Hitachi WH 8D2 Operator's manual

INSTRUCTION MANUAL
AND
SAFETY INSTRUCTIONS
FOR
CORDLESS IMPACT WRENCH
WARNING:
Improper and unsafe use of this power tool can result in
death or serious bodily injury!
Thismanualcontainsimportantinformationaboutproduct
safety. Please read and understand this manual before
operatingthepowertool.Pleasekeepthismanualavailable
for others before they use the power tool.
MODEL WH 8D2
!

— CONTENTS —
Page
IMPORTANT INFORMATION.................................................................................... 3
MEANINGS OF SIGNAL WORDS............................................................................. 3
SAFETY
IMPORTANT SAFETY INSTRUCTIONS
FOR USING ALL POWER TOOLS.................................................................... 4
IMPORTANT SAFETY INSTRUCTIONS
FOR USE OF THE CORDLESS IMPACT WRENCH ......................................... 7
IMPORTANT SAFETY INSTRUCTIONS
FOR BATTERY CHARGER................................................................................ 7
IMPORTANT SAFETY INSTRUCTIONS
FOR USE OF THE BATTERY AND BATTERY CHARGER ............................... 9
DISPOSAL OF THE EXHAUSTED BATTERY ....................................................... 10
OPERATION AND MAINTENANCE
MODEL .................................................................................................................. 11
NAME OF PARTS.................................................................................................. 11
SPECIFICATIONS .................................................................................................. 12
ACCESSORIES ...................................................................................................... 13
STANDARD ACCESSORIES ............................................................................ 13
OPTIONAL ACCESSORIES .............................................................................. 13
APPLICATIONS ..................................................................................................... 16
REMOVAL AND INSTALLATION METHOD OF BATTERY ................................. 17
CHARGING METHOD ........................................................................................... 17
PRIOR TO OPERATION......................................................................................... 19
HOW TO USE ........................................................................................................ 20
OPERATIONAL CAUTIONS.................................................................................. 21
MAINTENANCE AND INSPECTION..................................................................... 25
STORAGE .............................................................................................................. 25
SERVICE AND REPAIRS ....................................................................................... 25
PARTS LIST ........................................................................................................... 26

3
IMPORTANT INFORMATION
Read and understand all of the operating instructions, safety precautions and
warningsin theInstructionManualbeforeoperatingormaintainingthispowertool.
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 instruc-
tions.
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.
The warranty of this power tool is separately packed. Before using this power tool,
make sure to thoroughly read and understand the content of the warranty.
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
SAFETY
IMPORTANT SAFETY INSTRUCTIONS
FOR USING ALL POWER TOOLS
WARNING: Death or serious bodily injury could result from improper or
unsafe use of power tools. To avoid these risks, follow these
basic safety instructions:
READ ALL INSTRUCTIONS
1. NEVER TOUCH MOVING PARTS.
Never place your hands, fingers or other body parts near the tool’s moving
parts.
2. 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.
3. ALWAYS WEAR EYE AND EAR PROTECTION.
Protect yourself from flying or expelled wood chips, metal particles or other
debris by using safety goggles or equivalent eye protection. Wear ear protec-
tion to protect yourself from excessive noise.
4. AVOID UNINTENTIONAL STARTING.
Don’t carry the tool with your finger near the power switch.
5. STORE TOOL PROPERLY.
When not in use, the tool should be stored in a dry place. Keep out of reach of
children. Lock-out the storage area.
6. KEEP WORK AREA CLEAN.
Cluttered areas and benches invite injuries.
Clear all work areas and work benches of unnecessary tools, debris, furniture,
etc.
7. CONSIDER WORK AREA ENVIRONMENT.
Don’t expose power tools to rain.
Don’t use power tools in damp or wet locations.
Keep work area well lit and well ventilated.
Don’t use tool in presence of flammable liquids or gases.
Power tools produce sparks during operation. They also spark when
switchingON/OFF.Neverusepowertoolsinsitescontaininglacquer,paint,
benzine, thinner, gasoline, gases, adhesive agents, and other materials
which are combustible or explosive.
!

5
8. KEEP CHILDREN AWAY.
Do not let visitors contact tool.
All visitors should be kept safely away from work area.
9. DON’T FORCE TOOL.
It will do the job better and safer at the rate for which it was intended.
10. USE RIGHT TOOL.
Don’t force small tool or attachment to do the job of a heavy-duty tool.
Don’tusetoolforpurposenotintended-forexample-don’tusecircularsawfor
cutting tree limbs or logs.
11. DRESS PROPERLY.
Do not wear loose clothing or jewelry.
Theycanbecaughtinmovingparts.Rubberglovesandnon-skidfootwearare
recommended when working outdoors.
Wear protective hair covering to contain long hair.
12. USE FACE OR DUST MAKE IF OPERATION IS DUSTY.
13. SECURE WORK.
Use clamps or a vise to hold work. It’s safer than using your hand and it frees
both hands to operate tool.
14. DON’T OVERREACH.
Keep proper footing and balance at all times.
15. MAINTAIN TOOLS WITH CARE.
Keep tools sharp and clean for better and safer performance.
Follow instructions for lubricating and changing accessories.
Keep handles dry, clean, and free from oil and grease.
16. REMOVE ADJUSTING KEYS AND WRENCHES.
Keys and adjusting wrenches remove from tool before turning it on.
17. STAY ALERT.
Watchwhatyouaredoing.Usecommonsense.Donot operate tool when you
are tired.
Tools should never be used by you if you are under the influence of alcohol,
drugs or medication that makes you drowsy.
18. CHECK DAMAGED PARTS.
Before further use of the tool, a guard or other part that is damaged should be
carefully checked to determine that it will operate properly and perform its
intended function. Check for alignment of moving parts, binding of moving
parts, breakage of parts, mounting, and any other conditions that may affect
its operation. A guard or other part that is damaged should be properly
repaired or replaced by an authorized service center unless otherwise indi-
cated elsewhere in this Instruction Manual.
Have defective switches replaced by authorized service center.
Do not use tool if switch does not turn it on and off.

6
19. 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.
20. 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.
21. CHECK FOR LIVE WIRES.
Avoidtheriskofsevereelectricalshockbycheckingforliveelectricalwiresthat
may be hidden by walls, floors or ceilings. The wires should be de-energized
before work begins.
22. KEEP ALL SCREWS, BOLTS AND COVERS TIGHTLY IN PLACE.
Keep all screws, bolts, and plates tightly mounted. Check their condition
periodically.
23. DO NOT USE POWER TOOLS IF THE PLASTIC HOUSING OR HANDLE ARE
CRACKED.
Cracks in the tool’s housing or handle can lead to electric shock.
Such tools should not be used until repaired.
24. BLADES AND ACCESSORIES MUST BE SECURELY MOUNTED TO THE TOOL
Preventpotentialinjuriestoyourselforothers.Blades,cuttingimplementsand
accessories which have been mounted to the tool should be secure and tight.
25. NEVER USE A TOOL WHICH IS DEFECTIVE OR OPERATING ABNORMALLY.
If the tool appears to be operating unusually, making strange noises, or
otherwiseappearsdefective,stopusingitimmediatelyandarrangeforrepairs
by an authorized Hitachi service center.
26. CAREFULLY HANDLE POWER TOOLS.
Shouldapowertoolbedroppedorstruckagainsthardmaterialsinadvertently
it may be deformed, cracked, or damaged.
27. DO NOT WIPE PLASTIC PARTS WITH SOLVENT.
Solventssuch as gasoline,thinner, benzine, carbontetrachloride, 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.
28. USE ONLY AUTHENTIC HITACHI REPLACEMENT PARTS.
Replacement parts not manufactured by Hitachi may void your warranty and
can lead to malfunction and resulting injuries. Authentic Hitachi parts are
available from your dealer.

7
IMPORTANT SAFETY INSTRUCTIONS
FOR USE OF THE CORDLESS IMPACT WRENCH
WARNING: Death or serious bodily injury could result from improper or
unsafe use of the cordless impact wrench. To avoid these
risks, follow these basic safety instructions:
1. Neverusethis driverhandle for anyapplication otherthan thosein this manual.
2. Whenworkinginhighplaces,alwaysmakesurethatthereisnoonebelowbefore
starting to work.
3. Always wear eye and ear protection when you work.
4. Confirm whether the socket has any crack in it.
5. Attach the hex. socket securely onto the anvil. If the hex. soket is insufficiently
secured,itmaydropoutandcauseanaccident.Forhex.socketattachmentrefer
to ''PRIOR TO OPERATION'' on page 19.
6. Confirmthetighteningtorquebyatorquewrenckbeforeuseinorder toascertain
the correct tightening torque to be used.
7. If a universal joint is used, be sure not to operate the unit in a no-load condition.
Operating in this condition is dangerous. When the socket section spins around
it may cause injury to hands or bodies, or the resuluting intense vibration may
cause the user to drop the tool.
8. Becarefulthatforeignmattersdonotblocktheholeslocatedonbothsidesofthe
handle. Also do not close the holes with a tape. The holes act an important role.
IMPORTANT SAFETY INSTRUC-
TIONS FOR BATTERY CHARGER
1. This manual contains important safety and operating instructions for battery
charger Model UC 12Y.
2. Before using battery charger, read all instructions and cautionary markings on
(1) battery charger, (2) battery, and (3) product using battery.
3. To reduce risk of injury, charge HITACHI rechargeable batteries type EB7, EB9,
EB12, EB2, B-2, B-3 or B-4. Other type of batteries may burst causing personal
injury and damage.
4. Do not expose battery charger to rain or snow.
5. Useofanattachmentnotrecommendedorsoldbythebatterychargermanufac-
turer may result in a risk of fire, electric shock, or injury to persons.
6. Toreduceriskofdamagetoelectricplugandcord,pullbyplugwhendisconnect-
ing battery charger.
7. Make sure cord is located so that it will not be stepped on, tripped over, or
otherwise subjected to damage or stress.
!

8
8. An extension cord should not be used unless absolutely necessary. Use of
improper extension cord could result in a risk of fire and electric shock.
If extension cord must be used make sure:
a. That blades of extension cord are the same number, size, and shape as
those of plug on battery charger:
b. Thatextensioncordisproperlywiredandingoodelectricalcondition;and
c. That wire size is large enough for AC ampere rating of battery charger as
specified in Table 1.
Table 1
RECOMMENDED MINIMUM AWG SIZE FOR
EXTENSION CORDS FOR BATTERY CHARGERS
AC Input Rating Amperes* AWG Size of Cord
Equal to or but less Length of Cord, Feet (Meter)
greater than than 25 (7.5) 50 (15) 100 (30) 150 (45)
0 2 18 18 18 16
2 3 18 18 16 14
3 4 18 18 16 14
* If the input rating of a battery charger is given in watts rather than in amperes,
the corresponding ampere rating is to be determined by dividing the wattage
rating by the voltage rating-for example:
9. Do not operate battery charger with damaged cord or plug-replace them
immediately.
10. Do not operate battery charger if it has received a sharp blow, been dropped,
or otherwise damaged in any way; take it to a qualified serviceman.
11. Do not disassemble battery charger; take it to a qualified serviceman when
serviceorrepairisrequired.Incorrectreassemblymayresultinariskofelectric
shock or fire.
12. To reduce risk of electric shock, unplug charger from receptacle before
attemptinganymaintenanceorcleaning.Removingthebatterywillnotreduce
this risk.
1250watts
125 volts = 10 amperes

9
IMPORTANT SAFETY INSTRUCTIONS FOR USE OF THE
BAT TERY AND BATTERY CHARGER
Youmustchargethebatterybeforeyoucanusethecordlessimpact wrench. Before
using the model UC12Y battery charger, be sure to read all instructions and
cautionary statements on it, the battery and in this manual.
REMEMBER: USE ONLY HITACHI BATTERIES TYPES EB7, EB9, EB12, EB2, B-2, B-3
or B-4. OTHER TYPES OF BATTERIES MAY BURST AND CAUSE INJURY!
Follow these instructions to avoid the risk of injury:
WARNING: Improper use of the battery or battery charger can lead to
serious injury. To avoid these injuries:
1. NEVER disassemble the battery.
2. NEVER incinerate the battery, even if it is damaged or is completely worn out.
The battery can explode in a fire.
3. NEVER short-circuit the battery.
4. NEVER insert any objects into the battery charger’s air vents. Electric shock or
damage to the battery charger may result.
5. NEVER charge outdoors. Keep the battery away from direct sunlight and use
only where there is low humidity and good ventilation.
6. NEVER chargewhenthetemperatureisbelow41°F(5°C)orabove104°F(40°C).
7. NEVER connect two battery chargers together.
8. NEVER insertforeignobjectsintotheholeforthebatteryorthebatterycharger.
9. NEVER use a booster transformer when charging.
10. NEVER use an engine generator or DC power to charge.
11. NEVER store the battery or battery charger in places where the temperature
may reach or exceed 104°F (40°C).
12. ALWAYS operate charger on standard household electrical power (120 volts).
Using the charger on any other voltage may overheat and damage
the charger.
13. ALWAYS wait at least 15 minutes between charges to avoid overheating the
charger.
14. ALWAYS disconnect the power cord from its receptacle when the charger is
not in use.
!

10
DISPOSAL OF THE EXHAUSTED BATTERY
WARNING: Do not dispose of the exhausted battery. The battery must
explode if it is incinerated. The product that you have pur-
chased contains a rechargeable battery. The battery is recy-
clable. At the end of it’s useful life, under various state and
local laws, it may be illegal to dispose of this battery into the
municipal waste stream. Check with your local solid waste
officialsfordetailsinyourareaforrecyclingoptionsorproper
disposal.
SAVE THESE INSTRUCTIONS
AND
MAKE THEM AVAILABLE TO
OTHER USERS OF THIS TOOL!
!

11
OPERATION AND MAINTENANCE
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 attach-
ments that differ from those on your own power tool.
MODEL
WH8D2: with charger and case
NAME OF PARTS
1. Impact Wrench (WH8D2)
2. Battery Charger (UC12Y)
Socket Nameplate
Push Button
Switch Trigger
Battery (EB9)
䡬Battery (EB9)
Terminal Hole
Nameplate Latch
Fig. 1
Fig. 2
Cord
Body Battery Installation Hole
Nameplate
Pilot Lamp

12
SPECIFICATIONS
1. Cordless Impact Wrench (WH8D2)
Motor DC Motor
No-load speed 2200 rpm
Capacity 5/32'’(M4) –15/32'’(M12) (Ordinary bolt)
Tightening torque Maximum 66 ft-lb (900 kg-cm)
Tightening is M12 high tensile bolt, when fully charged
in 68°F (20°C) temp.
Tightening time: 3 sec. (Use hexagonal socket.)
Square drive 3/8'’(9.5 mm)
Battery (EB9) Nickel cadmium battery
Voltage ................................................................ DC9.6V
Charging & discharging frequency .... about 500 times
Weight 3.1 Ibs (1.4kg)
2. Battery Charger (UC12Y)
Input power source Single phase: AC 120V 60Hz
Charging time Approx. One hour (At a temperature of 68°F (20°))
Charger Charging voltage .................. DC 2.4 –12V
Charging current DC............. 1.3A
Weight 2.9 Ibs (1.3kg)

13
1Battery Charger (UC12Y) ...... 1
Fig. 3
ACCESSORIES
WARNING: Accessories for this power tool are mentioned in this
Instruction Manual.
The use of any other attachment or accessory can be danger-
ous and could cause injury or mechanical damage.
STANDARD ACCESSORIES
OPTIONAL ACCESSORIES...sold separately
1. Battery (EB9) (Code No. 991644Z)
1
Fig. 4
!
1

14
8 mm 996125 M5 (3/16'') 5/16'' (8 mm) B
10 mm 996126 M6 (3/4'') 3/8'' (10 mm) B
12 mm 996127 M8 (5/16'') W5/16'' 15/32'' (12 mm) C
13 mm 996128 M8 (5/16'') 1/2'' (13 mm) B
14 mm 996129 M10 (3/8'') 9/16'' (14 mm) B
16 mm 996130 M10 (3/8'') 5/8'' (16 mm) D
17 mm 996131 M10 (3/8'') M12 (15/32'') W3/8'' 21/32'' (17 mm) D
18 mm 996132 M12 (15/32'') 23/32'' (18 mm) D
19 mm 996133 M12 (15/32'') W7/16'' 3/4'' (19 mm) D
2. Sockets
3. Long Socket
1-5/16'' 3/16'' 1/2''
(33 mm) (5 mm) (13 mm)
1-5/16'' 1/4'' 5/8''
(33 mm) (6 mm) (16 mm)
1-5/16'' 9/32'' 3/4''
(33 mm) (7 mm) (19 mm)
1-5/16'' 5/16'' 25/32''
(33 mm) (8 mm) (20 mm)
1-5/16'' 5/16'' 13/16''
(33 mm) (8 mm) (21 mm)
1-5/16'' 11/32'' 15/16''
(33 mm) (9 mm) (24 mm)
1-5/16'' 3/8'' 1''
(33 mm) (10 mm) (25 mm)
1-5/16'' 3/8'' 1-1/32''
(33 mm) (10 mm) (26 mm)
1-5/16'' 15/32'' 1-1/16''
(33 mm) (12 mm) (27.5 mm)
Square head
drive dimen-
sions S Part Name Code No. Hexagonal
width across
flats H
Suitable Bolt Diameter Main Socket
Dimensions
ISO ISO Inch
(ordinary) (small) bolts LL1␾F
Hexagonal
Socket
3/8''
(9.5 mm)
From
Table 2
Form DForm CForm B
Form B Form DForm C
HL2 L
L1
øF
S
HL2 L
L1
øF
S
H
øF
L1L2 L
S
H
L
L1
øF
S
H
L
L1
øF
S
H
L
L1
øF
S

15
Table 3
Code No. Main Socket
Dimensions
3/8''
(9.5 mm) Long Socket
Part Name
Suitable Bolt Diameter
ISO ISO Inch
(ordinary) (small) bolts
8 mm 996134 M5 (3/16'') 5/16'' (8 mm) B
10 mm 996135 M6 (1/4'') 3/8'' (10 mm) B
12 mm 996136 M8 (5/16'') W5/16'' 15/32'' (12 mm) C
13 mm 996137 M8 (5/16'') 1/2'' (13 mm) B
14 mm 996138 M10 (3/8'') 9/16'' (14 mm) B
16 mm 996139 M10 (3/8'') 5/8'' (16 mm) D
17 mm 996140 M10 (3/8'') M12 (15/32'') W3/8'' 21/32'' (17 mm) D
18 mm 996141 M12 (15/32'') 23/32'' (18 mm) D
19 mm 996142 M12 (15/32'') W7/16'' 3/4'' (19 mm) D
Square head
drive dimen-
sions S
Hexagonal
width across
flats H From
2-3/8'' 15/32'' 1-7/8'' 1/2''
(60 mm) (12 mm) (48 mm) (13 mm)
2-3/8'' 15/32'' 1-7/8'' 5/8''
(60 mm) (12 mm) (48 mm) (16 mm)
2-3/8'' 9/16'' 1-7/8'' 23/32''
(60 mm) (14 mm) (48 mm) (18.4 mm)
2-3/8'' 9/16'' 1-7/8'' 3/4''
(60 mm) (14 mm) (48 mm) (18.9 mm)
2-3/8'' 19/32'' 1-7/8'' 49/64''
(60 mm) (15 mm) (48 mm) (19.5 mm)
2-3/8'' 19/32'' 1-7/8'' 15/16''
(60 mm) (15 mm) (48 mm) (24 mm)
2-3/8'' 19/32'' 1-7/8'' 1''
(60 mm) (15 mm) (48 mm) (25 mm)
2-3/8'' 5/8'' 1-7/8'' 1-1/32''
(60 mm) (16 mm) (48 mm) (26 mm)
2-3/8'' 21/32'' 1-7/8'' 1-1/16''
(60 mm) (17 mm) (48 mm) (27.5 mm)
4. Extension bar: Code No. 996143
Theextensionbarisconvenientforworkinginveryrestrictedspacesorwhenthe
socket provided connot reach the bolt to be tightened.
CAUTION:
When the extension bar is used the tightening torque is reduced slightly
comparedwith the ordinarysocket.So it is necessaryto operate the toolalittle
longer to get the same torque.
5. Universal joint: Code No. 996147
The universal joint convenient for impacting nuts when there is an angle
between the socket and wrench, or when working in a very narrow space.
Fig. 6
Fig. 5
!
LL1L2␾F

16
6. 12.7 mm (1/2") Square adaptor: Code No. 996145
Thisis used when using a socket with square hole dimensions of1/2" (12.7 mm)
Fig. 7
7. Bit adaptor: Code No. 996144
This is used for tightening small screws (3/16" (M5) –5/16" (M8)) Before using
please refer to the item ''OPERATIONAL CAUTIONS''.
Fig. 8
●Applicable bit 1/4'' (6.35 mm)
Bit No.
L5/8''
(16 mm)
Fig. 9
Bit No. L Code No.
No. 2 1 –3/4'' (45 mm) 955229
2 –3/4'' (70 mm) 955654
No. 3 1 –3/4'' (45 mm) 955230
2 –3/4'' (70 mm) 955655
CAUTION
Recommended accessories for this Electric Power Tool are mentioned in this
manual.
The use of any other attachment or accessory might be hazardous.
APPLICATIONS
䡬Tightening and loosening of all types of bolts and nuts, used for securing
structural items.
!

17
REMOVAL AND INSTALLATION METHOD OF BATTERY
䡬How to remove the battery.
Hold the handle tight.
Press the latch located at the front of the
battery and pull out the battery. (Fig. 10)
䡬How to install the battery.
Positionthebatterysothatthelatchfaces
toward the switch trigger in the handle
and insert the battery. (Fig. 10)
Handle
Insert
Pull out
Battery
Latch
CHARGING METHOD
NOTE:
Before plugging into the receptacle, make
sure the following points.
䡬Thepowersourcevoltageisstatedonthe
nameplate.
䡬The cord is not damaged.
WARNING:
Do not charge at voltage higher than
indicated on the nameplate.
If charged at voltage higher than indi-
cated on the nameplate, the charger
will burn up.
1. Inserttheplugofbatterychargerinto
the receptacle.
When the plug of battery charger has
been inserted into the receptacle, pilot
lampwillblinkslowly.(At1-secondinter-
vals.)
Nameplate
Pilot Lamp
Fig. 11
Fig. 10
!

18
WARNING: Do not use the electrical cord if damaged.
Have it repaired immediately.
2. Insert the battery to the battery charger.
Insert the battery into the battery charger as shown in Fig. 11.
Make sure it contacts the bottom of the battery charger.
3. Charging
䡬When the battery is connected to the battery charger, charging will com-
mence and the pilot lamp will light on. (See Table 4)
NOTE: If the pilot lamp blinks, pull out the plug from the receptacle and
check if the battery is properly mounted.
䡬In approx. one hour, when the battery is fully charged, the pilot lamp will
blink slowly (At 1-second intervals.) (See Table 4)
Table 4
Indications of the pilot lamp
Before charging Blinks Lights for 0.5 seconds. Goes out for 0.5
seconds.
While charging Lights Lights continuously
Charging complete Blinks Lights for 0.5 seconds. Goes out for 0.5
seconds.
Charging impossible Blinks Lights for 0.1 seconds. Goes out for 0.1
seconds.
7777777777777
4. Disconnect battery charger from the receptacle.
CAUTION: Do not pull the plug out of the receptacle by pulling on the cord.
Make sure to grasp the plug when removing from receptacle to
avoid damaging cord.
5. Remove the battery from the battery charger.
Supporting the battery charger with hand, pull out the battery from the battery
charger.
!
!

19
CAUTION:
●Whenthebatterychargerhasbeencontinuouslyused,thebatterychargerwill
be heated, thus constituting the cause of failures. Once the charging has been
completed, give 15 minutes rest until the next charging.
●If the battery is recharged when it is warm due to battery use or exposure to
sunlight,thepilotlampmaynotlight.Thebatterywillnotberecharged.Insuch
a case, let the battery cool before charging.
●If the pilot lamp blinks quickly (at 0.2-second intervals), check for and take out
any foreign objects in the charger’s battery installation hole.
If there are no foreign objects, it is probable that the battery or charger is
malfunctioning. Bring them to HITACHI AUTHORIZED SERVICE CENTER.
PRIOR TO OPERATION
1. Confirm that the battery is mounted correctly
2. Selecting the socket to be matched to the bolt
Be sure to use a socket which is matched to the bolt to be tightened. Using an
impropersocketwillresultnotonly in insufficient tightening but also in damage
to the socket or nut.
A worn or deformed hex or suqare-holed socket will not give an adequate
tightness for fitting to the nut or anvil, consequently resulting in loss of
tightening torque.
Pay attention to wear of socket hole, and replace before further wear has
developed.
Matching socket and bolt sizes are shown in Tables 2 and 3.
Thenumericalvalueofasocketdesignationdenotestheside-to-sidedistance(H)
of its hex hole.
3. Mounting the socket (Fig. 12)
Align the plunger loated in the square
part of the anvil with the hole in the hex.
socket and mount the hex. socket on the
anvil. Check that the plunger is fully en-
gaged in the hole.
Hex. Socket Hole Plunger Anvil
Fig. 12
!

20
HOW TO USE
1. Check the direction of rotation.
Thesocketrotatesclockwise(viewedfrom
therearside)bypushingtheR-sideofthe
push button.
TheL-sideofthepushbuttonispushedto
turn the socket counterclockwise. (See
Fig. 13) (The R: and L marks are provided
on the body.)
CAUTION: The push button can not be
switched while the impact
wrenchisturning.Toswitch
thepushbutton,stoptheim-
pact wrench, then set the
push button.
2. Switch operation
䡬Whentheswitchtriggerispulled,the
socket rotates.
When trigger is let loose, the socket
stops.
RIndication
[Clockwise]
Push Button
Push
[Counterclockwise]
Fig. 13
!
3. Tightening and loosening bolts
A hex socket matching the bolt or nut must firest be selected. Then mount the
socketontheanvil,andgripthenuttobetightenedwiththe hex socket. Holding
the wrench in line with the bolt, press the power switch to impact the nut for
several second.
Ifthenutisonlylooselyfittedtothebolt,theboltmayturnwiththenut,therefore
preventing proper tightening. In this case, stop impact on the nut and hold the
bolt head with a wrench before restarting impact, or manually tighten the bolt
and nut to prevent them slipping.
LIndication
Push