Hitachi WR 16SA S Technical Data And Service Manual

Brand: Hitachi

Model: WR 16SA S

Type: Technical Data And Service Manual

TECHNICAL DATA

AND

SERVICE MANUAL

IMPACT WRENCH

WR 16SA

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

LIST No. E705 Feb. 2005

MODEL

WR 16SA

Hitachi



Power Tools

REMARK:

Throughout this TECHNICAL DATA AND SERVICE MANUAL, symbols are

used in the place of company names and model names of our competitors.

The symbols utilized here are as follows:

Symbol Utilized

Competitor

Company Name

Model Name

C MAKITA

TW0350

B BOSCH

GDS18E

P DEWALT

DW290

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 ............................................................................................................... 13

9. REPAIR GUIDE ............................................................................................................................. 14

9-1. Disassembly ...................................................................................................................................14

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

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

9-4. No-load Current Value ....................................................................................................................18

10. STANDARD REPAIR TIME (UNIT) SCHEDULES ...................................................................... 19

Assembly Diagram for WR 16SA

--- 1 ---

1. PRODUCT NAME

Hitachi Impact Wrench, Model WR 16SA

2. MARKETING OBJECTIVE

Twenty years have passed since the sales start of the conventional Model WH 16 and the demand has been

reduced. The new impact wrench Model WR 16SA is the upgraded version of the Model WH 16, featuring the

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

body, and durability. The Model WR 16SA is powerful and novel thanks to the 3-D CAD engineering as well as

the double-layer molding, improved handle grip and large bumper to plainly differentiate it from the competitors.

Please expand our market share with this Model WR 16SA.

3. APPLICATIONS

Tightening/loosening of bolts, nuts, etc.

[Applicable markets]

Wooden construction industry: Tightening of bolts 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

4. SELLING POINTS

Slip-resistant and comfortable

soft grip handle

Compact and lightweight

Class-top tightening torque

Stronger screw connection

thanks to the cylindrical housing

containing an insert screw

Housing is covered with

elastomer entirely.

Powerful motor

Large bumper

protects the outside.

Higher durability thanks to

the metallic bearing bushing

Convenient tumbler 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 16SA gives optimum impact at

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

(2) Stronger screw connection thanks to the cylindrical housing containing an insert screw

While the conventional Model WH 16 has the resin housing directly secured with screws, the Model

WR 16SA 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 16). Thus

the Model WR 16SA has higher durability.

Hammer case

(aluminum)

Screw (M5 bolt)

WR 16SA

WH 16

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 16SA is soft, slip-resistant and comfortable thanks to the soft material (elastomer

resin) covered on the handle. The Model WR 16SA 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 16SA 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 16SA from slipping on

a slanted surface such as a roof.

(6) Large bumper protects the outside

Prevention of damaging workpieces and being stained

The Model WR 16SA minimizes damaging workpieces even if it contacts the workpiece.

The hammer case is not hot when touched during continuous operation.

The hammer case is covered with a large bumper. Because the bumper is resistant to transmitting heat, the

bumper is not hot even if held by hand during operation.

(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 ---

5. SPECIFICATIONS

5-1. Specifications

Model

WR 16SA

Capacity

Item

Ordinary bolt M12 (15/32") --- M22 (7/8")

High-strength bolt M12 (15/32") --- M16 (5/8")

Tightening torque

360 N

•

m 3,670 kgf

•

cm (3,180 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

Tumbler switch with forward/reverse changeover pushing button

Power consumption

480 W, 450 W (220 V)

Full-load current

4.6 A (110 V), 4.2 A (120 V), 2.2 A (220 V), 2.2 A (230 V), 2.1 A (240 V)

Impact rate

2,100/min

Main body

2.8 kg (6.2 lbs.) (Excludes cord, socket and side handle)

Packaged

4.8 kg (10.6 lbs.)

Overall length x height

258 mm x 225 mm (10-5/32" x 8-55/64")

Center height

38 mm (1-1/2")

Package

Cord

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

Plastic case (For certain areas)

Standard accessory

Weight

Handle configuration

T-type

No-load rotation speed

1,900/min

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

2.5 m

Power source

Single phase AC 50/60 Hz

Insulation method Double insulation

--- 5 ---

955138

955139

955140

955141

955149

955142

955150

955143

955151

991480

955144

955146

955147

985197

M 8

M 10

M 12

M 14

M 16

M 20

M 8

M 10

M 12

M 14

M 16

M 18

M 22

W 5/16"

W 3/8"

W 7/16"

W 1/2"

W 5/8"

14 mm

17 mm

19 mm

21 mm

22 mm

23 mm

24 mm

26 mm

27 mm

30 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

985196

Hexagon socket

12.7 mm

(1/2")

Square

drive

dimension

Sq (mm)

Part

name

Code

No.

Nominal diameter of applicable bolts

Dihedral

width

H (mm)

Shape

Socket primary

dimensions (mm)

M 10

M 12

M 14

M 16

M 18

M 20

M 10

M 12

M 14

M 16

M 18

M 20

M 22

ISO

(Ordinary)

ISO

(Small type)

Inch

screw

High-tension

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

125

12 mm

13 mm

14 mm

17 mm

19 mm

21 mm

22 mm

24 mm

26 mm

30 mm

M 12

Hexagon socket

12.7 mm

(1/2")

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

--- 6 ---

(3) Extension bar (Code No. 873633)

(4) Corner attachment (EW-14R)

(5) Universal joint (Code No. 986062)

(6) Side handle (Code No. 323774)

--- 7 ---

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

M 12 --- M 22

M 12 --- M 16

360

3,670

3,190

12.7 (1/2")

1,900

2,100

HITACHI

WR 16SA

Maker

•

Model

Item

Capacity

258 x 225

(10-5/32" x 8-55/64")

Ordinary bolt

High-tension bolt

Max. tightening torque

Square drive dimension

/min

No-load rotation speed

Impact rate

Center height

/min

Main body weight

Note 1)

Voltage

Tumbler switch

with forward/

reverse

changeover

pushing button

Input

Rated current

Max. efficiency

Soft handle

Type of switch

Insulation method

Carbon brush

Cord length

6. COMPARISONS WITH SIMILAR PRODUCTS

6-1. Specification Comparisons

Overall length x height

Motor specifications

No-load rotation speed

Lock current

Motor characteristics

kgf

lbs

/min

230

23,400

21.0

480

2.2

38 (1-1/2")

2.8 (6.2 lbs.)

Single phase AC

commutator motor

Double insulation

Mounted outside

2.5 (8.2 ft)

Provided

M 12 --- M 20

M 12 --- M 16

294

3,000

2,600

12.7 (1/2")

1,700

2,000

HITACHI

WH 16

270 x 215

(10-5/8" x 8-15/32")

Tumbler switch

with forward/

reverse

changeover

pushing button

230

17,000

18.5

440

2.0

38 (1-1/2")

2.9 (6.4 lbs.)

Single phase AC

commutator motor

Double insulation

Mounted outside

2.5 (8.2 ft)

Not provided

M 12 --- M 22

M 12 --- M 16

350

3,570

3,100

12.7 (1/2")

2,000

283 x 235

(11-9/64" x 9-1/4")

Tumbler switch

with forward/

reverse

changeover

pushing button

230

22,800

400

1.8

37.5 (1-32/15")

2.9 (6.4 lbs.)

Single phase AC

commutator motor

Double insulation

Mounted outside

2.5 (8.2 ft)

Provided

M 6 --- M 18

70 --- 250

710 --- 2,550

620 --- 2,210

12.7 (1/2")

800 --- 1,900

1,000 --- 2,600

320 x 190

(12-19/32" x 7-31/64")

Staplessly

variable speed

trigger switch

with forward/

reverse

changeover

pushing button

230

27,200

500

2.3

37.5 (1-32/15")

3.2 (7.0 lbs.)

Single phase AC

commutator motor

Double insulation

Mounted inside

2.5 (8.2 ft)

Not provided

M 18

325

3,320

2,880

12.7 (1/2")

2,100

2,000

276 x 217

(10-55/64" x 8-35/64")

Trigger switch

with forward/

reverse

changeover

pushing button

230

20,000

710

3.2

37.5 (1-32/15")

3.2 (7.0 lbs.)

Single phase AC

commutator motor

Double insulation

Mounted outside

2.5 (8.2 ft)

Not provided

--- 8 ---

6-2. Tightening Torque

Figures 1 and 2 show comparisons of tightening torque with the conventional Model WH 16, P, C and B.

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

Bolt: M20 x 70 ordinary bolt

Steel plate: SS34P, 40 mm in thickness

Tightening time (S)

Fig. 2 Comparison of tightening torque when tightening M20 ordinary bolts

WR 16SA

WH 16

3500

(3035 in-lbs.)

kgf

2000

(1734 in-lbs.)

2500

(2168 in-lbs.)

3000

(2602 in-lbs.)

1500

(1301 in-lbs.)

WR 16SA

WH 16

3500

(3035 in-lbs.)

kgf

2000

(1734 in-lbs.)

2500

(2168 in-lbs.)

3000

(2602 in-lbs.)

1500

(1301 in-lbs.)

--- 9 ---

400

640

994

1370

1940

2640

1090

1735

2700

3720

5280

7180

•

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

)

M12 x 1.75

84.3

M14 x 2.0

115.0

M16 x 2.0

157.0

M18 x 2.5

192.0

M20 x 2.5

245.0

M22 x 2.5

303.0

•

Tightening torque according to strength grade of bolts

•

Strength grade and rated axial stress of bolts

Nominal

diameter of bolt

Strength grade

M12 x 1.75

M14 x 2.0

M16 x 2.0

M18 x 2.5

M20 x 2.5

M22 x 2.5

4.8 6.8 8.8 10.9

12.9

600

960

1493

2054

2912

3960

800

1280

1990

2740

3880

5276

1310

2075

3240

4455

6340

8613

6.8

43.7

--- 10 ---

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

Figure 3 shows relationship between time and tightening torque when using an extension cord. While the data

are useful for handy reference, actual tightening torque will vary depending on tightening conditions.

Fig. 3

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 16SA 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 Australia and New Zealand

3500

(3035 in-lbs.)

kgf

2000

(1734 in-lbs.)

2500

(2168 in-lbs.)

3000

(2602 in-lbs.)

1500

(1301 in-lbs.)

500

(434 in-lbs.)

1000

(867 in-lbs.)

--- 11 ---

•

For U.S.A. and Canada

•

For China

7-2. Tightening Torque Inspection Prior to Operation

The output tightening torque of the Model WR 16SA 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 16SA 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.

--- 12 ---

(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,

tightening torque is higher 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.

(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 16SA 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.

--- 13 ---

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.

--- 14 ---

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 16SA.

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 35 [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 thirty Steel Balls D3.97

[9] and the Hammer Washer [10] mounted between the Hammer [8] and the Spring [11] during disassembly.

Fig. 4

Fig. 5

[1]

[3]

[6]

[18]

[20]

[21]

[2]

Hammer click

Steel ball guide

Steel ball

Spindle cam top

Hammer

Spindle

--- 15 ---

(3) Removal of the Armature [25]

Remove the Tapping Screw (W/Flange) D4 x 20 (Black) [49] from the Tail Cover [48] to remove the Tail Cover

[48]. 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 [46] mounted between Bearing Bushing (B) [47] (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]

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

Cover [35]. Remove the screw from the Switch [36] and remove the Switch Adapter [37]. Then the Switch

[36] can be removed.

Fig. 6

Fig. 7

Fig. 8

[21]

[23]

[24]

[25]

[58]

[47]

[22]

[8]

[10]

[11]

[12]

[16]

[9]

[34]

[36]

[37]

[35]

[49]

[48]

[46]

[55]

[56]

--- 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

Mounting the switch

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

wires.

Fig. 10 Wiring diagram

Fig. 9

With noise suppressor type

Other type

--- 17 ---

(2) Reassembly of the hammer case assembly

Reassembly of the hammer

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

(b) Mount the Spring [11] and the Spring Seat [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].

(4) Mounting the cord clip

Fig. 11

Fig. 12

[21]

[23]

[25]

[22]

[50]

[51]

Cord dia. : 8.5 mm max. Cord dia. : Over 8.5 mm

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Hitachi WR 16SA S Technical Data And Service Manual

Hitachi WR 16SA S Technical Data And Service Manual

Hitachi WR 16SA S Technical Data And Service Manual

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