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