Hitachi DH 40SR Instruction manual

POWER TOOLS

TECHNICAL DATA

AND

SERVICE MANUAL

ROTARY HAMMER

DH 40SR

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

LIST No. E471 Apr. 2003

MODEL

DH 40SR

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:

Symbols Utilized Competitors

Company Name Model Name

MAKITA HR3811

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 .......................................................................................................................... 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 ......................................................................................................... 10

6-3. Chiseling Performance Comparison ..............................................................................................11

7. PRECAUTIONS IN SALES PROMOTION ....................................................................................11

7-1. Handling Instructions .....................................................................................................................11

7-2. Caution Plate .................................................................................................................................11

8. REFERENCE INFORMATION ...................................................................................................... 12

8-1. Grease Replacement.................................................................................................................... 12

8-2. O-Ring Replacement .................................................................................................................... 12

8-3. Structure of the Model DH 40SR Rotary Hammer........................................................................ 13

9. REPAIR GUIDE ............................................................................................................................ 17

9-1. Disassembly ................................................................................................................................. 17

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

9-3. Screw Locking Agent TB1401....................................................................................................... 25

9-4. Tightening Torque ......................................................................................................................... 25

9-5. Internal Wiring............................................................................................................................... 25

9-6. Insulation Tests ............................................................................................................................. 26

9-7. No-load Current Value .................................................................................................................. 26

10. STANDARD REPAIR TIME (UNIT) SCHEDULES ..................................................................... 27

Assembly Diagram for DH 40SR

--- 1 ---

1. PRODUCT NAME

Hitachi Rotary Hammer, Model DH 40SR

2. MARKETING OBJECTIVE

The Model DH 40SR is an upgraded version of the current Model DH 40SA, which features the use of Hitachi

13 mm hexagonal tools. The performance, durability and operability are greatly improved. With this competitive

Model DH 40SR, we aim to enhance the share of Hitachi 13 mm hexagonal shank type rotary hammers.

The main specifications are as follows:

(1) High drilling speed with low vibration and noise level

(2) Self-drilling (Good feeling)

(3) Internal double-insulation construction with sturdy aluminum frame

(4) Constant speed control

(5) Soft-touch grip for easier handling

(6) Ahighly reliable mechanism for prevention of idle hammering and shock-absorbing mechanism results in

prolonged service life and comfortable operation.

(7) Avery original design

3. APPLICATIONS

Drilling holes in concrete and drilling anchor holes

Demolishing and chiseling of concrete. Edging, gravel road digging, compacting and tamping, grooving,

cutting, stripping and roughing, etc.

[Application examples]

Air conditioning Piping and wiring Electric fixtures

Sanitary facilities Interior finishing Other building, construction and repair work

4. SELLING POINTS

Needle-pin type slip clutch

Internal double-insulation construction

with sturdy aluminum frame

Soft-touch grip handle

for easier handling

Soft-touch grip side-handle

for easier handling

High drilling speed with low vibration and noise level

Self-drilling (Good feeling)

A very original design

A highly reliable mechanism for prevention of idle

hammering and shock-absorbing mechanism results

in prolonged service life and comfortable operation.

Constant speed control

--- 2 ---

4-1. Selling Point Descriptions

4-1-1. High drilling speed with low vibration and noise level

The drilling speed is 10 % faster than that of similar products thanks to efficient striking energy transmission.

Even so, the Model DH 40SR produces lower vibration and noise levels than those of similar products.

Maker •Model

Ratio of drilling speed %

Full-load vibration level dB (VL)

m/s2

HITACHI

DH 40SR

100

118

4-1-2. Self-drilling (Good feeling)

Thanks to the computer-simulated optimum striking characteristics, the quantity of body jumping is less than that

of the current Model DH 40SA and the working tool smoothly penetrates into the workpiece with a light pressing

force. The Model DH 40SR realizes quicker self-drilling with better impact feeling.

4-1-3. Internal double-insulation construction with sturdy aluminum frame

The aluminum die-cast outer frame is very sturdy (same as the Models H 45MR/H 45SR and DH 40MR).

In addition, a plastic internal S holder is adopted to realize double-insulation construction. Thus the housing has

greater rigidity and the double-insulated motor has greater durability. The Model DH 40SR is heavy-duty and the

service life of the carbon brush is greatly prolonged (1.5 times longer than the conventional one) minimizing

disconnection of the armature, deviation of the core and grease leakage.

4-1-4. Constant speed control

The Model DH 40SR is equipped with a built-in electronic control circuit that can keep constant speed in either no-

load operation or actually loaded operation. The Model DH 40SR provides better operability and stable, efficient

drilling performance even if the load varies because the constant speed control minimizes changes in speed and

number of hammering.

4-1-5. Soft-touch grip for easier handling

The double-layer molded handle consists of a nylon resin base covered with a soft plastic layer to ensure a soft

touch and firm, non-slip grip of the handles.

Full-load noise level dB (A)

No-load noise level dB (A)

8.0

HITACHI

DH 40SA

118

8.0

120

10.2

* Each product used a 25-mm dia. drill bit for the above measurement.

--- 3 ---

5. SPECIFICATIONS

5-1. Specifications

Capacity

Power source

Current

Power input

Switch

Type of handles

Impact rate

Weight

Packaging

Standard accessories

Drill bit (Max. diameter): 40 mm (1-9/16")

Core bit (Max. diameter): 120 mm (4-3/4")

AC single phase 50 Hz or 60 Hz

950 W

Trigger switch

D-shaped handle and side handle

No load and full load: 2,800 min-1

Product: 6.5 kg (14.3 lbs.); excluding cord and side handle

Packed: 10.0 kg (22.1 lbs.)

Corrugated cardboard box with plastic tool case

• Plastic case •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1

• Side handle ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1

• Hex. bar wrench (for M6) •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1

• Hex. bar wrench (for M5) •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1

• Hex. bar wrench (for M4) •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1

• Stopper ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1

• Grease (A) •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1

Voltage 110 V

10 A 230 V

4.8 A

Enclosure

Motor type AC single-phase series commutator motor

Materials: Aluminum alloy die casting

Nylon resin (Handle, handle cover, tail cover and crank cover)

Paint : Silver green metallic, black

Double insulation

Insulation structure

Rotation rate No load and full load: 510 min-1

4-1-6. A highly reliable mechanism for prevention of idle hammering and shock-absorbing mechanism results in

prolonged service life and comfortable operation

Conventional mechanism for prevention of idle hammering is to open and close the air holes according to the

movement of the striker. The Model DH 40SR has air holes located at the position unaffected by the rebound of

the striker at no load. The air holes are opened and closed by the movement of slide sleeve (A) provided around

the cylinder that interlocks with the tool and the second hammer to prevent to idle hammering. This mechanism

securely prevents idle hammering even if the striker rebounds heavily when drilling holes using a large-diameter

drill bit. The Model DH 40SR has prolonged service life and improved operability even in the operation that

requires care not to destroy the surroundings.

At the instance of releasing the working tool from the workpiece by moving the main body up, the second hammer

contacts driver then the cushion (damper (B)) provided between driver holder and front cover absorbs the striking

force of the second hammer. Thus the Model DH 40SR has greater durability than the similar products.

4-1-7. Needle-pin type slip clutch

The Model DH 40SR is equipped with a needle-pin type slip clutch for higher slip torque accuracy and enhanced

safety (same as the Model DH 40SA).

--- 4 ---

5-2. Optional Accessories

1. Drilling work for through-holes (rotation + hammering)

(1) Drill bit (taper shank) (2) Taper shank adapter

(3) Cotter

(1) Drill bit (hexagon shaft)

Outer diameter (mm)

16 (5/8")

18 (11/16")

19 (3/4")

20 (25/32")

22 (7/8")

25 (1")

28 (1-1/8")

30 (1-3/16")

32 (1-1/4")

35 (1-3/8")

38 (1-1/2")

40 (1-9/16")

280 (11")

Code No.

985721

985724

985727

985730

985733

985736

985739

313322

Outer length (mm)

2. Drilling work for anchor holes (rotation + hammering)

1 Drill bit (Taper shank)

(1) Drill bit (Taper shank)

Outer diameter (mm)

11 (7/16")

12.3 (15/32")

12.7 (1/2")

14.3 (9/16")

14.5 (9/16")

17.5 (11/16")

Code No.

944460

944461

993038

944462

944500

944463

(2) Taper shank adapter

Taper dimension Code No.

Morse taper No. 1 985750

(3) Cotter

Code No.

944477

400 (15-3/4")

Code No.

985720

985723

985726

985729

985732

985735

985738

505 (19-7/8")

Code No.

985722

985725

991334

985728

985731

985734

985737

985740

550 (21-5/8")

Code No.

991330

991331

991332

991333

991335

991336

991337

991338

991339

991340

991341

21.5 (7/8") 944464 Morse taper No. 2 985751

--- 5 ---

985754

985755

Taper shank adapters for A-taper or

B-taper shanks are provided as optional

accessories. Taper shank drill bits are

not provided.

A-taper

B-taper

9.7 mm (3/8") x 1/20 Taper (A)

12.9 mm (1/2") x 1/20 Taper (B)

For Australia

K-taper shank adapter 992813

(1) Drill bit (ratio shank) (2) Ratio shank adapter

Code No. 985761

A ratio shank adapter is provided as an optional accessory, but corresponding drill bits are not provided.

3. Boring work for large-dia. holes (rotation + hammering)

(1) Guide plate (2) Center pin (3) Core bit (4) Core bit shank

(1) Guide plate

Core bits with outer diameter of 32, 35, 38, 45, 54, 64, 79, 94, 105, 120 mm (1-1/4", 1-3/8", 1-1/2", 1-3/4",

2-1/8", 2-2/1", 3-1/8", 3-1/16", 4-1/8", 4-3/4")

[Guide plate is not used with core bits with outer diameter of 25 mm (1") and 29 mm (1-1/8")]

(2) Center pin

Code No. 956009 for core bits with outer diameter of 32, 35 mm (1-1/4", 1-3/8")

Code No. 955165 for core bits with outer diameter of 38, 45, 54, 64, 79, 94, 105, 120 mm

(1-1/2", 1-3/4", 2-1/8", 2-1/2", 3-1/8", 3-11/16", 4-1/8", 4-3/4")

[Center pin is not used with core bits with outer diameter of 25 mm (1") and 29 mm (1-1/8").]

(3) Core bit

Outer diameter (in.)

25 mm (1")

29 mm (1-1/8")

32 mm (1-1/4")

35 mm (1-3/8")

38 mm (1-1/2")

45 mm (1-3/4")

Code No.

955994

955995

955996

955998

956000

955154

Outer diameter (in.)

54 mm (2-1/8")

64 mm (2-1/2")

79 mm (3-1/8")

94 mm (3-11/16")

105 mm (4-1/8")

120 mm (4-3/4")

Code No.

955155

986002

955157

956004

955159

956006

(4) Core bit shank

Code No. 956008 for core bits with outer diameter of 25, 29, 32, 35 mm (1", 1-1/8", 1-1/4", 1-3/8")

Code No. 955163 for core bits with outer diameter of 38, 45, 54, 64, 79, 94, 105, 120 mm

(1-1/2", 1-3/4", 2-1/8", 2-1/2", 3-1/8", 3-11/16", 4-1/8", 4-3/4")

--- 6 ---

(1) Anchor size

W1/4" (No. 20)

W5/16" (No. 25)

W3/8" (No. 30)

W1/2" (No. 40)

W5/8" (No. 50)

Code No.

985756

985757

985758

985759

985760

(1) Anchor adapter (for rotation + hammering)

Anchor size W1/4" (No. 20), W5/16" (No. 25), W3/8" (No. 30),

W1/2" (No. 40), W5/8" (No. 50)

(5) Core bit for efficient drilling

Center pin (C)

Outer diameter (in)

65 mm (9-2/16")

80 mm (3-5/32")

90 mm (3-1/2")

100 mm (3-15/16")

105 mm (4-1/8")

Code No.

903901

Core bit (with guide plate)

Code No.

992819

Core bit shank

Code No.

992814

992815

992816

992817

992818

4. Anchor work for self-drilling anchors (rotation + hammering)

(2) Drift key (Code No. 944574)

5. Anchor work for self-drilling anchors (hammering)

(1) Anchor adapter (for hammering)

Anchor size: W3/8" (No. 30), W1/2" (No. 40)

W5/8" (No. 50)

(2) Turning handle (Code No. 944573)

(3) Drift key (Code No. 944574)

(1) Anchor size

W3/8" (No. 30)

W1/2" (No. 40)

W5/8" (No. 50)

Code No.

981929

981930

981931

--- 7 ---

(1) Bull point

6. Demolition work (hammering)

280 mm

450 mm

Overall length Code No.

981922

981923

7. Grooving and edging work (hammering)

(1) Cold chisel

280 mm

450 mm

Overall length Code No.

981925

981926

(1) Cutter

280 mm (11")

Width

45 mm (2")

8. Cutting and stripping (asphalt cutting, etc.) (hammering)

Code No.

981924

9. Digging work (substitute pick-ax) (hammering)

(1) Scoop

405 mm (16")

Overall length Code No.

956126

Overall length: 280 mm (11"), 450 mm (17-3/4")

Overall length

10. Roughing surface work (hammering)

(1) Bushing tool

(2) Shank

250 mm (10")

Overall length Code No.

955186

Code No. 955183

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