Hitachi WR 14VB Technical Data And Service Manual

Brand: Hitachi

Model: WR 14VB

Type: Technical Data And Service Manual

Hitachi WR 14VB is a powerful impact wrench suitable for a wide range of applications, including:

Tightening and loosening bolts and nuts
Tightening anchor nuts
Assembly of scaffolding
Tightening/loosening of formwork bolts
Tightening/loosening of bolts for automobiles, rolling stock, shipbuilding, agricultural machinery and tools, construction machinery, etc.
Assembly and installation of electric equipment, plumbing facilities, air conditioning (duct assembly etc.), sanitary fixtures and various other facilities
Tightening of bolts for lightweight steel construction such as prefabricated houses

Hitachi WR 14VB is a powerful impact wrench suitable for a wide range of applications, including:

Tightening and loosening bolts and nuts
Tightening anchor nuts
Assembly of scaffolding
Tightening/loosening of formwork bolts
Tightening/loosening of bolts for automobiles, rolling stock, shipbuilding, agricultural machinery and tools, construction machinery, etc.
Assembly and installation of electric equipment, plumbing facilities, air conditioning (duct assembly etc.), sanitary fixtures and various other facilities
Tightening of bolts for lightweight steel construction such as prefabricated houses

TECHNICAL DATA

AND

SERVICE MANUAL

IMPACT WRENCH

WR 14VB

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

LIST No. E706 Feb. 2005

MODEL

WR 14VB

Hitachi



Power Tools

REMARK:

Throughout this TECHNICAL DATA AND SERVICE MANUAL, a symbol is

used in the place of company name and model name of our competitor.

The symbol utilized here is as follows:

Symbol Utilized

Competitor

Company Name

Model Name

C MAKITA

TW0200

Page

CONTENTS

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

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

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

4. SELLING POINTS .......................................................................................................................... 1

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

5. SPECIFICATIONS .......................................................................................................................... 4

5-1. Specifications .................................................................................................................................. 4

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

6. COMPARISONS WITH SIMILAR PRODUCTS .............................................................................. 7

6-1. Specification Comparisons ............................................................................................................. 7

6-2. Tightening Torque ........................................................................................................................... 8

6-3. Appropriate Tightening Torque for Bolts .......................................................................................... 9

6-4. Tightening Torque Characteristics when Using An Extension Cord .............................................. 10

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

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

7-2. Tightening Torque Inspection Prior to Operation ........................................................................... 11

7-3. Tightening Torque Variation ........................................................................................................... 11

7-4. Temperature Rise ........................................................................................................................ 12

8. OTHER PRECAUTIONS .............................................................................................................. 12

9. REPAIR GUIDE ............................................................................................................................ 13

9-1. Disassembly ................................................................................................................................. 13

9-2. Reassembly .................................................................................................................................. 16

9-3. Insulation Tests ............................................................................................................................. 18

9-4. No-load Current Value .................................................................................................................. 19

10. STANDARD REPAIR TIME (UNIT) SCHEDULES ..................................................................... 20

Assembly Diagram for WR 14VB

--- 1 ---

1. PRODUCT NAME

Hitachi Impact Wrench, Model WR 14VB

2. MARKETING OBJECTIVE

Twenty years have passed since the sales start of the conventional Model WH 14 and the demand has been

reduced. The new impact wrench Model WR 14VB is the upgraded version of the Model WH 14, featuring the

class-top tightening torque by the computer-analyzed optimum impacting operation, compact body, and durability

in order to enter the market of wood fastening tools. The Model WR 14VB is powerful and novel thanks to the 3-D

CAD engineering as well as the double-layer molding and improved handle grip to plainly differentiate it from the

competitors. Please expand our market share with this Model WR 14VB.

3. APPLICATIONS

Tightening/loosening of bolts, nuts, etc.

Tightening anchor nuts

[Applicable markets]

Wooden construction industry: Tightening of bolts, anchor nuts, etc.

Construction industry: Assembly of scaffolding, tightening/loosening of formwork bolts

Manufacturing industry: Tightening/loosening of bolts for automobiles, rolling stock, shipbuilding, agricultural

machinery and tools, construction machinery, etc.

Utility industry: Assembly and installation of electric equipment, plumbing facilities, air conditioning (duct

assembly etc.), sanitary fixtures and various other facilities

Others: Tightening of bolts for lightweight steel construction such as prefabricated houses

4. SELLING POINTS

Stronger screw connection

thanks to the cylindrical housing

containing an insert screw

Housing is covered with

elastomer entirely.

Powerful motor

Higher durability thanks to

the metallic bearing bushing

Class-top tightening torque

Slip-resistant and comfortable

soft grip handle

Speed change lever is

selectable between high or

low speed according to the

operation.

Forward/reverse

changeover pushing

button

Steplessly variable speed

trigger switch

Grip end is shaped like a

finger stopper for portability

--- 2 ---

4-1. Selling Point Descriptions

(1) Class-top tightening torque

With the powerful motor and the computer analysis, the Model WR 14VB gives optimum impact at

tightening screws and the tightening torque is the highest level in this class.

(2) While the conventional Model WH 14 has the resin housing directly secured with screws, the Model WR

14VB has the housing containing a brass insert screw for secure screw connection with the aluminum

hammer case (the screw tightening torque is 2 times greater than the Model WH 14). Thus the Model

WR 14VB has higher durability.

Hammer case

(aluminum)

Screw (M5 bolt)

WR 14VB

WH 14

Screw (M5 bolt)

Housing (resin)

Insert screw (brass)

Inner cover

(aluminum)

Hammer case

(aluminum)

Inner cover

(aluminum)

Housing (resin)

--- 3 ---

(3) Higher durability thanks to the metallic bearing bushing

A metallic bearing bushing is built in and the outside is covered with resin tail cover for higher durability.

The resin tail cover secures the bearing bushing and also prevents the CB cap from loosening.

Bearing bushing (metal)

(4) Slip-resistant and comfortable soft grip handle

The grip of the Model WR 14VB is soft, slip-resistant and comfortable thanks to the soft material (elastomer

resin) covered on the handle. The Model WR 14VB gives minimum fatigue to the operator's hand even if it is

operated for a long time.

(5) Housing is covered with elastomer entirely

The Model WR 14VB gives no scratch on the floor etc. where it is placed because the housing is covered with

elastomer entirely. In addition, the elastomer-covered housing prevents the Model WR 14VB from slipping on

a slanted surface such as a roof.

(6) Steplessly variable speed trigger switch and speed change lever

The speed can be controlled by varying the amount that the trigger switch is pulled from 0 to 2,300 rpm

steplessly. In addition, the speed change lever is selectable between high or low speed for the tightening

torque suitable for the operation. (Refer to "6-2. Tightening Torque".)

(7) Grip end is shaped like a finger stopper for portability

The grip end is thickened to make it as a finger stopper for portability.

CB cap Tail cover (resin)

--- 4 ---

Standard accessory

5. SPECIFICATIONS

5-1. Specifications

Model

WR 14VB

Capacity

Item

Ordinary bolt M10 (3/8") to M18 (23/32")

High-strength bolt M8 (5/16") to M14 (9/16")

Tightening torque

250 N

•

m 2,550 kgf

•

cm (2,210 in-lbs.)

Tip condition

12.7 mm (1/2") (Width across flat of the socket mounting portion)

Type of motor

Single phase AC commutator motor

Enclosure

Polycarbonate resin + Elastomer ...................................................... Housing

Polycarbonate resin .......................................................................... Handle cover

Polyamide resin ................................................................................ Tail cover

Aluminum die casting ........................................................................ Hammer case

Rubber .............................................................................................. Bumper

Type of switch

Trigger switch with forward reverse changeover pushing button

Power consumption

420 W

Full-load current

4.4 A

Impact rate

Low speed: 0 to 2,100 min

-1

High speed: 0 to 2,800 min

-1

Main body

2.2 kg (4.8 lbs.) (Excludes cord and socket)

Packaged

4.5 kg (9.9 lbs.)

Overall length x height

248 mm x 231 mm (9-49/64" x 9-3/32")

Center height

35 mm (1-3/8")

Package

Cord

Side handle (Excludes U.S.A. and Canada)

Plastic case (For certain areas)

Weight

Handle configuration

T-type

No-load rotation speed

Low speed: 0 to 1,800 min

-1

(0 to 1,800 revolutions/minute)

High speed: 0 to 2,300 min

-1

(0 to 2,300 revolutions/minute)

Type

Nominal cross-

sectional area

Outside diameter

Length

Corrugated fiberboard box

Plastic case (For certain areas)

2-core cabtire cable

0.75 mm

7.4 mm

5 m

Insulation method Double insulation

Carbon brush

Mounted outside

--- 5 ---

Shape B Shape C Shape D

5-2. Optional Accessories

(1) Each dimension and applicable bolt for each hexagon socket

(2) Each dimension and applicable bolt for each long hexagon socket

Shape B Shape C

Shape D

955139

955140

955141

955149

955142

955150

955143

955151

991480

955144

955146

955147

M 8

M 10

M 12

M 14

M 16

M 10

M 12

M 14

M 16

M 18

W 3/8"

W 7/16"

W 1/2"

W 5/8"

125

13 mm

14 mm

17 mm

19 mm

21 mm

22 mm

24 mm

26 mm

M 8

M 12

Hexagon socket

12.7

Square

drive

dimension

Sq (mm)

Part

name

Code

No.

Nominal diameter of applicable bolts

Dihedral

width

H (mm)

Shape

Socket primary dimensions

(mm)

ISO

(Ordinary)

ISO

(Small type)

Inch

screw

High-tension

107

12.7

Square

drive

dimension

Sq (mm)

Part name

Code

No.

Nominal diameter of applicable bolts

Dihedral

width

H (mm)

Shape

Socket primary

dimensions (mm)

ISO

(Ordinary)

ISO

(Small

type)

Inch

screw

High-

tension

14 mm

17 mm

19 mm

21 mm

22 mm

23 mm

24 mm

26 mm

27 mm

W 3/8"

W 7/16"

W 1/2"

W 9/16"

W 5/8"

M 12

M 16

873540

873536

873624

873626

873627

873628

873629

873630

985195

Hexagon socket

M 10

M 12

M 14

M 16

M 18

M 10

M 12

M 14

M 16

M 18

M 20

--- 6 ---

(3) Extension bar (Code No. 873633)

(4) Corner attachment (EW-14R)

(5) Universal joint (Code No. 986062)

(6) Holster (Code No. 307824)

--- 7 ---

Maker

•

Model

Item

Capacity

Ordinary bolt

High-tension bolt

Max. tightening

torque

6. COMPARISONS WITH SIMILAR PRODUCTS

6-1. Specification Comparisons

kgf

lbs

High speed

Note 1) The cord, socket and side handle are excluded.

Square drive dimension

min

-1

No-load rotation

speed

Impact rate

Center height

min

-1

Main body weight Note 1)

Lock torque

Rated current

Max. efficiency

Soft handle

Type of switch

Insulation method

Carbon brush

Cord length

Overall length x height

Motor specifications

No-load rotation speed

Maximum output

Motor

characteristics

min

-1

kgf

lbs

Low speed

High speed

Low speed

High speed

Low speed min

-1

min

-1

M 10 to M 16

M 12 to M 16

196

2,000

1,730

12.7 (1/2")

2,100

2,600

HITACHI

WH 14

270 x 209

(10-5/8" x 8-15/64")

Tumbler switch with

forward/reverse

changeover pushing

button

21,600

360

7.0

3.8

33.6

35 (1-3/8")

2.3 (5.1 lbs.)

Single phase AC

commutator motor

Double insulation

Mounted outside

2.5 (8.2 ft)

Not provided

M 10 to M 18

M 8 to M 14

250

2,550

2,210

185

1,880

1,640

12.7 (1/2")

0 to 2,300

0 to 1,800

0 to 2,800

0 to 2,200

HITACHI

WR 14VB

248 x 231

(9-49/64" x 9-3/32")

Steplessly variable

speed trigger switch

with forward/reverse

changeover pushing

button and speed

change lever

25,000

420

9.3

4.4

44.0

35 (1-3/8")

2.2 (4.8 lbs.)

Single phase AC

commutator motor

Double insulation

Mounted outside

5 (16.4 ft)

Provided

M 10 to M 16

M 8 to M 12

200

2,040

1,770

150

1,530

1,330

12.7 (1/2")

0 to 2,200

0 to 1,700

0 to 2,200

0 to 1,600

250 x 219

(9-27/32" x 8-5/8")

Steplessly variable

speed trigger switch

with forward/reverse

changeover pushing

button and speed

change lever

24,500

380

4.0

35 (1-3/8")

2.1 (4.6 lbs.)

Single phase AC

commutator motor

Double insulation

Mounted outside

5 (16.4 ft)

Provided

--- 8 ---

6-2. Tightening Torque

Figure 1 shows a comparison of tightening torque with the conventional Model WH 14 and C.

Bolt: M16 x 55 high tension bolt

Steel plate: SS34P, 25 mm in thickness

Tightening time (S)

Fig. 1 Comparison of tightening torque when tightening M16 high tension bolts

WR 14VB (Low speed)

The Model WR 14VB provides higher tightening torque than C

thanks to the operation with the optimum impact timing.

WH14

3500

(3035 in-lbs.)

kgf

2000

(1734 in-lbs.)

2500

(2168 in-lbs.)

3000

(2602 in-lbs.)

1500

(1301 in-lbs.)

WR 14VB (High speed)

1000

(867 in-lbs.)

500

(434 in-lbs.)

--- 9 ---

115

230

400

640

994

1370

316

625

1090

1735

2700

3720

•

Diameter and effective sectional areas of bolts

6-3. Appropriate Tightening Torque for Bolts

Generally speaking, the appropriate tightening torque for a bolt can be determined by the strength grade of the

bolt and the material tightened. Tables 2, 3 and 4 below list data relative to the strength grade of various bolts 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

•

T: Appropriate tightening torque (kgf

cm)

d: Nominal diameter for the bolt (cm)

p: Recommended axial tightening force to be applied to the bolt (kg)

p = Rated axial stress (kg

) x 0.8 x Effective sectional area of the bolt (mm

)

k: Torque coefficient (0.17)

Strength grade

Rated axial stress (kgf

)

Material

Heat treatment

4.8 8.8 10.9 12.9

29.1 58.2 79.2 95

Carbon steel such as SS and SC

Special alloy steel such as SNC, SCM and SNCM

Not treated Treated

....

Hard material

Nominal diameter of bolt

Effective sectional area

of bolt (mm

)

M8 x 1.25

36.6

M10 x 1.5

58.0

M12 x 1.75

84.3

M14 x 2.0

115.0

M16 x 2.0

157.0

M18 x 2.5

192

•

Tightening torque according to strength grade of bolts

•

Strength grade and rated axial stress of bolts

Nominal

diameter of bolt

Strength grade

M8 x 1.25

M10 x 1.5

M12 x 1.75

M14 x 2.0

M16 x 2.0

M18 x 2.5

4.8 6.8 8.8 10.9

12.9

174

345

600

960

1493

2054

230

460

800

1280

1990

2740

380

750

1310

2075

3240

4455

6.8

43.7

--- 10 ---

6-4. Tightening Torque Characteristics when Using An Extension Cord

Figure 2 shows relationship between time and tightening torque in high-speed mode when using an extension

cord. While the data are useful for handy reference, actual tightening torque will vary depending on tightening

conditions.

Fig. 2 Tightening torque characteristics when using an extension cord

When using a 60-m

extension cord

Bolt: M16 x 55 high tension bolt

Steel plate: SS34P, 25 mm in thickness

Tightening time (S)

When using a 30-m

extension cord

When using no

extension cord

7. PRECAUTIONS IN SALES PROMOTION

7-1. Safety Instructions

In the interest of promoting the safest and most efficient use of the Model WR 14VB by all 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.

7-1-1. Handling Instructions

Salespersons must be thoroughly familiar with the contents of the Handling Instructions in order to give pertinent

advice to the customer.

7-1-2. Caution Plates

(1) The following precautions are listed on the Name Plate or Caution Plate attached to the main body of each tool.

For Singapore

3500

(3035 in-lbs.)

kgf

2000

(1734 in-lbs.)

2500

(2168 in-lbs.)

3000

(2602 in-lbs.)

1500

(1307 in-lbs.)

500

(434 in-lbs.)

1000

(867 in-lbs.)

--- 11 ---

7-2. Tightening Torque Inspection Prior to Operation

The output tightening torque of the Model WR 14VB is higher than the rated tightening torque of certain bolts.

Accordingly, if the tightening time is prolonged for such bolts, it could cause damage to their threads or, in the

worst case, cause them to be sheared off. (This phenomenon is common to all existing impact wrenches.)

The customer should be advised to carry out several bolt tightening operations and adjust the tightening time as

necessary by measuring the tightening torque before commencing continuous operation.

7-3. Tightening Torque Variation

The tightening torque of an impact wrench may vary slightly in accordance with the factors described below.

Salespersons are requested to advise the customer to confirm that appropriate tightening torque is obtained by

measuring the torque at the beginning of the tightening operations, and as necessary during tightening

operations. In addition, the torque values shown in Para. 6-2, 6-3 and 6-4 above are useful as a handy reference,

and may be utilized as tentative standards.

(1) Voltage

The tightening torque of an impact wrench is influenced by voltage. For example, the tightening torque will be

reduced to about 90% if the Model WR 14VB is operated with 90% of the rated voltage. The line voltage may

be reduced by the use of a long extension cord depending on the work sites. Take the following

countermeasures against voltage reduction caused by the resistance of an extension cord and the load

current.

Decrease the resistance of an extension cord.

Use an extension cord which is as short as possible and has a thick core.

Compensate for reduction of the voltage by using a step up transformer.

At this time, prevent the plug voltage of the main body from exceeding the rated voltage.

Advise the customer to use an extension cord which is as thick as possible (cross sectional area of the core of

the extension cord: 1.25 mm

or larger) if it is unavoidable to use a long extension cord on a building site. In

addition, recommend the customer to use a step up transformer to step up the voltage by the amount of

reduction previously.

(2) Effects of low ambient temperatures

The tightening torque required may be reduced at low ambient temperatures or under the influence of grease

and different torque coefficients (dependent on manufacturing and finishing processes, and specified by bolt

manufacturers).

(3) Different bolt diameter

Differences in bolt diameter will cause variation of the required levels of tightening torque. Generally speaking,

higher tightening torque is required for large diameter bolts.

(4) Different materials being tightened

When a bolt is tightened into a soft material such as aluminum, plastic, wood, etc., the tightening torque is

considerably less than when the bolt is tightened into a hard material such as steel.

--- 12 ---

(5) Different tightening conditions

The tightening torque may vary in accordance with bolt torque coefficient (dependent on manufacturing and

finishing processes, and specified by bolt manufacturers), bolt grade and bolt length, even though the

dimensions of the bolts are the same. Tightening torque may also vary depending on the surface finishing

state of tightening materials (steel, aluminum, etc.) and materials to be tightened. In addition, if there is a seal

packing or a clearance between tightening materials, the tightening torque is decreased.

(6) Wear and looseness of the socket

With extended use, the hexagonal portion of the socket which is fitted to the head of the bolt and the

hexagonal portion which is fitted onto the anvil in the main body will become worn and loose. Wear and

looseness will cause a proportionate loss of tightening torque. In addition, use of an incorrect size socket will

also result in decreased torque.

(7) Bolt and nut rotate together

Tightening torque that can be achieved will be considerably decreased if the bolt and the nut rotate together

during the tightening operation. The customer should be advised to carefully observe the operation and

ensure this does not occur.

7-4. Temperature Rise

If the Model WR 14VB is used for tightening bolts which require long time to be tightened continuously, it will

cause temperature rise of the motor and burnout subsequently. Advise the customer to perform no-load operation

for several minutes to cool the motor if the outside of the main body becomes hot.

8. OTHER PRECAUTIONS

(1) Check for cracks or other damage on the socket

Cracks or any other faults on the socket are very hazardous and decrease the tightening torque. Advise the

customer to ensure that there are no abnormalities on the socket before operation.

(2) Socket dimensions

Without fail, utilize an appropriate socket which matches the bolt dimensions. If the clearance between the

socket and the nut is large, it will not only cause insufficient tightening torque but could also easily cause

damage to the socket. Please refer to Para. 5-2 for appropriate socket dimensions.

(3) Hammering section lubrication

Grease (Doubrex 251, optional accessory) is utilized in the hammering section.

Frequent or continuous use of the tool will cause excessive temperature rise of the hammering section,

resulting in depletion of the grease and subsequent increased wear of components which will, in turn, cause

loss of tightening efficiency. Accordingly, it is necessary to periodically replenish the grease in the hammering

section to ensure proper lubrication of moving and sliding components.

--- 13 ---

9. REPAIR GUIDE

The procedures and the precautions in disassembly and reassembly are described below.

The [bold] numbers correspond to the item numbers in the Parts List and the exploded assembly diagram of the

Model WR 14VB.

9-1. Disassembly

(1) Removal of the hammer case assembly

(a) Removal of the Hammer Case Ass'y [3]

Remove the four Seal Lock Hex. Socket Hd. Bolts M5 x 40 [2]. Supporting the Hammer Case Ass'y [3], tap

the tip of the Anvil [6] with a wooden hammer to remove the Hammer Case Ass'y [3]. Remove Gasket (A)

[20] from between the Hammer Case Ass'y [3] and the Inner Cover [21].

(b) Removal of the Anvil [6]

Remove the Hammer Case Ass'y [3]. Then the Anvil [6] can be removed from the bearing portion of the

Hammer Case Ass'y [3].

Tap the end surface of the Hammer Case Ass'y [3] with a wooden hammer to remove the Ring Gear [18].

If the Ring Gear [18] cannot be removed, warm up the Hammer Case Ass'y [3] then tap it with a wooden

hammer to remove the Ring Gear [18].

(2) Removal of the Spring [11]

Push the click of the Hammer [8] with a hand press and keep it at the position where the Spring [11] is

compressed fully. Remove the two Steel Balls D6.35 [7] from the steel ball guide at the cam portion of the

Spindle [16] and the Hammer [8] with a flat-blade screwdriver. Then release the hand press and remove the

Hammer [8] from the Spindle [16] to remove the Spring [11]. Be careful not to lose the twenty-nine Steel Balls

D3.97 [9] and Washer (B) [10] mounted between the Hammer [8] and the Spring [11] during disassembly.

Fig. 3

Fig. 4

[1]

[3]

[6]

[18]

[20]

[21]

[2]

Hammer click

Steel ball guide

Steel ball

Spindle cam top

Hammer

Spindle

--- 14 ---

(3) Removal of the Armature [25]

Remove the Tapping Screw (W/Flange) D4 x 20 (Black) [47] from the Tail Cover [46] to remove the Tail Cover

[46]. Remove the Brush Cap [55] and the Carbon Brushes [56]. Then the Armature [25] can be removed

together with the Inner Cover [21] from the Housing Ass'y [58]. At this time, be careful not to lose the Rubber

Washer [44] mounted between Bearing Bushing (B) [45] (press-fitted into the Housing Ass'y [58]) and the ball

bearing (at the commutator side of the Armature [25]). Be careful not to lose the Felt Packing [22] and the

Packing Washer [23] when removing the Armature [25] from the Inner Cover [21].

(4) Removal of the Switch [36] and the Cord [52]

Remove the Tapping Screw (W/Flange) D4 x 35 (Black) [33] from the Handle Cover [34] to remove the Handle

Cover [34] and Pushing Button (A) [35]. Remove the internal wires of the Choke Coil (White) [30] or the

Internal Wire (White) [29], Choke Coil (Black) [32] or the Internal Wire (Black) [31], Noise Suppressor Ass'y

[38], Diode Switch [48] and Stator [28] from the Switch [36] by inserting the pin of the special jig (Model J-86)

into each mounting hole of the internal wires and warping the leaf spring of the Switch [36] until each internal

wire is removed. Loosen the screw mounted to the Switch [36] with a small flat-blade screwdriver and remove

the internal wire of the Cord [52]. Then the Switch [36] can be removed. Remove the two Tapping Screws

(W/Flange) D4 x 16 [49], Cord Clip [50] and Cord Armor [51]. Then the Cord [52] can be removed.

Fig. 5

Fig. 6

[21]

[23]

[24]

[25]

[58]

[47]

[22]

[7]

[9]

[10]

[12]

[16]

[8]

[45]

[44]

[46]

[55]

[56]

[17]

[15]

[11]

--- 15 ---

Fig. 7

[33]

[35]

[36]

[34]

[37]

[52]

[38]

[48]

[50]

[51]

[49]

[31]

[32]

[28]

[30]

[29]

Fig. 8

[NOTE] If the leaf spring is warped excessively, it may be deformed permanently and the contact pressure with

the internal wires may be decreased. If the clearance shown in Fig. 9 is more than 0.5, replace the leaf

spring with new one.

Fig. 9

--- 16 ---

9-2. Reassembly

Reassembly can be accomplished by following the disassembly procedures in reverse. However, special

attention should be given to the following items.

(1) Reassembly of the housing assembly

(a) Mounting the switch

Pay attention to the relationship between the terminal numbers of the Switch [36] and the colors of the

internal wires.

Fig. 11 Wiring diagram

Fig. 10

With noise suppressor type

DIODE SWITCH: BLACK

REVERSING UNIT

OTHER TYPE

REVERSING UNIT

--- 17 ---

(b) Mounting the diode switch

The Diode Switch [48] is equipped with a high-speed/low-speed switch and a diode. Mount the Diode

Switch [48] to the specified position of the Housing Ass'y [58] as shown in Fig. 12. At this time, position the

high-speed/low-speed switch in the same direction of "H" indicated on the Housing Ass'y [58].

Fig. 13

[21]

[23]

[25]

[22]

Diode

Housing

High-speed/low-

speed switch

Fig. 12

(2) Reassembly of the hammer case assembly

Reassembly of the hammer

(a) Put the twenty-nine Steel Balls D3.97 [9] in between the Hammer [8] and Washer (B) [10].

(b) Mount the Spring [11] and Washer (A) [12] to the Hammer [8] then insert the Spindle [16] into it. Push the

click of the Hammer [8] with a hand press and keep it at the position where the Spring [11] is compressed

fully. At this time, push the Hammer [8] so that the Spindle [16] cam top is aligned with the steel ball guide

at the Hammer [8].

cam groove. Then release the hand press.

(3) Mounting direction of the packing washer

Insert the Packing Washer [23] into the Inner Cover [21] in the proper direction together with the Felt Packing

[22] when mounting the Armature [25] to the Inner Cover [21].

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Hitachi WR 14VB Technical Data And Service Manual

Brand: Hitachi

Model: WR 14VB

Type: Technical Data And Service Manual

Hitachi WR 14VB is a powerful impact wrench suitable for a wide range of applications, including:

Tightening and loosening bolts and nuts
Tightening anchor nuts
Assembly of scaffolding
Tightening/loosening of formwork bolts
Tightening/loosening of bolts for automobiles, rolling stock, shipbuilding, agricultural machinery and tools, construction machinery, etc.
Assembly and installation of electric equipment, plumbing facilities, air conditioning (duct assembly etc.), sanitary fixtures and various other facilities
Tightening of bolts for lightweight steel construction such as prefabricated houses

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Hitachi WR 14VB Technical Data And Service Manual

Hitachi WR 14VB Technical Data And Service Manual

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