Hitachi C 7SB2C, C 7BD2 Technical Data And Service Manual

TECHNICAL DATA

AND

SERVICE MANUAL

CIRCULAR SAWS

C 7SB2/C 7BD2

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

LIST Nos. C 7SB2: 0591

C 7BD2: 0592

Revised Aug. 2005

C

MODELS

C 7SB2
C 7BD2

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

DEWALT

DW368

DW369CS

P

MAKITA

5007NH

5007NBA

C

Page

CONTENTS

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

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

3. APPLICA TIONS............................................................................................................................... 1

4. SELLING POINTS ........................................................................................................................... 1

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

5. SPECIFICATIONS ........................................................................................................................... 3

6. COMPARISONS WITH SIMILAR PRODUCT ................................................................................. 4

6-1. Specification Comparison ................................................................................................................ 4

6-2. Practical Test Data ............................................................................................................................5

7. PRECAUTIONS IN SALES PROMOTION ...................................................................................... 6

7-1. Handling Instructions ........................................................................................................................6

7-2. Caution Plate ....................................................................................................................................6

7-3. Do Not Use Cut-Off Wheels..............................................................................................................7

8. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY ............................................................. 8

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

8-2. Reassembly ......................................................................................................................................9

9. STANDARD REPAIR TIME (UNIT) SCHEDULES ........................................................................ 15

Assembly Diagram for C 7SB2
Assembly Diagram for C 7BD2

--- 1 ---

1. PRODUCT NAME

Hitachi 7-1/4" Circular Saws, Models C 7SB2 and C 7BD2

2. MARKETING OBJECTIVE

The current mainstream of professional-use circular saws is the 7-1/4 " (185 mm) class in the North America
market. Although we have been selling the Models C 7SB and C 7BD (with brake) of this class, over 10 years
have passed since the sales start in 1989. In addition, recently redesigned C, P and E are more competitive than
the Models C 7SB and C 7BD. To cope with this situation, the new Models C 7SB2 and C 7BD2 are developed
corresponding to the following market demands for convenience of operation.
(1) High-power input: 1710 W (only GBR (110 V): 1670 W)
(2) 24-tooth carbide-tipped saw blade (for USA. 18-tooth carbide-tipped saw blade for AUS, NZL and Europe)
(3) AC/DC switch
(4) Bevel adjustment lever
(5) Base with scale
(6) 55˚ bevel capacity (for U.S.A., AUS and NZL. Europe: 45˚)
(7) Soft grip handle

3. APPLICA TIONS

Cutting of various types of wood materials

4. SELLING POINTS

Lightweight: 10.1 lbs. (4.6 kg)
(C 7SB: 10.6 lbs. (4.8 kg))

Soft and comfortable grip

Easy access bevel
adjustment with lever

Heavy duty aluminum
base with scale

Easy access cutting
depth adjustment

24-tooth carbide-tipped
saw blade (for USA)

Magnesium gear cover,
blade cover and
lower guard

Electric brake for rapid
stopping of saw blade
(Model C 7BD2 only)

AC/DC SW

55˚ bevel capacity
(for USA, AUS and
NZL)

High-power input motor: 1710 W
(GBR (110 V): 1670 W)

--- 2 ---

4-1. Selling Point Descriptions

(1) Lightweight, 10.1 lbs. (4.6 kg)

The motor is enlarged to increase the input and output power. The gear cover, blade cover and lower guard
are made of magnesium diecasting alloy to minimize increase of the product weight. The table below shows a
weight comparison with C (catalog weight 10.1 lbs., measured weight 10.6 lbs.).

(2) AC/DC switch (110 V and 120 V only)

The same AC/DC switch as the one used in the conventional Models C 7SB and C 7BD is adopted to
correspond to the customer demand. The Models C 7SB2 and C 7BD2 are operable on a DC power supply
such as a generator on a building site.

(3) 24-tooth carbide tipped saw blade (for USA)

The Models C 7SB2 for USA and C 7BD2 are equipped with the 24-tooth carbide tipped saw blade that is the
current mainstream of standard saw blade. Green urethane painting is applied on the surface to distinguish
the Hitachi saw blade from others at a glance.

(4) Soft and comfortable grip

The non-slip, soft and comfortable grip is adopted to improve the operability.

(5) High-power input motor: 1710 W (GBR (110 V): 1670 W)

The Models C 7SB2 and C 7BD2 are equipped with the high-power motor to increase the cutting ability.

(6) Easy access bevel adjustment with lever

The conventional wing bolt type bevel adjustment system is changed to the lever type for convenient bevel
adjustment.

(7) 55˚ bevel capacity (for USA, AUS and NZL)

The bevel angle between the saw blade and the base is adjustable from 0˚ to 55˚ for wider application range
(conventional Models C 7SB and C 7BD: 0˚ to 45˚). For ease of operation, the adjustment section is divided
into two ranges; one is adjustable from 0˚ to 45˚ for comparatively frequent use and the other is adjustable
from 45˚ to 55˚ for less frequent use.

(8) Heavy-duty aluminum base with scale

The Models C 7SB2 and C 7BD2 are equipped with the heavy-duty aluminum die-cast base that is the same
as the Models C 7SB and C 7BD. In addition, this base has scales at the front and the side for ease of
operation.

(9) Easy access cutting depth adjustment

The position of the cutting depth adjustment lever is shifted from the gear cover side to the outside of the
handle for easier cutting depth adjustment.

Catalog weight

Measured weight

Maker

Model

Hitachi

C 7SB2

lbs. (kg)

lbs. (kg)

Hitachi C

C 7BD2

C 7SB

C 7BD

10.1 (4.6)

10.6 (4.8) 10.6 (4.8)

10.6 (4.8)

10.1 (4.6)

10.6 (4.8)

11.0 (5.0)

11.0 (5.0)

5007NH

5007NBA

Weight excludes cord.

--- 3 ---

Standard accessories

Tungsten carbide tipped saw blade

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

1

Box wrench

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

1

Guide (for AUS, NZL and Europe)

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

1

Mold case

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

1

Guide

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

1

Type of motor

Enclosure

Weight

1-11/16" (43 mm)

Housing Polycarbonate resin
Handle cover Polycarbonate resin
Grip cover Polycarbonate resin, elastomer
Gear cover Die-cast magnesium alloy
Blade cover Die-cast magnesium alloy
Lower guard Die-cast magnesium alloy
Base Die-cast aluminum alloy

1-27/32" (47 mm)

Max.
cutting
depth

AC single-phase 50/60 Hz (120 V AC/DC)

at 90˚

Trigger switch

Power source

Type of switch

Power input

at 45˚

AC single phase commutator motor

Voltage [V]
Current [A]

Rotation speed

Cord

No-load

Gross

Net

Full-load

Type
Overall length

5,800/min.

1710 W, 1670 W (for GBR (110 V))

3,760/min.

Main body (excludes cord)

••••••••••••••••••••••••••••

10.1 lbs. (4.6 kg)

Main body, mold case, others

••••••••••••••••••••••••

16.3 lbs. (7.4 kg)

8.2 ft. (2.5 m)

5. SPECIFICATIONS

7-1/4" (185 mm)

Two-core cabtire cable

Model

Saw blade diameter

C 7SB2

2-3/8" (60 mm)

C 7BD2

at 50˚ (for USA, AUS and NZL)
at 55˚ (for USA, AUS and NZL)

1-17/32" (39 mm)

NoneElectric brake Equipped

Packing

Mold case

Optional accessories

Item

110

16

120

15

230

7.8

240

7.5

--- 4 ---

6. COMPARISONS WITH SIMILAR PRODUCT

6-1. Specification Comparison

Rated voltage

No-load speed

Material of base

Item • Unit

2-3/8

(60)

Cutting
depth

90˚

Saw blade dia.

Rated current

No-load noise

45˚

Full-load torque
Max. output

Power source
Electric brake

Base
scale

C 7SB2

Maker • Model

in.

(mm)

V
A

Weight
(exclude cord)

No-load speed
Full-load speed

/min.

lbs.

(kg)

ft-lbs.
(N

•m)

Soft grip

HITACHI

C

Catalog specifications

Structure

Characteristic

in.

(mm)

50˚

in.

(mm)

55˚

in.

(mm)

in.

(mm)

C 7SB

C

C 7BD2

HITACHI

C 7BD

P

P

2-3/8

(60)

2-3/8

(60)

2-3/8

(60)

2-3/8

(60)

2-3/8

(60)

*1

*1 *1

*1

*1

*1

*1

*1

1-27/32

(47)

1-27/32

(47)

1-27/32

(47)

1-3/4

(44)

1-3/4

(46)

1-27/32

(47)

1-11/16

(43)

1-11/16

(43)

1-19/32

(40)

1-17/32

(39)

1-17/32

(39)

7-1/4
(185)

7-1/4
(184)

7-1/4
(185)

7-1/4
(185)

7-1/4
(185)

7-1/4
(185)

7-1/4
(184)

7-1/4
(185)

120 120115115 120120120 115

15

15 15 15

13 131315

5,800 5,5005,800 5,800 5,800 5,800 5,8005,500

10.1
(4.6)

10.1

(4.6)

10.6
(4.8)

10.1

(4.6)

9.5

(4.3)

10.6

(4.8)

11.0

(5.0)

9.8

(4.4)

Cord length

ft

(m)

8.2

(2.5)

8.2

(2.5)

8.2

(2.5)

8.2

(2.5)

8.7

(2.65)

9.0

(2.75)

9.5

(2.9)

9.0

(2.75)

/min.
/min.

dB

5,490 5,380 5,680 5,400 5,380 5,5605,490 5,400
3,760 4,050 4,050 3,760 3,760 4,050 4,040 3,760

1.72

(2.33)

1.72

(2.33)

1.23

(1.67)

1.60

(2.17)

1.73

(2.34)

1.23

(1.67)

1.73

(2.34)

1.25

(1.70)

W

2,100 1,680 2,060 2,100 1,680 1,880 2,0602,150

92

92.5 88 9290 90 8890

AC/DC

AC/DC AC/DC AC/DC AC AC AC/DCAC

None

EquippedEquippedEquippedNone None None Equipped

Aluminum

diecast

Composit

Aluminum

plate

Aluminum

diecast

Aluminum

diecast

Aluminum

plate

Magnesium

diecast

Aluminum

diecast

Front
Side

Equipped

Equipped

Equipped

None

None

None

Equipped

Equipped

None

Equipped

None

None

Equipped

Equipped

Equipped

None

None

None

Equipped

Equipped

None

Equipped

None

None

Bevel adjustment
Bevel capacity

Lever Lever Wing bolt Lever Wing bolt Wing bolt LeverWing bolt

55˚

45˚55˚ 45˚56˚50˚

56˚

45˚

L: 305
H: 255

W: 245

L: 300
H: 260

W: 240

L: 300

H: 242

W: 238

L: 305

H: 255

W: 235

L: 300

H: 260

W: 240

L: 305
H: 255

W: 245

L: 300

H: 242

W: 238

L: 300
H: 255

W: 235

Service life of the
carbon brush

150 150

hr

Unit: mm

5007NH DW368

5007NBA DW369CS

*: These numeric values are for the models destined for the USA.
Refer to "5. SPECIFICATIONS" as the capacities are different depending on the destinations.

W

L

H

--- 5 ---

6-2. Practical Test Data

The graph below shows a comparison of practical cutting data among the Model C 7SB2 (for USA), C and P.
(Note that the practical cutting data may vary depending on the conditions of the saw blade, workpiece material,
etc.)

Hemlock spruce (thickness 60 mm), vertical cutting

This graph shows the relation between the cutting speed and the load current. If the load current is low, the load
applied to the motor is also low, and generally the cutting capacity is more excellent when comparing the cutting
capacity at the same speed. Although the Model C 7SB2, C and P have almost the equivalent cutting capacity,
the Model C 7SB2 has the most excellent cutting capacity as shown in the above graph.

Cutting speed (m/min.)

Load current (A)

P:

C:

HITACHI
C 7SB2/C 7BD2 (for

USA)

--- 6 ---

7. PRECAUTIONS IN SALES PROMOTION

In the interest of promoting the safest and most efficient use of the Models C 7SB2 and C 7BD2 Circular Saws by
all of our customers, it is very important that at the time of sale the salesman carefully ensures that the buyer
seriously recognizes the importance of the contents of the Instruction Manual, 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 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 Circular Saw are listed in the Instruction Manual 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 following basic safety precautions are listed on the Name Plate attached to the main body of each tool.

For the U.S.A.

For AUS/NZL