POWER TOOLS
TECHNICAL DATA
AND
SERVICE MANUAL
CORDLESS IMPACT DRILL
DV 12DV
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
LIST No. F852
Jul. 2001
D
MODEL
DV 12DV
Notice for use
Specifications and parts are subject to change for improvement.
Refer to Hitachi Power Tool Technical News for further information.
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
DEWALT
DW912K
P
MAKITA
8412DWA
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 .......................................................................................................................... 4
6. COMPARISONS WITH SIMILAR PRODUCTS .............................................................................. 5
7. WORKING PERFORMANCE PER SINGLE CHARGE .................................................................. 6
8. PRECAUTIONS IN SALES PROMOTION ..................................................................................... 7
8-1. Safety Instructions .......................................................................................................................... 7
8-2. Inherent Drawbacks of Cordless Impact Drills Requiring Particular Attention
during Sales Promotion................................................................................................................... 9
9. REFERENCE MATERIALS ..........................................................................................................10
9-1. Speed Control Mechanism ........................................................................................................... 10
10. REPAIR GUIDE ...........................................................................................................................11
10-1. Precautions in Disassembly and Reassembly .............................................................................11
10-2. Precautions in Disassembly and Reassembly of Battery Charger ............................................. 18
11. STANDARD REPAIR TIME (UNIT) SCHEDULES...................................................................... 19
Assembly Diagram for DV 12DV
--- 1 ---
1. PRODUCT NAME
Hitachi 12 V Cordless Impact Drill, Model DV 12DV
2. MARKETING OBJECTIVE
European competitors are now preparing to have a wide selection of cordless impact drills (combination drills),
and it is expected that cordless impact drills will be the growing segment of the power tool industry.
The Model DV 12DV cordless impact drill has been newly developed as an upgraded version of the current Model
DV 10DVA. The Model DV 12DV is more powerful than the Model DV 10DVA and equipped with the T-type
handle and the 22-step clutch for easier operation as a driver drill.
3. APPLICA TIONS
Drilling into brick and concrete block
Drilling into wood, metal and plastic
Driving and loosening machine screws, wood screws and tapping screws
4. SELLING POINTS
Single-touch,
two-speed selector
Choice of three operation
modes for flexibility
Drill
Impact drill
Driver (22-step clutch)
10 mm keyless chuck with
positive lock mechanism
Variable-speed switch with brake;
electronic feedback for high efficiency
Easy-to-operate
pushbutton reverse
switch
Convenient hook
--- 2 ---
4-1. Selling Point Descriptions
4-1-1. Choice of three operation modes for flexibility
This Model can be easily switched between three modes, screwdriving, drilling and impact drilling, simply by
turning the cap dial. To use it as a screwdriver, set the cap to any position between 1 and 22, depending on the
types of screws and the material to be fastened. The clutch is then coupled to adjust the tightening force among
the corresponding 22 different levels.
In order to fasten large wood screws and drill metals, woods and plastics, align the cap drill mark
" " with the triangle mark on the main body. The clutch is then directly coupled to provide the maximum
power output. Drilling into very hard materials such as brick and concrete block can be efficiently carried out by
aligning the cap impact mark " " with the triangle mark on the main body. (See Fig. 1.)
Fig. 1
4-1-2. Variable-speed switch with brake (and electronic feedback mechanism)
The brake immediately brings the operation to a stop with a simple release of the switch lever, making the unit
most convenient for continuous screw tightening and drilling.
The variable-speed switch is able to freely control the rotation speed depending on how far the switch lever is
pulled, between 0 and 350/min. for the low speed mode and between 0 and 1,250 min. for the high speed mode.
This facilitates positional adjustment, for instance, when tightening a wood screw.
The feedback mechanism ensures a greater torque even in the lower end of the variable-speed range.
Lower torque
Cap
Higher torque
Drill mark
Impact mark
Triangle mark
--- 3 ---
4-1-3. 10 mm keyless chuck with positive lock mechanism
The handle-free keyless chuck makes replacement of bits easier. Replace the drill or driver bit simply by turning
the sleeve with one hand while holding the ring with the other. (See Fig. 2.)
The lock mechanism is provided to prevent loosening of the chuck during operation.
Fig. 2
Ring
Sleeve
Tighten
Loosen
Bit
Keyless chuck
--- 4 ---
5. SPECIFICATIONS
Main body unit (including battery)
•••••••••••••••••••••••••••••••••••••
1.9 kg (4.2 Ibs.)
Charger unit
(including cord) •••••••••••••••••••••••••••••••••••••••••••
1.4 kg (3.1 Ibs.)
Main body and standard accessories DV 12DV (SSX)
••••••
5.7 kg (12.6 Ibs.)
DV 12DV (SSK)
••••••
6.0 kg (13.2 Ibs.)
Capacity
(Low/High)
Keyless chuck
(13VLR-N)
Rotation speed (No-load)
Type of motor
Torque
Type of switch
Handle configuration
Enclosure
Battery
(
Type FEB12S
)
Charger
(Model UC 12SD)
Weight
Standard
accessories
Drilling Brick
••••••••••••••••••••••
10 mm (3/8")/10 mm (3/8") [Depth 30 mm (1-3/16")]
Metal
••••••
Mild steel
10 mm (3/8")/6.5 mm (1/4") [Thickness 1.6 mm (1/16")]
Aluminum
10 mm (3/8")/6.5 mm (1/4") [Thickness 1.6 mm (1/16")]
Wood
••••••••••••••••••••••
18 mm (23/32")/18 mm (23/32") [Thickness 18 mm (23/32")]
Screw driving Wood screw
••••••••••••
5.1 dia. x 32 mm (#11 x 1-1/4")
/4.8 dia. x 40 mm (#10 x 1-9/16")
Machine screw
••••••••
6 mm (1/4")
Slip torque
••••••••••••••
1.0 --- 5.9 N•m (10 --- 60 kgf•cm, 9 --- 52 in-lbs.)
[22 stages]
Max. torque
••••••••••••
24 N•m (245 kgf•cm, 213 in-lbs.)
DC magnet motor
Trigger switch with change lever for CW* and CCW** rotation(w/o stopper)
T-type
Body
•••••••••••
Glassfiber reinforced polycarbonate resin (green)
Battery
••••••••
ABS resin (black)
Charger
••••••
ABS resin (black)
Sealed cylindrical nickel-cadmium storage battery
DC 12 V
Charging/discharging: approximately 500 times
1.4 Ah
60 minues
(with standard accessory charger at ambient temperature of 20˚C)
Impact rate (No-load)
Kind of battery
Nominal battery
Nominal life
Nominal capacity
Charging time
Ambient charging
temperature
Overcharge prevention circuit:
A thermostat monitors the surface temperature of the battery and, on
detecting the temperature rise which occurs on completion of charging,
automatically turns off the unit to prevent the battery from overcharge.
Input capacity: 51 W
Indication method: Pilot lamp indicator of battery charging
Function: On
••••••••••••••••••••••
During charging
Off
••••••••••••••••••••••
Charging completed
10 ˚C --- 40˚C (50˚F --- 104˚F)
Charger (UC12SD)
••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
1
Battery •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Cross-recessed head (plus) driver bit (No. 2) ••••••••••••••••••••••••••••••••••••••••••••• 1
Case ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Bit set ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Torchlight •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Gross
Net
DV 12DV
(SSX)
DV 12DV
(SSK)
Charger (UC12SD)
••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
1
Battery •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 2
Cross-recessed head (plus) driver bit (No. 2) ••••••••••••••••••••••••••••••••••••••••••••• 1
Case ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Bit set ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Mount type
•••••••••••
Screw-on (UNF 1/2" --- 20)
Diameter
•••••••••••
0.8 --- 10 mm (1/32" --- 3/8")
Low: 0 --- 350/min. High: 0 --- 1,250/min.
Low: 0 --- 5,250/min. High: 0 --- 18,750/min.
CW*: Clockwise CCW**: Counterclockwise
--- 5 ---
P
10 mm (3/8")
Not indicated
0 --- 460
0 --- 1,400
32 N•m (326 kgf•cm)
(283 in-lbs.)
1.9 kg (4.2 lbs.)
25 mm (1")
13 mm (1/2")
Not indicated
0 --- 5,000
0 --- 15,400
Keyless
13 mm (1/2")
2.0 Ah
12 V
60 minutes
Equipped
Equipped
235 mm (9-1/4")
255 mm (10-3/64")
6. COMPARISONS WITH SIMILAR PRODUCTS
Maker
Model
Max. capacity
Rotation speed
(min-1)
Low
High
Max. torque
Overall length
Weight
Remarks*
••••••••
Charging time may vary depending on the type of charger to be used.
Brick
Mild steel
Soft wood
Drilling
Screw
driving
Wood screw
Machine screw
Impact rate
(min-1)
Low
High
Drill chuck
Slip torque
[22 stages]
Battery
Nominal capacity
Nominal voltage
Charging time*
Switch
Type
Capacity
Electric brake
Feedback circuit
Dimensions
Overall height
HITACHI
DV 12DV
10 mm (3/8")
6 mm (1/4")
0 --- 350
0 --- 1,250
24 N•m (245 kgf•cm)
(213 in-lbs.)
1.9 kg (4.2 lbs.)
18 mm (23/32")
10 mm (3/8")
5.1 mm dia. x
32 mm length
(#11 x 1-1/4")
0 --- 5,250
0 --- 18,750
Keyless
10 mm (3/8")
1.4 Ah
12 V
60 minutes
Equipped
Equipped
232 mm (9-9/64")
255 mm (10-3/64")
HITACHI
DV 10DVA
10 mm (3/8")
6 mm (1/4")
0 --- 350
0 --- 1,100
14 N•m (143 kgf•cm)
(124 in-lbs.)
1.9 kg (4.2 lbs.)
18 mm (23/32")
10 mm (3/8")
5.1 mm dia. x
32 mm length
(#11 x 1-1/4")
0 --- 6,300
0 --- 19,800
Keyless
10 mm (3/8")
1.3 Ah
12 V
60 minutes
Equipped
Equipped
284 mm (11-3/16")
240 mm (9-29/64")
[5 stages]
Not indicated
[15 stages]
1.0 --- 5.9 N•m
10 --- 60 kgf•cm
(9 --- 52 in-lbs.)
1.0 --- 4.9 N•m
10 --- 50 kgf•cm
(9 --- 43 in-lbs.)
C
10 mm (3/8")
Not indicated
0 --- 370
0 --- 1,200
20.5 N•m (209 kgf•cm)
(182 in-lbs.)
2.2 kg (4.9 lbs.)
24 mm (15/16")
10 mm (3/8")
6.4 mm dia. x
55 mm length
(#14 x 2-5/32")
0 --- 4,100
0 --- 12,700
Keyless
13 mm (1/2")
2.0 Ah
12 V
60 minutes
Equipped
Equipped
313 mm (12-21/64")
225 mm (8-55/64")
Not indicated
[10 stages]
--- 6 ---
7. WORKING PERFORMANCE PER SINGLE CHARGE
Task description Maker Model
Working capacity (*1)
Working
time
(sec./pc.)
*
2
250
100
*
2
750
300
*2 500
200
0.6
<High speed>
<Low speed>
<Low speed>
3.7
4.5
4.2
2.8
2.8
2.4
0.6
0.7
0.7
6.5
9.7
10.8
43
37 (26)
18 mm
(23/32")
18 mm dia.
(23/32")
Soft wood
Drill bit for wood
32 mm (1-1/4")
5.1 mm dia.
(
0.2"
)
Soft wood
Wood screw
without pilot hole
Drill mode
M6 (1/4")
12 mm (1/2")
Machine screw
<High speed>
7.5
5.5
7.7
65
T1.6 (1/16")
8.5 mm dia.
(1/4")
Mild steel
Drill bit for metal
<High speed>
30 mm (1-3/16")
10 mm dia.
(3/8")
Brick
Drill bit for brick
Vibration mode
Drill mode
Max. clutch position
DV 12DV
HITACHI
DV 10DVA
P
C
40 (43)
68 (48)
DV 10DVA
DV 12DV
HITACHI
DV 12DV
HITACHI
DV 10DVA
DV 12DV
HITACHI
DV 10DVA
DV 12DV
HITACHI
DV 10DVA
60 (65)
90 (65)
60 (45)
140 (98)
185 (130)
125 (135)
148
185 (130)
245 (170)
180 (170)
180
7.7
7.7
3.8
2.7
*2 615
*
2
445 (480)
*
2
545 (380)
*
2
440 (305)
Drill mode
P
C
P
C
P
C
P
C
The above table shows an example of test data obtained by using the battery which is standard for this tool.
Working capacity and working time may increase or decrease depending on the sharpness of the drill bit, the
condition of the material and work method.
Figures in parentheses ( ) indicate values for the 1.4 Ah battery.
Remarks *1 Number of holes or fastenings per charge
Remarks *2 Number of machine screws fastened per charge
--- 7 ---
8. PRECAUTIONS IN SALES PROMOTION
8-1. Safety Instructions
In the interest of promoting the safest and most efficient use of the Model DV 12DV Cordless Impact Drill 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 Caution Plate and Name Plate attached to each tool.
A. Handling instructions
Salespersons must be thoroughly familiar with the contents of the Handling Instructions in order to give
pertinent advice to the customer. In particular, they must have a thorough understanding of the precautions in
the use of cordless (battery charger type) electric power tools which are different from those of ordinary
electric power tools.
(1) Before use, ensure that the unit is fully charged.
New units are not fully charged. Even if the units were fully charged at the factory, long periods out of use,
such as during shipping, cause the storage battery to lose its charge.
The customers must be instructed to fully charge the unit prior to use.
(2) When charging storage batteries, use only the exclusive Model UC 12SD charger provided with the tool.
Because of the designed rapid-charging feature (about one hour), use of other battery chargers is hazardous.
(3) Connect the charger to an AC power outlet only.
Use of any other power source (DC outlet, fuel powered generator, etc.) will cause the charger to overheat and
burn out.
(4) Do not use any voltage increasing equipment (transformer, etc.) between the power source and the charger.
If the charger is used with voltage over and above that indicated on the unit, it will not function properly.
(5) Conduct battery charging at an ambient temperature range of 10 ˚C --- 40 ˚C (50 ˚F --- 104 ˚F).
Special temperature sensitive devices are employed in the charger to permit rapid charging. Ensure that the
customer is instructed to use the charger at the indicated ambient temperature range. At temperatures under
10 ˚C (50 ˚F), the thermostat will not function properly, and the storage battery may be overcharged.
At temperatures over 40 ˚C (104 ˚F), the storage battery cannot be sufficiently charged. The optimum
temperature range is 20 ˚C --- 25 ˚C (68 ˚F --- 77 ˚F).
(6) The battery charger should not be used continuously.
At high ambient temperatures, if over three storage batteries are charged in succession, the temperature of
the coils on the transformer will rise and there is a chance that the temperature fuse inserted in the interior of
the transformer will inadvertently melt. After charging one battery, please wait about 15 minutes before
charging the next battery.
(7) Do not insert foreign objects into the air vents of the charger.
The charger case is equipped with air vents to protect the internal electronic components from overheating.
Caution the customer not to allow foreign materials, such as metallic or flammable objects, to be dropped or
inserted into the air vents. This could cause electrical shock, fire, or other serious hazards.
--- 8 ---
(8) Do not attempt to disassemble the storage battery or the charger.
Special devices, such as a thermostat, are built into the storage battery and the charger to permit rapid
charging. Incorrect parts replacement and/or wiring will cause malfunctions which could result in fire or other
hazards. Instruct the customer to bring these units to an authorized service center in the event repair or
replacement is necessary.
(9) Disposal of the T ype FEB 12S Storage Battery
Ensure that all customers understand that Type FEB 12S Storage Battery should be returned to the Hitachi
power tool sales outlet or the authorized service center when they are no longer capable of being recharged or
repaired. If thrown into a fire, the battery may explode, or, if discarded indiscriminately, leakage of the
cadmium compound contained in the battery may cause environmental pollution.
B. Caution plates
(1) The following cautions are listed on the Name Plate attached to the main body of each tool. Be particularly
careful to ensure that the customer understands the necessity of locking the switch prior to bit replacement,
cleaning, inspection or transporting of the tool when not in use.
For Oceania
(2) The following cautions are listed on the Name Plate attached to each Type FEB 12S Storage Battery.
For the U.S.A. and Canada
For Europe, Asia and Oceania For the U.S.A.
12SD
--- 9 ---
8-2. Inherent Drawbacks of Cordless Impact Drills Requiring Particular Attention during Sales Promotion
The cordless impact drill offers many advantages; it can be used in places where no power source is available,
the absence of a cord allows easy use, etc. However, any cordless electric power tool has certain inherent
drawbacks. Salespersons must be thoroughly familiar with these drawbacks in order to properly advise the
customer in the most efficient use of the tool.
A. Suggestions and precautions for the efficient use of the tool
(1) Use the cordless impact drill for comparatively light-duty work.
Because it is battery driven, the output of the motor in cordless impact drill is rather low in comparison with
conventional plug-in type models. Accordingly, it is not suitable for continuous drilling of many holes in
succession, or for drilling into particularly hard materials which require a heavy load. Salespersons should
recommend conventional plug-in type models for such heavy work.
(2) Drilling of large diameter holes should be conducted at low speed.
Instruct the customer that drilling of large diameter holes or other work which requires particularly strong
torque should be attempted at low speed. Because there is less torque at high speed, attempting such work
at high speed will not improve working efficiency.
(3) Do not place any foreign substance in the vent hole of the main body.
The outer frame of this unit is provided with a vent hole for greater cooling efficiency. Since the motor has a
built-in cooling fan, a foreign substance inserted into the vent hole is likely to cause mechanical failure. Alert
your customer to never cover or block the vent hole.
(4) Use a drive force of 100 to 150 N (10 --- 15 kgf, 22 --- 33 lbs).
It would not accelerate the drilling speed of this unit to apply a strong drive force as is done with a usual AC
impact drill. It would instead damage the drill bit, resulting not only in a poorer working efficiency but also
burning out the motor.
(5) Avoid "locking" of the motor.
Locking of the motor will cause an overload current that could result in burning out of the motor and/or rapid
deterioration of the battery. Salespersons should advise the customer to immediately release the switch and
stop operation if the motor becomes locked. (A jammed drill bit can be disengaged from the workpiece
material by setting the switch for reverse rotation, or by manually turning the main body of the tool.)
(6) Variation in amount of work possible per charge
Although the nominal chargeable capacity of the storage batteries used with the Model DV 12DV is 1.4 Ah,
the actual capacity may vary within 10% of that value depending on the ambient temperature during use and
charging, and the number of times the batteries have been recharged. It should be noted that other factors
which may have a bearing on the amount of work possible per charge are the working conditions (ambient
temperature, type and moisture content of the workpiece, sharpness of the drill bit, etc.) and the operational
skill of the user.
--- 10 ---
(7) Precautions in the use of HSS drill bits
Although the Model DV 12DV is designed for drilling capacities of 18 mm (23/32") in wood, and 10 mm
(3/8") into aluminum and mild steel, its capability is not as efficient as conventional plug-in type models.
In particular when drilling through aluminum material with a 10 mm (3/8") drill bit, the drill bit tends to become
locked when the drill bit penetrates the material. For this reason, the customer should be cautioned to reduce
the pressure on the main body of the drill just before drilling completely through the material to avoid locking
the tool. Repeated locking of the drill causes excessive current flow from the batteries which not only
decreases the amount of work possible per charge, but could also result in burning out of the motor.
B. Suggestions and precautions for the efficient use of the charger and storage batteries
If the Type FEB 12S Storage Battery is exposed to direct sunlight for an extended period or if the tool has just
been operated for a long time, charging may not be possible if the temperature of a battery (type FEB 12S) is
above 40˚C (104 ˚C). In such a case, the customer should be advised to place the battery in a shaded area
with a good airflow, and allows sufficient cooling before recharging. This phenomenon is common to all
existing batteries and chargers which employ temperature sensitive overcharge protection devices. The
cooling time required before recharging can be accomplished varies from a few minutes to about 30 minutes,
depending on the load, duration of use, and ambient temperature.
9. REFERENCE MATERIALS
9-1. Speed Control Mechanism
Spindle rotation speed of the Model DV 12DV can be
controlled by simply varying the amount by which the
trigger switch is depressed. The relationship between the
amount the trigger switch is depressed (in millimeters) and
the rotation speed is illustrated in Fig. 3.
Note: The gradient and values illustrated in Fig. 3 are
intended for reference only, and will vary slightly
due to differences in the discharge condition of the
battery, the ambient temperature, and individual
speed-control element accuracy.
Fig. 3
--- 11 ---
10. REPAIR GUIDE
Be sure to remove the batteries from the main body before servicing. Inadvertent triggering of the switch with the
battery connected will result in a danger of accidental turning of the motor.
10-1. Precautions in Disassembly and Reassembly
The [Bold] numbers in the description below correspond to the item numbers in the Parts List and exploded
assembly diagram for the Model DV 12DV.
10-1-1. Disassembly
(1) Removal of the Drill Chuck 10VLR-N (W/O Chuck Wrench) [2] (See Fig. 4.)
Remove the Drill Chuck 10VLR-N (W/O Chuck Wrench) [2] of the fully assembled main body in accordance
with the following procedures.
(a) Fully open the jaws of the Drill Chuck 10VLR-N (W/O Chuck Wrench) [2], and turn the Special Screw (Left
Hand) M6 x 23 [1] clockwise and remove it. Take care that it is left-hand threaded.
(b) Fix the hexagonal bar wrench M10 into the Drill Chuck 10VLR-N (W/O Chuck Wrench) [2] as indicated in
Fig.4. Next, apply the Wrench 14 mm (special repair tool, Code No. 873929) [601] to the flat surfaces on
the spindle to hold it steady, and remove it by turning counterclockwise. If it is difficult to loosen, use a pipe
extension or similar tool.
(2) Removal of Housing (B) [36]
First, align the drill mark " " on the Cap [4] with the triangle mark on Housing (A). (B) Set [36].
Remove the seven Tapping Screws (W/Flange) D3 x 16 (Black) [32] secured to the main body. Gently open
Housing (A). (B) Set [36] while holding their battery loading sections.
(3) After Housing (B) [36] has been removed, all the internal parts, assembled or separate, can be taken out as
they are. Lift the entire contents from Housing (A) [36] while holding the Motor [31] and the Cap [4].
Hexagonal bar wrench M10
Wrench 14 mm
Drill Chuck 10VLR-N
(W/O Chuck Wrench) [2]
Flat surface
Fig. 4
--- 12 ---
(4) Disassembly of the gear unit
(a) Remove the Cap [4] from the Front Case [12]. Take care not to remove the Switch Plate [8] and the Nut
[9] from the Front Case [12] in this operation.
(b) Turn the Motor [31] counterclockwise when viewed from the rear and remove it from the Rear Case [20].
(c)
Remove the Shift Arm [22] from the Rear Case [20], and remove the Shift Knob [42] from the Shift Arm [22]
.
(d) Remove the Screw Set M3 x 12 (4 pcs.) [21] connecting the Front Case [12] and the Rear Case [20].
(e) Remove Washer (A) [19], Planet Gear (C) Set (3 pcs.) [18], Carrier [17], Ring Gear [16], Spacer Washer
[15], six Steel Balls D5 [14] and six Rollers [13] in sequence from the Front Case [12]. Take care not to
lose the six Steel Balls D5 [14] and the six Rollers [13] in this operation.
(5) Removal of the Switch Plate [8]
Turn the switch flange so as to fit the projection of the switch flange to the recess of the Switch Plate [8], then
remove the Switch Plate [8] from the Front Case [12]. (See Fig. 5.)
(7) Removal of the O-ring [6]
Pull out the Lock Washer [7] from the Cap [4] and remove the
O-ring [6]. (See Fig. 6.)
(8) Disassembly of the power supply unit
(Note) Do not remove the fin secured to the DC-speed Control
Switch [39] with a screw.
Remove the two Machine Screws (W/SP. Washers) M4 x 6 [35],
and take the Motor [31] and the Motor Spacer [30] apart.
Disconnect the Internal Wires (Black) [37] and (Red) [38] from
the Motor [31] with a soldering iron, then disconnect them from
the DC-speed Control Switch [39] with a soldering iron in the
same manner.
Fig. 5
Switch Plate [8]
Three projections of Nut [9]
Fig. 6
Lock Washer [7]
Cap [4]
O-ring [6]
Projection of switch frange
Marking of the
Rear Case [20]
Recess of
Switch Plate [8]
Projections of Front Case [12]
Switch frange
(6) Removal of the Spring [10] and the Thrust Washer [11]
Turn the Nut [9] counterclockwise and remove it from the Front Case [12], then remove the Spring [10] and
the Thrust Washer [11] from the Front Case [12].
(Note) Do not remove the Front Case [12].
--- 13 ---
10-1-2. Reassembly
Reassembly can generally be carried out as the reverse of the disassembly procedure, with some items to be
noted as follows.
(1) Reassembly of the power supply unit
(a) Mount the Ferrite Core [41], Internal Wire (Black) [37] and Internal Wire (Red) [38] as shown in Fig. 7.
Fig. 8
Motor Spacer [30] Motor [31]
Internal Wire (Red) [38]
Machine Screw
(W/SP. Washer)
M4 x 6 [35]
Internal Wire (Red) [38]
Internal
Wire (Black) [37]
Internal Wire (Black) [37]
Ferrite Core [41]
DC-speed Control Switch [39]
Terminal Support (A) [44]
Inernal Wire (Black) [37]
Motor [31] side
Wind 1 turn.
Internal Wire (Red) [38]
DC-speed Control
Switch [39] side
Ferrite Core [41]
Fig. 7
(b) Be sure to perform wiring connections as indicated in the wiring diagram. (See Fig. 8.)
--- 14 ---
(c) Pay attention to the polarity of the Motor [31] when soldering Internal Wires [37] and [38] to the Motor [31].
The red-marked side of the Motor [31] is positive. (See Fig. 9.)
(d) Apply grease (Hitachi Motor Grease No. 29, Code No. 930035 is recommended) to the pinion press-fitted
on the Motor [31] shaft.
Fig. 9
Positive side
Red marking
Negative side
[30]
[31]
(2) Reassembly of the clutch unit
Mount the Thrust Washer [11], Spring [10] and Nut [9] to the Front Case [12].
Screw the Nut [9] in the Front Case [12] about 1-3/8 turns (495˚). Mount the Switch Plate [8] aligning with the
projections of the Front Case [12] as shown in Fig. 5.
(3) Reassembly of the gear unit
(a) Apply grease (Hitachi Motor Grease No. 29, Code No. 930035) to the meshing parts of the gear.
(b) Install the parts series from the six Rollers [13] to Washer (B) [29] into the assembly reassembled in step
(2). (See Fig. 10.)
Fig. 10
[12] [13] [14] [15] [16] [17] [18]
[26] [27][25]
[20] [21]
[23]
[9] [11][10]
[28] [29][24]
Groove
[8]
[19]
(i) Note the direction of the groove when installing the Slide Ring Gear [23] so that the groove faces toward
the Motor [31].
(ii) Install Washer (B) [29] in the Rear Case [20] with the projections of Washer (B) [29] engaged with the
recesses in the Rear Case [20], and turn Washer (B) [29] clockwise until it can turn no further.
(See Fig. 11.)
--- 15 ---
Fig. 11
(c) Install the Click Spring [5] and the Cap [4] to the assembly reassembled in step (b). (See Fig. 12.)
(i) Insert the ridge and the projections of the Click Spring [5] into the holes of the Cap [4].
(ii) When the Nut [9] is screwed in the Front Case [12] about 1-3/8 turns (495˚), the three projections of the
Nut [9] and the marking of the Rear Case [20] are positioned as shown in Fig. 12. Set the narrow slit of
switch flange as shown in Fig. 12 and mount the Cap [4] aligning the ridge of the Click Spring [5] with the
three projections of the Nut [9].
Recess
Projection
[29]
Projection
Fig. 12
Click Spring [5]
Marking of the
Rear Case [20]
Holes
Ridge
Three projections of Nut [9]
Cap [4]
Wide slit of switch flange
Lock Washer [7]
Switch flange
Narrow slit of
switch flange
Narrow projections
of Cap [4]
Narrow slit of
Lock Washer [7]
Projections
Center of the flat
surface of Front
Case [12]
Front Case [12]
--- 16 ---
(d) Install the Shift Arm [22] into the assembly reassembled in step (c).
With the ridge at the Shift Arm [22] facing the Motor [31] side, first install them on the unmarked side of the
assembly reassembled in step (c). Then insert the projections on the Shift Arm [22] into the holes in the
Rear Case [20] and make sure that the projections are fitted into the grooves in the Slide Ring Gear [23]
mounted within the Rear Case [20]. (See Fig. 13.)
Fig. 13
[22]
Ridge
[22]
Hole
Groove
Mark
(e) Install the Drill Chuck 10VLR-N (W/O Chuck Wrench) [2].
Install the Drill Chuck 10VLR-N (W/O Chuck Wrench) [2] using the Wrench 14 mm (special repair tool,
Code No. 873929) [601] and secure it with the Special Screw (Left Hand) M6 x 23 [1].
(f) Install the Shift Knob [42] into the assembly reassembled in step (e).
When installing the Shift Knob [42] into the Shift Arm [22], note that the "LOW" mark on the Shift Knob [42]
faces the Motor [31] with the Shift Arm [22] engaged with the recess in the Shift Knob [42].
(g)
Install the assembly reassembled in step (1) and the assembly reassembled in step (f) together. (See Fig. 14.)
Fit the projection on the Motor Spacer [30] into the recess in the Rear Case [20] while ensuring that the
Shift Knob [42] is aligned with the positive side of the Motor [31] and turn the Motor Spacer [30] clockwise
when viewed from the rear of the Motor [31] until it can turn no further. During installation, make sure that
the pinion press-fitted onto the shaft of the Motor [31] and Planet Gear (A) Set (3 pcs.) [27] mesh properly.
Fig. 14
Projection
Recess
--- 17 ---
(4) Installation of the assembly reassembled in step (3) into Housing (A). (B) Set [36]
(a) Install the Pushing Button [40] into Housing (B) [36]. (See Fig. 15.)
(b) Install the assembly reassembled in step (3) into Housing (A) [36]. Note that the projections on the Front
Case [12] and the Motor Spacer [30] are engaged in the recesses in Housing (A) [36], and the projection
on Housing (A) [36] is engaged in the groove of the Cap [4]. (See Fig. 16.)
Fig. 15
Fig. 16
Projections
[36]
Groove
Projections
Recesses
(c) Set the assembly reassembled in step (b) to Housing (B) [36] and secure it with the seven Tapping Screws
(W/Flange) D3 x 16 (Black) [32].
(d) Verify proper operation of the Cap [4].
When the assembly procedure up to step (c) is completed, ensure that the number "1" on the Cap [4] and
the impact mark " " are in alignment with the triangle mark on Housing (A). (B) Set [36]. If the Cap [4]
turns loosely, correctly reinstall the Click Spring [5] as it is improperly installed. If the number "1" on the
Cap [4] or the impact mark " " cannot reach the triangle mark on Housing (A). (B) Set [36], correctly
reinstall the Cap [4] referring to step (3) (c), as it is improperly installed.
(5) Other precautions in reassembly
(a) When the assembly procedure is completed, make sure that the turning direction of the Drill Chuck
10VLR-N (W/O Chuck Wrench) [2] corresponds to the position of the Pushing Button [40]. When the
Pushing Button [40] is pressed from the (R)-marked side, the Drill Chuck 10VLR-N (W/O Chuck Wrench)
[2] should turn clockwise when viewed from the rear (opposite side of the Drill Chuck 10VLR-N (W/O
Chuck Wrench) [2]). Also make sure that the turning speed of the Drill Chuck 10VLR-N (W/O Chuck
Wrench) [2] switches between "HIGH" and "LOW" by switching over the Shift Knob [42]. Make sure that
the run-out of the Drill Chuck 10VLR-N (W/O Chuck Wrench) [2] holding a 9 mm dia. test bar is below 0.8
mm at a distance of 85 mm from the chuck end.
[40]
[36]
--- 18 ---
(b) The tightening torque of each screw is given below.
Special Screw (Left Hand) M6 x 23 [1] : 2.9 --- 3.9 N•m ( 30 --- 40 kgf•cm, 26.1 --- 34.8 in-lbs.)
Drill Chuck 10VLR-N (W/O Chuck Wrench)
[2] : 12.7 --- 16.7 N•m ( 130 --- 170 kgf•cm, 113 --- 148 in-lbs.)
Screw Set M3 x 12 (4 pcs.) [21] : 0.6 --- 1.0 N•m ( 6 --- 10 kgf•cm, 5.2 --- 8.7 in-lbs.)
Machine Screw
(W/SP. Washer)
M4 x 6 [35] : 1.1 --- 1.9 N•m ( 11 --- 19 kgf•cm, 9.5 --- 16.5 in-lbs.)
Tapping Screw (W/Flange) D3 x 16 [32] : 1.1 --- 1.9 N•m ( 11 --- 19 kgf•cm, 9.5 --- 16.5 in-lbs.)
10-2. Precautions in Disassembly and Reassembly of Battery Charger
Please refer to the Technical Data and Service Manual for precautions in disassembly and reassembly of the
Battery Charger UC 12SD.
--- 19 ---
11. STANDARD REPAIR TIME (UNIT) SCHEDULES
MODEL 10 20 30 40
Fixed
Variable
DV 12DV
Work Flow
Housing
(A).(B) Set
Motor
Cap
DC-speed
Control Switch
O-ring
Nut
Shift Arm
60
50
(Gear Box
Ass'y)
Front Case
Ring Gear
Carrier
First Ring
Gear
Planet Gear
(A) Set
Pinion (B)
Planet Gear
(B) Set
Pinion (C)
Slide Ring
Gear
Planet Gear
(C) Set
Rear Case
Spring
Drill Chuck
General Assembly
ELECTRIC TOOL PARTS LIST
LIST NO.
CORDLESS IMPACT DRILL
Model DV 12DV
2001• 5•10
(E1)
F852
*
ALTERNATIVE PARTS
ITEM
NO.
CODE NO.
DESCRIPTION REMARKS
NO.
USED
PARTS
DV 12DV
5 -- 01
1 311-959 SPECIAL SCREW (LEFT HAND) M6X23 1
2 310-154
DRILL CHUCK 10VLR-N (W/O CHUCK WRENCH)
1
3 319-959 GEAR BOX ASS’Y 1 INCLUD.4-30
4 319-963 CAP 1
5 319-754 CLICK SPRING 1
6 320-088 O-RING 1
7 320-089 LOCK WASHER 1
8 320-090 SWITCH PLATE 1
9 319-743 NUT 1
10 319-742 SPRING 1
11 319-741 THRUST WASHER 1
12 319-960 FRONT CASE 1
13 319-744 ROLLER 6
14 306-936 STEEL BALL D5 6
15 319-746 SPACER WASHER 1
16 319-745 RING GEAR 1
17 319-747 CARRIER 1
18 319-769 PLANET GEAR (C) SET (3 PCS.) 3
19 312-704 WASHER (A) 1
20 319-748 REAR CASE 1
21 320-087 SCREW SET M3X12 (4 PCS.) 4
22 319-753 SHIFT ARM 1
23 319-750 SLIDE RING GEAR 1
24 319-749 PINION (C) 1
25 319-768 PLANET GEAR (B) SET (3 PCS.) 3
26 319-751 PINION (B) 1
27 319-767 PLANET GEAR (A) SET (3 PCS.) 3
28 319-752 FIRST RING GEAR 1
29 312-716 WASHER (B) 1
30 316-955 MOTOR SPACER 1
31 319-966 MOTOR 1
32 313-687
TAPPING SCREW (W/FLANGE) D3X16 (BLACK)
7
* 33 NAME PLATE 1
34 318-237 BIT HOLDER 1
35 317-333 MACHINE SCREW (W/SP. WASHER) M4X6 2
36 319-965 HOUSING (A).(B) SET 1
* 37 319-759 INTERNAL WIRE (BLACK) 100L 1
* 37 320-133 INTERNAL WIRE (BLACK) 195L 1 FOR GBR,FRG,NOR,SWE,DEN
* 38 319-758 INTERNAL WIRE (RED) 130L 1
* 38 320-132 INTERNAL WIRE (RED) 185L 1 FOR GBR,FRG,NOR,SWE,DEN
39 318-245 DC-SPEED CONTROL SWITCH 1
40 319-760 PUSHING BUTTON 1
* 41 318-247 FERRITE CORE 1 FOR GBR,FRG,NOR,SWE,DEN
42 318-234 SHIFT KNOB 1
43 HITACHI LABEL 1
44 315-141 TERMINAL SUPPORT (A) 1
45 306-952 STRAP (BLACK) 1
* 46 318-241 BATTERY FEB 12S (W/ENGLISH N.P) 3
* 46 318-240 BATTERY FEB 12S (W/ENGLISH N.P) 2 FOR USA,CAN
* 46 318-239 BATTERY FEB 12S (W/ENGLISH N.P) 2 FOR NZL,SAF
* 47 320-131 CORE PROTECTOR 1 FOR GBR,FRG,NOR,SWE,DEN
*
ALTERNATIVE PARTS
STANDARD ACCESSORIES
OPTIONAL ACCESSORIES
ITEM
NO.
CODE NO.
DESCRIPTION REMARKS
NO.
USED
ITEM
NO.
CODE NO.
DESCRIPTION
REMARKS
NO.
USED
DV 12DV
501 CHARGER (MODEL UC 12SD) 1
502 318-236 + DRIVER BIT NO.2 55L 1
503 319-964 HOOK 1
504 319-967 CASE 1
505 BIT SET 1
* 506 TORCHLIGHT (MODEL UB 12D) 1
601 873-929 WRENCH 14MM 1
5 -- 01
*
ALTERNATIVE PARTS
ITEM
NO.
CODE NO.
DESCRIPTION REMARKS
NO.
USED
Printed in Japan
(010510N)
5 -- 01
DV 12DV
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