Hitachi DH 28PC Technical Data And Service Manual

Brand: Hitachi

Model: DH 28PC

Category: Rotary hammers

Type: Technical Data And Service Manual

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

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.

51015

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

Front cap

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 V 110 120 220 230 240

Current A 6.9 6.3 3.4 3.3 3.2

Power input W 720

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

-8-

(6) Crushing operations (hammering only)

Bull point (round type) Square bull point

(SDS-plus shank) (SDS-plus shank)

Code No. 303046

Code No. 316656

(7) Groove digging and edging (hammering only)

Cold chisel Cutter

(SDS-plus shank) (SDS-plus shank)

Code No. 316657

Code No. 316658

(8) Grooving (hammering only)

Grooving chisel

(SDS-plus shank)

Code No. 316659

(9) Drilling holes and driving screws (rotation only)

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

Special screw 13 mm (1/2") Drill chuck Chuck adapter (G)

(13VLRB-D) (SDS-plus shank)

Chuck wrench

NOTE: When using the tool to loosen screws, open the three jaws of the drill chuck and

securely fix the drill chuck to chuck adapter (G) with the special screw (a left-hand threaded

M6 screw) for mounting the drill chuck onto chuck adapter (G).

Part name Code No.

Chuck adapter (G) for SDS-plus shank system 303623

13 mm (1/2") Drill chuck 13VLRB-D (with chuck wrench) 321814

Special screw (M6 left-hand threaded) 995344

-9-

• Cross-recessed head (Phillips) bit • Slotted-head (minus) bit

[Overall length: 70 mm] [Overall length: 50 mm]

(For use with cross-recessed head (Phillips) screws) (For use with slotted-head (minus) screws)

Bit No. Code No.

Applicable screw dia. (mm)

Bit tip thickness Code No.

Applicable screw dia. (mm)

No. 2 955654 4 -- 5 0.8 955658 4

No. 3 955655 6 -- 8 1.0 955673 5 -- 6

(10) Driving screws (rotation only)

• Plus driver bit and chuck adapter (D)

Plus driver bit Chuck adapter (D)

[overall length: 25 mm] (SDS-plus shank)

(for cross-recessed head screws)

Bit No. Screw size Code No. Part name Code No.

No. 2 3 -- 5 mm 971511Z

No. 3 6 -- 8 mm 971512Z

Chuck adapter (D) for SDS-plus

shank system

303624

(11) Grease for the hammer and hammer drill

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

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

70 g (2.50 oz.) Code No. 308471

(12) Dust cup, Dust collector

• Dust cup • Dust collector (B) ass’y

Code No. 971787

Code No. 306885

Stamped bit No.

Tip thickness

-10-

1. Comparison of Specifications (Superior specifications: )

Maker HITACHI

Model name DH 28PC

C B

Concrete 28 (1-1/8”) 28 (1-1/8”) 28 (1-1/8”)

Steel 13 (1/2”) 13 (1/2”) 13 (1/2”)

Drill bit dia.

Wood

32 (1-1/4”) 32 (1-1/4”) 32 (1-1/4”)

Capacity

Core bit dia. mm 80 (3-5/32”) 80 (3-5/32”) 80 (3-5/32”)

Power input W 720 800 720

Full-load rotation rate min

-1

0 – 800 0 - 1,100 (No-load) 0 - 800

Full-load impact rate min

-1

0 - 4,000 0 - 4,500 (No-load) 0 - 4,000

Impact energy J 3.5 2.9 3.3

No-load noise level

(measured)

dB(A)

85.4 86.3 87.2

Full-load noise level

(measured)

dB(A) 87.9 88.8 86.2

Full-load vibration level

(Tri-axial, measured)

m/s

20.7 20.1 27.4

Length 316 (12-7/16”) 320 (12-5/8”) 332 (13-1/16”)

Height 208 (8-3/16”) 225 (8-55/64”) 208 (8-3/16”)Tool size

Width

102 (4”) 89 (3-1/2”) 93 (3-21/32”)

Weight* kg (lbs.) 3.5 (7.7) 3.2 (7.0) 3.3 (7.3)

Mode

332

Mounting the drill bit

One push One push One push

Reversing switch

Equipped Equipped None

* Weight does not include the cord and side handle.

COMPARISON WITH SIMILAR PRODUCTS

-11-

• Comparison of drilling speed

2. Comparison of Drilling Speed

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

the figure below for comparison purposes only.

Direction : Downward drilling

Pushing force : 98 N (10 kgf)

Test material : Concrete panel with compression strength of 2,352 N/cm

(240 kgf/cm

)

100

200

300

400

500

600

700

10 12 14 16 18 20 22 24 26 28

Drill Bit Dia. (mm)

Drilling Speed (mm/min)

HITACHI DH28PC

HITACHI DH30PC2

HITACHI DH25PB

-12-

1. Safety instructions

In the interest of promoting the safest and most efficient use of the Model DH 28PC Rotary Hammers by all

of our customers, it is very important that when concluding a sale that the salesperson carefully ensure that

the buyer seriously recognizes the importance of the Handling Instructions, and fully understands the

precautions listed on the Caution Plate and Name Plate attached to each tool.

A. 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 tool cannot be completely eliminated.

Accordingly, the Handling Instructions list general precautions and suggestions on the use of electric power

tools, and specific precautions and suggestions on the use of rotary hammers to enhance the safe, efficient

use of the tool by customers. Salespersons must be thoroughly familiar with the Handling Instructions in

order to offer appropriate guidance to the customer during sales promotion activities.

B. Caution Plate

The Model DH 28PC unit is provided with a Caution Plate (illustrated below) that lists basic safety

precautions on use of the tool. Carefully ensure that the customer fully understands and follows these

precautions before using the tool.

[ For the USA and Canada ]

[ For China ]

[ For Mexico ]

PRECAUTIONS ON SALES PROMOTION

-13-

1. Grease replacement procedures

The hammering section and gear change section use different types of grease. Grease need not be

replenished unless the tool is disassembled for repair or grease is leaking due to a damaged seal.

A special grease is used for the hammering section. After disassembling the hammering section (inside the

cylinder case and crank case), carefully wipe old grease off the parts and fill the crank case (on the

connecting rod side) with 25 g of grease and the crank case (on the cylinder side) with 5 g. Be careful not to

overfill with an excessive amount of grease, which could cause hammering failure.

The gear change section (inside the gear cover) uses Hitachi Motor Grease No. 29. The proper amount of

grease is 15 g. Never use the special grease for the hammering section in the gear change section.

Otherwise, the special grease will leak into the motor section and cause subsequent trouble. Periodically

change the grease in the slip clutch. Fully fill the slip clutch with Cosmos Molybdenum Grease No. 2.

2. Structure of the Model DH 28PC Rotary Hammer

• Torque transmission

The rotational force of the bevel gear is transmitted to the cylinder through the clutch and rotates the

cylinder. The front side of the cylinder also serves as a drill bit holder. The drill bit inserted into the cylinder

is coupled with two key rails and one steel ball to transmit the rotation.

REFERENCE MATERIALS

rmature

Second gear

Bevel pinion

Bevel gear

ClutchCylinder

Key rail

Steel ball

-14-

Slide sleeve

Lock sleeve

Clutch

Bevel gear

Cylinder

Striker

Piston

Change lever

ir hole A

ir hole B

3. “Three-Mode” Changeover Mechanism

The user can select "Rotation + Hammering," "Rotation only," or "Hammering" mode by operating the mode

change lever of the product. Each of the three modes is explained below.

Operate the change lever while pressing the pushbutton switch.

• Rotation and hammering

Set the change lever to the "Rotation + hammering"( mark) position.

The claw of the bevel gear engages with the claw of the clutch. Rotational force is transmitted to the

cylinder coupled with the clutch and rotates the bit. At this time, cylinder air hole B is blocked by the slide

sleeve. When the bit is pressed against an object, the striker blocks cylinder air hole A to form an air

chamber between the piston and striker. Changes in air pressure inside the air chamber cause the striker to

move. Hammering force is thus transmitted to the second hammer and then to the bit tool.

• Hammering only

Set the change lever to the "Hammering only" ( mark) position.

The bevel gear disengages from the clutch to cut off the transmission of rotational force. The spline in the

inner periphery of the lock sleeve engages with the spline on the end surface of the clutch. This locks both

cylinder rotation and bit rotation at the same time.

At this time, cylinder air hole B is blocked by the slide sleeve. When the bit is pressed against an object, the

striker blocks cylinder air hole A to form an air chamber between the piston and striker. Changes in air

pressure inside the air chamber cause the striker to move. Hammering force is thus transmitted to the

second hammer and then to the bit tool.

Slide sleeve

Lock sleeve

Clutch

Bevel gear

Cylinder

Striker

Piston

Change lever

ir hole A

ir hole B

-15-

• Rotation only

Set the change lever to the "Rotation only" ( mark) position.

The claw of the bevel gear engages with the claw of the clutch. Rotational force is transmitted to the

cylinder coupled with the clutch and rotates the bit. The slide sleeve moves to the front end side as the lock

sleeve moves there. This keeps cylinder air hole B open. As a result, air pressure inside the air chamber

remains the same and hammering force is not transmitted.

• Neutral

This product has a Neutral mode to be used to determine the working position of a bit tool such as a cold

chisel.

Set the change lever to the "Neutral" ( mark) position.

The bevel gear disengages from the clutch and cuts off the transmission of rotational force. The lock sleeve

also disengages from the clutch so that the cylinder can rotate freely. In this state, the user can turn a bit

tool to the desired working position.

Slide sleeve

Lock sleeve

Clutch

Bevel gear

Cylinder

Striker

Piston

Change lever

ir hole A

ir hole B

Bevel gear

Slide sleeve

Lock sleeve

Clutch

Cylinder

Striker

Piston

Change lever

ir hole A

ir hole B

-16-

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

1. O-ring replacement

2. Striking operation

3. Mechanism to prevent idle hammering

4. Slip clutch mechanism

5. Sealing and dust-proof structure

6. Speed control

7. Handle and side handle

8. Caution when using “Rotation only” (No hammering) function

9. Drill bits

10. Tool retainer

11. Dust collector (B)

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

-17-

Be sure to disconnect the power cord plug from the wall outlet before conducting repair. Otherwise, the

motor may suddenly run, posing a very dangerous situation.

1. Precautions on Disassembly and Reassembly

The [Bold] numbers in the descriptions below correspond to item numbers in the parts list and exploded

view assembly diagram for the Model DH 28PC.

1. Disassembly of the tool retainer

Fully pull Grip [3] in the arrow direction and remove Front Cap [1]. Forcefully pull Front Cap [1] to remove it

from Cylinder [21].

Then remove Stopper Ring [29] by using the stopper ring puller while pulling Grip [3]. You can then remove

Grip [3], Ball Holder [4], Steel Ball D7.0 [20], Holder Plate [5], and Holder Spring [6] from Cylinder [21].

2. Disassembly of the hammering mechanism

(a) Cylinder Case and Cylinder

First, remove Seal Lock Hex. Socket Hd. Bolt M4 x 12 [57] from Change Lever [58], and then demount

Change Lever [58] and Lever Holder [59]. Remove Hex. Socket Hd. Bolt (W/Flange) M4 x 10 [43], Hex.

Socket Hd. Bolt (W/Flange) M5 x 16 [98], Tapping Screw (W/Flange) D5 X 20 (Black) [78], and Tapping

Screw (W/Flange) D4 X 25 (Black) [44]. Remove Handle (A). (B) Set [40] from Crank Case [104] and

Housing Ass'y [74].

Then remove Tapping Screw (W/Flange) D4 X 16 (Black) [82]. Remove Tail Cover [81] from Housing Ass'y

[74]. Remove Hex. Socket Hd. Bolt (W/Flange) M5 x 16 [98] from Crank Cover [99], and then demount

Crank Cover [99] and Rubber Seal [102] from Crank Case [104]. Remove Retaining Ring For D35 Hole

[60] by using stopper ring puller and demount Lever Shaft [61].

REPAIR GUIDE

Front Cap [1]

Grip [3]

Cylinder [21]

Stopper Ring [29]

Holder Spring [6]

Holder Plate [5]

Steel Ball D7.0 [20]

Ball Holder [4]

Disassembly

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Hitachi DH 28PC Technical Data And Service Manual

Brand: Hitachi

Model: DH 28PC

Category: Rotary hammers

Type: Technical Data And Service Manual

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Hitachi DH 28PC Technical Data And Service Manual

Hitachi DH 28PC Technical Data And Service Manual

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