Hitachi G 10SF3 Manual

POWER TOOLS

TECHNICAL DATA

AND

SERVICE MANUAL

DISC GRINDER

G 10SF3

SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT

LIST No. E243 Aug. 2001

MODEL

G 10SF3

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 9523NB

Page

CONTENTS

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

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

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

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

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

6. COMPARISONS WITH SIMILAR PRODUCTS ..............................................................................4

6-1. Specification Comparisons ............................................................................................................ 4

6-2. Comparisons in Torque vs. Rotation Speed and Stator Coil Temperature Rise ............................ 5

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

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

7-2. Caution Plate (For China only) ...................................................................................................... 6

7-3. Precautions on Usage ................................................................................................................... 6

8. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY ............................................................7

8-1. Disassembly .................................................................................................................................. 7

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

8-3. Lubrication Points and Types of Lubricant .................................................................................... 11

8-4. Tightening Torque ......................................................................................................................... 11

8-5. Wiring Diagram ............................................................................................................................. 11

8-6. Insulation Tests ............................................................................................................................ 12

8-7. No-load Current Value ................................................................................................................. 12

9. STANDARD REPAIR TIME (UNIT) SCHEDULES .......................................................................13

Assembly Diagram for G 10SF3

--- 1 ---

1. PRODUCT NAME

Hitachi Disc Grinder, Model G 10SF3 [100 mm (4")]

2. MARKETING OBJECTIVE

The current Model G 10SF2 has been favorably accepted in the compact disc grinder market in China. However,

recent Chinese market is fiercely competitive due to a price war. To address the severe situation, we have

developed a new disc grinder Model G 10SF3 that is comprised of parts manufactured in China. The Model

G 10SF3 is more powerful than the current Model G 10SF2 thanks to the improved cooling efficiency of the motor.

The components of the Model G 10SF3 are the same as those of the Model G 10SF2 except the enclosure and

the wiring components.

3. APPLICATIONS

Removal of casting fin and finishing of various types of steel, bronze, aluminum, and other metallic materials

and castings

Grinding of welded sections, or sections cut by acetylene torch

Grinding of slate, brick, marble and similar materials

4. SELLING POINTS

High power input: 560 W

(G 10SF2 and C: 540 W)

New vaned dust seal efficiently

prevents dust from entering the ball

bearing on the commutator side.

Easy-to-use snap switch

Excellent wear resistance of armature coil:

2 times higher than the Model G 10SF2

1.7 times higher than C

--- 2 ---

Excellent wear resistance of armature coil

Wear resistance of the armature coil is greatly increased thanks to the smaller air vent to minimize sucking

dust and fine gravel into the machine.

G 10SF3

(Comparison of wear resistance of armature coils when dust and fine gravel are sucked into the machines)

(Comparison of air vents near the commutator)

Smaller air vent is

provided near the

commutator. Two air vents are provided

near the commutator.

G 10SF2

100

G10SF3

G10SF2

10 13.5

--- 3 ---

Depressed

center

wheel

5. SPECIFICATIONS

4,300 m/min (14,100 ft/min, 72 m/s)

Dimensions

Model

Item

O.D. 100 mm (4") x Thickness 4 mm (5/32")

x I.D. 16 mm (5/8")

Offset amount: 4 mm (5/32")

Max. peripheral speed

G 10SF3

AC single phase 50 or 60 Hz

Power source

Snap switch

1.4 kg (3.09 lbs.)

2.4 kg (5.3 lbs.)

Corrugated cardboard box

No-load speed

Type of motor

Enclosure

Type of switch

Weight Net: *1

Gross:

Packaging

Standard accessories*2Depressed center wheel [Outer dia.100 mm (4") ] .................1

Wrench ...................................................................................1

Voltage, current and power input

12,000/min

AC single phase commutator motor

Housing tail cover

Gear cover

Inner cover packing gland

Glassfiber reinforced polycarbonate resin (Green)

Aluminum alloy die casting (Metallic silver)

Aluminum alloy die casting

Voltage (V)

Current (A)

Power input (W)

220

560

2.7

*1: Net weight excludes cord, depressed center wheel, wheel nut, wheel washer and wheel guard.

*2: Standard accessories are subject to change without prior notice.

--- 4 ---

HITACHI

G 10SF3

100

12,000

560

380

640

254

200

1.4

(1.5)

Snap

Maker

Model

Wheel diameter mm

No-load speed /min

Power input W

Power output W

Max. power output W

L mm

Dimensions W mm

H mm

P mm

Weight * kg

(Actual weight)

Type of switch

6. COMPARISONS WITH SIMILAR PRODUCTS

6-1. Specification Comparisons

G 10SF2

100

12,000

540

330

610

254

200

1.4

(1.5)

Snap

100

11,000

540

290

620

256

195

1.4

(1.5)

Slide

P: Perimeter

* Weight excludes cord, depressed center wheel, wheel nut, wheel washer and wheel guard.

--- 5 ---

6-2. Comparisons in Torque vs. Rotation Speed and Stator Coil Temperature Rise

Figure 1 shows comparisons of the rotation speed and the stator coil temperature rise between a competitive

model with respect to torque. Torque represents the magnitude of load, i.e., the amount of pressing force, cutting

depth and forward force in actual cutting jobs. This shows that a powerful motor is less likely to burn out because

it has both a minimum drop of rotation speed even at a greater torque and a lower stator coil temperature rise at

the same torque.

Fig. 1 Comparisons in torque vs. rotation speed and stator coil temperature rise

Figure 1 indicates the followings:

The motor speed of the Model G 10SF3 is higher than that of C at the same torque. This means that the

working efficiency of the Model G 10SF3 is superior to C (Model G 10SF2 is also superior to C).

The stator coil temperature rise of the Model G 10SF3 is lower than the Model G 10SF2 thanks to the

improved cooling mechanism and it is equivalent to that of C. This means that the Model G 10SF3 has a burn-

resistant and tenacious motor.

Load

Stator coil temp. rise (K)

2,000

4,000

6,000

8,000

12,000

10,000

600

100

200

300

400

500

Rotation speed of spindle (/min.)

Torque range

HITACHI G 10SF3

Stator coil temp. rise

X: Burn-out point

HITACHI G10SF2

HITACHI G 10SF2, G 10SF3

Rotation speed of spindle

--- 6 ---

7. PRECAUTIONS IN SALES PROMOTION

In the interest of promoting the safest and most efficient use of the Model G 10SF3 Disc Grinder 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

any 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 disc grinders 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 (For China only)

The following caution is listed on the Name Plate attached to the main body of each tool.

7-3. Precautions on Usage

Instruct the customer to pay particular attention to the two points described below.

(1) Use of the side handle (Optional accessory)

When the side handle is used, the customer must be instructed to ensure without fail that the wheel guard is

mounted in the manner so that it protects the operator's hand from coming into contact with the depressed

center wheel.

Fig.2

Side handle

Pushing button

Wheel guard

(2) Never press the pushing button while the depressed center wheel is rotating.

If the pushing button (Fig. 2) is pressed while the depressed center wheel is rotating, the spindle will stop

immediately. In such a case, there is a danger that the wheel nut may be loosened, so that the depressed

center wheel flies out unexpectedly and may cause possibly serious injury.

--- 7 ---

8. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY

Procedures and precautions for disassembly and reassembly are described below. The [Bold] numbers in the

descriptions below correspond to the item numbers in the Parts List and the exploded assembly diagram.

8-1. Disassembly

(1) Disassembly of the armature

Remove the Brush Caps [39], and take out the Carbon Brushes [40].

Loosen the four Tapping Screws D5 x 25 [1] which fix the Gear Cover Ass'y [3], and remove the Inner

Cover [8] together with the Armature 220 V [9] from the Housing [34].

(2) Disassembly of the pinion

Loosen the Special Nut M7 [4] on the Armature 220 V [9], and remove the Pinion [5].

(3) Disassembly of the stator

Remove the Armature 220 V [9] and loosen the Tapping Screw (W/Flange) D4 x 25 (Black) [48] to remove

Tail Cover (B) [47].

Loosen the Machine Screw (W/Washer) M3.5 x 6 [49] that secures the internal wire of the Cord [51] to the

Switch [50] and also the screw on the cord side of the Pillar Terminal [43]. Remove the two internal wires

from the Cord [51].

Remove the Tapping Screw (W/Flange) D4 x 40 [38] and the Tapping Screw (W/Flange) D4 x 20 (Black)

[37]. Remove Tail Cover (A) [36] then remove the Earth Terminal [44] from the Housing [34].

Disconnect the two Internal Wires [13] coming from the Brush Holder [41] from the Stator [11].

Remove the Internal Wires [12] and [14] from the Stator [11] with the Pillar Terminal [43], Noise Suppressor

[46] and Switch [50] connected.

Loosen the Hex. Hd. Tapping Screw D4 x 65 [10] securing the Stator [11]. Remove the Stator [11] from the

Housing [34].

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