37
						COMMENT UTILISER LA COURONNE
REGLES GENERALES DE SECURITE					27
							(POUR UNE CHARGE LEGERE)			41
REGLES DE SECURITE SPECIFIQUES ET SYMBOLES					29
DOUBLE ISOLATION POUR UN						ENTRETIEN ET INSPECTION ...............				43
FONCTIONNEMENT PLUS SUR ......					32
DESCRIPTION FONCTIONNELLE ........					33
NOM DES PARTIES ..........................					33
SPECIFICATIONS ..............................					33
					ÍNDICE
Español									Página
			Página
INFORMACIÓN IMPORTANTE ............					51	MONTAJE Y OPERACIÓN ...................				59
SIGNIFICADO DE LAS PALABRAS DE							APLICACIONES ..............................			59
SEÑALIZACIÓN ..............................					51		ANTES DE LA OPERACIÓN ...........			59
SEGURIDAD					52		COMO SE USA ...............................			61
							MODO DE USAR LA BARRENA TUBULAR
NORMAS GENERALES DE SEGURIDAD					52
							(PARACARGAS LIGERAS)			65
NORMAS Y SÍMBOLOS ESPECÍFICOS DE SEGURIDAD					54
AISLAMIENTO DOBLE PARA OFRECER UNA						MANTENIMIENTO E INSPECCIÓN .....				68
OPERACIÓN MÁS SEGURA					57
DESCRIPCIÓN FUNCIONAL ................					58
NOMENCLATURA .........................					58
ESPECIFICACIONES ......................					58

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IMPORTANT SAFETY INFORMATION

Read and understand all of the safety precautions, warnings and operating instructions in the Instruction Manual before operating or maintaining this power tool.

Most accidents that result from power tool operation and maintenance are caused by the failure to observe basic safety rules or precautions. An accident can often be avoided by recognizing a potentially hazardous situation before it occurs, and by observing appropriate safety procedures.

Basic safety precautions are outlined in the “SAFETY” section of this Instruction Manual and in the sections which contain the operation and maintenance instructions.

Hazards that must be avoided to prevent bodily injury or machine damage are identified by WARNINGS on the power tool and in this Instruction Manual.

NEVER use this power tool in a manner that has not been specifically recommended by HITACHI.

MEANINGS OF SIGNAL WORDS

WARNING indicates a potentially hazardous situations which, if ignored, could result in death or serious injury.

CAUTION indicates a potentially hazardous situations which, if not avoided, may result in minor or moderate injury, or may cause machine damage.

NOTE emphasizes essential information.

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SAFETY

GENERAL SAFETY RULES

WARNING: Read and understand all instructions.

Failure to follow all instructions listed below, may result in electric shock, fire and/or serious personal injury.

SAVE THESE INSTRUCTIONS

1.Work Area

(1)Keep your work area clean and well lit. Cluttered benches and dark areas invite accidents.

(2)Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases, or dust. Power tools create sparks which may ignite the dust of fumes.

(3)Keep bystanders children, and visitors away while operating a power tool.

Distractions can cause you to lose control.

2.Electrical Safety

(1)Double Insulated tools are equipped with a polarized plug (one blade is wider than the other.) This plug will fit in a polarized outlet only one way. If the plug does not fit fully in the outlet, reverse the plug. If it still does not

fit, contact a qualified electrician to install a polarized outlet. Do not change the plug in any way. Double Insulation eliminates the need for the three wire grounded power cord and grounded power supply system.

(2)Avoid body contact with grounded surfaces such as pipes, radiators, ranges and refrigerators. There is an increased risk of electric shock if your body is grounded.

(3)Do not expose power tools to rain or wet conditions. Water entering a power tool will increase the risk of electric shock.

(4)Do not abuse the cord. Never use the cord to carry the tools or pull the plug from a receptacle. Keep cord away from heat, oil, sharp edges or moving parts. Replace damaged cords immediately. Damaged cords increase the risk of electric shock.

(5)When operating a power tool outside, use an outdoor extension cord marked “W-A” or “W”. These cords are rated for outdoor use and reduce the risk of electric shock.

3.Personal Safety

(1)Stay alert, watch what you are doing and use common sense when operating a power tool. Do not use tool while tired or under the influence of drugs, alcohol, or medication. A moment of inattention while operating power tools may result in serious personal injury.

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(2)Dress properly. Do not wear loose clothing or jewelry. Contain long hair. Keep your hair, clothing and gloves away from moving parts. Loose clothes, jewelry, or long hair can be caught in moving parts.

(3)Avoid accidental starting. Be sure switch is off before plugging in. Carrying tools with your finger on the switch or plugging in tools that have the switch on invites accidents.

(4)Remove adjusting keys or wrenches before turning the tool on. A wrench or a key that is left attached to a rotating part of the tool may result in personal injury.

(5)Do not overreach. Keep proper footing and balance at all times. Proper footing and balance enables better control of the tool in unexpected situations.

(6)Use safety equipment. Always wear protective glasses. Dust mask, nonskid safety shoes, hard hat, or hearing protection must be used for appropriate conditions.

4.Tool Use and Care

(1)Use clamps or other practical way to secure and support the workpiece to a stable platform. Holding the work by hand or against your body is unstable and may lead to loss of control.

(2)Do not force tool. Use the correct tool for your application. The correct tool will do the job better and safer at the rate for which it is designed.

(3)Do not use tool if switch does not turn it on or off. Any tool that cannot be controlled with the switch is dangerous and must be repaired.

(4)Disconnect the plug form the power source before making any adjustments, changing accessories, or storing the tool. Such preventive safety measures reduce the risk of starting the tool accidentally.

(5)Store idle tools out of reach of children and other untrained persons. Tools are dangerous in the hands of untrained users.

(6)Maintain tools with care. Keep cutting tools sharp and clean. Properly maintained tools, with sharp cutting edges are less likely to bind and are easier to control.

(7)Check for misalignment or binding of moving parts, breakage of parts, and any other condition that may affect the tool's operation. If damaged, have the tool serviced before using. Many accidents are caused by poorly maintained tools.

(8)Use only accessories that are recommended by the manufacturer for your model. Accessories that may be suitable for one tool, may become hazardous when used with another tool.

5.Service

(1)Tool service must be performed only by a qualified repair personnel. Service or maintenance performed by unqualified personnel could result in a risk of injury.

(2)When servicing a tool, use only identical replacement parts. Follow instructions in the Maintenance section of this manual. Use of unauthorized parts or failure to follow Maintenance Instruction may create a risk of electric shock or injury.

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SPECIFIC SAFETY RULES AND SYMBOLS

1.Hold tools by insulated gripping surfaces when performing an operation where the cutting tool may contact hidden wiring or its own cord. Contact with a “live” wire will make exposed metal parts of the tool “live” and shock the operator.

2.ALWAYS wear ear protectors when using the tool for extended periods.

Prolonged exposure to high intensity noise can cause hearing loss.

3.NEVER touch the tool bit with bare hands after operation.

4.NEVER wear gloves made of stuff liable to roll up such as cotton, wool, cloth or string, etc.

5.ALWAYS attach the side handle and securely grip the Rotary Hammer.

6.NEVER touch moving parts.

NEVER place your hands, fingers or other body parts near the tool’s moving parts.

7.NEVER operate without all guards in place.

NEVER operate this tool without all guards or safety features in place and in proper working order. If maintenance or servicing requires the removal of a guard or safety feature, be sure to replace the guard or safety feature before resuming operation of the tool.

8.Use right tool.

Don’t force small tool or attachment to do the job of a heavy-duty tool.

Don’t use tool for purpose not intended —for example— don’t use circular saw for cutting tree limbs or logs.

9.NEVER use a power tool for applications other than those specified.

NEVER use a power tool for applications other than those specified in the Instruction Manual.

10.Handle tool correctly.

Operate the tool according to the instructions provided herein. Do not drop or throw the tool. NEVER allow the tool to be operated by children, individuals unfamiliar with its operation or unauthorized personnel.

11.Keep all screws, bolts and covers tightly in place.

Keep all screws, bolts, and plates tightly mounted. Check their condition periodically.

12.Do not use power tools if the plastic housing or handle is cracked.

Cracks in the tool’s housing or handle can lead to electric shock. Such tools should not be used until repaired.

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13.Blades and accessories must be securely mounted to the tool.

Prevent potential injuries to youself or others. Blades, cutting implements and accessories which have been mounted to the tool should be secure and tight.

14.Keep motor air vent clean.

The tool’s motor air vent must be kept clean so that air can freely flow at all times. Check for dust build-up frequently.

15.Operate power tools at the rated voltage.

Operate the power tool at voltages specified on its nameplate.

If using the power tool at a higher voltage than the rated voltage, it will result in abnormally fast motor revolution and may damage the unit and the motor may burn out.

16.NEVER use a tool which is defective or operating abnormally.

If the tool appears to be operating unusually, making strange noises, or otherwise appears defective, stop using it immediately and arrange for repairs by a Hitachi authorized service center.

17.NEVER leave tool running unattended. Turn power off.

Don’t leave tool until it comes to a complete stop.

18.Carefully handle power tools.

Should a power tool be dropped or struck against hard materials inadvertently, it may be deformed, cracked, or damaged.

19.Do not wipe plastic parts with solvent.

Solvents such as gasoline, thinner benzine, carbon tetrachloride, and alcohol may damage and crack plastic parts. Do not wipe them with such solvents. Wipe plastic parts with a soft cloth lightly dampened with soapy water and dry thoroughly.

20.ALWAYS wear eye protection that meets the requirement of the latest revision

of ANSI Standard Z87.1.

21.ALWAYS be careful with buried object such as an underground wiring. Touching these active wiring or electric cable with this tool, you may receive an electric shock.

Confirm if there are any buried object such as electric cable within the wall, floor or ceiling where you are going to operate here after.

22.Definitions for symbols used on this tool V ............ volts

Hz .......... hertz

A ............ amperes

no ........... no load speed

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W ...........	watt
...........	Class II Construction

---/min ... revolutions per minute

.......... Alternating current

DOUBLE INSULATION FOR SAFER OPERATION

To ensure safer operation of this power tool, HITACHI has adopted a double insulation design. “Double insulation “ means that two physically separated insulation systems have been used to insulate the electrically conductive materials connected to the power supply from the outer frame handled by the operator. Therefore, either the symbol “” or the words “Double insulation” appear on the power tool or on the nameplate.

Although this system has no external grounding, you must still follow the normal electrical safety precautions given in this Instruction Manual, including not using the power tool in wet environments.

To keep the double insulation system effective, follow these precautions:

Only HITACHI AUTHORIZED SERVICE CENTER should disassemble or assemble this power tool, and only genuine HITACHI replacement parts should be installed.

Clean the exterior of the power tool only with a soft cloth moistened with soapy water, and dry thoroughly.

Never use solvents, gasoline or thinners on plastic components; otherwise the plastic may dissolve.

SAVE THESE INSTRUCTIONS

AND

MAKE THEM AVAILABLE TO

OTHER USERS

AND

OWNERS OF THIS TOOL!

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FUNCTIONAL DESCRIPTION

NOTE:

The information contained in this Instruction Manual is designed to assist you in the safe operation and maintenance of the power tool.

NEVER operate, or attempt any maintenance on the tool unless you have first read and understood all safety instructions contained in this manual.

Some illustrations in this Instruction Manual may show details or attachments that differ from those on your own power tool.

NAME OF PARTS

	Stopper	Change Lever		Nameplate	Trigger
					Handle
Drill Bit	Grip
	Side Handle
	Housing
		Set Screw	Tail Cover Brush Cap
	(Under the Tail Cover)			(Inside the Tail Cover)
		Fig. 1
SPECIFICATIONS
Model		DH30PB			DH30PC
Motor		Single-Phase, Series Commutator Motor
Power Source			Single-Phase, 120V 60Hz
Current				7.4A
Capacity		Concrete: 5/32" – 1-3/16" (4mm – 30mm)
		Steel:		1/2"(13mm)
		Wood:		1-1/4" (32mm)
No-Load Speed				0 – 850/min.
Full-load Impact Rate				0 – 3700/min.
Weight		10.4 lbs (4.7 kg)			10.6 lbs (4.8 kg)

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ASSEMBLY AND OPERATION

APPLICATIONS

Rotation and striking function

Drilling anchor holes

Drilling holes in concrete

Drilling holes in tile Rotation only function

Drilling in steel or wood (with optional accessories).

Tightening machine screws, wood screws (with optional accessories). Striking only function

Light-duty chiselling of concrete, groove digging and edging.

PRIOR TO OPERATION

1.Power source

Ensure that the power source to be utilized conforms to the power source requirements specified on the product nameplate.

2.Power switch

Ensure that the switch is in the OFF position. If the plug is connected to a receptacle while the switch is in the ON position, the power tool will start operating immediately and can cause serious injury.

3.Extension cord

When the work area is far away from the power source, use an extension cord of sufficient thickness and rated capacity. The extension cord should be kept as short as practicable.

WARNING:

Damaged cord must be replaced or repaired.

4.Check the receptacle

If the receptacle only loosely accepts the plug, the receptacle must be repaired. Contact a licensed electrician to make appropriate repairs.

If such a fautly receptacle is used, it may cause overheating, resulting in a serious hazard.

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5.Confirming condition of the environment:

Confirm that the work site is placed under appropriate conditions conforming

to prescribed precautions.

6. Mounting the drill bit (Fig. 2)

(1)To attach a drill bit (SDS-plus shank), fully pull the grip in the direction of the arrow as shown in Fig. 2 and insert the drill bit as far as it will go while manually turning.

(2)By releasing the grip, the drill bit will be secured.

(3)To remove the drill bit, fully pull the grip in the direction of the arrow and pull out the drill bit.

7.Installation of dust cup or dust collector (B) (Optional accessories) (Fig. 3, Fig. 4)

When using a rotary hammer for

upward drilling operations attach a dust cup or dust collector (B) to collect dust or particles for easy operation.

Installing the dust cup

Use the dust cup by attaching to the drill bit a shown in Fig. 3.

When using a bit which has big diameter, enlarge the center hole of the dust cup with this rotary hammer.

Installing dust collector (B)

When using dust collector (B), insert dust collector (B) from the tip of the bit by aligning it to the groove on the grip (Fig. 4)

CAUTION:

Front cap

Part of SDS-plus shank

Grip

Drill bit

Fig. 2

Dust Cup

Fig. 3

Dust Collector (B)

Fig. 4

The dust cup and dust collector (B) are for exclusive use of concrete drilling work. Do not use them for wood or metal drilling work.

Insert dust collector (B) completely into the chuck part of the main unit.

When turning the rotary hammer on while dust collector (B) is detached from a concrete surface, dust collector (B) will rotate together with the drill bit. Make sure to turn on the switch after pressing dust cup on the concrete surface.

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(When using dust collector (B) attached to a drill bit that has more than 7-15/ 32" (190 mm) of overall length, dust collector (B) cannot touch the concrete surface but rotates. Therefore please use dust collector (B) by attaching to drill bits which have 6-17/32" (166 mm), 6-19/64" (160 mm) and 4-21/64" (110 mm) overall length.

Dump particles after every two or three holes when drilling.

Please replace the drill bit after removing dust collector (B).

8.Selecting the driver bit

Screw heads or bits will be damaged should an inappropriate bit for the screw diameter be employed to drive in the screws.

9.Selecting the function mode

You can switch functions to the 3 modes of “strike only, “rotation + strike”, and

“rotation only” by turning the change lever while pressing the push button. Set the mark position of the change lever to that of the mode to be used.

CAUTION:

Before operating the change lever, check and make sure that the motor has stopped.

A failure can occur if it is operated while the motor is running.

If the change lever does not move up to the mark position of each mode, carry out switching while turning the grip end to left and right. Also, it can become difficult to change the mode at low temperature, and therefore perform warming-up.

To operate the change lever, press the push button, and release the lock of the change lever. Also, check and make sure after operation that the push button has returned and that the change lever has been locked.

Switch the change lever without mistake. If it is used at a position halfway, there is a fear that the service life of the switching mechanism may be shortened.

Note that it is impossible to switch from “rotation only” to “strike only” or from “strike only” to “rotation only”. Switch over via “rotation + strike”. (DH30PC)

HOW TO USE

CAUTION:

To prevent accidents, make sure to turn the switch off and disconnect the plug from the receptacle when the drill pits and other various parts are installed or removed. The power switch should also be turned off during a work break and after work.

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1.Switch operation

The rotation speed of the drill bit can be controlled steplessly by varying the amount that the trigger switch is pulled. Speed is low when the trigger switch is pulled slightly and increases as the switch is pulled more.

2.Rotation + Striking

This rotary hammer can be set to

rotation and striking mode by pressing the push button and turning the change lever to mark. (Fig. 5)

(1)Mount the drill bit.

(2)Pull the trigger switch after applying the drill bit tip to the drilling position (Fig. 6)

(3)Pushing the rotary hammer forcibly is not necessary at all. Pushing slightly so that drill dust comes out gradually is just sufficient.

CAUTION:

When the drill bit touches an iron reinforcing rod, the bit will stop immediately and the rotary hammer will react to revolve. Therefore please grip the side handle and handle tightly as shown in Fig. 6.

3.Rotation only

This rotary hammer can be set to rotation only mode by pressing the

push button and turning the change

lever to mark. (Fig. 7)

To drill a wood or metal material using the separately sold drill chuck and chuck adaptor, proceed as follows. Installing drill chuck and chuck adaptor (Fig. 8):

(1)Mount the drill chuck to the chuck adaptor.

(2)The part of the SDS-plus shank is the same as the drill bit. Therefore, refer to the item of “Mounting the drill bit” for attaching it.

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Push

Button

Change

Lever

Fig. 5

Fig. 6

Push Button

Change

Lever

Fig. 7

Front Cap Grip

Drill

Chuck

	Chuck	Part of SDS-plus
	Adaptor
		shank
		Fig. 8

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CAUTION:

Application of force more than necessary will not only reducing drilling efficiency at all, but will deteriorate the tip edge of the drill bit and reduce the service life of the rotary hammer in addition.

Drill bit may snap off while disengaging the rotary hammer from the jammed hole. For disengaging, it is important to use a pushing motion or turn the drill bit counterclockwise.

Do not attempt to drill anchor holes or holes in concrete with the main unit in the rotation only function.

Do not attempt to use the rotary hammer in the rotation and striking function with the drill chuck and chuck adaptor attached. This would seriously shorten the service life of every components of the machine.

4.When driving machine screws (Fig. 9)

First, insert the bit into the socket in the end of chuck adaptor (D).

Next, mount chuck adaptor (D) on the main unit using procedures described in 6 (1), (2), (3), put the tip of the bit in the slots in the head of the screw, grasp the main unit and tighten the screw.

CAUTION:

Exercise care not to excessively prolong driving time, otherwise, the screws may be damaged by excessive force.

Bit

Socket

Chuck
Adaptor (D)	Front Cap
	Grip

Fig. 9

Apply the rotary hammer perpendicularly to the screw head when driving a screw; otherwise, the screw head or bit will be damaged, or driving force will not be fully transferred to the screw.

Do not attempt to use the rotary hammer in the rotation and striking function with chuck adaptor (D) and bit attached.

5. When driving wood screws (Fig. 9)

(1)Selecting a suitable driver bit

Employ phillips screws, if possible, since the driver bit easily slips off the heads of slotted-head screws.

(2)Driving in wood screws

Prior to driving in wood screws, make pilot holes suitable for them in the wooden board. Apply the bit to the screw head grooves and gently drive the screws into the holes.

After rotating the rotary hammer at low speed for a while until a wood screw in partly driven into the wood, squeeze the trigger more strongly to obtain the

optimum driving force.

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CAUTION:

Exercise care in preparing a pilot hole suitable for the wood screw taking the hardness of the wood into consideration. Should the hole be excessively small or shallow, requiring much power to drive the screw into it, the thread of the wood screw may sometimes be damaged.

6.Striking only (DH30PC)

This rotary hammer can be set to striking only mode by pressing the push button and turning the change

lever to mark. (Fig. 10)

(1)Mount the bull point or cold chisel.

(2)Press the push button and set the change lever to mark or mark. Then rotation is released, turn the grip

and adjust the cold chisel to desired position. (Fig. 11)

(3)Turn the change lever to mark. (Fig. 10)

Then bull point or cold chisel is locked.

7. Using the stopper (Fig. 12)

(1)Loosen the side handle, and insert the stopper into the handle bolt hole.

(2)Adjust the stopper position according to the depth of the hole and tighten the side handle securely.

8.How to use the drill bit (taper shank) and the taper shank

adaptor.

(1)Mount the taper shank adaptor to the rotary hammer. (Fig. 13)

(2)Mount the drill bit (taper shank) to the taper shank adaptor. (Fig. 13)

(3)Turn the switch ON, and drill a hole in prescribed depth.

(4)To remove the drill bit (taper shank), insert the cotter into the slot of the taper shank adaptor and strike the head of the cotter with a manual hammer supporting on the rests. (Fig. 14)

Change Lever

Push Button

Fig. 10

Grip

Fig. 11

Handle Bolt

Knob on Side Stopper Handle

Fig. 12

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9.Using the side handle

When you wish to change a position of the side handle, turn grip of the side handle counterclockwise to loosen it, and then fasten it firmly.

CAUTION:

When boring a hole, there can be a case where the machine attempts to rotate by the reaction at the time of penetrating a concrete wall and/or when a tip of the blade comes in contact with the rebar.

Firmly fasten the side handle and hold the machine with both of your hands. Unless you hold it securely, an accident can occur.

Front Cap Grip

Drill Bit

Taper shank

Adaptor

Fig. 13

Cotter

Taper Shank Adaptor

Rests

Fig. 14

HOW TO USE THE CORE BIT (FOR LIGHT LOAD)

When boring penetrating large hole use the core bit (for light load). 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. 15)

Lubricate the thread of the core bit shank to facilitate disassembly.

(2)Mount the core bit shank to the rotary hammer. (Fig. 16)

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

Core Bit

Thread

Core Bit Shank

Fig. 15

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(4)Engage the guide plate with the core bit, and turn the guide plate to left or right so that it does not fall even if it faced downward. (Fig. 17)

Fig. 16

2. How to bore (Fig. 18)

(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 perpendicularly. Connect all over the surface of the core bit tip and start operating.

(3)When boring about 3/16" (5 mm) in depth the position of the hole will establish. Bore after that removing the center pin and the guide plate from core bit.

Guide Plate

Center Pin	Core Bit Tip

Core Bit

Fig. 17

Fig. 18

(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 form the receptacle.

3.Dismounting. (Fig. 19)

Remove the core bit shank from the rotary hammer and strike the head of the core bit shank strongly two or three times with the manual hammer holding the core bit, then the thread becomes loose and the core bit can be removed.

Core Bit shank

Fig. 19

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MAINTENANCE AND INSPECTION

WARNING: Be sure to switch power OFF and disconnect the plug from the receptacle during 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 a new one or resharpening without delay when abrasion is noted.

2.Inspecting the screws

Regularly inspect all screws and ensure that they are properly tightened. Should any of the screws be loosened, retighten them immediately.

WARNING: Using this rotary hammer with loosened screws is extremely dangerous.

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. 20)

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 Nos. shown in the figure.

In addition, always keep carbon brushes clean and ensure that they slide freely within the brush holders.

CAUTION: Using this rotary hammer with a carbon brush which is worn in excess of the wear limit will damage the motor.

Wear limit

No. of carbon brush

73

0.28" (7 mm)

0.67" (17 mm)

Fig. 20

NOTE: Use HITACHI carbon brush No.73 indicated in Fig. 20.

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Replacing carbon brushes: (For parts name, refer to Fig. 1)

Loosen the two set screws and remove the tail cover. Remove the brush caps and carbon brushes. After replacing the carbon brushes, tighten the brush caps

securely and to install the tail cover with securely tightening two set screws.

5.How to replase grease

This machine is full air-tight construction to protect against dust and to prevent

lubricant leakage. Therefore, the machine can be used without lubrication for long periods. Replace the grease as described below.

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 HITACHI Authorized Service Center. Proceed for replacement of grease.

Grease replenishment

CAUTION: Before replenishing the grease, turn the power off and pull out the power plug.

(1)Disassemble the crank cover and thoroughly wipe off the old grease inside. (FIg. 21)

(2)Supply 30g (the standard volume to cover the connecting rod) of Hitachi Electric Hammer Grease A 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 lower viscosity type. When the supplied grease tube is consumed, purchase from a HITACHI Autorized Service Center.

Crank Case Cover

Fig. 21

6.Service and repairs

All quality power tools will eventually require servicing or replacement of parts because of wear from normal use. To assure that only authorized replacement parts will be used, all service and repairs must be performed by a HITACHI AUTHORIZED SERVICE CENTER, ONLY.

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