Hitachi DH 20PB Technical Data And Service Manual

POWER TOOLS

TECHNICAL DATA

AND

SERVICE MANUAL

HAMMER DRILL

DH 20PB

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

LIST No. E462 Feb. 2002

D

MODELS

DH 20PB

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:

Symbols Utilized

Competitors

Company Name

Model Name

BOSCH

GBH2-20SRE

B

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 ..................................................................................................................... 4

6. COMPARISONS WITH SIMILAR PRODUCTS .............................................................................. 9

6-1. Specification Comparisons ............................................................................................................ 9

6-2. Drilling Speed Comparisons .......................................................................................................... 9

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

7-1. Handling Instructions ................................................................................................................... 10

8. REFERENCE MATERIAL .............................................................................................................10

8-1. Lubrication ................................................................................................................................... 10

8-2. Tool Structure ............................................................................................................................... 10

8-3. "Rotation Only" and "Rotation + Striking" Changeover Mechanism ............................................ 13

8-4. "Rotation Only" (no striking) ......................................................................................................... 14

8-5. Drill Bits ........................................................................................................................................ 15

8-6. Chuck Section .............................................................................................................................. 16

8-7. Dust Collector (B) ........................................................................................................................ 16

9. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY ..........................................................18

9-1. Disassembly ................................................................................................................................ 18

9-2. Reassembly ................................................................................................................................. 20

9-3. Lubrication ................................................................................................................................... 20

9-4. Tightening Torque ........................................................................................................................ 20

9-5. Wiring Diagram ............................................................................................................................ 20

9-6. Internal Wire Arrangement and Wiring Work ............................................................................... 21

9-7.Insulation Tests ............................................................................................................................. 22

9-8.No-load Current Values ................................................................................................................ 22

10. STANDARD REPAIR TIME (UNIT) SCHEDULES ..................................................................... 23

Assembly Diagram for DH 20PB

--- 1 ---

1. PRODUCT NAME

Hitachi Hammer Drill (variable speed and reversing), Model DH 20PB

2. MARKETING OBJECTIVE

The Model DH 20PB has been developed based on the Model DH 24PB inheriting the reliable striking
mechanism. Thanks to the newly provided powerful motor, the Model DH 20PB has 20-mm drilling capacity (in
concrete) and the drilling speed is far faster than the competitors. The Model DH 20PB is an excellent cost/
performance hammer drill expected to expand our market share.

3. APPLICATIONS

(1) Rotation and striking function

Drilling anchor holes
Drilling holes in concrete, tile, brick and similar materials

(2) Rotation only function

Drilling holes in steel and wood (with chuck adapter)
Tightening and loosening machine screws and wood screws (with chuck adapter)

[Typical applications]

Air conditioning

••••••••••••••••••••••••••••••••

Installation of air conditioners, water coolers and heaters, and air ducts

Piping and plumbing

••••••••••••••••••••••••

Installation of gas, water, and sanitary facilities

Electrical work

•••••••••••••••••••••••••••••••••

Installation of light fixtures and various electric appliances

Interior decoration

•••••••••••••••••••••••••••

Installation of seating, display stands, and partitions

Other civil engineering, construction and repair work

--- 2 ---

4. SELLING POINTS

4-1. Selling Point Descriptions
(1) Compact

(2) Fast drilling speed

The drilling speed of the Model DH 20PB is 40% faster than B (10% slower than the Model DH 24PB) as the
Model DH 20PB has great striking energy owing to the optimally designed rotation speed, striking frequency
and weight of the striker.

(3) Powerful motor

The motor of the Model DH 20PB is more powerful than B because it is efficiently cooled in the same manner
as the Model DH 24PB.

(4) Variable speed control switch with superior dust protection and operability

The variable speed control switch allows the rotation speed to be changed freely throughout the drilling
operation. This permits easy centering and positioning, and ensures more effective drilling into fragile
materials such as tile and brick.

(5) Equipped with reversing switch

By utilizing the newly designed optional accessory chuck adapter and appropriate driver bits, and through the
combined functions of the variable speed control switch and reversing switch, the Model DH 20PB can be
used to tighten and loosen a variety of screws.

The Model DH 20PB with gun-type handle has the same striking mechanism as the Model DH 24PB equipped
with receiprocating bearing. The overall length is significantly reduced.

Maker • Model

Hitachi DH 20PB

B

Overall length

318 mm (12-17/32")

334 mm (13-5/32")

Maker • Model Overall length
HITACHI DH 20PB : 318 mm (12-17/32")
B : 334 mm (13-5/32")

Convenient handle shape

Variable speed control switch
and reversing switch

Fast drilling speed:
40% faster than B
(10% slower than the Model DH 24PB)
when the pressing force is 10 kgf.

Powerful 520 W motor

(B: 500 W)

--- 3 ---

DH 20PB

5. SPECIFICATIONS

5-1. Specifications

Model
Capacity

Concrete
Steel
Wood

Power source

Voltage, current and input

Rotation
speed

No-load

Full-load
Full-load blow
Type of motor
Type of switch
Type of handle

Enclosure

Weight

Packaging
Standard accessories

Net*

Gross

3.4 --- 20 mm (1/8" --- 13/16")
13 mm (1/2")
32 mm (1-1/4")
AC single phase 50 Hz or 60 Hz

0 --- 1,000 /min

-1

0 --- 750 /min

-1

0 --- 4,200/min

-1

AC single-phase commutator motor
Speed control switch with reversing switch
Gun-type handle of main body and side handle
Housing

Handle cover
Gear cover

2.3 kg (5.1 lbs.)

4.6 kg (10.1 lbs.)
Corrugated cardboard box with case

(1) Case

•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••

1

(2) Side handle

••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••

1

(3) Depth gauge

•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••

1

*: Weight excludes cord and side handle.

Voltage (V)
Current (A)
Input (W) 520

••••••••

Glassfiber reinforced polyamide resin (green)

••••••••••••••

Glassfiber reinforced polyamide resin (black)

110

5.0

230

2.4

--- 4 ---

5-2. Optional Accessories

A. Drilling anchor holes (rotation + striking)

Drill bit (slender shaft)

(1) Drill bit (slender shaft)

(2) Adapter for slender shaft

(SDS-plus shank)

+

Drill bit (taper shank)

+

(1) Drill bit (taper shank)

(2) Taper shank adapter
(SDS-plus shank)

(3) Cotter

13 mm Hammer drill chuck

For drilling operations when using a straight shank bit for impact drilling with a hammer drill

+

Drill bit (slender shaft)

Outer dia. (mm)

3.4 (1/8")

3.5 (9/64")

Effective length (mm)

45 (1-25/32")
45 (1-25/32")

Overall length (mm)

90 (3-17/32")
90 (3-17/32")

Code No.

306369
306368

Code No.

306370

Adapter for slender shaft

(1) Drill bit (taper shank)

Outer dia. (mm)

11 (7/16")

12.3 (31/64")

12.7 (1/2")

14.3 (9/16")

14.5 (73/128")

17.5 (11/16")

Code No.

944460
944461
993038
944462
944500
944463

Type

Morse taper

No. 1

Code No.

303617

Code No.

944477

(3) Cotter(2) Taper shank adapter

Straight shank bit for
impact drills

13 mm (1/2") hammer drill
chuck (SDS-plus shank)

Chuck wrench

Part name

13 mm (1/2") hammer drill chuck
(including chuck wrench)

Chuck wrench
Rubber cap

Code No.

303332

303334
303335

Part name Code No.

A-taper
B-taper

303619
303620

Taper shank adapter (A-taper or B-taper) is provided as an
optional accessory, but drill bit is not provided.

--- 5 ---

B. Anchor setting

Anchor setting bar to permit anchor setting operation with the hammer drill

Anchor setting bar

Anchor setting adapter (SDS-plus shank)

Anchor setting bar for manual anchor setting

Anchor setting adapter

Part name

W - 1/4 anchor setting adapter - A
W - 5/16 anchor setting adapter - A
W - 3/8 anchor setting adapter - A
W - 1/2 anchor setting adapter - A
W - 5/8 anchor setting adapter - A

Internal cone type

Code No. Part name Code No.

971974
971795
971796
971797
971798

971799
971800
971801
971802
971803

External cone type

+

W - 1/4 anchor setting adapter - B
W - 5/16 anchor setting adapter - B
W - 3/8 anchor setting adapter - B
W - 1/2 anchor setting adapter - B
W - 5/8 anchor setting adapter - B

C. Large hole boring (rotation + striking)

Center pin, core bit, core bit shank and guide plate

(Guide plate)

+

++

Center pin Core bit Core bit shank

(SDS-plus shank)

(1) Center pin (Do not use bit with outer diameter of 25 mm (31/32") and 29 mm (1-5/32").)

Center pin (A)
Center pin (B)

Core bit (outer diameter) 32, 35, 38 mm (1-1/4", 1-3/8", 1-1/2")
Core bit (outer diameter) 45, 50 mm (1-25/32", 2")

Code No. 982684
Code No. 982685

Part name

W - 1/4 anchor setting adapter - A
W - 5/16 anchor setting adapter - A
W - 3/8 anchor setting adapter - A
W - 3/8 anchor setting adapter - A

Internal cone type

Overall length

Code No. Part name Code No.

260
260
160
260

302976
302975
303621
302974

W - 1/4 anchor setting adapter - B
W - 5/16 anchor setting adapter - B
W - 3/8 anchor setting adapter - B
W - 3/8 anchor setting adapter - B

260
260
160
260

302979
302978
303622
302977

External cone type

Overall length

--- 6 ---

Core bit (outer diameter) (mm) Code No. Core bit (outer diameter) Code No.

(2) Guide plate

32 (1-1/4") 982686

50 (2")

982690
35 (1-3/8") 982687
38 (1-1/2") 982688
45 (1-25/32") 982689

Outer diameter (mm) Code No. Outer diameter (mm) Code No.

(3) Core bit with guide plate (The guide plate is not equipped with core bit with outer diameter of 25 mm

(31/32") and 29 mm (1-5/32").)

25 (31/32") 982672 45 (1-25/32") 982677
29 (1-5/32") 982673 50 (2") 982678
32 (1-1/4") 982674
35 (1-3/8") 982675
38 (1-1/2") 982676

(4) Core bit shank (SDS-plus shank)

Core bit shank (A)

Core bit shank (B)

Core bit (outer diameter) 25 --- 38 mm

(31/32" --- 1-1/2")

Overall length 105 mm (4-1/8")
Overall length 300 mm (11-52/64")

Core bit (outer diameter) 45 --- 90 mm

(1-25/32" --- 3-9/16")

Overall length 300 mm (11-52/64")

Code No. 303625

Code No. 303626

Code No. 303627

D. Crushing operation (rotation + striking)

Bull point (round type only)
(SDS-plus shank)

Code No. 303046

E. Bolt placing operation with chemical anchor (rotation + striking)

(Standard sockets available on the market)

+

12.7 mm (1/2") Chemical anchor adapter (SDS-plus shank)
19 mm (3/4") Chemical anchor adapter (SDS-plus shank)

12.7 mm (1/2") Chemical anchor adapter
19 mm (3/4") Chemical anchor adapter

Part name Code No.

303044
303045

--- 7 ---

F. Drilling hole and driving screw (rotation only)

Drill chuck, chuck adapter (G), special screw and chuck wrench

13 mm (1/2") Drill chuck
(13VLR type)

+

Chuck adapter (G)
(SDS-plus shank)

Part name Code No.

Chuck wrench

+

(Note)
If the tool is to be used for loosening screws, open the three jaws of
the drill chuck and securely fix the drill chuck to the chuck adapter
(G) with the special screw (a left-hand threaded M6 screw) when
mounting the drill chuck onto the chuck adapter (G).

Drill chuck adapter set (SDS-plus) (including a-c)

b. 13 mm (1/2") drill chuck 13VLR (with chuck wrench)

303820
303623

a. Chuck adapter (G) for SDS-plus shank system

c. Special screw (M6 left-hand threaded)

950275
981122

(1) Cross-recessed head (Phillips) bit

[Overall length: 70 mm]
(For use with cross-recessed head (Phillips) screw)

(2) Slotted-head (minus) bit

[Overall length: 50 mm]
(For use with slotted-head (minus) screw)

Stamped bit No.

Tip thickness

Bit No.

No. 2

No. 3

Code No.

955654

955655

Applicable screw dia. (mm)

3 --- 5

6 --- 8

Bit tip
thickness

0.8

1

Code No.

955658

955673

Applicable screw dia. (mm)

4

5 --- 6

Special screw

--- 8 ---

Drill chuck
(13VLA)

+

Chuck adapter (D)
(SDS-plus shank)

Chuck wrench

G. Driving screws (rotation only)

••••

For drilling holes in steel and wood

H. Drilling screws (rotation only)

Plus driver bit [overall length: 25 mm] (for cross-recessed head screws)

Bit No.

+

Chuck adapter (D)
(SDS-plus shank)

Bit No.

No. 2
No. 3

Screw size

3 --- 5 mm
6 --- 8 mm

Code No.

971511Z
971512Z

Part name
Chuck adapter (D) (for SDS-plus shank type)
13 mm (1/2") drill chuck 13VLA (with chuck wrench)

Code No.

303624

950272

(NOTE)
The 13VLA drill chuck and chuck adapter (D) cannot be used for reverse rotation. If reverse rotation is to be
used for loosening screws, use the plus bit (Bit No. 2), described below, by attaching it directly to chuck
adapter (D).

I. Grease for electric impact drill

Containing 500 g (1.1 lbs.): Code No. 980927

Containing 30 g (0.07 lbs.): Code No. 981840

70 g (0.15 lbs.): Code No. 308471

J. Dust cup, dust collector (B)

Dust collector (B) ass'y

Code No. 306885

Dust cup

Code No. 971787

--- 9 ---

6. COMPARISONS WITH SIMILAR PRODUCTS

6-1. Specification Comparisons

Maker
Model
Capacity

Concrete
Steel
Wood

mm
mm
mm

W
/min.
/min.
/min.

dB(A)

Input
No-load rotation speed
Full-load rotation speed
Full-load blow
No-load sound

pressure level

Reversing switch

Variable speed

Safety-release clutch
Bit drive system

Dimensions

Weight

Length

Height
Width

mm

mm
mm

kg

Hitachi

DH 20PB DH 24PB

B

20 (13/16")
13 (1/2")
32 (1-1/4")

24 (15/16")
13 (1/2")
32 (1-1/4")

20 (13/16")
10 (3/8")
30 (1-3/16")

520 620 500
0 --- 1,000 0 --- 1,050 0 --- 1,100
0 --- 750 0 --- 800 0 --- 850
0 --- 4,200 0 --- 4,400 0 --- 3,900

90 90 88

SDS-plus shank SDS-plus shank SDS-plus shank

318 (12-17/32") 318 (12-17/32")

334 (13-5/32")
360 (14-3/16")

185 (7-9/32") 185 (7-9/32") 205 (8-1/16")
72 (2-27/32") 72 (2-27/32") 79 (3-1/8")

2.3 (5.1 Ibs.) 2.3 (5.1 Ibs.) 2.3 (5.1 Ibs.)

6-2. Drilling Speed Comparisons

Drilling speed depends on the operating conditions. The test results shown in Fig. 1 are based on actual factory
tests, and are used as a reference only. Fig. 1 shows the drilling speed comparisons for downward drilling.
The drill bits used are the Hitachi genuine SDS-plus shank bits.

Fig. 1 Drilling speed comparisons (downward drilling)

Hitachi DH 24PB

Drilling speed (mm/min)

Drill bit dia. (mm)

Pressing force: 10 kgf
Test material : Concrete panel with

a compression strength
of 240 kgf/cm

2

Hitachi DH 20PB

B

8

201210 14 1816

100

500
400
300

200

1000

700

800

900

600

0

Note 1) Mark " "

•••

Equipped

2) Weight excludes cord and side handle.

--- 10 ---

7. PRECAUTIONS IN SALES PROMOTION

In the interest of promoting the safest and most efficient use of the Model DH 20PB Hammer Drill by all of our
customers, it is very important that at the time of sales 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 attached to each tool.

7-1. Handling Instructions

Although every effort is made in each step of design, manufacture and inspection to provide protection against
safety hazards, the dangers inherent in the use of any electric power tool cannot be completely eliminated.
Accordingly, general precautions and suggestions for the use of electric power tools, and specific precautions and
suggestions for the use of the Hammer Drill are listed in the Handling Instructions to enhance the safe, efficient
use of the tool by the customer. Salespersons must be thoroughly familiar with the contents of the Handling
Instructions to be able to offer appropriate guidance to the customer during sales promotion.

8. REFERENCE MATERIAL

8-1. Lubrication

It is not necessary to replenish the grease lubricant unless the tool is disassembled or there is grease leakage
due to a defective seal. Special grease is used in the striking section. Should the striking section (within the gear
cover) be disassembled, carefully remove the old grease from all parts and, on reassembly, insert 70 g (0.15 lbs.)
of new grease into the gear cover. Be careful not to exceed the designed amount of grease. Excessive grease
will reduce striking efficiency.

8-2. Tool Structure

While the structure is essentially the same as the Model DH 24PB, the descriptions below are included to
enhance your understanding of the tool and its mechanisms.

Transmission of rotation
Unlike conventional hammer drills, the armature shaft in the Model DH 20PB is in parallel with the tool shaft--­the same structure that is employed in most impact drills. This structure was adopted in order to make the
Model DH 20PB more compact for easier handling and operability. Thus, the appearance of the Model
DH 20PB is similar to that of an impact drill. The rotation of the armature is transmitted to the second shaft via
the first gear, and causes it to rotate. The second pinion provided on the second shaft engages the second
gear mounted on the outer circumference of the cylinder. The cylinder is coupled to the second gear by
means of a slip mechanism, and they rotate together. The end of the cylinder also functions as the drill bit
retainer. The cylinder is key-connected to the inserted drill bit by means of two key rails, and transmits rotation
to the drill bit. A steel ball is used to prevent the bit from falling.

--- 11 ---

Key rail
(2 pieces)

Piston pin

Cylinder

Steel ball

Clutch

Armature shaft

Circular groove

Piston

Reciprocating bearing

Second shaft

First gear

Armature

Fig. 2

Piston reciprocating mechanism

In conventional hammer drills, a piston is caused to reciprocate by a connecting rod and crank shaft, and the
crank shaft and the cylinder axis are at a right angle to each other. Accordingly, the armature shaft and the
cylinder axis are at a right angle to each other. In the Model DH 20PB through adoption of a spiral drive
system (a mechanism using a reciprocating bearing), a more compact design has been achieved by arranging
the armature shaft in parallel with the cylinder axis. Referring to Fig. 2, the rotation of armature is transmitted
to the second shaft via the first gear. The second shaft rotation is further transmitted through a spline to the
clutch, which engages with a reciprocating bearing and causes it to rotate. However, as illustrated, circular
grooves on the inner race of the reciprocating bearing are positioned on an angle of inclination with relation to
the second shaft. The rotation of the inner race and the shaft causes that angle of inclination to change
regularly forward and back with relation to the second shaft, and produces a rocking motion to the outer race
of the reciprocating bearing. Finally, a rod extending from the outer race of the reciprocating bearing is
connected to the piston by a piston pin, and causes the reciprocating motion of the piston.

Tool shaft

--- 12 ---

Striking function

The piston reciprocates within the cylinder to move the striker in the same manner as in conventional hammer
drills. As the piston reciprocates, the changing air pressure inside the air chamber between the piston and the
striker causes the striker to move the continuously strike against the end of the second hammer. At the same
time, the changing air pressure within the air chamber which moves the striker also provides an "air cushion"
which absorbs the impact of the striking action. As air leakage from the air chamber would weaken the air­cushion effect and reduce impact absorption, the o-ring (mounted on the striker) is extremely important to seal
the air. Although special rubber material is utilized in construction of the o-ring to make its effective service life
as long as possible, wear cannot be fully avoided. Accordingly, it is recommended that the o-ring be replaced
approximately once a year, depending on the frequency of usage of the tool.

Idle striking prevention mechanism

The idle striking prevention mechanism in the Model DH 20PB is different from that of conventional hammer
drills. When the drill bit is lifted from the concrete surface on completion of drilling, the second hammer moves
to the position indicated by the continuous lines in Fig. 3, and the protruding (lip) portion at the tip of the striker
is gripped by the o-ring mounted on the inner wall of the cylinder. In this state, should the piston continue to
move so that the small piston respiratory hole is blocked by the inner wall of the cylinder, the air in the air
chamber will pass through the large piston respiratory hole and be released through the air-escape slot and
large cylinder respiratory hole provided on the inner wall of the cylinder. Accordingly, there is no change in the
air pressure within the air chamber, and movement of the striker (idle striking operation) is prevented.
The gripping force of the o-ring on the striker is so small in comparison with the conventional mouth system
that practically no pressing force at all is required to restart the striking operation.

Cylinder

Travel distance

Striker

Air-escape slot

O-ring

Second hammer

Clutch spring

Large cylinder respiratory hole

Fig. 3

Front cap

Claw

Second gear

Coil spring

Reciprocating bearing

Piston

Second shaft

Change lever

Small piston respiratory hole

Clutch

First gear

Gear cover

--- 13 ---

Slip mechanism

The slip mechanism in the Model DH 20PB consists of a coil spring which applies a pre-set amount of
pressure to ensure the interlocking of three claws provided on the flange of the cylinder (the final rotating
shaft) and three matching claws provided on the face of the second gear, by which rotation is transmitted to
the cylinder. The second gear is fitted to the cylinder with a certain amount of play. If an excessively large
torque is applied to the tool shaft (cylinder), the force of the torque will exceed the pressure of the coil spring
and cause the claws on the second gear to disengage from and ride over the claws on the cylinder so that the
second gear idles and does not transmit rotation. Even should the drill bit come in contact with a reinforcing
bar within the concrete, causing sudden excessive torque, the slip mechanism functions to prevent damage to
the gears, and possible loss of control of the tool by the operator.

Sealed and dustproof construction

The gear cover is totally enclosed by oil seals, o-rings and other devices to prevent leakage of lubricating
grease, and to keep dust and dirt out into the internal mechanisms. The drill bit chuck portion is protected by a
rubber front cap to keep out dust and chips which could cause improper fitting of the drill bit and/or other faulty
operation of the chuck portion. The speed control switch is also fully dust-proofed type to prevent dust and
chips from entering the handle section and causing possible operational trouble or a breakdown of the
insulation.

Speed control

The Model DH 20PB is equipped with a variable speed control switch which permits free change of the
rotation speed and striking force. When drilling fragile materials, pull the switch trigger gently for low rotation
speed (striking force) to achieve optimum results.

8-3. "Rotation Only" and "Rotation + Striking" Changeover Mechanism

The change lever on the Model DH 20PB permits quick and easy changeover between the "Rotation Only" and
"Rotation + Striking" functions.
Armature rotation is transmitted to the second shaft and first gear, and then to the clutch via the spline on the
second shaft spline. Claws on the surface of the clutch engage matching claws on the reciprocating bearing to
convert the rotation into reciprocating motion. The clutch can travel back and forth on the second shaft. Claws on
the surface of the clutch is pressed against on the reciprocating bearing by the force of the clutch spring during
usual operation ("Rotation + Striking"). The reciprocating bearing is fitted on the second shaft with some play.
When the change lever is set to the "Rotation Only" ( "drill" mark) position, the eccentric pin of the change
lever forces the clutch to move against the pressure of the clutch spring in the direction of the front cap, so that it
disengages from the claws on the reciprocating bearing, and the reciprocating bearing stops rotating on the
second shaft. When the change lever is returned to the "Rotation + Striking" ( "hammer" mark) position, the
force of the clutch spring presses the clutch back against the reciprocating bearing so that the claws engage to
transmit rotation to the reciprocating bearing once more.

--- 14 ---

8-4. "Rotation Only" (no striking)

Turn the change lever fully clockwise to the "drill" mark position to obtain "Rotation Only" function. To use the tool
for drilling or driving screws, the chuck adapter and a drill chuck (optional accessories) must be used. In older
models such as the Models DH 22 and DH 22V, when the chuck adapter is mounted the second hammer moves
forward, the striker slips out of striking position to open up an air vent and stop striking operation and "Rotation
Only" operation is automatically obtained. However, since the Models DH 24PA and DH 24PB are equipped with
a change lever for changeover between "Rotation + Striking" and "Rotation Only" functions, merely mounting the
chuck adapter will not stop the striking action; it is absolutely necessary to turn the change lever to the "Rotation
Only" setting for drilling or driving screws. Should the change lever be set to the "Rotation + Striking" position
when the tool is used for drilling, the striking action may cause the drill chuck to be broken or damaged. Sales
personnel should carefully ensure that the buyer is thoroughly advised on this point.

--- 15 ---

8-5. Drill Bits

The chuck section is designed exclusively for the popular and widely available SDS-plus shank bits, as shown in
Fig. 4. Rotating torque is transmitted to the drill bit by two key rails provided in the tool holding section. A steel
ball is used to prevent the bit from falling out. Compared with the conventional structure that uses two needle
rollers to both transmit rotating torque and prevent the bit from falling out, this new structure reduces damage to
the shank of the drill bit and extends the service life of the chuck section.

Ball holder

Key rail (two pieces)

Key slot (two pieces)

Section A-A'

Steel ball

Cylinder

A

A'

Shape of SDS-plus shank bit

Section of the chuck section

Fig. 4

The service life of a drill bit with a diameter of 8 mm is approximately 300 holes when drilling into concrete with a
depth of 30 mm. If reground before the end of its service life, the drill bit will continue to provide efficient drilling.
Fig. 5 shows the regrinding angle.

Regrinding angle of drill bit

Fig. 5

a : b = 1 : 2

Rotation
direction

60

25

a

b

A

B

Section A-B

130

θ

--- 16 ---

8-6. Chuck Section

Fig. 6 shows the construction of the chuck section.

Front cap

Grip

Steel ball

Holder spring

Washer (B)

Key rails
(two pieces)

Ball holder

Cylinder

Forward

Backward

Fig. 6

The opening where the drill bit is inserted is covered with a front cap (rubber) to prevent dust from entering inside.
When the drill bit is inserted, the steel ball fits into the matching groove on the drill bit to lock it in place and
prevent it from falling out . Two key rails transmit rotating torque to the drill bit. The drill bit can be released by
simply pulling the grip back. The grip is held forward by a holder spring. To mount a drill bit, pull the grip back to
compress the holder spring. The steel ball then moves outward. While turning the drill bit, push it until it makes
contact and is fully inserted. Then release the grip so that it moves forward and fixes the drill bit. To remove the
drill bit, simply pull the grip back fully and pull the drill bit out.

8-7. Dust Collector (B)

While drilling holes overhead, dust collector (B) can be mounted on the Model DH 24PE to prevent dust and chips
from falling downward. Dust collector (B) is intended solely for use when drilling holes in concrete, and cannot be
used for drilling holes in steel or wood. It is designed for use with drill bits with overall length of 166 mm, 160 mm
or 110 mm, and cannot be used with any longer bits. When using a drill bit with an overall length of 166 mm with
dust collector (B), drilling up to a depth of approximately 72 mm is possible. When using dust collector (B),
ensure it is securely fastened to the grip on the main body with socket adapter (B).
Although the socket and socket adapter (B) rotate together with the tool shank, there is a steel ball between the
outer race and the socket which serves as a ball bearing. Should the dust cover be forced against the concrete
surface, it will not rotate even though the tool shank continues to rotate. Should the tool be operated when the
dust cover is not being held against a concrete surface, inertia may cause dust collector (B) to become
disconnected from the grip. Accordingly, caution the customer to press dust collector (B) and drill bit firmly against
the concrete surface before turning on the switch to start drilling.
When dust collector (B) is used, almost no dust and chips are scattered about. However, since the chips and dust
remaining in the collector may scatter after completion of the drilling operation, the customer should be advised to
always wear protective glasses.
When dust collector (B) is disassembled for repair or maintenance, be very careful to prevent oil or grease from
adhering to the steel balls. Grease or oil on the steel balls may cause concrete dust to enter the unit and cause
defective rotation.

--- 17 ---

Fig. 7 Dust collector (B) structure

Approx. 72 mm (2-27/32")

Approx. 16 mm (5/8")

Drill bit length: 166 mm

Drill bit length: 110 mm

Grip
(on the main body side)

Socket adapter (B)

Socket

Outer race

D6.35 steel ball

Washer

Retaining ring for D30 shaft

Dust cover

Seal cover

--- 18 ---

9. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY

The [Bold] numbers in the descriptions below correspond to the item numbers in the Parts List and exploded
assembly diagram.

9-1. Disassembly

(1) Disassembly of the Striking Mechanism Section

With a drill bit or screwdriver bit, push in the Second Hammer [25] to release the Striker [28] from the O-Ring
(I.D.10.5) [27].

Set the Change Lever [13] to a position halfway between the "Drill" and "Hammer" marks on the Gear Cover

[7], insert a small flat-blade screwdriver into the concave position located on the rear end of the Change Lever
[13], and pull it off. (It is very important to ensure that the Change Lever [13] is positioned halfway between

the "Drill" and "Hammer" marks when it is disassembled or assembled.)

Loosen the four Tapping Screws (W/Flange) D5 x 35 [8], and remove the Gear Cover [7]. The Inner Cover
[33] and the Housing [53] are loosely fitted together. Attempting to pull them out first could cause the
Armature [46] to be pulled out at the same time, causing damage to the Carbon Brushes [62].

Remove Spring (B) [34] from the end of the Gear Shaft Set [35], and turn the Gear Shaft Set [35] so that the
Piston [30] moves to its maximum upper position (inner cover side). The arm of the Reciprocating Bearing
[40] can then be disconnected from the Piston Pin [31], and the Gear Shaft Set [35] and the components
mounted on it can be removed from the Inner Cover [33] as a unit.

With a bearing puller (Special Repair Tool J-30 Bearing Puller Ass'y, Code No. 970804, is recommended),
remove the Spacer [41] from the Gear Shaft Set [35]. Then take off the Reciprocating Bearing [40]. At this
time, carefully note that the Spacer [41] must be aligned with and press-fitted onto the 9 mm diameter end of
the Gear Shaft Set [35].

Move the Clutch [38] to the pinion side of the Gear Shaft Set [35], and pull off the O-Ring (S-8) [39].
The Clutch Spring [37] and Washer (B) [36] can then be removed from the Gear Shaft Set [35].

(2) Disassembly of the chuck section

As shown in Fig. 8, slide the Grip [2] in the direction
indicated by the arrow mark, and remove the Front Cap
[1]. The Grip [2], the Ball Holder [3] inside the grip, the
Holder Spring [4], Washer (B) [5] and the Steel Ball D7.0
[18] can then be removed from the Cylinder [20].

Front Cap [1]

Grip [2]

Fig. 8

--- 19 ---

(3) Disassembly of the cylinder, second gear (slip mechanism section) and related parts

Take the Inner Cover [33] off from the Gear Cover [7] and remove the entire chuck section. Extract the
Retaining Ring for D20 Shaft [6]. (For easy removal of this retaining ring, use of Special Repair Tool J-200
Snap Ring Pliers [Code No. 970976] is recommended.) Then, turn the Gear Cover [7] upright and use a hand
press to extract the Cylinder [20] from the Gear Cover [7]. The Sleeve [15] can then be extracted from the
Cylinder [20]. At this time, be very careful not to lose the three Steel Balls D5.556 [19]. Remove the
Retaining Ring for D30 Shaft [24] from the upper part of the Cylinder [20]. The Second Gear [21], Spring (A)

[22] and Washer (A) [23] can then be removed from the Cylinder [20]. Then, extract the O-Ring (I.D.10.5)
[27] from the inner part of the Cylinder [20] and the Second Hammer [25] can be extracted from the Cylinder
[20]. (For easy extraction of this O-Ring (I.D.10.5) [27], fit a Special Repair Tool J-201 Spring Hook [Code No.
970977] onto the outer circumference of the O-Ring (I.D.10.5) [27] and pull it out.) As the O-Ring (I.D.10.5)
[27] is employed to prevent idle striking, please advise customers to replace it with a new one whenever it is

disassembled.
Extract the Retaining Ring for D37 Hole [17], turn the Gear Cover [7] so that its tip portion is upward, and use
a hand press to extract the Ball Bearing 6904DDPS2L [16] from the Gear Cover [7]. Next, turn the Gear
Cover [7] over and use the hand press to extract the Oil Seal [14] from the Gear Cover [7]. Ensure that the
Oil Seal [14] is replaced with a new one whenever it is disassembled.

Use of Special repair tools
Snap ring pliers [J-200]: (See Fig. 9.)
Used to remove the Retaining Ring for D20 Shaft [6] which fixes the Cylinder [20] at the tip end of the Gear
Cover [7].
Spring hook [J-201]: (See Fig. 10.)
Used to extract the O-Ring (I.D.10.5) [27] inserted at the inner part of the Cylinder [20] which is designed to
catch and grip the striker to prevent idle hammering. As shown in Fig. 11, fit the Spring Hook [J-201] onto the
o-ring from its outer circumference, and pull it out.

Fig. 11

140

45

217

R2

1.2 mm dia.

(1) Snap ring pliers (J-200)

Code No. 970976

(2) Spring Hook
Code No. 970977

J-201 Spring hook

Cylinder [20]

O-Ring (I.D.10.5) [27]

Fig. 9

Fig. 10

--- 20 ---

9-2. Reassembly

Perform reassembly in the reverse order of disassembly while observing the given precautions and taking care of
the following points.

(1) To make reassembly easier, coat grease on the Steel Balls [11], [18], [19].

(2) Reassembly of the Change Lever [13]

With a flat-blade screwdriver or similar tool, move the Clutch [38] and the Reciprocating Bearing [40] so that
the claw (protruding portion) of the Reciprocating Bearing [40] and the claw (protruding portion) of the Clutch
[38] are in contact.
After inserting Spring (H) [10] and Steel Ball D3.97 [11] into the recessed portion of the Gear Cover [7], apply
grease to the pin portion of the Change Lever [13] into the Gear Cover [7] so that it is positioned midway
between the "Hammer" mark and the "Drill" mark. Be careful that should the mounting position of the change
lever be incorrect, it will deform the claws of the change lever.

(3) Reassembly of the Oil Seal [14]

Prior to reassembly, apply grease to the inner circumference of the Oil Seal [14]. However, do not apply
grease to its outer circumference. Also, when press-fitting the Oil Seal [14], ensure it is straight and level.

9-3. Lubrication

Apply special grease (N.P.C. FG-6A, Code No. 980927 is recommended) to the inner and outer circumferences of
the Piston Pin [31] and Piston [30], O-Ring (A) [29] mounted on the Striker [28], O-Ring (B) [26] mounted on the
Second Hammer [25], the Reciprocating Bearing [40], the Reciprocating Bearing [40] mounting portion of the
Gear Shaft Set [35], the O-Ring (I.D.10.5) [27] and the clutch-claw portions of the Cylinder [20], the inner
circumferences of the metal inside the Inncer Cover [33], and external grooves of the Clutch [38]. Also, without
fail, insert 70 g (0.15 lbs.) of special grease inside the Gear Cover [7].

9-4. Tightening Torque

Tapping Screws (W/Flange) D4 [57] [69]

•••••

2.0 0.5 N•m (20 5 kgf•cm, 17.4 4.3 in-lbs.)

Tapping Screws (W/Flange) D5x35 [8]

••••••••

2.9 0.5 N•m (30 5 kgf•cm, 26.0 4.3 in-lbs.)

9-5. Wiring Diagram

Speed control switch

Fig. 12

Noise suppressor

Reversing switch

Brown

Cord

Stator

Armature

Blue

Black

BlackRed

Black

2

1

M2

C1

C2

M1

2

1

3

4

Stator

White

Gray

--- 21 ---

9-6. Internal Wire Arrangement and Wiring Work

Choke Coil

Fig. 13 Schematic diagram

Carbon Brush [62]

Brown (from the
Carbon Brush [62])

Gray (from the
Stator [49])

Black (from the
Stator [49])

Red (from the Stator
[49])

Blue (from the
Carbon Brush [62])

White (from the
Stator [49])

Choke coil

Noise Suppressor [60]

Cord [72]

Armature [46]

Transparent (neutral wire of
Noise Suppressor [60])

Speed Control Switch and
Reversing Switch [59]

Put the lead wires from the Stator [49]
under the Brush Holder [63]

Brush Terminal

--- 22 ---

(2) Wiring of speed control switch

Insert each cord into the terminal 1 and terminal
2 of the speed control switch as shown in Fig. 15
and tighten the screw (tightening torque: 0.6 0.2
N•m (6 2 Kgf•cm, 5.2 1.7 in-lbs)). Insert the lead
wire (gray) coming from the stator into the terminal
M1 and the lead wire (red) into the terminal M2.
Insert each lead wire (black) coming from the noise
suppressor into the terminals C1 and C2. After the
insertion, pull each lead wire slightly to check that
the lead wires do not come off. To disconnect the
lead wires, insert a small flat-blade screwdriver into
the windows near the terminals and pull out the lead
wires.

9-7.Insulation Tests

On completion of reassembly after repair, measure the insulation resistance and conduct the dielectric strength
test.
Insulation resistance: 7MΩ or more with DC 500 V Megohm Tester
Dielectric strength : AC 4,000 V/1 minute, with no abnormalities 220 V - 240 V (and 110 V for U.K. products)

AC 2,500 V/1 minute, with no abnormalities 110 V - 127 V (except U.K. products)

9-8. No-load Current Values

After no-load operation for 30 minutes, the no-load current value should be as follows.

(Carbon brush)

(Stator)

Black

Blue

White

Brown

Fig. 14 Wiring of reversing switch

Additional Wiring Work
General internal wiring can be accomplished by
referring to paragraphs 9-4 and 9-5. The following
are special instructions for switch connection.

(1) Wiring of reversing switch

Insert the lead wire (black) coming from the
stator into the terminal (1) of the reversing
switch, and the lead wire (white) into the terminal
(2) as shown in Fig. 14. Insert the lead wire
(brown) coming from the carbon brush into the
terminal (3) and the lead wire (blue) into the
terminal (4). After the insertion, pull each lead
wire slightly to check the lead wires do not come
off. To disconnect the lead wires, insert a small
flat-blade screwdriver into the windows near the
terminals and pull out the lead wires.

(Carbon brush)

(Stator)

(Noise suppressor)

(Stator)

Black

Black or brown

Gray

Fig. 15 Wiring of speed control switch (DH 20PB)

(Cord)

(Cord)

(Stator)

Black

Red

(Noise suppressor)

White or blue

Voltage (V)

Current (A) Max.

(1)

(2)(4)

(3)

1

2

M2

C2

C1

M1

3.0

110

1.9

230

--- 23 ---

10. STANDARD REPAIR TIME (UNIT) SCHEDULES

MODEL 10 20 30 40

Fixed

Variable

DH 20PB

Work Flow

Switch
Cord

Striker
O-Ring (A)
Piston
Piston Pin
Washer (C)

Change Lever
O-Ring

Front Cap
Grip
Ball Holder
Holder Spring
Oil Seal
Steel Ball

Gear Cover
Ball Bearing

(6904DD)

Retaining Ring

Armature Ass'y
Inner Cover
O-Ring
Ball Bearing
(608DD)
Washer (A) x2
Ball Bearing

(608VV)

60 min.

50

Retaining Ring
Cylinder
Steel Ball x 4
Second Gear
Spring (A)
Washer (A)
Retaining Ring
Second Hammer
O-Ring (B)
O-Ring

Housing
Stator

Spring (B)
Gear Shaft Set
Spacer
Ball Bearing

(626VV)

General Assembly

ELECTRIC TOOL PARTS LIST

LIST NO.

HAMMER DRILL
Model DH 20PB

2002• 2•5

(E1)

E462

501

502

503

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

45

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

66

67

68

69

70

71

72

*

ALTERNATIVE PARTS

--- 2 ---

ITEM

NO.

CODE NO.

DESCRIPTION

REMARKS

NO.

USED

PARTS

2 -- 02

DH20PB

1 306-345 FRONT CAP 1
2 306-992 GRIP 1
3 306-343 BALL HOLDER 1
4 306-342 HOLDER SPRING 1
5 984-118 WASHER (B) 1
6 939-547

RETAINING RING FOR D20 SHAFT (10 PCS.)

1
7 314-876 GEAR COVER 1
8 301-654 TAPPING SCREW (W/FLANGE) D5X35 4
9 314-881 O-RING 1

10 981-328 SPRING (H) 1
11 959-155 STEEL BALL D3.97 (10 PCS.) 1
12 314-878 O-RING 1
13 314-877 CHANGE LEVER 1
14 307-688 OIL SEAL 1
15 307-690 SLEEVE 1
16 690-4DD BALL BEARING 6904DDPS2L 1
17 986-147 RETAINING RING FOR D37 HOLE 1
18 959-156 STEEL BALL D7.0 (10 PCS.) 1
19 959-154 STEEL BALL D5.556 (10 PCS.) 3
20 314-882 CYLINDER 1
21 301-677 SECOND GEAR 1
22 301-678 SPRING (A) 1
23 301-679 WASHER (A) 1
24 948-310 RETAINING RING FOR D30 SHAFT 1
25 301-671 SECOND HAMMER 1
26 301-672 O-RING (B) 1
27 301-680 O-RING (I.D. 10.5) 1
28 315-148 STRIKER 1
29 301-670 O-RING (A) 1
30 301-668 PISTON 1
31 301-666 PISTON PIN 1
32 303-977 WASHER (C) 1
33 314-880 INNER COVER 1
34 301-664 SPRING (B) 1
35 315-161 GEAR SHAFT SET 1
36 301-659 WASHER (B) 1
37 301-660 CLUTCH SPRING 1
38 301-661 CLUTCH 1
39 992-912 O-RING (S-8) 1
40 306-990 RECIPROCATING BEARING 1
41 301-663 SPACER 1
42 626-VVM BALL BEARING 626VVC2PS2L 1
43 876-796 O-RING (P-22) 1
44 608-DDM BALL BEARING 608DDC2PS2L 1

45 982-631 WASHER (A) 2
* 46 360-446U ARMATURE ASS’Y 110V-115V 1 INCLUD.44,45,52
* 46 360-446E ARMATURE 220V-230V 1

47 314-879 FAN GUIDE ASS’Y 1 INCLUD.48

48 994-343 RUBBER BUSHING 2
* 49 340-398C STATOR 110V-115V 1
* 49 340-398F STATOR 230V-240V 1

*

ALTERNATIVE PARTS --- 3 ---

ITEM

NO.

CODE NO.

DESCRIPTION

REMARKS

NO.

USED

PARTS

2 -- 02

DH20PB

50 314-914 INTERNAL WIRE (A) (BLACK) 1
51 314-913 INTERNAL WIRE (A) (GRAY) 1
52 608-VVM BALL BEARING 608VVC2PS2L 1
53 314-889 HOUSING 1

* 54 NAME PLATE 1

55 314-912 INTERNAL WIRE (A) (RED) 1
56 314-915 INTERNAL WIRE (A) (WHITE) 1
57 301-653

TAPPING SCREW (W/FLANGE) D4X20 (BLACK)

3

58 314-891 HANDLE COVER 1

* 59 314-916

SPEED CONTROL SWITCH (2P) 100V-115V

1

* 59 314-921

SPEED CONTROL SWITCH (2P) 220V-240V

1
60 994-273 NOISE SUPPRESSOR 1
61 302-488 EARTH TERMINAL 1
62 999-041 CARBON BRUSH (1 PAIR) 1
62 999-072

CARBON BRUSH (AUTO STOP TYPE) (1 PAIR) 1

63 955-203 BRUSH HOLDER 2
64 HITACHI LABEL 1

* 65 981-373 TUBE (D) 2 FOR CORD

66 315-147 DUST PACKING 1
67 314-922 CHOKE COIL (A) BLUE 1
68 314-923 CHOKE COIL (A) BROWN 1
69 984-750 TAPPING SCREW (W/FLANGE) D4X16 2
70 937-631 CORD CLIP 1
71 953-327 CORD ARMOR D8.8 1

* 72 500-390Z CORD 1 (CORD ARMOR D8.8)
* 72 500-440Z CORD 1 (CORD ARMOR D8.8) FOR GBR (230V)
* 72 500-391Z CORD 1 (CORD ARMOR D8.8) FOR SUI

*

ALTERNATIVE PARTS

--- 4 ---

STANDARD ACCESSORIES

OPTIONAL ACCESSORIES

ITEM

NO.

CODE NO.

DESCRIPTION

REMARKS

NO.

USED

ITEM

NO.

CODE NO.

DESCRIPTION

REMARKS

NO.

USED

2 -- 02

501 307-786 CASE 1
502 303-659 SIDE HANDLE 1
503 303-709 DEPTH GAUGE 1

601 306-369 DRILL BIT (SLENDER SHAFT) D3.4X90 1
602 306-368 DRILL BIT (SLENDER SHAFT) D3.5X90 1
603 306-370

ADAPTER FOR SLENDER SHAFT (SDS PLUS)

1
604 944-460 TAPER SHANK DRILL BIT D11X100 1
605 944-461 TAPER SHANK DRILL BIT D12.3X110 1
606 993-038 TAPER SHANK DRILL BIT D12.7X110 1
607 944-462 TAPER SHANK DRILL BIT D14.3X110 1
608 944-500 TAPER SHANK DRILL BIT D14.5X110 1
609 944-463 TAPER SHANK DRILL BIT D17.5X120 1
610 944-464 TAPER SHANK DRILL BIT D21.5X140 1
611 303-617

TAPER SHANK ADAPTER (SDS PLUS) NO.1

1
612 303-618

TAPER SHANK ADAPTER (SDS PLUS) NO.2

1
613 303-619 A-TAPER SHANK ADAPTER (SDS PLUS) 1
614 303-620 B-TAPER SHANK ADAPTER (SDS PLUS) 1
615 944-477 COTTER 1
616 303-332 HAMMER DRILL CHUCK SET 13MM 1 INCLUD.617,618
617 303-334 CHUCK HANDLE 1
618 303-335 RUBBER CAP 1
619 302-976

ANCHOR SETTING ADAPTER A (SDS+)W1/4X260L

1
620 302-975

ANCHOR SETTING ADAPTER A(SDS+)W5/16X260L

1
621 303-621

ANCHOR SETTING ADAPTER A (SDS+)W3/8X160L

1
622 302-974

ANCHOR SETTING ADAPTER A (SDS+)W3/8X260L

1
623 302-979

ANCHOR SETTING ADAPTER B (SDS+)W1/4X260L

1
624 302-978

ANCHOR SETTING ADAPTER B(SDS+)W5/16X260L

1
625 303-622

ANCHOR SETTING ADAPTER B (SDS+)W3/8X160L

1
626 302-977

ANCHOR SETTING ADAPTER B (SDS+)W3/8X260L

1
627 971-794

ANCHOR SETTING ADAPTER A W1/4" (MANUAL)

1
628 971-795

ANCHOR SETTING ADAPTER A W5/16" (MANUAL)

1
629 971-796

ANCHOR SETTING ADAPTER A W3/8" (MANUAL)

1
630 971-797

ANCHOR SETTING ADAPTER A W1/2" (MANUAL)

1
631 971-798

ANCHOR SETTING ADAPTER A W5/8" (MANUAL)

1

DH20PB

*

ALTERNATIVE PARTS --- 5 ---

ITEM

NO.

CODE NO.

DESCRIPTION

REMARKS

NO.

USED

OPTIONAL ACCESSORIES

2 -- 02

632 971-799

ANCHOR SETTING ADAPTER B W1/4" (MANUAL)

1

633 971-800

ANCHOR SETTING ADAPTER B W5/16" (MANUAL)

1

634 971-801

ANCHOR SETTING ADAPTER B W3/8" (MANUAL)

1

635 971-802

ANCHOR SETTING ADAPTER B W1/2" (MANUAL)

1

636 971-803

ANCHOR SETTING ADAPTER B W5/8" (MANUAL)

1
637 982-684 CENTER PIN (A) 109L FOR CORE BIT D32-38 1
638 982-685

CENTER PIN (B) 104L FOR CORE BIT D45-90 1

639 982-672 CORE BIT (A) 25MM 1
640 982-673 CORE BIT (A) 29MM 1
641 982-674 CORE BIT (A) 32MM 1 INCLUD.642
642 982-686 GUIDE PLATE (FOR CORE BIT 32MM) 1
643 982-675 CORE BIT (A) 35MM 1 INCLUD.644
644 982-687 GUIDE PLATE (FOR CORE BIT 35MM) 1
645 982-676 CORE BIT (A) 38MM 1 INCLUD.646
646 982-688 GUIDE PLATE (FOR CORE BIT 38MM) 1
647 982-677 CORE BIT (B) 45MM 1 INCLUD.648
648 982-689 GUIDE PLATE (FOR CORE BIT 45MM) 1
649 982-678 CORE BIT (B) 50MM 1 INCLUD.650
650 982-690 GUIDE PLATE (FOR CORE BIT 50MM) 1
651 303-625

CORE BIT SHANK (SDS PLUS) 25-38MM 105L 1

652 303-626 CORE BIT SHANK (SDS PLUS) 25-38MM 300L 1
653 303-627

CORE BIT SHANK (SDS PLUS) 45-90MM 300L 1

654 303-046

BULL POINT (SDS+) 250MM(ROUND SHANK TYPE)

1
655 303-044

CHEMICAL ANCHOR ADAPTER (SDS+)12.7MMX90L

1
656 303-045

CHEMICAL ANCHOR ADAPTER(SDS+)19.0MMX100L

1
657 303-820 DRILL CHUCK AND ADAPTER SET (SDS PLUS) 1 INCLUD.658,661
658 950-275 DRILL CHUCK 13VLR 1 INCLUD.659,660
659 930-515 CHUCK WRENCH 10G 1
660 981-122 SPECIAL SCREW M6X22 1
661 303-623 CHUCK ADAPTER (G) (SDS PLUS) 1
662 950-272 DRILL CHUCK 13VLA 1 INCLUD.659
663 303-624 CHUCK ADAPTER (D) (SDS PLUS) 1
664 971-511Z + DRIVER BIT (A) NO.2 25L 1
665 971-512Z + DRIVER BIT (A) NO.3 25L 1
666 306-885 DUST COLLECTOR (B) ASS’Y 1 INCLUD.667
667 306-910 SOCKET ADAPTER (B) 1
668 971-787 DUST CUP 1
669 931-844 STOPPER 1
672 981-840

GREASE (A) FOR HAMMER.HAMMER DRILL (30G)

1
673 308-471

GREASE FOR HAMMER.HAMMER DRILL (70G) 1

674 980-927

GREASE FOR HAMMER.HAMMER DRILL (500G)

1
675 320-612 SERVICE KIT (DH 24PB) 1 INCLUD.1,9,12-14,18,19,26,27,29,62,672

DH20PB

--- 6 ---

ITEM

NO.

CODE NO.

DESCRIPTION

REMARKS

NO.

USED

2 -- 02

Printed in Japan
(020205N)

DH20PB