Hitachi G 10SR2 User manual

POWER TOOLS
TECHNICAL DATA
AND
SERVICE MANUAL
DISC GRINDER
G 10SR2
G 12SR2
G 13SR2
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
LIST Nos. G 10SR2: E260
G 12SR2: E261
G 13SR2: E262
Feb. 2003
G
MODELS G 10SR2
G 12SR2
G 13SR2

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 Competitor
Company Name Model Name
MAKITA 9523NB
C
BOSCH GWS6-100
B
Symbols Utilized Competitor
Company Name Model Name
MAKITA 9524NB
C
BOSCH GWS6-115
B
Symbols Utilized Competitor
Company Name Model Name
MAKITA 9525NB
C
G 10SR2
G 12SR2
G 13SR2

Page
CONTENTS
1. PRODUCT NAME...........................................................................................................................1
2. MARKETING OBJECTIVE .............................................................................................................1
3. APPLICATIONS..............................................................................................................................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
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 ---
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. APPLICATIONS
•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
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
Compact body: 254 mm (10")
Maker B's model: 256 (10-1/8")
Maker C's model: 263 (10-5/16")
254 mm (10")

--- 2 ---
5. SPECIFICATIONS
Item Model
Depressed
center
wheel
Dimensions
Max. practical
peripheral speed
AC single phase 50 or 60 HzPower source
Voltage (V)
Voltage, current and
power input
11,000 /min.No-load speed
110
120
Current (A)
6.1
5.0
Power input (W)
650
Type of motor
Slide switchType of switch
Material: Housing
Tail cover
Gear cover, inner cover, packing gland
Enclosure
1.4 kg (3.1 lbs.)Net *1
2.2 kg (4.9 lbs.)Gross
Corrugated cardboard boxPackaging
Standard accessories *2Depressed center wheel
100 mm (4") •••••••••••••••• 1
Side handle ••••••••••••••••• 1
Wrench ••••••••••••••••••••••• 1
4,300 m/min.
(14,100 ft/min, 72 m/s)
G 10SR2
O.D. 100 mm (4")
x Thickness 4 mm (5/32")
x I.D. 16 mm (5/8")
*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.
Weight
AC single phase commutator motor
••••• Glassfiber reinforced polyamide resin (green)
580
220 3.0 650
230 2.9
240 2.8
O.D. 115 mm (4-1/2")
x Thickness 6 mm (1/4")
x I.D. 22 mm (7/8")
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)
G 12SR2 G 13SR2
10,000 /min.
••••• aluminum alloy die casting
2.4 kg (5.3 lbs.) 2.5 kg (5.5 lbs.)
Depressed center wheel
125 mm (5") •••••••••••••••• 1
Side handle ••••••••••••••••• 1
Wrench ••••••••••••••••••••••• 1
Depressed center wheel
115 mm (4-1/2") ••••••••••• 1
Side handle ••••••••••••••••• 1
Wrench ••••••••••••••••••••••• 1

--- 3 ---
Practical test data: Comparison of torque when the stator coil temperature rise is 200˚K
G 10SR2/
G 12SR2
G 10SR/
G 12SR
C
B
100 50 0
116
100
114
97 C
G 13SR
G 13SR2 106
100
82
050
100
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
Max. output *1(W)
Actual product weight *2 (kg)
Max. output/product weight (W/kg)
1,010
1.5 (3.3 lbs.)
673 (306 W/lbs.)
840
1.6 (3.5 lbs.)
525 (240 W/lbs.)
700
1.5 (3.3 lbs.)
467 (212 W/lbs.)
750
1.4 (3.1 lbs.)
536 (241 W/lbs.)
G 10SR2/
G 12SR2/
G 13SR2
G 10SR/
G 12SR/
G 13SR
CB
HITACHI
Maker
Model
Item
*1Depends on the market.
*2Actual 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.
Fig. 1 Fig. 2

--- 4 ---
6. COMPARISONS WITH SIMILAR PRODUCTS
6-1. Specification Comparisons
Maker HITACHI
Model G 10SR2/
G 12SR2
Wheel diameter 100 (4")/
115 (4-1/2")
mm
Power input *1650
Output *1370
Max. output *11,010
No-load speed 11,000
Grip perimeter 200 (7-7/8")
Dimension 254 (10")
H60 (2-3/8")
Weight *31.4 (3.1 Ibs.)
(Actual weight) (1.5) (3.3 Ibs.)
W
W
W
/min.
mm
mm
mm
kg
L
G 10SR/
G 12SR
600
370
840
11,000
207 (8-1/8")
261 (10-1/4")
60 (2-3/8")
1.6 (3.5 Ibs.)
(1.6) (3.5 Ibs.)
C
*1Depends on the market.
*2Service life of carbon brushes in the continuous rated load test.
*3Weight excludes cord, side handle, depressed center wheel, wheel nut, wheel washer and wheel guard.
No-load sound
pressure level 86
Service life of
carbon brushes *2140
dB/A
hr
87
90
Grip perimeter
G 13SR2
125 (5")
G 13SR
100 (4")/
115 (4-1/2") 125 (5")
B
100 (4")/
115 (4-1/2") 125 (5")
540 670
10,000 10,000 11,000 10,000 11,000
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.)
310
700
340
750
L
H
100 (4")/
115 (4-1/2")

--- 5 ---
6-2. Practical Test Data
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.
Fig. 3
Fig. 4
G 10SR/G 12SR
C
B
G 10SR2/G 12SR2
200
100
0
Load
Stator coil temp. rise (k)
G 13SR
C
G 13SR2
200
100
0
Load
Stator coil temp. rise (k)

--- 6 ---
(3) For The People's Republic of China, New Zealand and Australia
CAUTION
Read thoroughly HANDLING INSTRUCTIONS before use.
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

--- 7 ---
ON
OFF
0
ON
OFF 0
7-3. Precautions on Usage
(1) The wheel guard must be aligned in relation to the side handle mounting position.
As illustrated in Figs. 5 and 6, the customer should be instructed that the wheel guard mounting angle must be
aligned and fixed in accordance with the side handle mounting position so that the operator's hand will not
contact the depressed center wheel.
Fig. 5 Fig. 6
(2) Never press the pushing button while the depressed center wheel is rotating.
If the pushing button 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
off unexpectedly to cause possible serious injury.