Hitachi Koki DH40FR - 1-9/16 Inch Spline Shank Rotary... User manual

DOUBLE INSULATION
DOUBLE ISOLATION
AISLAMIENTO DOBLE
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.Gardercemoded’emploiàladisponibilitédesautresutilisateursetpropriétaires
avant qu’ils utilisent l’outil motorisé. Ce mode d’emploi doit être conservé dans un
endroit sûr.
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.
INSTRUCCIONES DE SEGURIDAD Y MANUAL DE INSTRUCCIONES
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.
Model Rotary Hammer
Modèle Marteau rotatif
Modelo Martillo perforador
DH 40FR

IMPORTANT SAFETY INFORMATION ................ 3
MEANINGS OF SIGNAL WORDS ........................ 3
SAFETY ...................................................................... 4
GENERAL SAFETY RULES ................................... 4
SPECIFIC SAFETY RULES AND SYMBOLS......... 6
DOUBLE INSULATION FOR SAFER
OPERATION ................................................... 8
FUNCTIONAL DESCRIPTION.................................... 9
NAME OF PARTS .................................................. 9
SPECIFICATIONS .................................................. 9
ASSEMBLY AND OPERATION ............................... 10
APPLICATIONS ................................................... 10
PRIOR TO OPERATION ....................................... 10
HOW TO USE ...................................................... 12
HOW TO USE THE CORE BIT ............................. 14
MAINTENANCE AND INSPECTION ....................... 16
CONTENTS
English Page Page
INFORMATIONS IMPORTANTES DE
SÉCURITÉ ..................................................... 21
SIGNIFICATION DES MOTS
D’AVERTISSEMENT .................................... 21
SECURITE ................................................................ 22
REGLES GENERALE DE SECURITE ................... 22
REGLES DE SECURITE SPECIFIQUES ET
SYMBOLES .................................................. 24
DOUBLE ISOLATION POUR UN
FONCTIONNEMENT PLUS SUR ................. 26
DESCRIPTION FONCTIONNELLE ........................... 27
NOM DES PARTIES ............................................ 27
SPECIFICATIONS ................................................ 27
ASSEMBLAGE ET FONCTIONNEMENT ................ 28
APPLICATIONS ................................................... 28
AVANT L’UTILISATION ...................................... 28
UTILISATION ....................................................... 30
COMMENT UTILISER LA COURONNE .............. 32
ENTRETIEN ET INSPECTION .................................. 34
TABLE DES MATIERES
Français Page Page
INFORMACIÓN IMPORTANTE SOBRE
SEGURIDAD ................................................. 39
SIGNIFICADO DE LAS PALABRAS DE
SEÑALIZACIÓN............................................ 39
SEGURIDAD............................................................. 40
NORMAS GENERALES DE SEGURIDAD........... 40
NORMAS Y SÍMBOLOS ESPECÍFICOS DE
SEGURIDAD ................................................. 42
AISLAMIENTO DOBLE PARA OFRECER
UNA OPERACIÓN MÁS SEGURA .............. 44
DESCRIPCIÓN FUNCIONAL.................................... 45
NOMENCLATURA............................................... 45
ESPECIFICACIONES............................................ 45
MONTAJE Y OPERACIÓN ...................................... 46
APLICACIONES ................................................... 46
ANTES DE LA OPERACIÓN ................................ 46
MODO DE UTILIZACIÓN .................................... 48
MODO DE USAR LA BARRENA TUBULAR ....... 51
MANTENIMIENTO E INSPECCIÓN ........................ 53
ÍNDICE
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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 tires 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.
(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.

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(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 eye protection. Dust mask, non-skid 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 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 from materials likely 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.
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.

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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 live wiring or electric cable with this tool may result in electric shock.
Confirm before use whether hidden objects are present, such as electric cables within
the wall, floor or ceiling.
22. 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
.......... Alternating current

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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:
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
AND
OWNERS OF THIS TOOL!

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Fig. 1
Housing
Stopper
Tool Holder
Switch Trigger
Side Handle
Handle
Nameplate
Tail Cover
Set Screw
(Under the
Tail Cover)
Selector Lever
Brush Cap
(Inside the Tail Cover)
Dial
Motor Single-Phase, Series Commutator Motor.
Power Source Single-Phase, 120 V 60 Hz
Current 9.2 A
Capacity Drill Bit: 1-9/16" (40 mm)
Core Bit: 4-1/8" (105 mm)
No-Load Speed 240 – 480/min
Full-load Blow 1320 – 2650/min
Weight 14.3 lbs (6.5 kg)
Drill Bit
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 safey 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
SPECIFICATIONS

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ASSEMBLY AND OPERATION
APPLICATIONS
Rotation and hammering function
䡬Drilling anchor holes
䡬Drilling holes in concrete
Hammering function only
䡬Crushing concrete, chipping, digging, and squaring
(by applying optional accessories)
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.

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6. How to install dust cover (Fig. 2)
Always install the dust cover on the drill bit or
the taper shank adaptor. Insert the dust cover
until it lies flush in the groove.
NOTE: For a thick drill bit, insert the dust cover
from drill rear.
7. How to install tool
CAUTION:
For tools such as a drill bit and a bull point, use only Hitachi genuine parts.
(1) Clean, then smear the tool shank with the
grease provided in the green tube.
(2) Pull the tool holder in the direction of arrow 1
and rotate it in the direction of arrow 2
(counterclockwise). Fully insert the tool shank
into the hexagonal hole of the front cover. (Fig.
3)
(3) Return the tool holder to fix the tool.
(4) Pull the tool to make sure it is locked
completely.
NOTE: Remove in the reverse order to
installation.
8. Regulating the number of rotations and
hammering (Fig. 4)
This Rotary Hammer is equipped with a built-
in electronic control circuit that can adjust and
regulate the number of rotations and times of
hammering. This Rotary Hammer can be used
by adjusting the dial, depending upon the
contents of operation, such as boring holes into
fragile materials, chipping, centering, etc.
The scale ‘1’ of the dial is designed for a
minimum speed with the number of 240
rotations per minute and 1320 times of blow
per minute. The scale ‘6’ is designed for a
maximum speed with the number of 480
rotations per minute and 2650 times of blow
per minute.
CAUTION:
Do not adjust the dial during operation. Doing so can result in injury because the
Rotary Hammer must be held by only one hand, disabling the steady control of the
Rotary Hammer.
Fig. 3
Tool Holder
Tool Shank
Dial
Fig. 4
Fig. 2
Dust cover Insert up to the
groove
Front Cover
1
2

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Fig. 6
Fig. 5
Fig. 7
Selector Lever
Lever Holder
Button
HOW TO USE
1. How to drill holes (Fig. 5)
(1) Pull the switch trigger after applying the drill
bit tip to the drilling position.
(2) It is unnecessary to forcibly press the Rotary
Hammer main body. It is sufficient to slightly
press the rotary hammer to an extent that clips
are freely discharged.
CAUTION:
Although this machine is equipped with a
safety clutch, if the drill bit becomes bound in
concrete or other material, the resultant
stoppage of the drill bit could cause the
machine body to turn in reaction. Ensure that
the main handle and side handle are gripped
firmly during operation.
2. How to chisel or crush (Fig. 6)
By applying the tool tip to the chiseling or
crushing position, operate the rotary hammer
by utilizing its empty weight. Forcible pressing
or thrusting is unnecessary.
3. When drilling at “rotation + hammering”
CAUTION:
If you switch the selector lever during motor
rotation, the tool can start to rotate abruptly,
resulting in unexpected accidents. Be sure to
switch the selector lever when the motor is at
a complete stop.
(1) Switching to “rotation + hammering”
(a) Push the button, release lock and turn the
selector lever clockwise.
(b) Align of the selector lever and of the
lever holder as illustrated in Fig. 7.
(c) Release the button to lock the selector
lever.
NOTE: Turn the selector lever (do not push the button) to check if it is completely locked
and make sure that it does not turn.

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Lever HolderSelector Lever
Fig. 8
Stopper
Side Handle
Fig. 9
Button
Fig. 10
4. When chipping and shredding at “hammering”:
CAUTION:
䡬If the selector lever is switched during motor rotation, the tool can start to rotate
abruptly, resulting in unexpected accidents. Make sure to switch the selector lever
when the motor is at a complete stop.
(1) Switching to “hammering”
(a) Push the button, release lock and turn the
selector lever counterclockwise.
(b) Align of the selector lever and of the
lever holder as illustrated in Fig. 8.
(c) Release the button to lock the selector
lever.
NOTE: Turn the selector lever (do not push
the button) to check if it is completely
locked and make sure that it does not
turn.
5. Install the stopper (Fig. 9)
(1) Loosen the side handle and insert the straight
portion of the stopper into the handle bolt hole
from the front cover.
(2) Loosen the side handle, move the stopper to
the specified position and rotate the grip of the
side handle clockwise to fix the stopper.
6. Warming up (Fig. 10)
The grease lubrication system in this unit may
require warming up in cold regions.
Position the end of the bit so makes contact
with the concrete, turn on the switch and
perform the warming up operation. Make sure
that a hitting sound is produced and then use
the unit.
CAUTION:
When the warming up operation is performed,
hold the side handle and the main body
securely with both hands to maintain a secure
grip and be careful not to twist your body by
the jammed drill bit.

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Fig. 11
Drill Bit
(Taper shank)
Taper Shank Adaptor
Fig. 14
Taper Shank
Adaptor
Cotter
Support
Fig. 12
Fig. 15
Center Pin
Core Bit Core Bit Tip
Guide Plate
Fig. 13
Core Bit
Core Bit Shank
7. How to use the drill bit (taper shank) and
the taper shank adaptor.
(1) Install drill bit with taper shank in the taper
shank adaptor. (Fig. 11)
(2) Turn the power on and drill a base hole.
(3) After cleaning out dust with a syringe, attach
the plug to the anchor tip and drive in the
anchor with a manual hammer.
(4) To remove the drill bit with taper shank, insert
a cotter into the slot of the taper shank adaptor,
place supports under the Rotary Hammer and
tap the cotter with a manual hammer. (Fig. 12)
HOW TO USE THE CORE BIT
When boring penetrating large hole use the core bit. 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. 13)
Lubricate the thread of the core bit shank to facilitate disassembly.
(2) Mount the core bit shank to the Rotary Hammer. (Fig. 14)
(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 faces downward. (Fig. 15)

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Fig. 16
Core Bit
Shank
Fig. 17
2. How to bore (Fig. 16)
(1) Connect the plug to the receptacle.
(2) A spring is installed in the center pin. Push it
lightly to the wall or the floor straight. 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.
(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. 17)
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.

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Wear limit
No. of carbon brush
0.28" (7 mm)
0.67" (17 mm)
73
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 loose, 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: (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 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.
Fig. 18
NOTE: Use HITACHI carbon brush No.73 indicated in Fig. 18

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Crank Cover
Fig. 19
䡬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.
䡬Grease replacement period
After purchase, replace grease after every 6 months of usage. Ask for grease replacement
at the nearest HITACHI Authorized Service Center. Proceed for replacement of grease.
䡬Grease replenishment
CAUTION:
Before replenishing the grease, turn the power off and pull out the power plug.
(1) Remove the crank cover and wipe off the
grease inside.
(2) Apply 1.0 oz (30 g) of HITACHI Electric Hammer
Grease A (standard accessory, contained in
tube) to the crank case.
(3) After replenishing the grease, install the crank
cover securely.
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.
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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