HiKOKI DH24РМ User manual

MODEL

DH 24PM

ROTARY HAMMER

DH 24PM

Hitachi

Power Tools

TECHNICAL DATA

AND

SERVICE MANUAL



LIST No. E496 Sep. 2006

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

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:

Competitors

Symbols Utilized

Company Name

Model Name

BOSCH

MAKITA

GBH2-26DFR

HR2450T

Page

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

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

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

4. SELLING POINTS .......................................................................................................................... 2

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

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

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

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

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

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

6-2. Drilling Speed Comparison ........................................................................................................... 10

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

7. PRECAUTIONS IN SALES PROMOTION ................................................................................... 12

7-1. Handling Instructions .................................................................................................................... 12

7-2. Caution Plate ................................................................................................................................ 12

8. REFERENCE MATERIAL ............................................................................................................. 13

8-1. Lubrication .................................................................................................................................... 13

8-2. Tool Structure ................................................................................................................................ 13

8-3. "Three-mode" Changeover Mechanism ........................................................................................ 18

8-4. Caution when Using "Rotation Only" (No Hammering) Function .................................................. 20

8-5. Drill Bits ......................................................................................................................................... 21

8-6. Chuck Section ............................................................................................................................... 22

8-7. Dust Collector (B) ......................................................................................................................... 22

9. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY .......................................................... 24

9-1. Disassembly ................................................................................................................................. 24

9-2. Reassembly .................................................................................................................................. 30

9-3. Tightening Torque ......................................................................................................................... 33

9-4. Wiring Diagrams ........................................................................................................................... 34

9-5. Internal Wire Arrangement and Wiring Work ................................................................................ 35

9-6. Insulation Tests ............................................................................................................................. 37

9-7. No-load Current Values ................................................................................................................. 37

10. STANDARD REPAIR TIME (UNIT) SCHEDULES ..................................................................... 38

Assembly Diagram for DH 24PM

1. PRODUCT NAME

Hitachi Rotary Hammer, Model DH 24PM

2. MARKETING OBJECTIVE

The new Model DH 24PM is a 3-mode type rotary hammer based on the Model DH 24PC3 rotary hammer drill. It

can provide 3 modes of operation, "Rotation and hammering," "Rotation only" and "Hammering only."

In addition, the Model DH 24PM is equipped with a quick-release tool retainer that requires only two steps to

switch between the drill bit holder for use with SDS-plus bits and the drill chuck holder for drilling holes in steel

and wood easily and safely.

The main features of the Model DH 24PM are as follows:

(1) The tool retainer requires only two steps to switch between the drill bit holder for use with SDS-plus bits and

the drill chuck holder for drilling holes in steel and wood easily and safely.

(2) Class-top drilling speed

(3) More comfortable and frisky drilling

(4) Long service life and high durability thanks to the internal pressure adjustment mechanism

(5) Non-slip double-layer molded handle and gear cover

3. APPLICATIONS

(1) Rotation and hammering function (When the drill bit holder is mounted)

Drilling anchor holes

Drilling holes in concrete, tile, brick and similar materials

(2) Rotation only function (When the drill chuck holder is mounted)

Drilling holes in steel and wood

Tightening and loosening machine screws and wood screws

(3) Hammering only function (When the drill bit holder is mounted)

Light-duty chiselling of concrete

Groove digging and edging

[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

--- 1 ---

4. SELLING POINTS

Quick-release tool retainer requires only two steps to switch between the drill bit holder and the drill chuck holder Class-top drilling speed More comfortable and frisky drilling

Non-slip double-layer molded gear cover

4-1. Selling Point Descriptions

Compact body

Non-slip double-layer molded handle

Internal pressure adjustment mechanism

4-1-1. Quick-release tool retainer requires only two steps to switch between the drill bit holder and the drill

chuck holder

The Model DH 24PM is equipped with a quick-release tool retainer that requires only two steps to switch between

the drill bit holder for use with SDS-plus bits and the drill chuck holder for drilling holes in steel and wood. To

remove the drill bit holder or the drill chuck holder, turn the lock grip to unlock then pull for prevention of

inadvertent dropping. To mount the drill bit holder or the drill chuck holder, simply turn and push the lock grip in.

4-1-2. Selectable from 3 modes, "Rotation and hammering", "Rotation only" and "Hammering only"

The new Model DH 24PM is a 3-mode type rotary hammer based on the Model DH 24PC3 rotary hammer drill. It

features the "Hammering only" mode in addition to the "Rotation and hammering" mode and the "Rotation only"

mode. The "Hammering only" mode is available not only for light-duty chipping by means of bull points but also

for groove digging and edging by means of cold chisels and cutters for various applications.

4-1-3. Variable lock mechanism

With the variable lock mechanism, the tip angle of a tool such as a cold chisel or a cutter is selectable from

36 levels and can be locked in the "hammering only" mode. Thus the tip of a tool can be properly positioned

according to the application.

--- 2 ---

4-1-4. Class-top drilling speed

The drilling speed of the Model DH 24PM is 1.1 times higher than B thanks to the efficient transmission of the

hammering energy.

4-1-5. More comfortable and frisky drilling

The Model DH 24PM can drill holes more comfortably and friskily with a light pushing force because the quantity

of body jumping is 20% less than B.

4-1-6. Internal pressure adjustment mechanism

By minimizing variations in the internal pressure during operation, hammering operation is stabilized. In addition,

idling and grease leakage can be prevented.

4-1-7. Non-slip double-layer molded gear cover

The double-layer molded gear cover consists of a plastic resin base covered with a soft resin to ensure ease of

operation and a non-slip grip during chipping.

4-1-8. Non-slip double-layer molded handle

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

and non-slip grip.

4-1-9. Compact body: Entire length 351 mm

The Model DH 24PM has the same helical driving structure as the Model DH 24PC3 to make the entire length as

short as possible to 384 mm. The Model DH 24PM has the shortest body in the class.

Maker/Model

HITACHI DH 24PM

Entire length when mounting

the drill bit holder

384 mm (15-1/8")

407 mm (16")

384 mm (15-1/8")

Entire length when mounting

the drill chuck holder

430 mm (16-15/16")

440 mm (17-5/16")

430 mm (16-15/16")

--- 3 ---

5. SPECIFICATIONS

5-1. Specifications

Model

Capacity

Power source

Concrete

Steel

Wood

DH 24PM

3.4 --- 24 mm (1/8" --- 15/16")

13 mm (1/2")

32 mm (1-1/4")

AC single phase 50 Hz or 60 Hz

Voltage, current and power input

Voltage (V)

Current (A)

110

7.6

120

7.0

Power input (W)

Rotation speed

No-load

Full-load

Full-load blow rate

Type of motor

Forward: 0 to 1,150 min-1, Reverse: 0 to 550 min

0 to 890 min

0 to 4,600 min

-1

AC single-phase commutator motor

Type of switch Speed control switch with reversing switch

Type of handle

Enclosure

Gun-type handle of main body and side handle

Housing

•••

Glassfiber reinforced polyamide resin (green and black)

Handle cover Gear cover

•••••••••••

Glassfiber reinforced polyamide resin (cool gray and black)

220

3.8

800

230

3.6

-1

240

3.5

Weight

Packaging

Standard accessories

Net*

Gross

2.6 kg (5.7 lbs.)

4.7 kg (10.4 lbs.)

Plastic case

(1) Plastic case

(2) Side handle

(3) Depth gauge

(4) Drill chuck holder

*: Weight excludes cord and side handle.

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

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

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

--- 4 ---

5-2. Optional Accessories

A. Drilling anchor holes (Rotation and hammering)

Drill bit (slender shaft)

(1) Drill bit (slender shaft)

Outer dia. (mm)

3.4 (1/8")

3.5 (9/64")

Drill bit (taper shank)

(1) Drill bit (taper shank)

(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")

21.5 (27/32")

Effective length (mm)

Drill bit (slender shaft)

45 (1-25/32")

Code No.

944460 944461 993038 944462 944500 944463

944464

(2) Adapter for slender shaft

(SDS-plus shank)

Overall length (mm)

90 (3-17/32")

(2) Taper shank adapter

(SDS-plus shank)

(2) Taper shank adapter

Type

Morse taper

No. 1

Morse taper No. 2 303618

Code No.

303617

306369

306368

Adapter for slender shaft

Code No.

306370

(3) Cotter

Code No.

944477

Code No.Part name

A-taper

B-taper

13 mm hammer drill chuck

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

303619

303620

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

Straight-shank bit for impact drills

Part name

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

Chuck wrench

Rubber cap

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

Code No.

303332

303334

303335

--- 5 ---

Chuck wrench

B. Anchor setting (Hammering only)

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

Anchor setting bar

Anchor setting adapter (SDS-plus shank)

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

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

Overall length

260 260 160 260

Code No.

971794 971795 971796 971797 971798

Code No.

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-1/2 Anchor setting adapter-B W-5/8 Anchor setting adapter-B

Part name

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

External cone type

Part name

External cone type

Overall length

260 260 160 260

Code No.

971799 971800 971801 971802 971803

Code No.

302979 302978 303622 302977

C. Large hole boring (Rotation and hammering)

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

(Guide plate) Center pin Core bit Core bit 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) Core bit (outer diameter) 32, 35, 38 mm (1-1/4", 1-3/8", 1-1/2") Code No. 982684

Center pin (B) Core bit (outer diameter) 45, 50 mm (1-25/32", 2") Code No. 982685

(2) Guide plate

Core bit (outer diameter ) (mm)

32 (1-1/4")

35 (1-3/8")

38 (1-1/2")

45 (1-25/32")

Code No.

(SDS-plus shank)

Core bit (outer diameter ) (mm)

982686

982687

982688

982689

50 (2")

Code No.

982690

--- 6 ---

(3) Core bit with guide plate (The guide plate is not supplied with 25 mm (31/32") and 29 mm (1-5/32") outer

diameter core bits.)

Outer diameter (mm)

25 (31/32")

29 (5/32")

32 (1-1/4")

35 (1-3/8")

38 (1-1/2")

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

Core bit shank (A)

Core bit shank (B)

D. Bolt placing operations with chemical anchor (Rotation and hammering)

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

Core bit (outer diameter) 45 --- 50 mm

Code No.

982672

982673

982674

982675

982676

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

(1-25/32" --- 2")

Outer diameter (mm)

45 (1-25/32")

50 (2")

Overall length 105 mm (4-1/8")

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

Overall length 300 mm (11-52/64") Code No. 303627

Code No.

982677

982678

Code No. 303625

Code No. 303626

(Standard sockets available on the market)

Part name

12.7 mm (1/2") Chemical anchor adapter

19 mm (3/4") Chemical anchor adapter

E. Crushing operations (Hammering only)

Bull point (round type)

(SDS-plus shank)

Code No. 303046 Code No. 316656

F. Groove digging and edging (Hammering only)

Cold chisel (SDS-plus shank)

Code No. 316657 Code No. 316658

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

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

Code No.

303044

303045

Continuous chipping operation

can cause temperature rise of the

Square bull point

(SDS-plus shank)

Cutter (SDS-plus shank)

main body, resulting in failure.

Rest the Model DH 24PM about

30 minutes after continuous

operation for 15 minutes.

Continuous chipping operation

can cause temperature rise of the

main body, resulting in failure.

Rest the Model DH 24PM about

30 minutes after continuous

operation for 15 minutes.

--- 7 ---

G. Grooving (Hammering only)

Grooving chisel (SDS-plus shank)

Code No. 316659

H. Driving screws (Rotation only)

(1) Cross-recessed head (Phillips) bit

[Overall length: 70 mm]

(For use with cross-recessed head (Phillips) screw)

Stamped bit No.

Bit No.

No. 2

No. 3

I. Grease for electric impact drill

Containing 500 g (17.64 oz): Code No. 980927

Code No.

955654

955655

Applicable screw dia. (mm)

4 --- 5

6 --- 8

(2) Slotted-head (minus) bit

[Overall length: 50 mm]

(For use with slotted-head (minus) screw)

Tip thickness

Bit tip thickness

0.8

Code No.

955658

955673

Applicable screw dia. (mm)

5 --- 6

Containing 30 g (1.06 oz): Code No. 981840

70 g (2.5 oz): Code No. 308471

J. Dust cup, dust collector (B)

Dust cup Dust collector (B) ass'y

Code No. 971787 Code No. 306885

--- 8 ---

6. COMPARISONS WITH SIMILAR PRODUCTS

6-1. Specification Comparisons

Maker • Model

Item

Concrete

Nominal capacity

Steel

Wood

Power consumption

Forward

No-load speed

Reverse

Full-load speed

Weight

When mounting the drill bit holder

When mounting the drill chuck holder

Entire

length

Height

Dimensions

Width

Forward/reverse changeover switch

Tool retainer

Double-layer

Function

molding

Gear cover

Handle

Changeover mode

HITACHI

DH 24PM

24 mm

13 mm

32 mm

800 W

0 --- 1,150 min

0 --- 550 min

0 --- 4,600 min

-1

(rpm)

-1

(rpm)

-1

(rpm)

2.6 kg (5.7 lbs.)

384 mm (15-1/8")

430 mm (16-15/16")

198 mm (7-51/64")

78 mm (3-1/16")

Provided

(Push-button type)

One-push type

Provided

3 modes

26 mm

13 mm

30 mm

800 W

0 --- 900 min-1 (rpm)

0 --- 900 min

0 --- 4,000 min

-1

(rpm)

-1

(rpm)

2.9 kg (6.4 lbs.)

407 mm (16")

2.6 kg (5.7 lbs.)

384 mm (15-1/8")

24 mm

13 mm

32 mm

780 W

0 --- 1,100 min

0 --- 600 min

0 --- 4,500 min

-1

440 mm (17-5/16") 430 mm (16-15/16")

210 mm (8-1/4")

84 mm (3-5/16")

Provided

(CB rotary type)

One-push type

Not provided

204 mm (8-1/32")

72 mm (2-27/32")

Provided

(Lever type)

One-push type

Not provided

Provided Provided

3 modes3 modes

-1

* Weight excludes cord and side handle.

--- 9 ---

6-2. Drilling Speed Comparison

Drilling speed varies considerably depending on the work conditions. Use the factory test results shown in Fig. 1

for comparison purpose only.

800

700

600

500

400

300

Drilling speed (mm/min.)

200

100

HITACHI DH 24PM

108

18161412

Drilling bit diameter (mm)

Fig. 1

[Test conditions]

Direction : Downward drilling

Pushing force : 98 N (10 kgf)

Test material : Concrete panel with a compression strength of 2,352 N/cm2 (240 kgf/cm2)

--- 10 ---

6-3. Chiseling Performance Comparison

Chiseling performance varies considerably depending on the work conditions. Use the factory test results shown

in Fig. 2 for comparison purposes only.

Voltage

supply

230 V

Maker

HITACHI

Model

DH 24PM

Chiseling amount (kg/30 min.)

105

Fig. 2

--- 11 ---

7. PRECAUTIONS IN SALES PROMOTION

In the interest of promoting the safest and most efficient use of the Model DH 24PM Rotary Hammer by all of 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 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 Rotary Hammer 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.

7-2. Caution Plate

The Model DH 24PM unit is provided with a Caution Plate (illustrated below) which lists basic safety precautions

in use. Carefully ensure that the customer fully understands and follows these precautions before using tool.

For Australia and New Zealand

For the U.S.A. and Canada

--- 12 ---

+ 33 hidden pages

HiKOKI DH24РМ User manual

Specifications and Main Features

Frequently Asked Questions

User Manual

CONTENTS

1. PRODUCT NAME

2. MARKETING OBJECTIVE

3. APPLICATIONS

4. SELLING POINTS

4-1. Selling Point Descriptions

5. SPECIFICATIONS

5-1. Specifications

5-2. Optional Accessories

6. COMPARISONS WITH SIMILAR PRODUCTS

6-1. Specification Comparisons

6-2. Drilling Speed Comparison

6-3. Chiseling Performance Comparison

7. PRECAUTIONS IN SALES PROMOTION

7-1. Handling Instructions

7-2. Caution Plate