Hitachi G 10SR2, G 12SR2, G 13SR2 Service Manual
DISC GRINDER
MODELS
G 10SR2
G 12SR2
G 13SR2
POWER TOOLS
G 10SR2
G 12SR2
G 13SR2
TECHNICAL DATA
AND
SERVICE MANUAL
G
LIST Nos. G 10SR2: E260
G 12SR2: E261
G 13SR2: E262
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
Feb. 2003
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:
G 10SR2
Competitor
Symbols Utilized
Company Name
Model Name
G 12SR2
Symbols Utilized
G 13SR2
Symbols Utilized
C
B
C
B
MAKITA
BOSCH
Company Name
MAKITA
BOSCH
Company Name
9523NB
GWS6-100
Competitor
Model Name
9524NB
GWS6-115
Competitor
Model Name
C
MAKITA
9525NB
CONTENTS
1. PRODUCT NAME...........................................................................................................................1
2. MARKETING OBJECTIVE .............................................................................................................1
3. APPLICA TIONS..............................................................................................................................1
4. SELLING POINTS ..........................................................................................................................1
5. SPECIFICATIONS ..........................................................................................................................2
6. COMPARISONS WITH SIMILAR PRODUCTS ..............................................................................4
6-1. Specification Comparisons ............................................................................................................ 4
6-2. Practical Test Data ......................................................................................................................... 5
7. PRECAUTIONS IN SALES PROMOTION .....................................................................................6
7-1. Handling Instructions ..................................................................................................................... 6
7-2. Caution on Name Plate.................................................................................................................. 6
Page
7-3. Precautions on Usage ................................................................................................................... 7
8. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY ............................................................8
8-1. Disassembly .................................................................................................................................. 8
8-2. Reassembly ................................................................................................................................... 9
8-3. Lubrication Points and Types of Lubricant................................................................................... 10
8-4. Tightening Torque .........................................................................................................................11
8-5. Wiring Diagrams ...........................................................................................................................11
8-6. Insulation Tests ............................................................................................................................ 12
8-7. No-Load Current Value ................................................................................................................ 12
9. STANDARD REPAIR TIME (UNIT) SCHEDULES .......................................................................13
Assembly Diagram for G 10SR2
Assembly Diagram for G 12SR2
Assembly Diagram for G 13SR2
1. PRODUCT NAME
Hitachi Disc Grinders, Models G 10SR2 [100 mm (4")]
G 12SR2 [115 mm (4-1/2")]
G 13SR2 [125 mm (5")]
2. MARKETING OBJECTIVE
The Models G 10SR2, G 12SR2, and G 13SR2 are upgraded versions of the previous low-price G 10SR series,
developed under the concept for more powerful, convenient and competitively priced models to expand our
market share and sales. The key features of the Models G 10SR2, G 12SR2, and G 13SR2 in comparison with
the previous models are as follows:
1) Increased input and maximum output
2) Increased overload durability
3) Compact and lightweight, and easy-to-use slide switch
4) Low operating noise
5) Prolonged service life of the carbon brushes
3. APPLICA TIONS
Removal of casting fin and finishing of various types of steel, bronze, aluminum and various other metallic
•
materials
Grinding of welds, or sections cut by means of a cutting torch
•
Grinding of synthetic resins, slate, brick, marble, etc.
•
4. SELLING POINTS
Compact body: 254 mm (10")
Maker B's model: 256 (10-1/8")
Maker C's model: 263 (10-5/16")
254 mm (10")
Easy-to-use slide switch
Excellent overload durability:
1.20 times higher compared to maker B's model
1.02 times higher compared to maker C's model
High-power motor
(with maximum output of 1,010 W)
Maker B's model: 700 W
Maker C's model: 750 W
--- 1 ---
5. SPECIFICATIONS
Item
Depressed
Dimensions
center
wheel
Max. practical
peripheral speed
Voltage, current and
power input
Type of motor
Model
G 10SR2
O.D. 100 mm (4")
x Thickness 4 mm (5/32")
x I.D. 16 mm (5/8")
O.D. 115 mm (4-1/2")
x Thickness 6 mm (1/4")
x I.D. 22 mm (7/8")
4,300 m/min.
(14,100 ft/min, 72 m/s)
AC single phase 50 or 60 HzPower source
Voltage (V)
Current (A)
110
120
220 3.0
230 2.9
240 2.8
11,000 /min.No-load speed
AC single phase commutator motor
G 12SR2 G 13SR2
O.D. 125 mm (5")
x Thickness 6 mm (1/4")
x I.D. 22 mm (7/8")
4,800 m/min.
(15,756 ft/min, 80 m/s)
Power input (W)
6.1
5.0
650
580
650
10,000 /min.
Slide switchType of switch
Enclosure
1
Material: Housing
Tail cover
Gear cover, inner cover, packing gland
•••••
Glassfiber reinforced polyamide resin (green)
•••••
aluminum alloy die casting
1.4 kg (3.1 lbs.)Net *
Weight
2.2 kg (4.9 lbs.)Gross
2.4 kg (5.3 lbs.) 2.5 kg (5.5 lbs.)
Corrugated cardboard boxPackaging
Depressed center wheel
Standard accessories *
*1) Net weight excludes cord, side handle, depressed center wheel, wheel nut, wheel washer and wheel guard.
*2) Standard accessories may vary depending on market area.
2
100 mm (4")
Side handle
Wrench
••••••••••••••••
•••••••••••••••••
•••••••••••••••••••••••
Depressed center wheel
1
115 mm (4-1/2")
1
Side handle
1
Wrench
•••••••••••••••••
•••••••••••••••••••••••
•••••••••••
Depressed center wheel
125 mm (5")
1
Side handle
1
1
Wrench
•••••••••••••••••••••••
••••••••••••••••
•••••••••••••••••
1
1
1
--- 2 ---
High-power motor
The Models G 10SR2, G 12SR2 and G 13SR2 are equipped with high-power motors and are more powerful
than the current Models G 10SR, G 12SR and G 13SR although they are compact and lightweight. We could
say that the ratio of the motor's maximum output to the product's weight defines its performance. Compared
with a typical competitor's model in terms of this indicator, the Models G 10SR2, G 12SR2 and G 13SR2 prove
to have the highest performance.
Table 1 Comparison of max. output and product weight
Maker
Model
Item
Max. output *
Actual product weight *
1
(W)
2
Max. output/product weight
(kg)
(W/kg)
G 10SR2/
G 12SR2/
G 13SR2
1,010
1.5 (3.3 lbs.)
673 (306 W/lbs.)
HITACHI
1.6 (3.5 lbs.)
525 (240 W/lbs.)
G 10SR/
G 12SR/
G 13SR
840
CB
700
1.5 (3.3 lbs.)
467 (212 W/lbs.)
750
1.4 (3.1 lbs.)
536 (241 W/lbs.)
*1 Depends on the market.
*2 Actual product weight excludes cord, side handle, depressed center wheel, wheel nut, wheel washer and wheel
guard.
Excellent overload durability
The Models G 10SR2, G 12SR2 and G 13SR2 provide excellent overload durability thanks to an improved
cooling mechanism and a high-power motor.
Practical test data: Comparison of torque when the stator coil temperature rise is 200˚K
116
G 10SR2/
G 12SR2
G 13SR2
106
114
100
97
100
Fig. 1
50
G 10SR/
G 12SR
C
B
0
G 13SR
C
050
Fig. 2
100
82
100
--- 3 ---
6. COMPARISONS WITH SIMILAR PRODUCTS
6-1. Specification Comparisons
Maker HITACHI
Model
G 10SR2/
G 12SR2
G 13SR2
G 10SR/
G 12SR
G 13SR
C
B
W
W
W
hr
kg
100 (4")/
115 (4-1/2")
1,010
254 (10")
60 (2-3/8")
1.4 (3.1 Ibs.)
125 (5")
650
370
10,000 10,000 11,000 10,000 11,000
86
140
Wheel diameter
Power input *
Output *
Max. output *
No-load speed 11,000
No-load sound
pressure level
Service life of
carbon brushes *
Grip perimeter 200 (7-7/8")
Dimension
Weight *
(Actual weight) (1.5) (3.3 Ibs.)
1
3
mm
1
1
/min.
dB/A
2
mm
mm
L
H
mm
100 (4")/
115 (4-1/2")
11,000
207 (8-1/8")
261 (10-1/4")
60 (2-3/8")
1.6 (3.5 Ibs.)
(1.6) (3.5 Ibs.)
600
370
840
87
90
125 (5")
100 (4")/
115 (4-1/2")
125 (5")
100 (4")/
115 (4-1/2")
540 670
310
700
82 82
130 100
195 (7-11/16") 191 (7-1/2")
256 (10-1/8") 263 (10-5/16")
70 (2-3/4") 73 (2-7/8")
1.4 (3.1 Ibs.) 1.4 (3.1 Ibs.)
(1.5) (3.3 Ibs.) (1.4) (3.1 Ibs.)
340
750
L
H
Grip perimeter
*1 Depends on the market.
*2 Service life of carbon brushes in the continuous rated load test.
3
Weight excludes cord, side handle, depressed center wheel, wheel nut, wheel washer and wheel guard.
*
--- 4 ---
6-2. Practical Test Data
G 13SR
C
G 13SR2
200
100
0
Load
Stator coil temp. rise (k)
Comparison of temperature rise of stator coil section:
The graph below shows the relationship between load and temperature rise of stator coil. The temperature rise of
the Models G 10SR2, G 12SR2 and G 13SR2 is the lowest among similar models. This means that the
resistance to overload usage of the Models G 10SR2, G 12SR2 and G 13SR2 is superior to other models.
G 10SR/G 12SR
200
100
Stator coil temp. rise (k)
0
C
B
G 10SR2/G 12SR2
Load
Fig. 3
Fig. 4
--- 5 ---
7. PRECAUTIONS IN SALES PROMOTION
In the interest of promoting the safest and most efficient use of the Models G 10SR2, G 12SR2 and G 13SR2 Disc
Grinders 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 or Caution 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 disc grinders 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.
7-2. Caution on Name Plate
Each tool is provided with a Name Plate which contains the following basic safety precautions in the use of the
tool.
(1) For European countries
(2) For U.S.A. and Canada
WARNING
To reduce the risk of injury, user must read and understand instruction manual.
Always use proper guards when grinding and wear eye protection.
Use only accessories rated at least * /min.
AVERTISSEMENT
Afin de reduire le risque de blessures, I'utilisateur doit lire et bien comprendre le mode d'emploi.
Utilisez toujours un outil muni d'un protecteur adequat et portez des lunettes on une visiere.
N'utilisez que des accessoires prevus pour au moins * /min.
* G 10SR2: 13,700
G 12SR2: 13,300
G 13SR2: 12,000
(3) For The People's Republic of China, New Zealand and Australia
CAUTION
Read thoroughly HANDLING INSTRUCTIONS before use.
--- 6 ---
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