Hitachi W 6VB2 User manual

POWER TOOLS
TECHNICAL DATA
AND
SERVICE MANUAL
SCREW DRIVER
W 6VB2, W 8VB
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
LIST Nos. W 6VB2: 0780
W 8VB: 0781 Jul. 1999
W
MODEL
W 6VB2
W 8VB

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:
Model: W 6VB2
Symbols Utilized Competitors
Company Name Model Name
MAKITA 6802BV
B BOSCH GSR6-20TE
(1423VSR)
C
PDeWALT DW266
Model: W 8VB
Symbol Utilized Competitor
Company Name Model Name
DeWALT DW265
P

Page
CONTENTS
[ Business Section ]
1. PRODUCT NAME •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
2. MARKETING OBJECTIVE •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
3. APPLICATIONS •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
1
4. SELLING POINTS •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
1
5. SPECIFICATIONS •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
2
5-1. Specifications ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 2
5-2. Optional Accessories ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 3
6. COMPARISONS WITH SIMILAR PRODUCTS •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 4
6-1. W 6VB2 ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 4
6-2. W 8VB ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 4
6-3. Screw tightening time •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 5
7. PRECAUTIONS IN SALES PROMOTION ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 6
7-1. Handling Instructions •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 6
7-2. Caution Plates ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 6
7-3. Screw Driving-Depth Adjustment •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 6
7-4. Self-Drilling Screws •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 7
7-5. Dry-Wall Screws ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 7
7-6. Variable-Speed Switch •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 8
8. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 8
8-1. Disassembly ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 8
8-2. Reassembly ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 9
8-3. Wiring Diagrams •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 10
8-4. Internal Wire Arrangement and Wiring Work ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 11
8-5. Insulation Tests •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 13
8-6. No-load Current Values •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 13
9. STANDARD REPAIR TIME (UNIT) SCHEDULES •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 14
[ Appendix ]
Assembly Diagram for W 6VB2 ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 15
Assembly Diagram for W 8VB ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 19

--- 1 ---
1. PRODUCT NAME
Hitachi Screw Driver, Models W 6VB2
W 8VB
2. MARKETING OBJECTIVE
The W 6VB screw driver has been on the market for 14 years. The new W 6VB2/W 8VB are totally redesigned
with an easy-to-grip body structure and other features in response to the diverse needs of customers. In
particular, the W 8VB has been introduced to meet the demand for higher torque. Our market share is expected
to grow with the release of these new models which broaden our lineup of screw drivers.
3. APPLICATIONS
Hex. and Teks screws: Fastening metal onto metal, or metal onto wood
Exterior construction Installation of siding on buildings
Installation of galvanized iron sheet or corrugated sheet roofing
Plate assembly Assembly and mounting of advertising billboards
Assembly of metal frames for vinyl greenhouses
Assembly and installation of automobile stamped sections
Various other interior/exterior construction and plate assembly jobs
Drywall screws: Fastening metal studs and drywall
Interior construction Installation of ceilings, paneling or partitions in offices,
shops, supermarkets, apartment houses, schools, factories, etc.
Wood screws: Interior construction Assembly and installation of interior wood paneling,
Installation of flooring in gymnasiums and similar buildings
4. SELLING POINTS
Detachable nosepiece for:
Easy unscrewing
Easy bit changes
Compact and lightweight
Overall length: 285 mm (11-1/4")
Weight: 1.4 kg (3.1 Ibs)
High-power motor:
Speedy screw fastening

--- 2 ---
5. SPECIFICATIONS
5-1. Specifications
Model
Capacity Self-drilling screw
Bit mounting size
Power source
Full-load current
Power input
Switch
W 6VB2
6 mm (1/4")
Single phase, AC 50 Hz or 60 Hz
U.S.A., Canada
U.S.A., Canada
Drywall screw
Type of motor
W 8VB
Wood screw
6 mm (1/4")
5.8 mm dia. x 50 mm ( 7/32" dia. x 2")
6.35 mm (1/4")
Single phase, AC commutator motor
6.4 A (115 V)
Other areas 2.9 A (220 V) 5.9 A (110 V) 2.8 A (230 V)
2.7 A (240 V)
640 W
Other areas 600 W
No-load speed
Full-load speed
0 --- 2,600 /min 0 --- 1,700 /min
0 --- 2,000 /min 0 --- 1,200 /min
Housing, Handle cover, Inner cover and Gear cover
••••••••••••••••••••••••••••••••••••••••••••••••••••Polyamide resin
Enclosure
Handle
Variable switch with reversing switch
Pistol grip handle
Weight Net •••••••••••••••1.4 kg (3.1 Ibs) (without cord)
Gross •••••••••••1.9 kg (4.2 Ibs)
Packaging
Cord Type
Overall length
Two core cabtire cable
2.5 m (8.2 ft.)
Corrugated cardboard box
Standard accessory Magnetic hexagon socket •••••••••••••••••••••••••••••••••••••••• 1

--- 3 ---
Sub-stopper (B)Hex-socket
5-2. Optional Accessories
(1) For hex-head screws
Magnetic type Non magnetic type
H = 6.35 mm H = 6.35 mm
H = 7.94 mm H = 7.94 mm
H = 9.53 mm H = 9.53 mm
H = 10 mm H = 10 mm
H 1/4
H 5/16
H 3/8
Screw
head
(2) For other screws
Bit type Bit holder Sub-stopper
No.1
No.2
No.3
No.1
No.2
No.1
No.2
No.3
No.1
No.2
B size
4 mm
5 mm
B
Magnetic bit holder
(Short type)
Magnetic bit holder
Non-magnetic bit bolder
Sub-stopper (A)
Sub-stopper (C)
(3) Hook
(4) Plastic case
Optional accessories are subject to change without notice.

--- 4 ---
6. COMPARISONS WITH SIMILAR PRODUCTS
6-1. W 6VB2
Maker
Model
Capacity Self-drilling screw
Dry-wall screw
Wood screw
Power input U.S.A.
Other areas
Voltage, Full-load current
No-load rotation
No-load noise level
Max. output
Overall length
Cord length
Weight
mm
mm
mm
W
V, A
/min
dB (A)
W
mm
m
kg
W 6VB2 W 6VB
HITACHI CBP
666 66.3
665------
---
--- --- ---
---
---
---
5.8 dia. x 50 5.8 dia. x 50
680
600
115, 6.4
0 --- 2600
79
640
285
2.5
1.4
520
520
115, 5.0
81
0 --- 2600
550
290
1.7
2.5 2.5
1.7 1.9 1.6
2.4
265 305 300
485 560 540
80 82 82
0 --- 26000 --- 2500 0 --- 2000
115, 4.8 120, 5.5 120, 6.5
510 600
6-2. W 8VB
Maker
Model
Capacity Self-drilling screw
Dry-wall screw
Wood screw
mm
mm
mm
W
Power input U.S.A.
Other Areas
Voltage, Full-load current
No-load rotation
No-load noise level
Max. output
Overall length
Cord length
Weight
V, A
/min
dB (A)
W
mm
m
kg
HITACHI P
W 8VB
88
6
680
6.2 dia. x 50
600
115, 6.4
0 --- 1700
79
640
285
2.5
1.4
120, 6.5
0 --- 2000
83
540
300
2.4
1.6
---
---
---
---
2.5

--- 5 ---
6-3. Screw tightening time
Tables 1 and 2 show the relationship between thrust and tightening time based on factory tests. The tightening
time may vary a little as screws are not necessarily uniform. The time information is for reference.
<W 6VB2>
Tightening condition
Teks screw:
5 dia. x 25L (13/64" x 1")
Mild steel plate: T3.2 (1/8")
120 V 60 Hz
W 6VB2 W 6VB
Mean tightening time (sec.)
CBP
2.70 3.00 2.90
3.502.60 ---2.40
---
---
---
4.80
4.00
---
---
3.60
---
3.20 ---
3.60
2.70
3.20
4.00
4.20
0.40
0.60
3.40
---
2.90
3.90
---
---
0.55 --- 0.75
0.50 0.40
--- 5.70
4.304.00
--- 3.80 3.302.80 ---
Teks screw:
5 dia. x 25L (13/64" x 1")
Mild steel plate: T5 (13/64")
Teks screw:
6 dia. x 25L (15/64" x 1")
Mild steel plate: T3.2 (1/8")
Teks screw:
6 dia. x 25L (15/64" x 1")
Mild steel plate: T5 (13/64")
Wood screw
5.8 dia. x 38L (7/32" x 1-1/2")
Wood: Lauan
Power source HITACHI
230 V 50 Hz
120 V 60 Hz
230 V 50 Hz
120 V 60 Hz
120 V 60 Hz
120 V 60 Hz
230 V 50 Hz
230 V 50 Hz
230 V 50 Hz
---
---
--- ---
---
Table 1
<W 8VB>
Tightening condition
Teks screw:
5 dia. x 25L (13/64" x 1")
Mild steel plate: T3.2 (1/8")
120 V 60 Hz
W 8VB
Mean tightening time (sec.)
P
3.90
4.00 ---
5.30 4.90
5.30
4.40
4.00
5.50
6.30
0.70
0.70
---
3.90
---
---
5.40
0.60
---
Teks screw:
5 dia. x 25L (13/64" x 1")
Mild steel plate: T5 (13/64")
Teks screw:
6 dia. x 25L (15/64" x 1")
Mild steel plate: T3.2 (1/8")
Teks screw:
6 dia. x 25L (15/64" x 1")
Mild steel plate: T5 (13/64")
Wood screw:
5.8 dia. x 38L (7/32" x 1-1/2")
Wood: Lauan
Power source HITACHI
230 V 50 Hz
120 V 60 Hz
230 V 50 Hz
120 V 60 Hz
120 V 60 Hz
120 V 60 Hz
230 V 50 Hz
230 V 50 Hz
230 V 50 Hz
3.80
Table 2

--- 6 ---
7. PRECAUTIONS IN SALES PROMOTION
In the interest of promoting the safest and most efficient use of the Models W 6VB2 and W 8VB electric
screwdrivers by all of our customers, it is very important that at the time of sales 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 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 electric screwdriver 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 Plates
The following basic safety precautions are listed on the Name Plate attached to the main body of each tool.
However, these precautions are not listed for European countries.
For Asia and Oceania
CAUTION
Read thoroughly HANDLING INSTRUCTIONS before use.
For the U.S.A. and Canada
WARNING
To reduce the risk of injury, user must read and
understand instruction manual
AVERTISSEMENT
Afin de reduire le risque de blessures, l'utilisateur doit
lire et bien comprendre le mode d'emloi.
7-3. Screw Driving-Depth Adjustment
Information and suggestions for screw driving-depth selection for applicable screws are described in the Handling
Instructions. The salesperson must be thoroughly familiar with screw driving-depth adjustment procedures to be
able to instruct the customer/user in performing adjustment so that the screw neither protrudes above nor sinks
excessively below the surface of the workpiece into which the screw is driven.

--- 7 ---
Specific adjustment procedures are as follows
(1) Head of screw protrudes above workpiece surface (Fig. 1)
If dimension A in Fig. 3 is excessively small, the head of the driven screw will protrude above the surface of the
workpiece material as shown in Fig. 1. To adjust dimension A, pull the lock sleeve in the direction indicated by
the arrow in Fig. 3 to disengage the lock sleeve from the gear cover spline, and rotate the lock sleeve
clockwise as viewed from the screw mounting end (see Note below). Repeat adjustment as necessary until
the head of the driven screw is properly aligned with the surface of the workpiece.
(2) Head of screw sinks below workpiece (Fig. 2)
If dimension A in Fig. 3 is excessively large, the head of the driven screw will sink below the surface of the
workpiece as shown in Fig. 2. To perform adjustment, follow the procedures described in item (1) above, but
rotate the lock sleeve counter-clockwise.
Should Hex and Teks screws be driven when dimension A is excessively large, both the screws and bits may
be easily damaged. Instruct customers/users to perform adjustment correctly without fail.
(NOTE) By turning the lock sleeve clockwise or counter-clockwise, dimension A in Fig. 3 can be adjusted
within a maximum dimension of 1.5 mm (0.059"). One complete rotation of the lock sleeve is
divided into ten settings, each setting permitting an adjustment of 0.15 mm (0.006"). Accordingly,
if dimension B in Fig. 1 is 0.3 mm (0.012"), rotate the lock sleeve by two settings.
7-4. Self-Drilling Screws
Self-drilling screws are most suitable for joining wooden and metal materials, mounting metallic components onto
iron sheets, or installing roofing materials. Self-drilling and self-tapping, they are commonly employed in the
construction industry because:
Separate drilling and tapping processes are not required when securing wooden materials to metal materials.
Consequently, job costs and processes can be drastically reduced.
7-5. Drywall Screws
Drywall screws are most suitable for interior decorating and construction utilizing such materials as gypsum board
and plastic board. Their main features are:
Like Hex and Teks screws, drywall screws are self-drilling, and can reduce work time.
Wall panels can be mounted cleanly without cracks or chips.
Drywall screws display far stronger holding power than conventional screws when applied to materials
composed of powder or particles, such as gypsum board.
Fig. 1 Fig. 2 Fig. 3
Screw Locator Gear cover
Lock sleeve
Sub-stopper
A
Material into which screw
is driven
Material into which screw
is driven
Screw Screw
B

--- 8 ---
7-6. Variable-Speed Switch
This switch is equipped with a variable speed control circuit. Through the control circuit, the speed can be
controlled up to 75 % of maximum speed according to the degree at which the switch is depressed.
A disadvantage of this system is that if the bit becomes locked resulting in stoppage of the motor, the speed
control circuit may be burnt out. In such a case, the switch should be released immediately or turned OFF. To
avoid damage to the switch circuit, the customer should be advised to increase driving speed gradually until the
screw is driven approximately halfway into the workpiece, then depress the trigger to obtain optimum speed.
Fig. 4
Switch characteristics (Approximately shown converted into the linear line)
Maximum speed change point
Trigger stroke
speed
8. PRECAUTIONS IN DISASSEMBLY AND REASSEMBLY
The [BOLD] numbers in the descriptions below correspond to the item numbers in the Parts List and the exploded
assembly diagram.
8-1. Disassembly
A. Disassembly of the parts within the handle
(1) Removal of the Handle Cover
Loosen the three Tapping Screws D4 x 20 [31], and remove the Handle Cover [29].
(2) Removal of the Carbon Brushes
With a small flat-blade screwdriver, lift up on the Brush Holder [36], and pull it out slightly.
Next, pull out the terminal portion which connects the two Carbon Brushes [35] and the lead wires from the
Speed Control Switch [32]. When pulling the terminal, it is best to push the Carbon Brushes fully into the
Brush Holder.
(3) Removal of the Cord
Loosen the two Tapping Screws D4 x 16 [44] which retain the Cord Clip [45], and remove the Cord [48]
together with the Cord Armor [46].
B. Removal of the armature and stator
(1) Removal of the Armature
Remove the three Tapping Screws D4 x 40 [9] from the Gear Cover Ass'y [10], and remove the Inner
Cover Ass'y [23] from the Housing [29]. The Armature [25] can then be taken out.
(2) Removal of the Stator
First, remove the Fan Guide [26] from the inside of the Housing.
Then, loosen the two Tapping Screws D4 x 50 [27], and lightly tap the end surface of the Housing [29] with
a wooden hammer to loosen and remove the Stator [28].
100 %
75 %
0

--- 9 ---
C. Removal of the socket (B) ass'y, gear ass'y and second pinion ass'y
(1) Remove the Gear Cover Ass'y [10] and the Inner Cover Ass'y [23], then the Socket (B) Ass'y [12], Gear
Ass'y [15] and Second Pinion Ass'y [20] can be removed. If the Gear Ass'y [15] is hard to remove, lightly
tap the end surface of the Inner Cover Ass'y [23] with a wood hammer. If the Second PinionAss'y [20] is
hard to remove, lightly tap the end surface of the Gear Cover Ass'y [10] with a wood hammer. Be careful
not to lose the Spring [14] on the outer circumference of the Gear Shaft [16] and the Washer [22] on the
outer circumference of the Second Pinion Ass'y [20].
As shown in Fig. 5, insert two flat-blade screwdrivers between the Inner Cover Ass'y [23] and Gear Ass'y
[15] at each side and remove the Gear Ass'y [15], Gear Shaft [16] and Ball Bearing [17] from the Inner
Cover Ass'y as a single unit.
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) Lubrication
Grease: Hitachi Motor Grease (Code No. 930035)
Application:
(a) Fill a moderate amount of grease in the Gear Cover Ass'y [10]. (If the Gear Cover Ass'y is new, fill it with
7 g of grease.)
(b) Outer circumference and clutch of the Socket (B) Ass'y [12]
(c) Teeth and clutch of the Gear Ass'y [15]
(d) Outer circumference of the Gear Shaft [16]
(e) Teeth and outer circumference of the Second Pinion Ass'y [20]
(f) Teeth of the First Gear [21]
(g) Pinion of the Armature [25]
(2) Tightening torque
Handle cover retaining screws •••••••••••••••••••••••••••••••••••••••••••••••••••••• 15 --- 25 kg•cm (13.0 --- 21.7 Ibs-in)
Cord clip retaining screws ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 15 --- 25 kg•cm (13.0 --- 21.7 Ibs-in)
Gear cover retaining screws •••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 15 --- 25 kg•cm (13.0 --- 21.7 Ibs-in)
Stator retaining screws ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 15 --- 25 kg•cm (13.0 --- 21.7 Ibs-in)
Speed control switch retaining screws •••••••••••••••••••••••••••••••••••••••••••• 4 --- 8 kg•cm (3.5 --- 6.9 Ibs-in)
Fig. 5
Inner Cover Ass'y [23] Gear Shaft [16]
Gear
Ass'y [15]
Flat-blade screwdriver Flat-blade screwdriver

--- 10 ---
Choke coil
8-3. Wiring Diagrams
(1) Products with noise suppressor
Fig. 6
Variable switch
White Gray
Stator
Reversing switch
Noise
suppressor
Blue
Brown
RedYellow
Capacitor
Stator
Power source
1
M1
C1
24
13
Ar
Choke coil
2
M2
C2
(2) Products without noise suppressor
Fig. 7
Stator
Stator
White Gray
Yellow Red
Variable switch Reversing switch
Power source
Blue
Brown
Ar
Choke coil
Choke coil
M1
1
2
M2
24
13

--- 11 ---
8-4. Internal Wire Arrangement and Wiring Work
A. Internal wire arrangement
Fig. 8 Schematic diagram
Insert earth terminal between
stator core and housing
White
(Stator)
Brown
(Carbon brush)
Blue
(Carbon brush)
Gray
(Stator)
Blue
(Carbon brush)
White
(Stator)
Yellow
(Stator)
Noise suppressor

--- 12 ---
(Carbon brush) (Stator)
(Stator) (Carbon brush)
Red
Brown
Gray
Blue
Fig. 9 Wiring of reversing switch
B. Additional wiring work
General internal wiring can be accomplished by
referring to paragraph 8-3 and 8-4-A. The followings
are special instructions for switch connection.
(1) Wiring of reversing switch
Insert the lead wire (red) coming from the stator
into the terminal (1) of the reversing switch, and
the lead wire (gray) into the terminal (2) as shown
in Fig. 9. Insert the lead wire (brown) coming
from the carbon brush into the terminal (3) and
the lead wire (blue) into the terminal (4). After
insertion, pull each lead wire slightly to check that
the lead wires do not come off. To disconnect the
lead wires, insert a small flat-blade screwdriver
into the slots near the terminals and pull out the
lead wires.

--- 13 ---
(2) Wiring of variable speed control switch
Insert each cord into the terminal 1 ↑ and
terminal 2 ↑ of the speed control switch as shown
in Fig. 10, and tighten the screw [tightening
torque: 0.6 _+0.2 N•m (6 _+2 kgf•cm, 5.2 _+1.7
Ibs-in)]. Insert the lead wire (white) coming from
the stator into the terminal M1 and the lead wire
(yellow) into the terminal M2. Insert each lead
wire (white) coming from the noise suppressor
into the terminal C1 and C2. After insertion, pull
each lead wire slightly to check the lead wires do
not come off. To disconnect the lead wires, insert
a small flat-blade screwdriver into the slots near
the terminals and pull out the lead wires.
(Cord) (Cord)
White
Fig. 10 Wiring of speed control switch
Yellow (Noise suppressor)
White
White
(Noise suppressor)
(Stator)
(Stator)
8-5. Insulation Tests
On completion of reassembly after 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 ( and 110 V for U.K. products )
AC 2,500 V/1 minute, with no abnormalities •••••••• 110 V --- 127 V (except for U.K. products)
8-6. No-load Current Values
After no-load operation for 30 minutes, the no-load current value should be as follows
Current (A) max.
Voltage (V) 110
2.5
115 120 220 230 240
2.5 2.5 1.2 1.2 1.1

--- 14 ---
9. STANDARD REPAIR TIME (UNIT) SCHEDULES
MODEL 10 20 30 40 50 60 min.
Fixed Variable
W 6VB2 Work Flow
Speed control
switch
Cord Armor
Cord
Carbon Brush
x 2
Sub Stopper(B)
Locator (A)
Lock Sleeve (A)
O-Ring (S-28)
Fringer (A)
O-Ring (F)
Armature
Ball Bearing
(608VV) x 2
Inner Cover
Ass'y
Housing.Handle
Cover Set
Stator
General Assembly
W 8VB
Spring
Gear Ass'y
Gear Shaft
Ball Bearing
(608VV) x 2
Second Pinion
Ass'y
First Gear
Gear Cover
Ass'y
Set Ring
Socket (B)
Ass'y
Steel Ball
D3.175

--- 15 ---
Assembly Diagram for W 6VB2

--- 16 ---
PARTS
W 6VB2
: ALTERNATIVE PARTS
ITEM
NO. CODE NO. DESCRIPTION NO.
USED
REMARKS
* 1 985-322 MAGNETIC HEX. SOCKET 5/16"X65L 1 FOR AUS,GBR,NOR,USA
* 1 985-321 MAGNETIC HEX. SOCKET 10MMX65L 1 FOR HOL,FIN,CHN
* 2 317-670
SUB STOPPER (B) FOR H3/8,H10 HEX. SOCKET 1 FOR HOL,FIN,CHN
* 2 317-671
SUB STOPPER (B) FOR H5/16 HEX. SOCKET 1 FOR AUS,GBR,NOR,USA
* 2 317-673
SUB STOPPER (C) FOR BIT HOLDER (75L) 1 FOR FRG
* 2 317-672
SUB STOPPER (A) FOR BIT HOLDER (41L) 1 FOR FRG,FRA,HOL,AUT
* 2 317-899
SUB STOPPER (D) FOR HEX. SOCKET 1 FOR FRA
3 876-031 O-RING (S-16) 1
4 317-666 LOCATOR (A) 1
5 317-665 LOCK SLEEVE (A) 1
6 873-731 O-RING (S-28) 1
7 971-468 FRINGER (A) 1
8 317-662 O-RING (F) 1
9 306-664 TAPPING SCREW (W/FLANGE) D4X40 3
10 317-661 GEAR COVER ASS’Y 1 INCLUD.8,19
11 872-573 SET RING 1
12 317-664 SOCKET (B) ASS’Y 1 INCLUD.11,13
13 959-148 STEEL BALL D3.175 (10 PCS.) 2
14 306-024 SPRING 1
15 317-771 GEAR ASS’Y 1 INCLUD.16
16 307-340 GEAR SHAFT 1
17 608-VVM BALL BEARING 608VVMC2EPS2L 1
18 987-641 WASHER (A) 1
19 608-VVM BALL BEARING 608VVMC2EPS2L 1
20 317-770 SECOND PINION ASS’Y 1 INCLUD.21
21 317-772 FIRST GEAR 1
22 317-663 WASHER 1
23 317-660 INNER COVER ASS’Y 1 INCLUD.17,18
24 608-VVM BALL BEARING 608VVMC2EPS2L 2
* 25 360-492C ARMATURE 110V 1
* 25 360-492U ARMATURE ASS’Y 115V 1 INCLUD.24
* 25 360-492E ARMATURE 220V-230V 1
* 25 360-492F ARMATURE 240V 1
26 305-398 FAN GUIDE (B) 1
27 950-515 TAPPING SCREW D4X50 2
* 28 340-436C STATOR 110V-115V 1
* 28 340-436E STATOR 220V-230V 1
* 28 340-224F STATOR 240V 1
29 317-659 HOUSING.HANDLE COVER SET 1
30 NAME PLATE 1
31 302-086 TAPPING SCREW (W/FLANGE) D4X20 (BLACK) 3
* 32 314-916 SPEED CONTROL SWITCH (2P) 100V-115V 1 FOR GBR (110V),USA
* 32 314-921 SPEED CONTROL SWITCH (2P) 220V-240V 1
* 33 317-668 INTERNAL WIRE (A) 1 FOR AUS,GBR,FRG,FRA,HOL,FIN,AUT,NOR
* 33 314-917 INTERNAL WIRE (B) (BLUE) 1 FOR USA
* 34 317-669 INTERNAL WIRE (B) 1 FOR AUS,GBR,FRG,FRA,HOL,FIN,AUT,NOR
* 34 314-918 INTERNAL WIRE (B) (BROWN) 1 FOR USA
35 999-041 CARBON BRUSH (1 PAIR) 2
36 955-203 BRUSH HOLDER 2
37 317-676 HOOK (A) 1
38 HITACHI LABEL 1
*
2
----
99

--- 17 ---
PARTS
W 6VB2
ITEM
NO. CODE NO. DESCRIPTION NO.
USED
REMARKS
39 992-635 EARTH TERMINAL 1 FOR NOISE SUPPRESSOR
40 959-140 CONNECTOR 50091 (10 PCS.) 2
41 317-667 INTERNAL WIRE 2
* 42 930-039 NOISE SUPPRESSOR 1 EXCEPT FOR USA
* 43 994-273 NOISE SUPPRESSOR 1 EXCEPT FOR USA
44 305-812 TAPPING SCREW (W/FLANGE) D4X16 (BLACK) 2
45 937-631 CORD CLIP 1
46 953-327 CORD ARMOR D8.8 1
47 981-373 TUBE (D) 2 FOR CORD
* 48 500-409Z CORD 1 (CORD ARMOR D8.8)
* 48 500-439Z CORD 1 (CORD ARMOR D8.8) FOR AUS
* 48 500-436Z CORD 1 (CORD ARMOR D8.8) FOR GBR (230V)
* 48 971-675Z CORD 1 (CORD ARMOR D8.8) FOR GBR (110V)
* 48 500-240Z CORD 1 (CORD ARMOR D8.8) FOR USA
* 48 500-456Z CORD 1 (CORD ARMOR D8.8) FOR CHN
: ALTERNATIVE PARTS
*2
----
99