Hitachi WH 12DAF Manual

POWER TOOLS

TECHNICAL DATA

AND

SERVICE MANUAL

CORDLESS IMPACT DRIVER

WH 12DAF

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

LIST No. F880 Feb. 2003

MODEL

WH 12DAF

REMARK:

Throughout this TECHNICAL DATA AND 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:

Symbol Utilized Competitor

Company Name Model Name

C MAKITA 6914D

P DeWALT DW977K

Page

CONTENTS

1. PRODUCT NAME............................................................................................................................. 1

2. MARKETING OBJECTIVE ............................................................................................................... 1

3. APPLICATIONS................................................................................................................................ 1

4. SELLING POINTS ............................................................................................................................ 2

4-1. Selling Point Descriptions ................................................................................................................. 2

5. SPECIFICATIONS ............................................................................................................................ 3

5-1. Specifications.....................................................................................................................................3

5-2. Optional Accessories .........................................................................................................................5

6. COMPARISONS WITH SIMILAR PRODUCTS ................................................................................ 6

6-1. Specification Comparisons ................................................................................................................6

6-2. Tightening Torque ..............................................................................................................................7

6-3. Number of Screws or Bolts Driven.....................................................................................................9

7. PRECAUTIONS IN SALES PROMOTION ..................................................................................... 10

7-1. Safety Instructions ...........................................................................................................................10

7-2. Tightening Torque Inspection Prior to Operation .............................................................................12

7-3. Tightening Torque Variation .............................................................................................................12

7-4. Suggestions and Precautions for the Efficient Use of the Charger and Storage Batteries..............14

8. OTHER PRECAUTIONS ................................................................................................................ 14

9. REPAIR GUIDE .............................................................................................................................. 15

9-1. Precautions in Disassembly and Reassembly.................................................................................15

9-2. Precautions in Disassembly and Reassembly of Battery Charger ..................................................21

10. STANDARD REPAIR TIME (UNIT) SCHEDULES ....................................................................... 22

Assembly Diagram for WH 12DAF

--- 1 ---

1. PRODUCT NAME

Hitachi Cordless Impact Driver, Model WH 12DAF

2. MARKETING OBJECTIVE

The current high-grade Model WH 12DM is obtaining high evaluation in the cordless impact driver market that is

expanding especially in Europe. The new Model WH 12DAF is a popular version that provides an excellent cost/

performance ratio, inheriting the well-reputed features of the Model WH 12DM such as soft grip and belt hook.

Vigorous sales promotion is anticipated with the introduction of the new Model WH 12DAF ahead of the

competitors.

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

--- 2 ---

4. SELLING POINTS

Soft-grip handle

Convenient belt hook

Variable speed reversible

switch with electric brake

Max. torque 88 N•m

(780 in-lbs.)

4-1. Selling Point Descriptions

(1) Max. torque 88 N•m (780 in-lbs)

The maximum torque of the Model WH 12DAF is 88 N•m (780 in-lbs.) thanks to the optimum striking design

while maintaining high mechanical strength with the durable die-casting aluminum hammer case, etc.

(2) Soft-grip handle

The grip of the Model WH 12DAF is soft, slip-resistant and comfortable thanks to the soft resin (elastomer)

covered on the handle.

(3) Convenient belt hook

A hook is very convenient if there is no place to put the impact driver temporarily. Although various kinds of

hooks are on the market, there is a user demand for a standard accessory hook. To cope with this demand,

the Model WH 12DAF is equipped with the hook having the following features as a standard accessory.

The hook can be quickly slide out and can be slide in when not needed.

The hook is mountable on either side to cope with the use by either right-handed persons and left-handed

persons. The mounting position can be changed by using a flat-blade screwdriver or a coin.

The angle of the hook is adjustable in five steps (0, 20, 40, 60 and 80˚). The hook can be adjusted to the

optimum position according to the weight of the bit in use.

Durable die-casting aluminum hammer case

--- 3 ---

5. SPECIFICATIONS

5-1. Specifications

Capacity Small screw M4 --- M8 (5/32" --- 5/16")*1

Ordinary bolt M4 --- M12 (5/32" --- 15/32")

High-strength bolt M4 --- M10 (5/32" --- 3/8")

Tightening torque 88 N•m (900 kgf•cm, 780 in-lbs.)*2

Tip condition 6.35 mm (1/4") bit holder

Type of motor Fan cooled DC magnet motor

Enclosure Body ••••••••••••Glassfiber reinforced polyamide resin (green)

and themoplastic elastomer (charcoal gray)

Aluminum alloy die casting •••••••••••••••••••••••••••••••••••• Hammer case

Battery •••••••• ABS resin (black)

Charger •••••• ABS resin (black)

Type of switch

Trigger switch with push button for forward and reverse rotation changeover (with brake)

Handle configuration T-type

No-load rotation speed 0 --- 2,200/min

Impact rate 0 --- 2,900/min

Main body 1.6 kg (3.5 lbs.) (with battery EB 1214L/EB 1220BL/EB 1222HL)

1.5 kg (3.3 lbs.) (with battery EB 1212S)

Battery 0.6 kg (1.3 lbs.) (with battery EB 1214L/EB 1220BL/EB 1222HL)

0.5 kg (1.1 lbs.) (with battery EB 1212S)

Overall length x height 176 mm (6-15/16") x 226 mm (8-7/8") (with battery EB 1214L/EB 1220BL/EB 1222HL)

176 mm (6-15/16") x 217 mm (8-1/2") (with battery EB 1212S)

Center height 26 mm (1-1/64")

Battery

(Type EB 1212S/

EB 1214L)

Sealed cylindrical nickel-cadmium battery

Nominal voltage •••••••• DC 12V

Nominal life •••••••••••••• Charging/discharging: approximately 300/500 times

(in case of Model UC 12SD or UC 24YFA)

Nominal capacity •••••••

1.2 Ah/1.4 Ah

Weight

•••••• Housing

Battery

(Type EB 1220BL) Sealed cylindrical nickel-cadmium battery

Nominal voltage •••••••• DC 12V

Nominal life •••••••••••••• Charging/discharging: approximately 1,000 times

(in case of Model UC 24YFA)

Nominal capacity •••••••

2.0 Ah

Battery

(Type EB 1222HL) Sealed cylindrical nickel-metal hydride battery

Nominal voltage •••••••• DC 12V

Nominal life •••••••••••••• Charging/discharging: approximately 500 times

(in case of Model UC 24YFA)

Nominal capacity •••••••

2.2 Ah

--- 4 ---

*1: In the case of tapping screws and wood screws, a minimum of M3 (1/8") is possible.

*2: This torque is based on tightening an M12 (15/32") bolt (strength grade: 12.9) for 3 sec. with a hexagon socket.

Overcharge prevention circuit:

A thermostat monitors the surface temperature of the battery and on detecting the

temperature rise which occur on completion of charging, automatically turns off the

unit to prevent the battery from overcharge.

Input capacity: 51 W

Indication method: Pilot lamp indicator of battery charging

Function: On •••••••••••••••••• During charging

Off •••••••••••••••••• Charging completed

Charger

(Model UC 12SD)

Overcharge protection system: (1) Battery voltage detection ( 2V system)

(2) Battery surface temperature detection

(thermostat or thermistor)

(3) 120-minute timer

Input capacity: 90 W

Charging time:

Approx. 40 minutes [for type EB 1212S/EB 1214L battery at 20˚C (68˚F)]

Approx. 50 minutes [for type EB 1220BL battery at 20˚C (68˚F)]

Approx. 55 minutes [for type EB 1222HL battery at 20˚C (68˚F)]

Operable ambient temperature range: 0˚C --- 40˚C (32˚F --- 104˚F)

The maximum allowable temperature of the type EB 1212S, EB 1214L and EB 1220BL

battery is 60˚C (140˚F) and the type EB 1222HL battery is 45˚C (113˚F).

Charger

(Model UC 24YFA)

Weight Net Main body (with battery EB 1214L/EB 1220BL/EB 1222HL) ••••••••••••• 1.6 kg (3.5 lbs.)

(with battery EB 1212S) ••••••••••••••••••••••••••••••••••••••••••••••••• 1.5 kg (3.3 lbs.)

Charger unit (UC 12SD) (including cord) ••••••••••••••••••••••••••••••••••••••••• 1.4 kg (3.1 lbs.)

Charger unit (UC 24YFA) (including cord) ••••••••••••••••••••••••••••••••••••••• 0.6 kg (1.3 lbs.)

Gross WH 12DAF (SSK) (with extra battery) •••••••••••••••••••••••••••••••••••••••••••• 5.1 kg (11.3 lbs.)

WH 12DAF (SSK) •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 4.6 kg (10.2 lbs.)

WH 12DAF (SLSK) (with extra battery) •••••••••••••••••••••••••••••••••••••••••• 5.3 kg (11.7 lbs.)

WH 12DAF (SLSK) •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 4.7 kg (10.4 lbs.)

WH 12DAF (BLFK) (with extra battery) •••••••••••••••••••••••••••••••••••••••••• 4.5 kg ( 9.9 lbs.)

WH 12DAF (HLFK) •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 3.9 kg ( 8.6 lbs.)

Standard accessories

SSK (with extra battery)

SSK

SLSK (with extra battery)

SLSK

BLFK (with extra battery)

HLFK

Charger

UC 12SD x 1

UC 24YFA x 1

Battery

EB 1212S x 2

EB 1212S x 1

EB 1214L x 2

EB 1214L x 1

EB 1220BL x 2

EB 1222HL x 1

Case

x 1

--- 5 ---

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

Stays ON constantly

Pilot lamp indications (Model UC 24YFA)

Red pilot lamp

remains lit or flashes

Green pilot lamp is lit

Storage battery or charger

is faulty.

Charging not possible

because storage battery

temperature is too high.

5-2. Optional Accessories

(1) Optional accessories

Plus driver bit

50 mm (2")

Bit No.

No. 2

No. 3

Code No.

992671

992672

Hexagon socket

Stamped figures

9961778 (5/16")65 (2-9/16")8

Stamped figures

5 mm Hexagon socket

Part Name L

(mm) B

(mm) Code No.

98532910 (3/8")65 (2-9/16")106 mm Hexagon socket

99617812 (15/32")65 (2-9/16")125/16" Hexagon socket 99617913 (1/2")65 (2-9/16")138 mm Hexagon socket

99618014 (9/16")65 (2-9/16")1410 mm Hexagon socket (small type)

99618116 (5/8")65 (2-9/16")1610 mm Hexagon socket 99618217 (21/32")65 (2-9/16")1710 mm Hexagon socket

99619721 (53/64")166 (6-17/32")211/2" Hexagon long socket

Woodworking drill bit (Code No. 959183)

14 mm dia.

(35/64")

83 mm (3-17/64")

9926897 (1/4")65 (2-9/16")74 mm Hexagon socket

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.

--- 6 ---

EB 1220BL

•••••• Approx. -/50 min.

6. COMPARISONS WITH SIMILAR PRODUCTS

6-1. Specification Comparisons

M4 --- M8 (5/32" --- 5/16")

HITACHI

WH 12DAF

Maker

Model

Item

Capacity Small screw

M4 --- M12 (5/32" --- 15/32")

Ordinary bolt

M4 --- M10 (5/32" --- 3/8")High-strength bolt

(780 in-lbs., 900 kgf•cm)

Max. tightening torque N•m

0 --- 2,200

No-load rotation speed /min

0 --- 2,900

Impact rate /min

Main body weight kg

Overall length mm 176 (6-15/16")

Center height mm

Equipped

Driver chuckTool tip mounting system

Switch

DC magnet

Type of motor

Voltage

1.2/1.4/2.0/2.2

Battery

Type EB 1212S/EB1214L/

EB 1220BL/EB 1222HL

Nominal capacity Ah

UC 12SD/UC 24YFA

Nominal voltage V

EB 1212S, EB 1214L

•••••• Approx. 60/40min.

Model

min. 12/7.2 --- 24

Recharging voltage

Plastic case

Charger

(UC 12SD/UC 24YFA)

Standard accessories

Charger

Overall height mm

26 (1-1/64")

1.6 (3.5 lbs.)

: With EB 1214L/

EB 1220BL/

EB 1222HL

1.5 (3.3 lbs.)

: With EB 1212S

226 (8-7/8")

: With EB 1214L/

EB 1220BL/

EB 1222HL

217 (8-1/2")

: With EB 1212S

Variable speed

Electric brake Equipped

Charging time

EB 1222HL

•••••• Approx. -/55 min.

*1: In the case of tapping screws and wood screws, a minimum of M3 is possible.

*2: Max. tightening torque is based on tightening an M12 (15/32") bolt (strength grade: 12.9) for 3 sec. with a hexagon socket.

*3: Main body weight does not include accessory tools (hexagon bit, etc.).

*4: This types of battery could not charge by Model UC 12SD.

M4 --- M8 (5/32" --- 5/16")

M5 --- M12 (3/16" --- 15/32")

M5 --- M10 (3/16" --- 3/8")

100(885 in-lbs.,

1020 kgf•cm)

0 --- 2,300

0 --- 3,000

167 (6-37/64")

Equipped

Driver chuck

DC magnet

2.0/3.0

EB 1220BL/EB 1230HL

UC 14YF2

EB 1220BL

••••••• Approx. 60 min.

7.2 --- 14.4

Plastic case

Charger (UC 14YF2)

26 (1-1/64")

1.6 (3.5 lbs.)

226 (8-7/8")

Equipped

EB 1230HLL

••••••• Approx. 90 min.

WH 12DM

M4 --- M8 (5/32" --- 5/16")

M5 --- M12 (3/16" --- 15/32")

M5 --- M10 (3/16" --- 3/8")

98 (870 in-lbs.,

1,000 kgf•cm)

0 --- 2,200

0 --- 3,000

176 (6-15/16")

Equipped

Driver chuck

DC magnet

2.0

1222

DC 1411

60 min.

7.2 --- 14.4

Plastic case

Charger

26 (1-1/64")

1.7 (3.8 lbs.)

232 (9-1/8")

Equipped

96 (850 in-lbs.,

978 kgf•cm)

0 --- 2,000

0 --- 2,600

220 (8-21/32")

Equipped

Driver chuck

DC magnet

1.7

DW9071

DW9107

60 min.

7.2 --- 14.4

Plastic case

Charger

42 (1-21/32")

2.1 (4.6 lbs.)

241 (9-1/2")

Equipped

--- 7 ---

6-2. Tightening Torque

6-2-1. 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. 1 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 for the screw (mm)

p: Recommended axial tightening force to be applied to the screw (kgf)

p=rated axial stress (kgf/cm2) x 0.8 x effective sectional area of the thread (mm2)

K: Torque coefficient (0.17)

Strength grade and rated axial stress of threads

Strength grade

Rated axial stress (kgf/mm2)

Material

Heat treatment

4.8 6.8 8.8 12.9

29.1 43.7 58.2 95

Mild steel Alloy steel including Ni, Mn, Cr, etc.

None Processed-hard material

Diameter and effective sectional areas of threads

Kind of thread (x pitch)

Effective sectional area of

thread (mm2)

M5 x 0.8 mm

(3/16")

14.2

M6 x 1 mm

(1/4")

20.1

M8 x 1.25 mm

(5/16")

36.6

M10 x 1.5 mm

(3/18")

58.0

M12 x 1.75 mm

(15/32")

84.3

M14 x 2 mm

(9/16")

115

Thread diameter and appropriate tightening torque

Fig. 1

Strength grade 12.9

(high-strength bolt)

Strength grade 8.8

(high-strength bolt)

Strength grade 6.8

(ordinary bolt)

Strength grade 4.8

(ordinary bolt)

(3/16")

(1/4")

(5/16")

(3/8")

(15/32")

(9/16")mm

200

(19.6 N

•

m, 14 ft-lbs.)

400

(39.2 N

•

m, 29 ft-lbs.)

600

(58.8 N

•

m, 43 ft-lbs.)

800

(78.4 N

•

m, 58 ft-lbs.)

1000

(98 N

•

m, 72 ft-lbs.)

1200

(117.6 N

•

m, 86 ft-lbs.)

(kgf•cm)

Thread diameter

Appropriate tightening torque

Table 1

Table 2

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