Hitachi CM 4SB2 Manual

TECHNICAL DATA

AND

SERVICE MANUAL

110 MM CUTTER

CM 4SB2

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

LIST No. E710 Feb. 2006

MODEL

CM 4SB2

Hitachi



Power Tools

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

MAKITA 4100NH

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 ........................................................................................................................... 4

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

6. COMPARISONS WITH SIMILAR PRODUCTS ............................................................................... 5

6-1. Specification Comparisons ...............................................................................................................5

6-2. Cutting Characteristics for Various Workpiece Materials .................................................................. 6

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

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

7-2. Cautions on the Name Plate .............................................................................................................8

7-3. Precautions in Use ............................................................................................................................9

8. DISASSEMBLY/REASSEMBLY GUIDE ....................................................................................... 10

8-1. Disassembly ...................................................................................................................................10

8-2. Reassembly ....................................................................................................................................14

8-3. Inspection after Reassembly ..........................................................................................................16

9. STANDARD REPAIR TIME (UNIT) SCHEDULES ........................................................................ 17

Assembly Diagram for Model CM 4SB2

--- 1 ---

1. PRODUCT NAME

Hitachi Cutter, Model CM 4SB2

2. MARKETING OBJECTIVE

The sales of the current Model CM 4SB have been slowing down in the huge Chinese market due to the price war

and spread of made-in-China products and fake brand name products. The new Model CM 4SB2 is the upgraded

version of the current Model CM 4SB and the Model CM 4SA2 that has been mainly sold in Taiwan. The new

Model CM 4SB2 has many selling points such as the powerful motor with the class-top maximum power input,

highly vibration-resistant armature, toolless base adjustment mechanism, and ball bearing covered with metal

bushing. In addition, the Model CM 4SB2 is novel and easy to operate thanks to the soft-grip handle and the

compact body to differentiate from other products at a glance. With the new Model CM 4SB2, we aim to expand

our market share.

3. APPLICATIONS

Cutting or striating stones such as marble and granite, tile, concrete, brick, and similar materials

<< Typical applications >>

Upholstery work, decoration work, stone processing, tiling, electric work, and plumbing

High overload durability thanks to the powerful

1,320 W motor with the class-top maximum

power input

The ball bearing at the

commutator side is covered with

the metal bearing bushing.

4. SELLING POINTS

Compact and lightweight

Longer-life motor thanks to the highly vibration-

resistant and dust-resistant armature coil

It is convenient for edge

cutting thanks to the short

distance (L) between the

blade tip and the base edge.

Easy to use toolless base

adjustment mechanism for

secure fixation of the base

Soft-grip handle for

comfortable grip and fit

Rubber covered

dust-resistant switch

--- 2 ---

Model

CM 4SA2

1.23 N

250

200

150

100

0.4 2.4

2.0

1.6

1.20.8 2.8

1.41 N

Model

CM 4SB

1.45 N

Model

CM 4SB2

1.98 N

Torque-temperature curve

Spindle-torque (N

Stator coil temperature ( C)

300

Torque (N•m)

Torque ratio

CM 4SB2 CM 4SA2

1.98

1.37

1.45

1.0 0.97

4-1. Selling Point Descriptions

(1) Powerful 1,320 W motor with the class-top maximum power input

The Model CM 4SB2 has high overload durability thanks to the most powerful motor in the class.

Following table shows a comparison of the spindle torque ratio with the conventional models and a competitor

when the stator coil temperature is 200 ûC. It is clear that high overload durability can be obtained as the

torque becomes high.

CM 4SB C

0.85

1.41 1.23

(2) Highly vibration-resistant and dust-resistant armature coil

The Model CM 4SB2 has substantially higher vibration resistance than the conventional model because

movement of the coil due to vibration is suppressed by coating the periphery of the joint between the armature

coil and the commutator with a special glue. It also prevents dust and debris of concrete or stone from getting

in and scratching the coil surface.

Metal bearing bushing

Sealed armature coil (Glue coated):

Improved resistance to vibration

Protecting from dust and debris

Resin tail cover

--- 3 ---

(3) The ball bearing at the commutator side is covered with the metal bearing bushing

The resin housing incorporates the metal bearing bushing and the outer frame is covered with the resin tail

cover to cope with weakness of the resin housing that it melts by heat of the ball bearing due to overload

operation. This resin tail cover also prevents the CB cap from being loose by vibration.

(4) Soft-grip handle for comfortable grip and fit

The handle grip is entirely covered with a soft resin material (called "elastomer") for nonskid grip and

comfortable fit. This handle offers less user fatigue even if it is operated for a long time.

(5) Easy to use toolless base adjustment mechanism for secure fixation of the base

The Model CM 4SB2 has the base adjustment mechanism equipped with a lever to adjust the cutting depth

without the aid of tools. In the case of the conventional models and the competitors, a wing bolt is used to fix

the base link. However, there is a problem that such a wing bolt is apt to be loose during operation and lost

without being noticed. In the case of the Model CM 4SB2, the base can be easily fixed and loosened just by

raising and lowering the lever. In addition, the lever is prevented from being loose during operation.

(6) Short distance (L) between the blade tip and the base edge

The Model CM 4SB2 has the uniquely shaped

base unit to shorten the dimension (L) as shown

in the left figure. It is convenient for edge cutting.

The dimension (L) of the Model CM 4SB2 is

28 mm as shown in the table above. It is the

shortest among the current models and C by

10 mm or more.

CM 4SB2

Comparison of the dimension (L)

CM 4SB

CM 4SA2

Back side

Metal bearing bushing

CB cap Resin tail cover

--- 4 ---

Housing Polycarbonate resin + elastomer

Handle cover Polycarbonate resin + elastomer

Tail cover Polyamide resin

Gear cover Aluminum die casting

5. SPECIFICATIONS

5-1. Specifications

Max. cutting depth

34 mm (for 110 mm diamond wheel)

31.5 mm (for 105 mm diamond wheel)

Max. diameter

110 mm external dia. x 1 mm thickness x 20 mm internal dia.

Diamond wheel size

Capacity

Full-load current and

power input

Voltage

110 V

120 V

220 V

230 V

Full-load current

AC single phase commutator motor

Type of motor

AC single phase

Power source

Trigger switch

Type of switch

Enclosure

(Material and color)

12.6 A

11.6 A

6.3 A

6.0 A

240 V 5.8 A

11,500/min.No-load rotation speed

2.8 kg (6.2 lbs.) (excluding cord)

Net

3.8 kg (8.4 lbs.)

Gross

Two core cabtire cable

Type

2.5 m (8.2 ft.)

Overall length

Corrugated fiberboard box

Package

Box wrench ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1

Wrench ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1

Water plug (excluding China, U.S.A.) ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1

Rubber adaptor (exclusing China, U.S.A.) •••••••••••••••••••••••••••••••••••••••••••••••••••• 1

Vinyl hose (exclusing China, U.S.A.) •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1

Standard accessories

Weight

Cord

Diamond wheel

•Segment type (for dry cutting) Diameter 106 mm (4-1/8")

•Rim type (for wet cutting) Diameter 110 mm (4-3/8")

•Rim type (for dry and wet cutting) Diameter 104 mm (4")

Optional accessories

Power input

1,320 W

204 mm x 157 mm (8-1/32" x 6-3/16")Overall length x height

CM 4SB2

Item Model

--- 5 ---

6. COMPARISONS WITH SIMILAR PRODUCTS

6-1. Specification Comparisons

Maker • Model HITACHI

Item • Unit CM 4SB2

Diamond wheel dia. 110 (4-3/8")

mmMax. cutting depth 34 (1-3/8")

/minNo-load speed 11,500

Power input 1,320

Weight

(excludes cord) 2.8 (6.2 lbs)

VVoltage 220

/minSpeed 11,700

Noise level 85

Current 6.3

/minSpeed 7,900

N•m

Torque 0.90 (1.22 ft-lbs)

Output 740

No-load

St. coil 51

Ar. coil 63

Full-load

Temperature

rise

Overload durability

16.5 (22.4 ft-lbs)

Max. output 2,090

Weight (excludes cord) 2.94 (6.5 lbs)

Overall length 204 (8-1/32")

Height 156 (6-9/64")

Cord length

Provided

Distance between base

edge and blade

Provided

Large lever

Soft grip handle

Catalog specifications

Characteristics

Features

Vibration level db 103 (1.4 m/s2)

Max. torque

N•m

ratio

1.95

136

Metal bearing holder

Sealed armature coil

Cutting depth setting

2.5 (8.2 ft)

28 (1-7/64")

CM 4SB

110 (4-3/8")

34 (1-3/8")

12,000

1,240

2.8 (6.2 lbs)

220

12,000

5.9

8,500

0.80 (1.08 ft-lbs)

705

13.1 (17.8 ft-lbs)

2,040

2.99 (6.6 lbs)

201 (7-29/32")

156 (6-9/64")

Not provided

Wing bolt

111 (3.6 m/s2)

1.43

100

2.5 (8.2 ft)

38 (1-1/2")

CM 4SA2

110 (4-3/8")

34 (1-3/8")

11,000

1,050

2.6 (5.7 lbs)

220

11,500

5.0

7,300

0.81 (1.10 ft-lbs)

620

9.8 (13.3 ft-lbs)

1,310

2.67 (5.9 lbs)

195 (7-43/64")

156 (6-9/64")

Not provided

Wing bolt

111 (3.6 m/s2)

1.33

2.5 (8.2 ft)

38 (1-1/2")

110 (4-3/8")

34 (1-3/8")

13,000

1,200

2.9 (6.4 lbs)

220

12,500

5.7

8,500

0.83 (1.19 ft-lbs)

740

8.8 (11.9 ft-lbs)

1,630

2.94 (6.5 lbs)

206 (8-7/64")

164 (6-29/64")

Not provided

Wing bolt

106 (2.0 m/s2)

1.43

100

2.5 (8.2 ft)

42 (1-21/32")

N•m

--- 6 ---

6-2. Cutting Characteristics for Various Workpiece Materials

The relationships between cutting speed and load current for various workpiece materials are shown in the graphs

below. At the same cutting speeds, the load currents of the Model CM 4SB2 are lower than those of the Model

CM 4SB and maker C's model.

Power supply: 220 V 50 Hz

Diamond wheel: Segment type, 106 dia.

Rim type, 110 dia.

(1) For wet cutting

Model CM 4SB

0.0 1.00.8

0.6

0.4

0.2 1.2

Model

CM 4SB2

0.0 1.00.8

0.6

0.4

0.2 1.2

Model

CM 4SB

Model

CM 4SB2

Cutting speed (m/min.)

Marble T25 (Wet)

Current (A)

Cutting speed (m/min.)

Concrete, depth 34 mm (Wet)

Current (A)

--- 7 ---

(2) For dry cutting

7. PRECAUTIONS IN SALES PROMOTION

In the interest of promoting the safest and most efficient use of the Model CM 4SB2 Cutter 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 Name 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 cutter are listed in the Handling Instructions to enhance the safe and 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.

Model

CM 4SB

0.0 1.50.4

0.3

0.2

0.1

Model

CM 4SB2

0.0 1.00.8

0.6

0.4

0.2

Model

CM 4SB2

Cutting speed (m/min.)

Marble T25 (Dry)

Current (A)

Cutting speed (m/min.)

Concrete, depth 34 mm (Dry)

Current (A)

Model

CM 4SB

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