Hitachi Koki DH24PE - 15/16"Sds VSR Rotary Hammer Operator's manual

MODEL Rotary Hammer
MODÈLE Marteau rotatif
MODELO Martillo perforador
DOUBLE INSULATION
DOUBLE ISOLATION
AISLAMIENTO DOBLE
MODE D’EMPLOI ET INSTRUCTIONS DE SECURITE
AVERTISSEMENT
Une utilisation incorrecte et 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 avant qu’ils utilisent
l’outil motorisé.
INSTRUCTION MANUAL AND SAFETY INSTRUCTIONS
WARNING
Improper and 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 others before they use the power tool.
MANUAL DE INSTRUCCIONES E INSTRUCCIONES DE SEGURIDAD
ADVERTENCIA
¡La utilización inapropiada e insegura de esta herramienta eléctrica puede resultar en
lesiones serias o en 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 que utilicen la herramienta eléctrica.
DH 24PE
3 Mode Action

2
CONTENTS
English
Page
MPORTANT INFORMATION ........ 3
MEANINGS OF SIGNAL WORDS .... 3
SAFETY ................................................... 4
GENERAL SAFETY RULES ........... 4
SPECIFIC SAFETY RULES AND
SYMBOLS ...................................... 7
DOUBLE INSULATION FOR SAFER
OPERATION ............................... 8
FUNCTIONAL DESCRIPTION ................ 9
NAME OF PARTS.......................... 9
SPECIFICATIONS .......................... 9
Page
ASSEMBLY AND OPERATION ............ 10
APPLICATIONS............................ 10
PRIOR TO OPERATION ............... 10
HOW TO USE .............................. 12
HOW TO USE THE CORE BIT
(FOR LIGHT LOAD) .................. 16
MAINTENANCE AND INSPECTION .... 18
ACCESSORIES ...................................... 19
STANDARD ACCESSORIES ....... 19
OPTIONAL ACCESSORIES ......... 19
TABLE DES MATIERES
Français
Page
INFORMATIONS IMPORTANTES ... 25
SIGNIFICATION DES MOTS
D’AVERTISSEMENT ................ 25
SECURITE ............................................. 26
REGLES GENERALE DE SECURITE ... 26
REGLES DE SECURITE
SPECIFIQUES ET
SYMBOLES .............................. 29
DOUBLE ISOLATION POUR UN
FONCTIONNEMENT PLUS SUR ... 30
DESCRIPTION FONCTIONNELLE ........ 31
NOM DES PARTIES..................... 31
SPECIFICATIONS ........................ 31
Page
ASSEMBLAGE ET FONCTIONNEMENT .... 32
APPLICATIONS............................ 32
AVANT L’UTILISATION .............. 32
UTILISATION ............................... 34
COMMENT UTILISER LA
COURONNE (POUR UNE
CHARGE LEGERE) ................... 38
ENTRETIEN ET INSPECTION............... 40
ACCESSOIRES...................................... 41
ACCESSOIRES STANDARD ....... 41
ACCESSOIRES SUR OPTION ..... 41
ÍNDICE
Español Página
INFORMACIÓN IMPORTANTE ... 47
SIGNIFICADO DE LAS PALABRAS
DE SEÑALIZACIÓN .................. 47
SEGURIDAD ......................................... 48
NORMAS GENERALES DE
SEGURIDAD ............................. 48
NORMAS Y SÍMBOLOS
ESPECÍFICOS
DE SEGURIDAD ....................... 51
AISLAMIENTO DOBLE PARA
OFRECER UNA OPERACIÓN
MÁS SEGURA .......................... 52
DESCRIPCIÓN FUNCIONAL ................ 53
NOMENCLATURA ...................... 53
Página
ESPECIFICACIONES ................... 53
MONTAJE Y OPERACIÓN ................... 54
APLICACIONES ........................... 54
ANTES DE LA OPERACIÓN ........ 54
COMO SE USA ............................ 56
MODO DE USAR LA BARRENA
TUBULAR (PARA CARGAS
LIGERAS) .................................. 60
MANTENIMIENTO E INSPECCIÓN ..... 62
ACCESORIOS ....................................... 63
ACCESORIOS ESTÁNDAR .......... 63
ACCESORIOS OPCIONALES ...... 63

3
English
IMPORTANT INFORMATION
Read and understand all of the operating instructions, safety precautions and warnings 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, unless you first confirm that the planned use will be safe for you and others.
MEANINGS OF SIGNAL WORDS
WARNING indicates a potentially hazardous situations which, if ignored, could result in
serious personal injury.
CAUTION indicates a hazardous situations which, if ignored, could result in moderate
personal injury, or could cause machine damage.
NOTE emphasizes essential information.

4
English
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 or 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) Don’t 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.
(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.

5
English
(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 grasses. Dust mask, non-skid safety
shoes, hard hat, or ear plugs 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 lose 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 hand 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 tools 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
on another tool.
5. Service
(1) Tool service must be performed only by 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.
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.

6
English
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.
13. Blades and accessories must be securely mounted to the tool.
Prevent potential injuries to yourself 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 gasolie, 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.

7
English
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. Wear ear plugs 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. 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.
Comfirm if there are any buried object such as electric cable within the wall, floor or
ceiling where you are going to operate here after.
7. Definitions for symbols used on this tool
V ... volts
Hz ... hertz
A ... amperes
no... no load speed
W ... watt
... Class II Construction
- - -/min ... revolutions per minute

8
English
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 and “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:
䡬Only HITACHI AUTHORIZED SERVICE CENTER should disassemble or assemble this
power tool, and only genuine HITACHI replacement parts should be installed.
䡬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 OF THIS TOOL!

9
English
Fig. 1
SPECIFICATIONS
Motor Single-Phase, Series Commutator Motor
Power Source Single-Phase, 115V 60Hz
Current 5.7A
Capacity Concrete: 1/8" ~ 15/16" (3.4mm ~ 24mm)
Steel: 1/2" (13mm)
Wood: 1-1/4" (32mm)
No-Load Speed 0 –1350/min.
Full-load Impact Rate 0 –4400/min.
Weight 5.5 lbs (2.5 kg)
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.
Some illustrations in this Instruction Manual may show details or attachments that
differ from those on your own power tool.
NAME OF PARTS
Depth Gauge
Drill Bit Front Cap
Nameplate
Housing
Side Handle
Grip
Push
Button
Change
Lever
Switch
Push Button

10
English
ASSEMBLY AND OPERATION
APPLICATIONS
Rotation and striking function
䡬Drilling anchor holes
䡬Drilling holes in concrete
䡬Drilling holes in tile
Rotation only function
䡬Drilling in steel or wood (with optional accessories)
䡬Tightening machine screws, wood screws (with optional accessories)
Striking only function
䡬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.
5. Confirming condition of the environment
Confirm that the work site is placed under appropriate conditions conforming to
prescribed precautions.

11
English
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.
䡬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.
䡬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:
䡬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.
䡬Insert dust collector (B) completely into the chuck part of the main unit.
䡬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. (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.)
Fig. 2
Dust Cup
Fig. 4
Dust Collector (B)
Fig. 3
Part of SDS-plus
Shank
Front Cap
Grip
Drill Bit

12
English
䡬Dump particles after every two or three holes when drilling.
䡬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. Confirm the direction of bit rotation (Fig. 5)
The bit rotates clockwise (viewed from
the rear side) by pushing the R-side of
the push button. The L-side of the push
button is pushed to turn the bit
counterclockwise.
HOW TO USE
CAUTION:
䡬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.
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. To turn
the switch OFF, release the trigger switch to
its original position.
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. 6)
(1) Mount the drill bit.
(2) Pull the trigger switch after applying the drill
bit tip to the drilling position. (Fig. 7)
(3) Pushing the rotary hammer forcibly is not
necessary at all. Pushing slightly so that drill
dust comes out gradually is just sufficient.
CAUTION:
䡬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. 7.
Change Lever
Push
Button
Fig. 6
Fig. 7
Fig. 5
Push Button

13
English
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. 8)
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. 9)
(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.
CAUTION:
䡬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.
䡬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.
䡬Do not attempt to drill anchor holes or holes in concrete with the main unit in the
rotation only function.
䡬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. 10)
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
5 (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.
Fig. 9
Part of SDS-plus Shank
Front Cap Grip
Drill Chuck
Chuck Adaptor
Fig. 8
Change Lever
Push
Button
Fig. 10
Socket
Bit
Front Cap
Grip
Chuck Adaptor (D)

14
English
CAUTION:
䡬Exercise care not to excessively prolong driving time, otherwise, the screws may be
damaged by excessive force.
䡬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.
䡬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. 10)
(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
䡬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.
䡬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.
CAUTION:
䡬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
This rotary hammer can be set to striking
only mode by pressing the push button
and turning the change lever to mark.
(Fig. 11)
(1) Mount the bull point or cold chisel.
(2) Press the push button and set the change
lever to middle of mark and mark.
(Fig. 12)
Then rotation is released, turn the grip
and adjust the cold chisel to desired
position. (Fig. 13)
(3) Turn the change lever to mark. (Fig. 11)
Then bull point or cold chisel is locked.
Change Lever
Push
Button
Fig. 11
Fig. 12
Push
Button
Change Lever

15
English
7. Using depth gauge (Fig. 14)
(1) Loosen the knob on the side handle, and
insert the depth gauge into the mounting
hole on the side handle.
(2) Adjust the depth gauge position
according to the depth of the hole and
tighten the knob bolt 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. 15)
(2) Mount the drill bit (taper shank) to the
taper shank adaptor. (Fig. 15)
(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. 16)
Grip
Fig. 13
Fig. 15
Drill Bit
Taper Shank
Adaptor Front Cap
Grip
Knob on Side
Handle
Cotter
Rests
Taper Snank Adaptor
Fig. 16
Fig. 14
Mounting
Hole
Depth
Gauge

16
English
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:
䡬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 shank 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 left or 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
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.
Fig. 17
Core Bit
Thread
Core Bit Shank
Fig. 18
Fig. 19
Core Bit
Core BitTip
Guide Plate
Center Pin
Fig. 20

17
English
(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:
䡬When removing the center pin and the guide plate, turn OFF the switch and disconnect
the plug form 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 the manual hammer holding
the core bit, then the thread becomes
loose and the core bit can be removed.
Fig. 21
Core Bit Shank

18
English
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 mounting screws
Regularly inspect all mounting screws and ensure that they are properly tightened.
Should any of the screws be loosened, retighten them immediately.
WARNING: Using this rotary hammer with loosen 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
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. How to replace grease
Low viscosity grease is applied to this rotary hammer so that it can be used for a long
period without replacing the grease. Please contact the nearest authorized service center
for grease replacement when any grease is leaking from a loosened screw. Further use
of the rotary hammer despite the grease shortage causes seizure to reduce the service
life.
CAUTION: A specific grease is used with this machine, therefore, the normal
performance of the machine may be badly affected by use of other grease.
Please be sure to let one of our authorized service center undertaking
replacement of the grease.
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.

19
English
ACCESSORIES
WARNING: Accessories for this power tool are mentioned in this Instruction Manual.
The use of any other attachment or accessory can be dangerous and
could cause injury or mechanical damage.
NOTE:
Accessories are subject to change without any obligation on the part of the HITACHI.
STANDARD ACCESSORIES
(1) Case (Molded plastic) (Code No. 310905)......................................................................... 1
(2) Side Handle (Code No. 303659)......................................................................................... 1
(3) Depth Gauge (Code No. 310331) ....................................................................................... 1
1. Drilling anchor holes (Rotation + Striking)
䡬Drill Bit (Slender shaft)
OPTIONAL ACCESSORIES........ sold separately
(1) Drill Bit (Slender
Shaft)
(2) Adaptor for slender shaft
(SDS-plus shank)
(1) Drill Bit (Slender Shaft) (2) Adaptor for
Slender Shaft
Outer diameter Effective Length Overall Length Code No. Code No.
1/8" 1-25/32" 3-35/64" 306369
(3.4mm) (45mm) (90mm) 306370
9/64" 1-25/32" 3-35/64" 306368
(3.5mm) (45mm) (90mm)
䡬Drill Bit (Taper shank) and taper shank adaptor
(1) Drill Bit (Taper Shank) (2) Taper Shank Adaptor
(SDS-plus shank)
Cotter (Code No. 944477)

20
English
Taper mode Code No. Applicable drill bit
7/16" (11 mm)
31/64" (12.3 mm)
303617 1/2" (12.7 mm)
9/16" (14.3 mm)
73/128" (14.5 mm)
11/16" (17.5 mm)
303618 27/32" (21.5 mm)
A-taper 303619
B-taper 303620
External dia. Code No.
7/16" 944460
(11 mm)
31/64" 944461
(12.3 mm)
1/2" 993038
(12.7 mm)
9/16" 944462
(14.3 mm)
73/128" 944500
(14.5 mm)
11/16" 944463
(17.5 mm)
27/32" 944464
(21.5 mm)
Morse taper
(No. 1)
Drill bit
(Taper
shank)
䡬1/2" (13 mm) Hammer Drill chuck and Chuck wrench
For drilling operations when using a straight shank bit for impact driling with a rotary
hammer
1/2" (13 mm) Hammer Drill
Chuck (SDS-plus shank)
(includes Chuck wrench)
Chuck wrenchName Code No.
1/2" (13 mm) Hammer Drill Chuck 303332
Chuck wrench 303334
Rubber Cap 303335
Impact Drill
Application
Straight shank Bit






Taper shank adaptor formed A-
taper or B-taper is provided as an
optional accessory, but drill bit for
it is not provided.
Morse taper
(No. 2)
Drill bit
(Taper
shank)
Anchor Setter (for anchor setting)
(SDS-plus shank)
2. Knock-in anchor (Striking only)