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
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