Hitachi WR 14DH Manual

POWER TOOLS
TECHNICAL DATA
AND
SERVICE MANUAL
CORDLESS IMPACT WRENCH
WR 14DH
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
LIST No. F841 Aug. 2000
W
MODEL
WR 14DH

1. PRODUCT NAME........................................................................................................................... 1
2. MARKETING OBJECTIVE ............................................................................................................. 1
3. APPLICATIONS.............................................................................................................................. 1
4. SELLING POINTS .......................................................................................................................... 2
4-1. Selling Point Descriptions ............................................................................................................... 3
5. SPECIFICATIONS .......................................................................................................................... 5
5-1. Specifications.................................................................................................................................. 5
5-2. Optional Accessories ...................................................................................................................... 6
6. COMPARISONS WITH SIMILAR PRODUCTS ............................................................................ 10
6-1. Specification Comparisons ........................................................................................................... 10
6-2. Tightening Torque ..........................................................................................................................11
6-3. Number of Bolts Driven................................................................................................................. 14
7. PRECAUTIONS IN SALES PROMOTION ................................................................................... 15
7-1. Safety Instructions ........................................................................................................................ 15
7-2. Tightening Torque Inspection Prior to Operation .......................................................................... 17
7-3. Tightening Torque Variation .......................................................................................................... 17
7-4. Suggestions and Precautions for the Efficient Use of the Charger............................................. 18
8. OTHER PRECAUTIONS .............................................................................................................. 19
9. REPAIR GUIDE ............................................................................................................................ 20
9-1. Precautions in Disassembly and Reassembly.............................................................................. 20
9-2. Precautions in Disassembly and Reassembly of Battery Charger ............................................... 26
10. STANDARD REPAIR TIME (UNIT) SCHEDULES ..................................................................... 27
Assembly Diagram for WR 14DH ........................................................................................................ 28
CONTENTS
Page

--- 1 ---
1. PRODUCT NAME
Hitachi Cordless Impact Wrench, Model WR 14DH
2. MARKETING OBJECTIVE
The current cordless impact wrenches Model WR 8DH (9.6 V) and WR 12DH (12 V) are well reputed on the
market. Now, the new Model WR 14DH (14.4 V) is being introduced to respond to users' requests for a more
powerful impact wrench with higher torque. The Model WR 14DH has the following key features:
1. Higher torque: 147 Nm (25% higher than Model WR 12DH)
2. Externally accessible carbon brushes for longer motor life
3. Compact body and lower center height 27 mm (1-1/16")
4. User-friendly and optimally balanced design thanks to the strap, brake and grip rubber
The Model WR 14DH broadens our lineup of cordless impact wreches from 9.6 V to 14.4 V. Vigorous sales
promotion of the impact wrench series is anticipated in various applications such as construction, electric
equipment, sanitary facilities, and motor vehicles.
3. APPLICATIONS
Construction industry: Assembly of scaffolding, roofing, 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, shipbuildng, agricultural machinery and
tools, industrial machines, etc.
Service industry: General repair work; installation of advertising signs, automobile repair, assembly of garages
and carports storage sheds, etc.
Various other assembly, construction or repair facilities.

--- 2 ---
4. SELLING POINTS
Model WR 14DH Cordless Impact Wrench
147 N•m
(1,500 kgf•cm, 1,302 in-lbs.)
Higher tightening torque
Convenient holes for hanging
Externally accessible carbon
brushes for longer motor life
Well-balanced handle
for less-fatigue
Comfort grip rubber
Variable speed switch with electric
brake for efficient operation
Compact and lightweight
(2.2 kg, 4.85 lb.)
223 mm (8-25/32")
27 mm
(1-1/6")

--- 3 ---
*: This value indicates the symmetric position of C with respect to the reference line of the Model WR 14DH.
Remarks
(1) The Model WR 14DH is easy to operate because the switch position is near to and parallel with the work
center line.
(2) The body is well balanced because the center of gravity is positioned near the reference lines.
4-1. Selling Point Descriptions
(1) Compact and lightweight, and well-balanced handle
L: Overall length 223 mm (8-25/32")
Reference lines
B: Switch position
19.4 mm (3/4") C: Position of
center of gravity
27 mm
(1-1/16")
A: Center height
D: Angle of handle
Work center line
Center of gravity
10˚
HITACHI
WR 14DH
Weight
Catalog weight kg
C
L Overall length mm
Hitachi
Maker •Model
A Center height mm
B Switch position mm
C Position of center of gravity mm
D Angle of handle ˚
Actual weight kg
WR 14DH
223 (8-25/32")
27 (1-1/16")
47.2 (1-53/64")
19.4 (3/4")
10
WH 12D
230 (9-3/64")
33.5 (1-5/16")
47.5 (1-53/64")
19 (23/32")
5
WR 12DH
176 (6-15/16")
26 (1-1/64")
43 (1-11/16")
32.5 (1-1/4")
5
2.2 (4.85 lbs.)
2.22 (4.89 lbs.)
2.3 (5.07 lbs.)
2.38 (5.25 lbs.)
1.7 (3.75 lbs.)
1.73 (3.81 lbs.)
225 (8-53/64")
32 (1-1/4")
46 (1-51/64")
31 (1-7/32")*
10
1.2 (2.65 lbs.)
(Main body only)
1.29 (2.84 lbs.)
(Main body only)
Item

--- 4 ---
(2) Improved motor performance
The Model WR 14DH has high power thanks to the fan-cooled DC magnet motor. They have better heat-
resistance because the built-in fan enhances cooling efficiency. Their motors have replaceable carbon
brushes, and the service life of the carbon brush has been extended by increasing its size by about 70%
(volume) compared to our previous model.
(3) Construction of replaceable carbon brushes
The carbon brush can be easily removed from the motor with a flat-blade screwdriver as shown in Fig. 2, and
can also be easily and securely mounted to the motor by hooking the claw of the carbon brush on the
connecting portion on the outside of the brush tube.
(4) Safe handle shape
Compared with the previous WH 12D, the housing of the Model WR 14DH does not produce gaps caused by
vibration because front and rear grip inserts [part name: grip (R) and grip (F), made of rubber] are provided at
the juncture of the handle, and the housing is secured with two screws at the center of the handle to prevent
the operator's hand from being pinched. Furthermore, the rear portion of the housing is shaped upward so not
to interfere with the base of the operator's thumb.
(5) Convenient holes for suspending
The Model WR 14DH has two holes on the hammer case. These holes are convenient for hanging the Model
WR 14DH from a hook.
Claw of
carbon brush Colloar of
carbon brush
Fig. 1
Connecting portion at the
outside of brush tube
Fig. 2 Fig. 3
Holes

--- 5 ---
5. SPECIFICATIONS
5-1. Specifications
Type of motor
Ordinary bolt M8 --- M16 (5/16" --- 5/8")
High-strength bolt M8 --- M12 (5/16"--- 15/32")
Tightening torque 147 N•m (1,500 kgf•cm, 1,302 in-lbs.) *1
12.7 mm (1/2") square drive
Fan cooled DC magnet motor
Tip condition
Enclosure
Type of switch
Handle configuration
No-load rotational speed
Center height
Main body
Battery
Battery (Type EB 1430H)
Weight
Capacity
Impact rate
Overall length x height
Main body: Polyamide resin •••••••••••••••••••••••• Housing
Aluminum alloy die casting •••••••• Hammer case
Storage batery: Polyamide resin
Charger: ABS resin (black)
Trigger switch with forward/reverse changeover pushing button (with brake and variable)
T-type
0 --- 2,300 /min.
0 --- 3,200 /min.
2.2 kg (4.85 lbs.) (Includes battery) *2
0.82 kg (1.81 lbs.)
223 mm (8-25/32") x 239 m (9-13/32")
27 mm (1-1/16")
Item Cordless impact wrench WR 14DH
Battery (Type EB 14B) Sealed cylindrical nickel-cadmium batteries
Nominal voltage: DC 14.4 V
Nominal life: Charging/discharging approximately 1,000 cycles (in case of Model
UC 14YF2)
Nominal capacity: 2.0 Ah
Sealed cylindrical nickel-cadmium batteries
Nominal voltage: DC 14.4 V
Nominal life: Charging/discharging approximately 500 cycles (in case of Model
UC 14YF2)
Nominal capacity: 3.0 Ah
Sealed power source: Single-phase AC, 50/60 Hz
Voltage: Depending on the order specification
Power input: 44 W
Charging system: constant current charge with full wave phase control
Overcharge protection system: (1) Battery voltage detection ( 2V system)
(2) Battery surface temperature detection
(thermostat or thermistor)
(3) 120 minute timer
Output voltage: 7.2 V --- 14.4 V
Output current: 1.9 A
Charging time: Approx. 60 minutes (for B-type storage battery at 20˚C (68˚F))
Approx. 90 minutes (for H-type storage battery at 20˚C (68˚F))
Product weight: 1.3 kg
Operable ambient temperature range: 0˚C --- 40˚C (32˚F --- 104˚F)
The maximum allowable temperature of the EB 14B type battery is 60˚C (140˚F)
and the EB 1430H type battery is 45˚C (113˚F).
Charger (UC 14YF2)
*1: This torque is based on tightening an M16 (5/8") bolt (F10T) for 3 seconds with a hexagonal socket.
*2: Main body does not include accessory tools (hexagonal bit, etc.).
Model

--- 6 ---
Red pilot lamp
remains lit or flashes
WR 14DH
Green pilot lamp is lit.
Prior to charging
During charging
Charging completed
Charging not possible
High battery
temperature
Blinks
Lit
Blinks
Flickers
Lit
0.5 sec ON, 0.5 sec OFF
Stays ON constantly
0.5 sec ON, 0.5 sec OFF
0.1 sec ON, 0.1 sec OFF Storage battery or
charger is faulty.
Charging not possible
because storage battery
temperature is too high.
Pilot to lamp indications (UC 14YF2)
5-2. Optional Accessories
(1) Combination of optional accessories and applications
Square drive dimension:
12.7 m (1/2" square)
<Tools>
<Applicable screws> <Connecting tools>
Hex. socket hd. bolt and nut
Hex. socket hd. bolt
Socket for ducting
Hex. socket
Square drive dimension:
12.7 mm (1/2" square)
Corner attachment
Extension bar
Universal joint
Stays ON constantly

--- 7 ---
(2) Optional accessories for the Model WR 14DH
Each dimension and applicable bolt for each hexagon socket
Shape B Shape DShape C
L
L1Sq
H
L
L1
L
L1
Each dimension and applicable bolt for each long socket
Square
drive
dimension
Sq
12.7 mm
(1/2")
40
(1-9/16") 8 (5/16") 20 (25/32")
40
(1-9/16") 9 (11/32") 25 (1")
40
(1-9/16") 9 (11/32") 25 (1")
32
(1-1/4") 8 (5/16") 28 (1-3/32")
34
(1-11/32") 9 (11/32") 28 (1-3/32")
36
(1-13/32") 10 (3/8") 32 (1-1/4")
40
(1-9/16") 14 (9/16") 35 (1-3/8")
40
(1-9/16") 15 (9/16") 38 (1-1/2")
--- M 8
(5/16") --- ---
--- --- M 10
(3/8") ---
--- M 10
(3/8") M 12 (15/32") W 3/8"
--- M 12
(15/32") M 14 (9/16")
--- --- ---
M 12
(15/32") M 14 (9/16") M 16 (5/8") ---
M 16
(5/8") M 18 (23/32")
Part Name
Hexagon
socket
10 mm
22 mm
21 mm
19 mm
17 mm
14 mm
13 mm
12 mm
24 mm
Code No.
873632
873626
873624
873536
873539
873540
944291
873627
873629
Shape
B
B
B
D
D
C
C
B
D
Dihedral
width
H (mm)
10
(3/8")
12
(15/32")
19
(23/32")
17
(21/32")
14
(9/16")
13
(1/2")
22
(7/8")
21
(53/64")
24
(15/16")
--- --- M 8
(5/16") W 5/16"
W 7/16"
W 1/2"
--- M 6
(1/4") ---
Nominal diameter of applicable bolts
ISO
(high-
strength)
ISO
(ordinary) ISO
(small
type)
Inch
screw
--- 40
(1-9/16") 8 (5/16") 18 (23/32")
Socket primary dimensions
(mm)
LL
1D1
L
L1
Sq
H
Shape B Shape D
D
1
(dia.)
D
1
(dia.)
L2
L
L1
L2

--- 8 ---
Square
drive
dimension
Sq
12.7 mm
(1/2")
Part Name
Long
socket
Code No.
--- ---
Nominal diameter of applicable bolts
ISO
(high-
strength)
ISO
(ordinary) ISO
(small
type)
Inch
screw Shape
Dihedral
width
H (mm)
12
(15/32")
13
(1/2")
19
(23/32")
17
(21/32")
17
(21/32")
14
(9/16")
21
(53/64")
19
(23/32")
21
(53/64")
Socket primary dimensions
(mm)
LL
1L2
12 mm
21 mm
19 mm
19 mm
17 mm
17 mm
14 mm
13 mm
21 mm
955139
955150
955142
955149
955140
955141
955138
955143
955151
M 8
(5/16")
D1
W 5/16"
21
(53/64")
22
(7/8")
24
(15/16")
--- M 8
(5/16") --- ---
--- --- M 10
(3/8") ---
--- M 10
(3/8") M 12 (15/32") W 3/8"
--- M 10
(3/8") M 12 (15/32") W 3/8"
--- M 12
(15/32") M 14 (9/16") W 7/16"
--- M 12
(15/32") M 14 (9/16") W 7/16"
--- --- --- W 1/2"
--- --- --- W 1/2"
--- --- ---
M 12
(15/32") M 14
(9/16") M 16 (5/8") ---
--- M 16
(5/8") M 18 (23/32")
D
D
D
B
B
B
D
B
B
B
B
D
22 mm
21 mm
24 mm
991480
955144
955146
52
(2-3/64") 20 (25/32") 34 (1-11/32") 20 (25/32")
52
(2-3/64") 20 (25/32") 34 (1-11/32") 21.5 (53/64")
52
(2-3/64") 20 (25/32") 34 (1-11/32") 22 (7/8")
52
(2-3/64") 24
(15/16") 34 (1-11/32") 25 (1")
75
(2-15/16") 24
(15/16") 57 (2-1/4") 25 (1")
52
(2-3/64") 24
(15/16") 34 (1-11/32") 28 (1-3/32")
52
(2-3/64") 24
(15/16")
24
(15/16") 28 (1-3/32")
75
(2-15/16") 24
(15/16") 57 (2-1/4") 31 (1-7/32")
W 1/2" 125
(4-47/51") 24
(15/16") 107 (4-7/32") 31 (1-7/32")
34
(1-11/32") 34
(1-11/32")
34
(1-11/32")
52
(2-3/64")
52
(2-3/64") 24
(15/16") 32.5 (1-9/32")
31
(1-7/32")
34
(1-11/32")
57
(2-1/4")
75
(2-15/16")
25
(63/64")
Plus hd.
driver bit
No.2
Plus hd.
driver bit
No.3
45 (1-25/32")
70 (2-3/4")
45 (1-25/32")
70 (2-3/4")
955229
955654
955230
955655
Part name Overall length
(mm) Code No.
Bit adapter (Code No. 991476)
Extension bar [Overall length 100 mm (3-15/16")] (Code No. 873633)
Universal joint (Code No. 992610)
Socket ass'y for duct
EW-14R corner attachment (Code No. 9329-9001)
Dihedral width of
applicable bolts Code No.
12 (15/32")
13 (1/2")
14 (9/16")
993658
992613
992615
6.35 mm (1/4") 45 mm (1-25/32") 12.7 mm (1/2")
13.5 mm dia.
(17/32")