Hitachi SV12SG Manual

TECHNICAL DATA
AND
SERVICE MANUAL
ORBITAL SANDER
SV 12SG
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
LIST No. 0353 Jun. 2004
S
MODEL
SV 12SG
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 B04552/B04553
C

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 ............................................................................................................................. 3
5-1. Specifications ......................................................................................................................................3
6. COMPARISONS WITH SIMILAR PRODUCTS ................................................................................. 4
7. PRECAUTIONS IN SALES PROMOTION ........................................................................................ 5
7-1. Handling Instructions ..........................................................................................................................5
7-2. Precautions on Nameplate .................................................................................................................5
8. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY ............................................................... 6
8-1. Disassembly .......................................................................................................................................6
8-2. Reassembly ........................................................................................................................................6
8-3. Tightening Torques .............................................................................................................................7
8-4. Wiring Diagram ...................................................................................................................................8
8-5. Insulation Tests ...................................................................................................................................8
8-6. No-load Current Value ........................................................................................................................8
9. STANDARD REPAIR TIME (UNIT) SCHEDULES ............................................................................ 9
Assembly Diagram for SV12SG

--- 1 ---
1. PRODUCT NAME
Hitachi Orbital Sander, Model SV 12SG
2. MARKETING OBJECTIVE
The Model SV 12SF orbital sander has been on the market for 9 years. To meet a demand for a remodeled, we
now offer totally renewed design for increased competitiveness and expanded sale. The Model SV 12SG has
been developed to upgrade and replace the current Models SV 8SA, SV 12SA and SV 12SF.
The key features of the Model SV 12SG are as follows:
(1) High power and class-top sanding amount
(2) Class-top dust collecting performance
(3) All new design. The large soft grip comfortably fits in the palm of a hand for ease of operation.
3. APPLICATIONS
Finish polishing of woodwork surface
Sanding surface of woodwork or sheet metal prior to painting, etc.
4. SELLING POINTS
Class-top dust collecting performance
1.27 times higher compared to current model.
1.44 times higher compared to C.
High power and class-top sanding amount
1.33 times higher compared to current model.
1.25 times higher compared to C.
All new design
The large soft grip comfortably fits in the palm
of a hand for ease of operation.
Current model and C: Not provided.

--- 2 ---
* Testing conditions for measurement of the sanding amount and the percentage of dust collection
Workpiece: Lauan Pressing load: 29.4 N (3 kgf)
Sanding time: 15 minutes Sanding paper: WA100
4-1. Selling Point Descriptions
(1) High power and class-top sanding amount
Maker
HITACHI
C
Sanding amount
20 g
15 g
16 g
Model
SV 12SG
SV 12SF
Sanding ratio
100
75
80
Maker
HITACHI
C
Rated input
200 W (120 V, 1.7 A)
200 W (115 V, 1.4 A)
160 W (115 V, 1.6 A)
Model
SV 12SG
SV 12SF
Rated input ratio
100 (100)
100 (82)
80 (94)
Maker
HITACHI
C
Maximum output
101 W
90 W
92 W
Model
SV 12SG
SV 12SF
Maximum output ratio
100
89
91
Maker
HITACHI
C
Percentage of dust collection
56 %
44 %
39 %
Model
SV 12SG
SV 12SF
Dust collection ratio
100
79
70
(2) Class-top dust collecting performance
(3) All new design. The large soft grip comfortably fits in the palm of a hand for ease of operation.
The Model SV 12SG has a large soft grip that comfortably fits in the palm of a hand (double molded housing
with elastomer). It is easier to operate than the current model and C.

--- 3 ---
Enclosure
Housing Glassfiber reinforced polycarbonate (green)
and elastomer (black)
Glassfiber reinforced polycarbonate (black)
••••••••••••••••••••
200 W
5. SPECIFICATIONS
5-1. Specifications
Sanding paper size
Power source
Weight
Packaging
* Standard accessories
114 mm x 140 mm (4-1/2" x 5-1/2")
AC single phase 50 Hz or 60 Hz
1.1 kg (2.4 lbs.)
1.6 kg (3.5 lbs.)
Corrugated cardboard box
Sanding paper ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Dust bag •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Voltage, current and
power input
Type of switch Slide switch
AC single phase commutator motor
Type of motor
Item Specifications
110 mm x 100 mm (4-3/8" x 4")
1.5 mm (1/16")
110 V
1.9 A
No-load speed 14,000/min.
Net*(excludes cord)
Gross
*: Depends on the market.
Sanding pad size
Orbital diameter
220 V
0.95 A
230 V
0.91 A
240 V
0.87 A
120 V
1.7 A
Base •••••••••••••••••••••••••

--- 4 ---
6. COMPARISONS WITH SIMILAR PRODUCTS
Maker •Model
Item
Sanding paper size
Sanding pad size
W
/min
kg
Power input
No-load noise level
Weight (excludes cord)
Max. output *1
No-load noise level *1
Orbital diameter
mm
mm
mm
Overall height
*1: Depends on the market.
Standard accessories *1
No-load vibration level *1
Sanding paper (1 pc.)
Dust bag (1 pc.)
HITACHI
SV 12SG
114 x 140
(4-1/2" x 5-1/2")
200
(120 V, 1.7 A)
14,000
1.1
(2.4 lbs.)
101
110 x 100
(4-3/8" x 4")
79
1.5
(1/16")
114
137 (5-3/8")
Provided
Name plate and catalog
specifications
dB
dB
mm
W
Soft-touch grip
SV 12SF
Sanding paper (1 pc.)
Dust bag (1 pc.)
114 x 140
(4-1/2" x 5-1/2")
200
(115 V, 1.4 A)
14,000
1.1
(2.4 lbs.)
90
110 x 100
(4-3/8" x 4")
84
1.5
(1/16")
125
139 (5-1/2")
Not provided
Sanding paper (6 pcs.)
Dust bag (1 pc.)
Punch plate (1 pc.)
115 x 140
(4-1/2" x 5-1/2")
160
(115 V, 1.6 A)
14,000
0.95
(2.1 lbs.)
92
116 x 104
(4-1/2" x 4")
83
1.5
(1/16")
119
137 (5-3/8")
Not provided
C

--- 5 ---
7. PRECAUTIONS IN SALES PROMOTION
In the interest of promoting the safest and most efficient use of the Model SV 12SG Orbital Sander 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 nameplate 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 the hand shear 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. Precautions on Nameplate
Each Model SV 12SG is provided with a nameplate which lists basic safety precautions (illustrated below) in its
use. Carefully ensure that the customer fully understands and follows these precautions before using the tool.
(1) For the U. S. A. and Canada
(2) For New Zealand and Australia
(3) For China

--- 6 ---
8. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY
The [Bold] numbers in the descriptions below correspond to the item numbers in the Parts List and exploded
assembly diagram.
8-1. Disassembly
(1) Removal of the Armature [25] and the Stator [22]
Remove the four Machine Screws M4 x 10 [18], and remove the surrounding parts such as the Pad [17], Base
[16] and Felt [34].
Remove the two Tapping Screws (W/Flange) D4 x 16 [33], and remove the Fan Guide [32].
Keeping a screwdriver inserted into the clearance of the Balance Fan [27], remove the Seal Lock Flat Hd.
Screw M4 x 12 [31]. Remove the Washer [30], Ball Bearing 6001DDCMPS2L [29], Dust Washer [28] and
Balance Fan [27].
Remove the four Tapping Screws (W/Flange) D4 x 20 (Black) [2], and remove Housing (A).(B) Set [3].
Remove the Carbon Brush [13] together with the Brush Holder [12]. Lift the Stator [22] and pull out the
Armature [25].
After pulling out the Armature [25], disconnect the Internal Wire (Brown) [5], Internal Wire (Blue) [24], Tab
Terminal (Blue) [6] and Tab Terminal (Brown) [23] from the terminals of the Stator [22]. Then pull out the
Stator [22].
8-2. Reassembly
Reassembly can be accomplished by following the disassembly procedures in reverse. However, special
attention should be given to the following items.
(1) Assembly of the Dust Washer [28]
Be sure to mount the Dust Washer [28] in correct direction as shown in Fig. 1. Otherwise, the Ball Bearing
6001DDCMPS2L [29] can be damaged at an early stage.
Fig. 1
Dust Washer [28]
Ball Bearing 6001DDCMPS2L [29]
1
2
3
4
6

--- 7 ---
Fig. 2
Tab Terminal (Blue) [6]
Viewed from the commutator
Internal Wire (Brown) [5]
Internal Wire (Blue) [24]
Tab Terminal (Brown) [23]
8-3. Tightening Torques
(1) Tapping Screw (W/Flange) D4 x 20 (Black) [2] ..................... 2.0 0.5 N•m (20 5 kgf•cm, 1.5 0.4 ft-lbs.)
(2) Tapping Screws (W/Flange) D4 x 16 [7] [33] ........................ 2.0 0.5 N•m (20 5 kgf•cm, 1.5 0.4 ft-lbs.)
(3) Tapping Screw (W/Flange) D4 x 10 (Black) [15] ................... 2.0 0.5 N•m (20 5 kgf•cm, 1.5 0.4 ft-lbs.)
(4) Machine Screw M4 x 10 [18] ................................................. 1.8 0.4 N•m (18 4 kgf•cm, 1.3 0.3 ft-lbs.)
(5) Seal Lock Flat Hd. Screw M4 x 12 [31] ................................. 1.8 0.4 N•m (18 4 kgf•cm, 1.3 0.3 ft-lbs.)
(2) Wiring the Stator [22]
When wiring the Stator [22], be sure to insert each terminal in correct direction as shown in Fig. 2. At this
time, securely insert each terminal as far as it will go.

--- 8 ---
Fig. 3
8-4. Wiring Diagram
Internal Wire (Blue) [24]
Tab Terminal (Brown) [23]
8-5. Insulation Tests
On completion of disassembly and repair, measure the insulation resistance and conduct the dielectric strength
test.
Insulation resistance: 7 M Ωor more with DC 500 V megohm tester
Dielectric strength: AC 4,000 V/1 minute, with no abnormalities ••••••• 220 V --- 240 V
AC 2,500 V/1 minute, with no abnormalities ••••••• 110 V --- 127 V
8-6. No-load Current Value
After no-load operation for 30 minutes, the no-load current value should be as follows:
Internal Wire (Brown) [5]
Slide Switch [20]
Black or brown
Cord
White or blue
Tab Terminal (Blue) [6]
Noise Suppressor [4]
For NZL, AUS, EUROPE, CHN
Pillar Terminal [19]
Voltage (V)
Current (A) max. 1.50
110 V
1.45
120 V 220 V
0.75
230 V 240 V
Stator [22]
Stator [22]

--- 9 ---
9. STANDARD REPAIR TIME (UNIT) SCHEDULES
MODEL 10 20 30 40
Fixed
Variable
SV 12SG Work Flow
Ball Bearing
626VV
Ball Bearing
629VV
Balance Fan
Fan Guide
Paper Clip x 2 Base
Ball Bearing
6001DD
60 min.
50
Slide Switch
Cord
Cord Armor
Housing
(A).(B) Set
Stator
General Assembly
Armature
Leg x 2

ELECTRIC TOOL PARTS LIST
LIST NO. 0353
ORBITAL SANDER
Model SV 12SG
2004
•
3
•
30
(E1)
Hitachi Power Tools
1
2
3
45
10
19
21 22
11
13
14
14
35
15
12
24
23
7
501
502
503
20
8
9
6
27
28
29
30
32
33
34
31
26
25
16
17
18

*ALTERNATIVE PARTS
--- 2 ---
ITEM
NO. CODE NO. DESCRIPTION REMARKS
NO.
USED
PARTS
3 -- 04
SV 12SG
1NAME PLATE 1
2301-653 TAPPING SCREW (W/FLANGE) D4X20 (BLACK) 4
3322-766 HOUSING (A).(B) SET 1
*4930-039 NOISE SUPPRESSOR 1
FOR NZL, AUS, GBR, EUROPE, NOR, SUI, CHN
5322-764 INTERNAL WIRE (BROWN) 1
6322-761 TAB TERMINAL (BLUE) 1
7984-750 TAPPING SCREW (W/FLANGE) D4X16 2
8937-631 CORD CLIP 1
*9500-409Z CORD 1 (CORD ARMOR D8.8)
*9500-439Z CORD 1 (CORD ARMOR D8.8) FOR NZL, AUS
*9500-423Z CORD 1 (CORD ARMOR D8.8) FOR SIN
*9500-240Z CORD 1 (CORD ARMOR D8.8) FOR USA, CAN
*9500-435Z CORD 1
(CORD ARMOR D8.8) FOR HKG, GBR (230V)
*9500-461Z CORD 1 (CORD ARMOR D8.8) FOR GBR (110V)
*9500-447Z CORD 1 (CORD ARMOR D8.8) FOR SUI
*9500-468Z CORD 1 (CORD ARMOR D8.8) FOR CHN
10 953-327 CORD ARMOR D8.8 1
11 HITACHI LABEL 1
12 930-483 BRUSH HOLDER 2
13 999-041 CARBON BRUSH (1 PAIR) 2
14 322-756 LEG 2
15 311-945 TAPPING SCREW (W/FLANGE) D4X10 (BLACK) 2
16 322-759 BASE 1
*17 310-354 FELT PAD (PERFORATED) 1
*17 310-355
PAD (PRESSURE SENSITIVE TYPE, PERFORATED) 1 FOR FRA, BEL, SUI
*17311-978 PAD (QUICK STICK TYPE, PERFORATED) 1 FOR USA, CAN
18 949-216 MACHINE SCREW M4X10 (10 PCS.) 4
19 938-307 PILLAR TERMINAL 1
20 311-948 SLIDE SWITCH (1P SCREW TYPE) 1
21 626-VVM BALL BEARING 626VVC2PS2L 1
*22 340-578C STATOR 110V 1
*22 340-578D STATOR 120V 1
*22 340-578E STATOR 220V-230V 1
*22 340-578F STATOR 240V 1
23 322-762 TAB TERMINAL (BROWN) 1
24 322-763 INTERNAL WIRE (BLUE) 1
*25 360-637C ARMATURE 110V 1
*25 360-637U ARMATURE ASS’Y 120V 1 INCLUD. 21, 26
*25 360-637E ARMATURE 220V-230V 1
*25 360-637F ARMATURE 240V 1
26 629-VVM BALL BEARING 629VVC2PS2L 1
27 322-757 BALANCE FAN 1
28 993-052 DUST WASHER 1
29 600-1DD BALL BEARING 6001DDCMPS2L 1
30 987-169 WASHER 1
31 993-244 SEAL LOCK FLAT HD. SCREW M4X12 1
32 322-758 FAN GUIDE 1
33 984-750 TAPPING SCREW (W/FLANGE) D4X16 2
34 311-946 FELT 1
35 322-760 PAPER CLIP 2

*ALTERNATIVE PARTS --- 3 ---
STANDARD ACCESSORIES
OPTIONAL ACCESSORIES
ITEM
NO. CODE NO. DESCRIPTION REMARKS
NO.
USED
ITEM
NO. CODE NO. DESCRIPTION REMARKS
NO.
USED
3 -- 04
SV 12SG
* 501 310-339 DUST BAG 1
* 501 323-004 DUST BAG 1 FOR USA, CAN
* 502 310-342 SANDING PAPERS 114X140 AA100 (10 PCS.) 1FOR FELT PAD
* 502 310-345 SANDING PAPERS 110X100 AA100 (10 PCS.) 1FOR PAD, PRESSURE SENSITIVE TYPE
FOR FRA, BEL, SUI
* 502 310-348
SANDING PAPERS (B)110X100 AA80 (10 PCS.) 1FOR PAD, QUICK STICK TYPE FOR USA, CAN
*503 310-340 PUNCH PLATE 1 FOR NZL
* 601 310-354 FELT PAD (PERFORATED) 1 FOR FRA, BEL, SUI, USA, CAN
* 602 310-355
PAD (PRESSURE SENSITIVE TYPE, PERFORATED) 1EXCEPT FOR FRA, BEL, SUI
* 603 311-978 PAD (QUICK STICK TYPE, PERFORATED) 1 EXCEPT FOR USA, CAN
604 310-356
PAD(B)125MM (QUICK STICK TYPE, PERFORATED) 1ROUND TYPE
605 310-340 PUNCH PLATE 1
606 310-341 SANDING PAPERS 114X140 AA60 (10 PCS.) 1 FOR FELT PAD, PAPER CLIP TYPE
607 310-343
SANDING PAPERS 114X140 AA150 (10 PCS.) 1 FOR FELT PAD, PAPER CLIP TYPE
608 310-344 SANDING PAPERS 110X100 AA60 (10 PCS.) 1FOR PAD, PRESSURE SENSITIVE TYPE
609 310-346 SANDING PAPERS 110X100 AA150 (10 PCS.) 1FOR PAD, PRESSURE SENSITIVE TYPE
610 310-347
SANDING PAPERS (B) 110X100 AA60 (10 PCS.) 1FOR PAD, QUICK STICK TYPE
611 310-349 SANDING PAPERS (B) 110X100 AA100 (10 PCS.) 1FOR PAD, QUICK STICK TYPE
612 310-350 SANDING PAPERS (B) 110X100 AA120 (10 PCS.) 1FOR PAD, QUICK STICK TYPE
613 310-351 SANDING PAPERS (B) 110X100 AA150 (10 PCS.) 1FOR PAD, QUICK STICK TYPE
614 310-352 SANDING PAPERS (B) 110X100 AA180 (10 PCS.) 1FOR PAD, QUICK STICK TYPE
615 310-353 SANDING PAPERS (C) 125MM AA60 (10 PCS.) 1FOR PAD, QUICK STICK TYPE

--- 4 ---
ITEM
NO. CODE NO. DESCRIPTION REMARKS
NO.
USED
3 -- 04
SV 12SG
Printed in Japan
(040330N)