Hitachi DH 28PC Handbuch

PRODUCT NAME

Hitachi Rotary Hammer

Model DH 28PC

[ NEW FEATURES ]

Most compact body in its class

Highest demolition performance in its class

Equipped with a reversing switch

[ SAME FEATURES AS CONVENTIONAL MODELS ]

3-mode changing and variable lock mechanism fo

easy working-angle adjustment of chisels, etc.

Idle striking prevention mechanism with catch

ring method

One push type of bit mounting

Internal pressure adjustment mechanism

Easy-to-operate and double-molded switch handle

and side handle

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.

This product features a maximum bit diameter of 28 mm, the capability to drill holes in concrete and other hard

materials, the mounting SDS-plus shank bits," and three modes (Rotation + Hammering, Rotation only, and

Hammering only) that enable chipping and groove-cutting work. This 3-mode type of product offers improved

drilling/chipping performance, as well as reduced product size and weight. This product together with the dust-

collection type of product (DH 28PD) developed at the same time forms a continuous lineup of D-shaped handle

rotary hammer drills in order to promote the sharing of these products.

(1) Rotation and hammering function

• Drilling anchor holes. Drilling holes in concrete, tile, brick and similar materials. Large hole boring with core bit.

(2) Rotation only function

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

(with chuck adapter).

(3) Hammering only function

• Stripping mortar and tiles. Demolishing and chiseling of concrete. Grooving and cutting of bricks.

MARKETING OBJECTIVE

APPLICATIONS

SELLING POINTS

LIST No. F408

Dec. 2009

Sales Division

REMARK:

• For more information about HANDLING INSTRUCTIONS, visit our website at:

http://www.hitachi-koki.com/manual_view_export/

• 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:

Competitors

Symbols Utilized

Company Name Model Name

B BOSCH GBH3-28E

C MAKITA HR2811F

CONTENTS

Page

SELLING POINTS ------------------------------------------------------------------------------------------------------------- 1

SPECIFICATIONS ------------------------------------------------------------------------------------------------------------- 4

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

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

COMPARISON WITH SIMILAR PRODUCTS--------------------------------------------------------------------------10

1. Comparison of Specifications----------------------------------------------------------------------------------------------------- 10

2. Comparison of Drilling Speed ---------------------------------------------------------------------------------------------------- 11

PRECAUTIONS ON SALES PROMOTION ----------------------------------------------------------------------------12

1. Safety Instructions ---------------------------------------------------------------------------------------------12

REFERENCE MATERIALS-------------------------------------------------------------------------------------------------13

REPAIR GUIDE----------------------------------------------------------------------------------------------------------------17

1. Precautions on Disassembly and Reassembly ---------------------------------------------------------17

STANDARD REPAIR TIME (UNIT) SCHEDULES--------------------------------------------------------------------29

Assembly Diagram for DH 28PC

-1-

C: Outlined shape

B: Outlined shape

HITACHI DH 28PC: 316 mm (for C: -4 mm, for B: -16 mm)

C: 320 mm

B: 332 mm

HITACHI DH 28PC, B: 208 mm

(C: -17 mm)

C: 225 mm

HITACHI DH 28PC shape

Most compact body in its class

By downsizing and optimizing the motor and mechanism components, Hitachi significantly reduced overall

product length to achieve the most compact body in this class of product.

Model HITACHI

DH 28PC CB

Full length (mm) 316 320 332

SELLING POINTS

*Based on our own research

-2-

• Comparison of chiseling amounts (Test results obtained at Hitachi factory)

* The chiseling amount is dependent upon test conditions.

* “C” has no "Hammering" mode.

05101520 25 30

25.2

18.2

HITACHI

DH 28PC

Highest demolition performance in its class

Hitachi achieved the highest demolition performance in this class of product by optimizing the hammering

properties.

Equipped with a reversing switch

This product is equipped with a reversing pushbutton switch.

The user can select either forward rotation (clockwise) or backward rotation (counterclockwise) by simply

pressing the pushbutton.

Refer to the Technical Data and Service Manual for the model indicated below.

3-mode changing and variable lock mechanism for easy

working-angle adjustment of chisels, etc.

This product adopts Hitachi's unique mode selection mechanism: two standard modes of "Rotation +

hammering" and "Rotation" and one additional mode of "Hammering." These modes enables not only light

chiseling work using bull points but also heavy work using cold chisels and cutters such as groove digging

and cornering work, thereby expanding the range of product use.

The user can easily mount a bit in any of 12 angle positions by simply setting the change lever to the

"neutral" position and turning the bit.

Idle striking prevention mechanism with catch-ring method

This product adopts a catch-ring type of idle hammering prevention mechanism.

When the bit tool of the product is detached from an object under no load, air flows in and out through

cylinder air holes to maintain uniform air pressure in the chamber. As a result, the hammering action stops.

In this case, the projection at the tip of the striker fits into the O-ring (A) provided between damper holders

(A) and (B) to prevent the air holes from being blocked by the recoiling striker.

DH 24PC2 / No. E479, DH 24PC3 / No. E489, DH 30PC2 / No. E494

*Based on our own

research

Chiseling amount (kg/30 min.)

-3-

One-push type of bit mounting

This product adopts a one-push quick bit mounting system without needing grip operation.

First, fully insert the bit tool into the front cap hole until it stops, and then turn the bit tool while slightly

pushing the bit tool. When the bit tool catches, push the bit tool there until it stops.

Internal pressure adjustment mechanism

An air passage is provided to connect inside the crankcase to the outside with a felt packing in the air

passage. This passage only allows air (pressure) to pass and suppresses fluctuations in internal pressure.

This stabilizes the hammering action and prevents idle striking and the leakage of grease.

Easy-to-operate and double-molded switch handle and

side handle

The switch handle and side handle both feature a two-layer structure in which the plastic resin molded

base is fully coated with a soft plastic resin. This gives the switch and side handles a soft feeling, and

improves handle operability.

Crank cover

Felt packing

Felt packing (B)

Rubber seal

(

Inside the crankcase

)

Air passage

Frontcap Gri

Tool

-4-

1. Specifications

Model DH 28PC

Drill bit (Max. dia.): Concrete 28 (1-1/8”)

Steel 13 (1/2”)

Wood 32 (1-1/4”)

Capacity mm

Core bit (Max. dia.): 80 (3 -5/32”)

Power source

AC single phase 50 Hz or 60 Hz

Voltage V110 120 220 230 240

Current A6.9 6.3 3.4 3.3 3.2

Power input W720

Type of motor

AC single-phase commutator motor

Enclosure

Materials : Nylon resin (Handle (A). (B), tail cover, crank cover)

Polycarbonate resin (Housing)

Aluminum alloy die casting

(Crank case, cylinder case, gear cover)

Colors : Green gray, green, black

Type of switch

Variable trigger switch

Types of handles

D-shaped handle and side handle

Full load rotation rate min-1 0 – 800

Full load impact rate min-1 0 – 4,000

Product* 3.5 (7.7)

Weight

Packed

kg (lbs.)

6.5 (14.3)

Packaging

Plastic case

Standard accessories

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

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

• Stopper ----------------------------------------------------------1

* Excluding the cord and side handle

SPECIFICATIONS

-5-

2. Optional Accessories

(1) Drilling work for through-hole drilling (rotation + hammering)

Drill bit (SDS plus shank)

D (mm) L1 (mm) L2 (mm) Code No. D (mm) L1 (mm) L2 (mm) Code No.

4.0 303571 12.5 166 100 303592

4.3 303572 12.5 260 200 303607

4.5 303573 12.7 166 100 303593

4.8 303574 12.7 260 200 303608

5.0

110 50

303575 13.0 303594

5.0 160 100 303578 14.0 303595

5.5 303576 14.3

166 100

303596

6.0 110 50 303577 14.3 260 200 303609

6.0 303579 14.5 166 100 303597

6.4 303580 14.5 260 200 303610

6.5 303581 15.0 303598

7.0 303582 16.0 166 100 303599

7.5 303583 16.0 260 200 303611

8.0

160 100

303584 16.5 303600

8.5 160 100 303585 17.0 166 100 303601

9.0 303586 17.0 260 200 308485

9.5 303587 17.5 166 100 303602

10.0

160 100

303588 17.5 260 200 303612

10.0 260 200 303604 18.0 166 100 303603

10.5 160 100 303589 19.0 260 200 303613

10.5 260 200 303605 20.0 303614

11.0 160 100 303590 22.0 303615

12.0 166 100 303591 24.0

250 200

308486

12.0 260 200 303606 25.0 450 384 303616

-6-

(2) Drilling anchor holes (rotation + hammering)

Drill bit (taper shank)

(a) Drill bit (taper shank) (b) Taper shank adapter (c) Cotter

(SDS-plus shank)

(a) Drill bit (Taper shank) (b) Taper shank adapter (c) Cotter

Outer dia. (mm) Code No. Type Code No. Code No.

11.0 (7/16")

12.3 (1/2")

12.7 (1/2")

14.3 (9/16")

14.5 (9/16")

17.5 (11/16")

944460

944461

993038

944462

944500

944463

Morse taper

No. 1 303617

21.5 (7/8") 944464 Morse taper

No. 2 303618

944477

Part name Code No.

A-taper 303619

B-taper 303620

A taper shank adapter (A-taper or B-taper) is provided

as an optional accessory, but without the drill bit.

(3) Anchor setting (hammering only)

Anchor setting bar

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

Anchor setting adapter (SDS-plus shank)

Part name Overall

length

Code

No. Part name Overall

length

Code

No.

W-1/4 Anchor setting adapter-A

W-5/16 Anchor setting adapter-A

W-3/8 Anchor setting adapter-A

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

260

160

260

302979

302978

303622

302977

Internal cone type External cone type

• Anchor setting bar for manual anchor setting

Anchor setting adapter

Part name Code No. Part name Code No.

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

971794

971795

971796

971797

971798

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

971799

971800

971801

971802

971803

Internal cone type External cone type

-7-

(4) Large hole boring (rotation + hammering)

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

(a) Guide plate (b) Center pin (c) Core bit (d) Core bit shank

(SDS-plus shank)

(a) Guide plate

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

32 (1-1/4") 982686 50 (2") 982690

35 (1-3/8") 982687 65 (2-9/16") 982691

38 (1-1/2") 982688 80 (3-5/32") 982692

45 (1-3/4") 982689

(b) Center pin (Do not use bits with outer diameters of 25 mm (1") and 29 mm (1-1/8"))

Part name Code No.

Center pin (A) Core bit (outer diameter) 32, 35, 38 mm (1-1/4", 1-3/8", 1-1/2") 982684

Center pin (B) Core bit (outer diameter) 45, 50, 65, 80 mm (1-3/4", 2", 2-9/16", 3-5/32") 982685

(The guide plate is not supplied with 25 mm (1") and 29 mm (1-1/8") outer diameter core bits.)

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

25 (1") 982672 45 (1-3/4") 982677

29 (1-1/8") 982673 50 (2") 982678

32 (1-1/4") 982674 65 (2-9/16") 982679

35 (1-3/8") 982675 80 (3-5/32") 982680

38 (1-1/2") 982676

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

Part name Overall length Code No.

105 mm (4-1/8") 303625

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

(1" --1-1/2") 300 mm (12") 303626

Core bit shank (B) Core bit (outer diameter) 45 --80 mm

(1-3/4" --3-5/32") 300 mm (12") 303627

(5) Bolt placing operation with chemical anchor (rotation + hammering)

(Commercially available Chemical anchor adapter

standard socket) (SDS-plus shank)

Part name Code No.

12.7 mm (1/2") Chemical anchor adapter 303044

19.0 mm (3/4") Chemical anchor adapter 303045

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