Hitachi WH14DBL Manual

CORDLESS IMPACT DRIVE
R
WH 14DBL
WH 14DBL
Feb. 2008
LIST No.: G893
MODEL
W

REMARK:
Throughout this TECHNICAL DATAAND SERVICE MANUAL, a symbol(s) is(are) used in the
place of company name(s) and model name(s) of our competitor(s). The symbol(s) utilized here
is(are) as follows:
Competitors
Symbols Utilized Company Name Model Name
P MAKITA BTD130F

CONTENTS
Page
1. PRODUCT NAME ---------------------------------------------------------------------------------------------------------- 1
2. MARKETING OBJECTIVE ---------------------------------------------------------------------------------------------- 1
3. APPLICATIONS ------------------------------------------------------------------------------------------------------------ 1
4. STANDARD EQUIPMENT ----------------------------------------------------------------------------------------------- 1
5. SELLING POINTS --------------------------------------------------------------------------------------------------------- 2
5-1. Selling Point Descriptions ---------------------------------------------------------------------------------------- 3
6. SPECIFICATIONS --------------------------------------------------------------------------------------------------------- 7
6-1. Specifications ---------------------------------------------------------------------------------------------------- 7
6-2. Optional Accessories ------------------------------------------------------------------------------------------- 8
7. COMPARISONS WITH SIMILAR PRODUCTS --------------------------------------------------------------------- 9
7-1. Specification Comparisons ----------------------------------------------------------------------------------- 9
7-2. Tightening Torque------------------------------------------------------------------------------------------------10
7-3. Tightening Time --------------------------------------------------------------------------------------------------13
7-4. Number of Screws or Bolts Driven --------------------------------------------------------------------------14
8. PRECAUTIONS IN SALES PROMOTION --------------------------------------------------------------------------15
8-1. Safety Instructions -------------------------------------------------------------------------------------------------15
8-2. Tightening Torque Inspection Prior to Operation ----------------------------------------------------------18
8-3. Tightening Torque Variation--------------------------------------------------------------------------------------18
8-4. Precautions for Efficient Use of Charger---------------------------------------------------------------------19
9. OTHER PRECAUTIONS--------------------------------------------------------------------------------------------------20
10. REPAIR GUIDE------------------------------------------------------------------------------------------------------------21
10-1. Precautions in Disassembly and Reassembly------------------------------------------------------------21
10-2. Precautions in Disassembly and Reassembly of Battery Charger-----------------------------------33
11. STANDARD REPAIR TIME (UNIT) SCHEDULES ---------------------------------------------------------------34
Assembly Diagram for WH 14DBL

-1-
1. PRODUCT NAME
Hitachi Cordless Impact Driver, Model WH 14DBL
2. MARKETING OBJECTIVE
The new cordless impact driver Model WH 14DBL is equipped with the newly developed and
highly efficient brushless motor. Features of the Model WH 14DBL include the following.
•1.3 times higher performance thanks to the highly efficient brushless motor (compared with the
Model WH 14DSL)
•Light and smooth triggering of the electronic switch and longer service life
•Wide range of applications thanks to the single/continuous selector switch and the 4-step
high/low selector switch (tightening mode selector function)
•Highest tightening torque in its class (150 N•m)
•Battery level warning lamp
•Built-in LED light
With the new Model WH 14DBL, we aim to expand our market share.
3. APPLICATIONS
•Tightening/loosening of small screws, tapping screws, wood screws, bolts, nuts, etc.
•Drilling into wood and various other materials (with use of optional accessory drill chuck
adapter).
[Applicable Markets]
•Wood-product assembly: Tightening/loosening of wood screws
•Construction industry: Assembly of scaffolding, roofing, aluminum sashes, fencing, etc.; removal
of plastic cones from concrete forms, mounting/removal of form ties; drilling into the wood
frames of concrete forms, etc.
•Manufacturing industry: Assembly work for automobiles, rolling stock, shipbuilding, agricultural
machinery and tools, industrial machines, steel furniture, etc.
•Utility industry: Assembly and installation of electric equipment, plumbing facilities, air
conditioning (duct assembly etc.), sanitary fixtures and various other facilities.
•Service industry: General repair work; installation of advertising aids, automobile repair,
assembly of garages and carports storage sheds, etc.
•Various other assembly, construction or repair facilities
4. STANDARD EQUIPMENT
Models WH 14DBL
(1) 2LSCK specification: Two BSL 1430 batteries (Li-ion, capacity 3.0 Ah), battery cover,
UC 18YRSL charger and case
(2) NN specification: Only the main body

-2-
5. SELLING POINTS
Slide type lithium-ion battery
Type BSL 1430 (Capacity: 3.0 Ah)
The Type BSL 1430 lithium-ion battery is equipped with the
overdischarge protection circuit, overcurrent protection circuit
and voltage monitoring circuit for each cell for longer service
life and safety.
• The Model WH 14DBL is equipped with the overdischarge
and overcurrent protection circuit to prevent overdischarge
(overuse) of the battery.
• The Type BSL 1430 lithium-ion battery is equipped with the
voltage monitoring circuit for each cell to prevent overcharge
of the battery.
Highest tightening torque in its class (150 N•m)
Battery level warning lamp
Electronic switch
Brushless motor
Built-in white LED light
Tightening mode selector function
Charger specifically designed
for slide type lithium-ion
batteries
Model UC 18YRSL
Latch
(on both sides)
(2) Remove. (1) Push.
Battery

-3-
Conventional DC motor
Friction is generated between the carbon brush
and the commutator. Such an electric loss
affects the efficiency of the tool.
Brushless motor
The rotator can be rotated without the use of
carbon brushes and commutators because
the current that is applied to the stator coil is
sequentially switched in the inverter circuit.
Thus no friction and electric loss are
generated. The Model WH 14DBL can
operate at a low current and its working
performance is 1.3 times higher than the
Model WH 14DSL.
Carbon brush
Commutator
Inverter
Rotator
Stator
Rotator
Stator
Magnet
Motor coil
Motor coil
Magnet
Conventional switch The operational load of
the switch trigger is high
in order to activate the
mechanical contact
where high current is
applied. Thus the
contact is apt to be
deteriorated and it
affects the service life.
Electronic switch The triggering force of the
electronic switch is about
50% less than that of the
conventional model and
the switch movement is
smooth thanks to the
signal contact. Moreover,
it has longer service life
because high current is
not applied to the inside
of the switch and
deterioration of the
contact is minimized.
5-1. Selling Point Descriptions
(1) Brushless motor
The newly developed brushless motor does not require conventional carbon brushes and
commutators. Therefore, the Model WH 14DBL can operate at a low current without friction
and electric loss. Its working performance per charge is 1.3 times higher than the Model
WH 14DSL.
(2) Electronic switch
The triggering force of the electronic switch is about 50% less than that of the conventional
model. Thus the switch moves smoothly and it is easy to adjust finely. Moreover, it has longer
service life because high current is not applied to the switch.
The contact is apt to be deteriorated
because high current is always
applied to the inside of the switch.
Longer service life because
high current is not applied to
the inside of the switch.

-4-
(3) Tightening mode selector function
The Model WH 14DBL can be used for wide range of applications such as heavy load works
requiring high tightening torque and delicate works thanks to the single/continuous selector
switch and the 4-step high/low selector switch.
• Single mode
When the trigger switch is pulled to start operation, bolt tightening stops automatically after 1
to 4 tightenings.
• Continuous mode
When the trigger switch is pulled to start operation, bolt tightening continues (without
stopping automatically).
• High/low selector switch
The rotation speed changes in 4 steps (500, 1,200, 2,000 and 2,600 min-1) each time the
high/low selector switch is pressed.
NOTE:
• When the forward/reverse button is set to reverse, the high/low mode and the
single/continuous mode are set to "High" and "Continuous" respectively, regardless of
the indicators on the switch panel.
• The high/low and single/continuous selector switches can only be set after the battery
has been installed in the driver and the trigger switch has been pulled once.

-5-
WH 14DSL
WH 14DBL
153 141
0
500
1,000
1,500
2,000
P
N•mkgf•cm
0
50
100
150
200
157
Fig. 1 Tightening torque comparison
(4) Highest tightening torque in its class (150 N•m*)
The maximum tightening torque of the Model WH 14DBL is 150 N•m thanks to the brushless
motor and the optimum striking timing. The data below shows a comparison of actual
measurement among the Model WH 14DBL, Model WH 14DSL and P.
(a) Tightening torque comparison
The following graph shows the torque required for tightening an M14 high-strength bolt in 3
seconds with a socket adapter and a hexagon socket (overall length 40 mm).
(b) Tightening time comparison
The following graph shows the time required for driving a wood screw (5.3 mm in diameter
and 120 mm in length) into lauan. The Model WH 14DBL can drive long screws into hard
workpieces at high speed.
←Fast Slow →
Voltage Model 12345678910 (sec.)
14.4 V HITACHI
WH 14DBL 6.7
14.4 V HITACHI
WH 14DSL 6.9
14.4 V P7.4
Fig. 2 Tightening time comparison
* Based on our own research
(14.4-V cordless impact drivers)

-6-
(5) Remaining battery indicator
The Model WH 14DBL is equipped with the remaining battery indicator that is the same as the
well-reputed indicator of the current Model WH 14DSL. The battery remaining power can be
checked just by pressing the remaining battery indicator switch.
(6) Built-in white LED light
The Model WH 14DBL incorporates the white LED light that is the same as the well-reputed
light of the current Model WH 14DSL. It is very convenient for operation in dark places.
State of
lamp Battery remaining power
The battery remaining power
is enough (about 60% or
higher).
The battery remaining power
is a half.
The battery remaining power
is nearly empty (about 30% or
lower). Recharge the battery
immediately.
NOTE:
• The remaining battery indicator
lamp lights only after the battery
has been installed in the driver and
the trigger switch has been pulled
once.
• The indicator lamps of the high/lo
w
selector switch and the single/
continuous selector switch go off
immediately even though the
trigger switch is pulled when the
battery remaining power is nearly
empty and the protection function
is activated. It is not faulty.
NOTE:
• To prevent the battery power consumption
caused by forgetting to turn off the LED light,
the light goes off automatically in about 15
minutes.
• The white LED light is lighted by pressing the
light switch only after the battery has been
installed in the driver and the trigger switch
has been pulled once.

-7-
6. SPECIFICATIONS
6-1. Specifications
Model WH 14DBL
Capacity Small screw*14 to 8 mm
Ordinary bolt M5 to M14
High-strength bolt M5 to M12
Tightening torque*2150 N•m (1,530 kgf•cm, 1,330 in-lbs.)
Tip condition 6.35 mm (1/4”) hex. bit shank
Type of motor Fan cooled DC brushless motor
Main body Polyamide resin and elastomer ------------------Housing
Aluminum alloy die casting ------------------------ Hammer case
Elastomer ---------------------------------------------Front cover
Battery Polycarbonate resin
Enclosure
Charger ABS resin
Type of switch Variable speed trigger switch with forward/reverse changeover lever (with
brake)
Handle configuration T-type
No-load rotational speed
(When the battery is fully
charged at ambient
temperature 20°C)
High mode 0 to 2,600 min-1 Low 2 mode 0 to 1,200 min-1
Medium mode 0 to 2,000 min-1 Low 1 mode 0 to 500 min-1
Impact rate
(When the battery is fully
charged at ambient
temperature 20°C)
High mode 0 to 3,200 min-1 Low 2 mode 0 to 1,500 min-1
Medium mode 0 to 2,400 min-1 Low 1 mode 0 to 600 min-1
Main body*31.5 kg (3.3 lbs.) (Including battery)
Weight Battery 0.5 kg (1.1 lbs.)
Overall length x height 155 mm (6-1/8”) x 238 mm (9-3/8”)
Center height 29 mm (1-9/64”)
LED light White LED
Remaining battery
indicator lamp Red LED
Battery
(Type BSL 1430)
Sealed cylindrical lithium-ion battery
Nominal voltage: DC 14.4 V
Nominal capacity: 3.0 Ah
Nominal life: Charging/discharging approximately 1,500 cycles
(in the case of the Model UC 18YRSL charger)
Charger
(Model UC 18YRSL)
Overcharge protection system:
(1) Battery voltage detection (- V system)
Battery temperature detection (dT/dt system)
(2) Battery surface temperature detection (thermostat or thermistor)
(3) 120-minute timer
(4) Stop current detection
Power input: 90 W
Charging time:Approx. 45 minutes [for Type BSL1430 battery at 20°C (68°F)]
Operable ambient temperature range: 0°C to 40°C (32°F to 104°F)
The maximum allowable temperature of the Type BSL 1430 battery is 50°C (122°F).
Indication method of battery charging function

-8-
*1: M3 (1/8") tapping screws and wood screws are the smallest screws that can be tightened.
*2: The maximum tightening torque is based on tightening an M14 high-strength bolt (strength grade 12.9) for 3
seconds with a socket adapter and a hexagonal socket (entire length 40 mm).
*3: The main body weight does not include the standard accessories and the hook, but includes the battery.
6-2. Optional Accessories
• Plus driver bit
• Hexagon socket
Part name Stamped figure L
(mm) B (mm) Code No.
5 mm hexagon socket 8 65 (2-9/16”) 8 (5/16”) 996177
6 mm hexagon socket 10 65 (2-9/16”) 10 (3/8”) 985329
5/16” hexagon socket 12 65 (2-9/16”) 12 (15/32”) 996178
8 mm hexagon socket 13 65 (2-9/16”) 13 (1/2”) 996179
10 mm hexagon socket (small type) 14 65 (2-9/16”) 14 (9/16”) 996180
10 mm hexagon socket 16 65 (2-9/16”) 16 (5/8”) 996181
10 mm hexagon socket 17 65 (2-9/16”) 17 (21/32”) 996182
1/2” hexagon long socket 21 166 (6-17/32”) 21 (53/64”) 996197
• Drill chuck adaptor set (Code No. 321823)
The drill chuck adaptor set permits mounting of various types of locally-available drill bits for a
variety of drilling operations.
Bit No. Code No.
No. 2 992671
No. 3 992672
50 mm (2”)
Stamped figure
BL

-9-
7. COMPARISONS WITH SIMILAR PRODUCTS
7-1. Specification Comparisons
Maker HITACHI
Item Model WH 14DBL WH 14DSL WH 14DL P
Small screw M 4 to M 8
(5/32" to 5/16") *1 M 4 to M 8
(5/32" to 5/16") *1 M 4 to M 10 (5/32" to 3/8") *1 M 4 to M 8 (5/32" to 5/16")
Ordinary bolt M 5 to M 14
(3/16" to 9/16") M 5 to M 14 (3/16" to 9/16") M 6 to M 14 (1/4" to 9/16") M 5 to M 14 (3/16" to 9/16")
Capacity
High-strength bolt M 5 to M 12
(3/16" to 15/32") M 5 to M 12 (3/16" to 15/32") M 6 to M 12 (1/4" to 15/32") M 5 to M 12 (3/16" to 15/32")
Max. tightening
torque *2 N･m150
(1,530 kgf･cm,
1,330 in-lbs.)
145
(1,480 kgf･cm,
1,280 in-lbs.)
140
(1,430 kgf･cm,
1,240 in-lbs.)
140
(1,430 kgf･cm,
1,240 in-lbs.)
No-load rotational
speed min-1
High: 0 to 2,600
Medium: 0 to 2,000
Low 2: 0 to 1,200
Low 1: 0 to 500
High: 0 to 2,600
Low: 0 to 2,000 High: 0 to 2,600 Low: 0 to 2,000 0 to 2,400
Impact rate min-1
High: 0 to 3,200
Medium: 0 to 2,400
Low 2: 0 to 1,500
Low 1: 0 to 600
High: 0 to 3,200
Low: 0 to 2,400 High: 0 to 3,200 Low: 0 to 2,400 0 to 3,200
Catalog specifications
Main body weight *3 kg 1.5 (3.3 lbs.) 1.4 (3.1 lbs.) 1.5 (3.3 lbs.) 1.4 (3.1 lbs.)
Max. tightening
torque *2 N･m157
(1,600 kgf･cm,
1,390 in-lbs.)
153
(1,560 kgf･cm,
1,355 in-lbs.)
150
(1,530 kgf･cm,
1,330 in-lbs.)
141
(1,440 kgf･cm,
1,250 in-lbs.)
No-load rotational
speed min-1
High: 0 to 2,550
Medium: 0 to 1,950
Low 2: 0 to 1,270
Low 1: 0 to 560
High: 0 to 2,580
Low: 0 to 1,960 High: 0 to 2,610 Low: 0 to 2,040 0 to 2,420
Impact rate min-1
High: 0 to 2,860
Medium: 0 to 2,260
Low 2: 0 to 1,280
Low 1: 0 to 640
High: 0 to 2,790
Low: 0 to 2,210 High: 0 to 3,190 Low: 0 to 2,490 0 to 3,160
Overall length x height mm 155 x 238
(6-1/8" x 9-3/8") 145 x 235 (5-45/64" x 9-1/4") 162 x 236 (6-3/8" x 9-19/64") 146 x 235 (5-3/4" x 9-1/4")
Center height mm 29 (1-9/64") 29 (1-9/64") 27 (1-1/16") 29 (1-9/64")
Main body weight *3 kg 1.55 (3.4 lbs.) 1.49 (3.3 lbs.) 1.58 (3.5 lbs.) 1.45 (3.2 lbs.)
Measured figures
No-load sound
pressure level dB(A)71707273
Brushless Motor Provided Not provided Not provided Not provided
Type of switch
Signal terminal
electronic switch
with forward/reverse
changeover lever
Variable speed
switch with
forward/reverse
changeover lever
Variable speed
switch with
forward/reverse
changeover lever
Variable speed
switch with
forward/reverse
changeover lever
Tightening mode selector Single/Continuous
4-mode 2-mode 2-mode *4 Not provided
Remaining battery indicator Provided Provided Not provided Not provided
LED light Provided Provided Provided Provided
Voltage V 14.4 14.4 14.4 14.4
Type BSL 1430 BSL 1430 BCL 1430 BL1430
Nominal capacity Ah 3.0 3.0 3.0 3.0
Nominal voltage V 14.4 14.4 14.4 14.4
Battery
Ambient temperature °C0 to 40 0 to 40 0 to 40 -
Model UC 18YRSL UC 18YRSL UC 18YRL DC 18SC
Nominal input capacity VA 90 90 95 -
Charger
Recharging voltage V 7.2 to 18 7.2 to 18 7.2 to 18 7.2 to 18
Standard accessories
•Plastic tool case
•Charger
(UC 18YRSL)
•Rechargeable battery
•Battery cover
•Plastic tool case
•Charger
(UC 18YRSL)
•Rechargeable battery
•Battery cover
•Plastic tool case
•Charger
(UC 18YRL)
•Rechargeable battery
•Plastic tool case
•Charger
(DC 18SC)
•Rechargeable battery
*1: M3 (1/8") tapping screws and wood screws are the smallest screws that can be tightened.
*2: The max. tightening torque is based on tightening an M14 (9/16") bolt (strength grade: 12.9) for 3 seconds with a
hexagon socket.
*3: The main body weight does not include accessory tools and hook (hexagon bit etc.).
*4: Depending on specifications

-10-
2,600 min-1
0
500
1,000
1,500
2,000
Continuous
N･mkgf･cm
50
100
150
200
100
25
50
150
0
2,000 min-1 1,200 min-1 500 min-1
Continuous Continuous Continuous
7-2. Tightening Torque
7-2-1. Comparison of tightening torque in each mode
The data below shows the tightening torque obtained in each mode of the Model WH 14DBL.
Please note that the data are intended for reference purposes only because the actual tightening
torque may vary depending on hardness of workpieces, diameter of thread, ambient temperature,
characteristics of the battery, etc.
• Tightening torque in continuous mode
The following graph shows the torque required for tightening an M14 high-strength bolt in 3
seconds with a socket adapter and a hexagon socket (overall length 40 mm).
Fig. 3 Tightening torque in continuous mode
• Tightening torque in single mode
The single mode is applicable to delicate works such as tightening small diameter screws and
light load works such as affixing plasterboards. Please note that the actual tightening torque
may vary depending on hardness of workpieces, diameter of thread, ambient temperature,
characteristics of the battery, etc. If the appropriate tightening torque is exceeded especially
when tightening small diameter machine screws, the screws may be damaged. The customers
should be advised to adjust the rotational speed according to the application with the high/low
selector switch and check that the tightening torque is appropriate before operation.
Rotational
speed
Single/
Continuous

-11-
7-2-2. Screw diameter and appropriate tightening torque
Generally speaking, the appropriate tightening torque for a screw can be determined by the
strength grade of the screw and the material tightened. Tables 1 and 2, and Fig. 4 below list data
relative to the strength grade of various screws and the appropriate tightening torque. For further
reference, appropriate tightening torque is calculated with the following formula. Study and use
this formula for accurate selection of tightening torque.
T=k•d•p
T: Appropriate tightening torque (kgf•cm)
d: Nominal diameter of thread (mm)
p: Recommended axial tightening force to be applied to the screw (kgf)
p = Rated axial stress (kgf/mm2) x 0.8 x Effective sectional area of thread (mm2)
k: Torque coefficient (0.17)
• Strength grade and rated axial stress of thread
Table 1
Strength grade 4.8 6.8 8.8 12.9
Rated axial stress (kgf/mm2) 29.1 43.7 58.2 95
Material Mild steel Alloy steel including Ni, Mn, Cr, etc.
Heat treatment Not processed Processed: Hard material
• Diameter and effective sectional area of thread
Table 2
Kind of thread x pitch M5 x 0.8 mm
(3/16") M6 x 1 mm (1/4") M8 x 1.25 mm (5/16") M10 x 1.5 mm (3/18") M12 x 1.75 mm (15/32") M14 x 2 mm (9/16")
Effective sectional area
of thread (mm2)14.2 20.1 36.6 58.0 84.3 115
• Thread diameter and appropriate tightening torque
Fig. 4

-12-
7-2-3. Tightening torque characteristics
The graph below shows the relationship between tightening time and tightening torque according to
types of bolts. The data below are intended for reference purposes only because actual tightening
torque may vary depending on tightening conditions.
NOTE:
• The term "tightening time" means the impact time after the lower surface of the bolt comes
in contact with the washer.
• Each bolt is directly tightened into a steel plate under the following tightening conditions.
Accordingly, the torque goes up very abruptly in comparison with the actual bolt tightening
conditions.
Washe
r
Bolt
Nut
Steel plate thickness t
Following bolts were used.
Ordinary bolt: Strength grade 4.8
High-strength bolt: Strength grade 12.9
Strength grade is read as follows.
4.8 Yield point of bolt 320 N/mm2 {32 kgf/mm2, 45,500 psi }
Tensile strength of bolt 400 N/mm2 {40 kgf/mm2, 56,900 psi }
Tightening torque
Tightening time sec.
(Steel plate thickness t = 25 mm)
Ordinary bolt
High-strength bolt
Tightening torque
Ordinary bolt
High-strength bolt
Tightening time sec.
(Steel plate thickness t = 25 mm)

-13-
7-3. Tightening Time
The performance of the Model WH 14DBL is superior to the competitors thanks to the large
hammer and the optimized impact timing. A tightening time comparison is shown below. The data
below are intended for reference purposes only because actual tightening time may vary
depending on hardness of the workpiece, ambient temperature, characteristics of the battery, etc.
1) Wood screw 5.3 mm dia. x 120 mm length, lauan
2) Wood screw 4.5 mm dia. x 90 mm length, hemlock spruce
3) Wood screw 4.5 mm dia. x 75 mm length, hemlock spruce

-14-
7-4. Number of Screws or Bolts Driven
7-4-1. Per-charge working capacity comparison
The table below shows a comparison of the number of screws or bolts that can be driven per
battery charge by the Models WH 14DBL, WH 14DSL and WH 14DL and P. Please note that the
data below are intended for reference purposes only because the number of screws that can be
driven per charge may vary depending on screw tightening conditions, screw size, ambient
temperature and charging capacity of the battery.
Number of screws or bolts driven
Model
Tightening condition HITACHI
WH 14DBL HITACHI
WH 14DSL HITACHI WH 14DL P
Battery BSL 1430
(Nominal
capacity: 3.0 Ah)
BSL 1430
(Nominal
capacity: 3.0 Ah)
BCL 1430
(Nominal
capacity: 3.0 Ah)
BL 1430
(Nominal
capacity: 3.0 Ah)
Wood screw
4.0 mm dia. x 50 mm
(Soft wood) 1,170 800 950 1,000
Wood screw
4.2 mm dia. x 90 mm
(Hard wood) 210 195 155 160
Wood screw
5.3 mm dia. x 120 mm
(Hard wood) 85 60 60 55
Machine screw
(M8 x 16 mm) 2,590 1,650 1,900 2,000

-15-
8. PRECAUTIONS IN SALES PROMOTION
8-1. Safety Instructions
In the interest of promoting the safest and most efficient use of the Model WH 14DBL cordless
impact driver by all of our customers, it is very important that at the time of sale the salesperson
carefully ensures that the buyer seriously recognizes the importance of the contents of the
Handling Instructions, and fully understands the meaning of the precautions listed on the Caution
Plate and Name Plate attached to each tool.
A. Handling Instructions
Salespersons must be thoroughly familiar with the contents of the Handling Instructions in order
to give pertinent advice to the customer. In particular, they must have a thorough understanding
of the precautions in the use of the cordless (battery charger type) electric power tools which are
different from those of ordinary electric power tools.
(1) Before use, ensure that the battery is fully charged.
New battery is not fully charged. Even if the battery was fully charged at the factory, long
periods without use, such as during shipping, cause the storage battery to lose its charge.
Customers must be instructed to fully charge the battery prior to use.
(2) When charging storage battery, use only the exclusive Model UC 18YRSL charger provided
with the tool.
Because of the designed rapid-charging feature, use of other battery chargers is hazardous.
(3) Follow prescribed steps in using the charger.
First connect the storage battery to the charger, then plug the charger into an AC outlet
(ensuring that the voltage matches that indicated on the unit). If this order is reversed, the
charger may not function properly.
(4) Ensure the power source voltage is the same as that indicated on the Name Plate of the
charger. Use of any other power source (DC outlet, fuel powered generator, etc.) will cause
the charger to overheat and burn out.
(5) Do not use any voltage increasing equipment (transformer etc.) between the power source
and the charger.
If the charger is used with voltage over and above that indicated on the unit, it will not function
properly.
(6) Conduct battery charging at an ambient temperature range of 0 °C to 40 °C (32 °F to 104 °F).
Special temperature sensitive devices are employed in the charger to permit rapid charging.
Ensure that customers are instructed to use the charger at the indicated ambient temperature
range. At temperature under 0 °C (32 °F), the thermostat will not function properly, and the
storage battery may be over-charged. At temperatures over 40 °C (104 °F), the storage
battery cannot be sufficiently charged. The optimum temperature range is 20 °C to 25 °C
(68 °F to 77 °F).
(7) The battery charger should not be used continuously.
At high ambient temperature, if over three storage batteries are charged in succession, the
temperature of the coils on the transformer will rise and there is a chance that the temperature
fuse inserted in the interior of the transformer will inadvertently melt. After charging one

-16-
battery, please charge the next battery after about a fifteen-minute interval.
(8) The charger case is equipped with air vents to protect the internal electronic components from
overheating. Caution the customers not to allow foreign materials such as metallic or
flammable objects to be dropped or inserted into the air vents. This could cause electric shock,
fire or other serious hazards.
(9) Do not attempt to disassemble the storage battery or the charger.
Special devices, such as a thermostat, are built into the storage battery and charger to permit
rapid charging. Incorrect parts replacement and/or wiring will cause malfunctions which could
result in fire or other hazards. Instruct the customers to bring the Model WH 14DBL to an
authorized service center in the event repair or replacement is necessary.
(10) Disposal of the storage battery
Ensure that all customers understand that the storage battery should be returned to the
Hitachi power tool sales outlet or authorized service center when it is no longer capable of
being recharged or repaired. If thrown into a fire, the battery may explode, or if discarded
indiscriminately, leakage of the cadmium compound contained in the battery may cause
environmental pollution.
(11) Effect of the permanent magnet
The Model WH 14DBL has a strong permanent magnet in its motor. Please instruct the
customers about adhesion of dust to the Model WH 14DBL and effect on electronic devices as
follows.
• Do not place the Model WH 14DBL on a workbench or workplace where metal dust is
scattered about.
• Do not touch the dust-adhered Model WH 14DBL. Instruct the customers to remove adhered
dust with a brush.
• Users of medical electronics such as a pacemaker must not use or get close to the Model
WH 14DBL.
• Do not bring precision equipment such as a mobile-phone or electronic recording media such
as a magnetic card close to the Model WH 14DBL.
(12) Keep the battery out of dust.
• Protect the battery from being covered with dust during operation.
• Protect the battery from being covered with dust accumulated on the Model WH 14DBL
during operation.
• Do not leave the battery in a dusty area when not in use.
• Remove dust from the battery and store it separating from metallic parts such as screws and
nails.

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WARNING
•To reduce the risk of injury, user must read and
understand Instruction Manual.
AVERTISSEMENT
•Afin de réduire le risque de blessures, I'utilisateur doit lire
et bien comprendre le mode d'emploi.
CAUTION •Read thoroughly HANDLING INSTRUCTIONS
before use. •Do not disassemble nor throw into fire.
CAUTION
•For safe operation, see Instruction Manual.
•Charge HITACHI rechargeable batteries Types BSL 14 and
BSL 18 series. Other types of batteries may burst causing
personal injury and damage.
•Charge between 32 °F and 104 °F. Rest 15 minutes between the
charging of batteries.
•Indoor use only.
•Replace defective cord immediately.
B. Caution Plates
(1) The following cautions are listed on the name plate attached to the main body of each tool.
For the U.S.A. and Canada
(2) The following cautions are listed on the name plate attached to each storage battery.
(3) The following cautions are listed on the Name Plate attached to the Model UC 18YRSL
charger.
For the U.S.A. and Canada