Hitachi DS 18DFL Manual

TECHNICAL DATA
AND
SERVICE MANUAL
CORDLESS DRIVER DRILL
DS 18DFL
DS 14DFL
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
LIST Nos. DS 18DFL: G865
DS 14DFL: G864
Apr. 2007
D
MODELS
DS 18DFL
DS 14DFL
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 BDF452
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
5-1. Model DS 18DFL ........................................................................................................................... 4
5-2. Model DS 14DFL ........................................................................................................................... 5
6. COMPARISONS WITH SIMILAR PRODUCTS ............................................................................. 6
6-1. Model DS 18DFL ........................................................................................................................... 6
6-2. Model DS 14DFL ........................................................................................................................... 7
7. WORKING PERFORMANCE PER SINGLE CHARGE ................................................................. 8
7-1. Model DS 18DFL ........................................................................................................................... 8
7-2. Model DS 14DFL ........................................................................................................................... 9
8. PRECAUTIONS IN SALES PROMOTION .................................................................................. 10
8-1. Safety Instructions ....................................................................................................................... 10
8-2. Inherent Drawbacks of Cordless Driver Drills Requiring Particular Attention
During Sales Promotion ............................................................................................................... 13
9. REPAIR GUIDE ........................................................................................................................... 15
9-1. Precautions in Disassembly and Reassembly ............................................................................. 15
9-2. Precautions in Disassembly and Reassembly of Battery Charger .............................................. 22
10. STANDARD REPAIR TIME (UNIT) SCHEDULES .................................................................... 23
Assembly Diagram for DS 18DFL
Assembly Diagram for DS 14DFL

--- 1 ---
1. PRODUCT NAME
Hitachi 18 V Cordless Driver Drill, Model DS 18DFL
Hitachi 14.4 V Cordless Driver Drill, Model DS 14DFL
2. MARKETING OBJECTIVE
The new cordless driver drills Models DS 18DFL and DS 14DFL are developed based on the current Models
DS 18DVF3 and DS 14DVF3 for the purpose of light-duty work, and equipped with the 1.5 Ah lithium-ion batteries
Types BCL 1815 and BCL 1415 respectively. They are more compact, lightweight and inexpensive than the
current models. Each of these new models has a spare battery and a charger Type UC 18YGL (for lithium-ion
battery only) or UC 18YRL as standard accessories.
3. APPLICATIONS
Tightening and loosening wood screws, self-tapping screws and machine screws
Drilling into wood, plastic, mild steel and aluminum materials
Powerful, compact and lightweight
Max. torque 45 N•m (400 in-lbs.) (DS 18DFL) 34 N•m (300 in-lbs.) (DS 14DFL)
Overall height 224 mm (8-13/16") (DS 18DFL) 221 mm (8-11/16") (DS 14DFL)
Weight 1.7 kg (3.7 lbs.) (DS 18DFL) 1.6 kg (3.5 lbs.) (DS 14DFL)
[Model DS 18DFL]
4. SELLING POINTS
Soft grip handle
For increased comfort
22-stage adjustable clutch
For precise torque setting
13 mm keyless chuck (DS 18DFL)
10 mm keyless chuck (DS 14DFL)
For tool-less bit changes
New lithium-ion battery with
protection circuit
Compact, lightweight and good
stability design
Interchangeable with conventional
batteries
Overdischarge, overcharge and
overheat protection circuits are
equipped.

--- 2 ---
DS 14DFL
(BCL1415)
4-1. Selling Point Descriptions
4-1-1. Compact and lightweight
The Models DS 18DFL and DS 14DFL are more compact and lightweight than the current Models DS 18DVF3
and DS 14DVF3. (Table 1)
4-1-2. 22-stage adjustable clutch (Max. clutch torque 5.9 N•m)
The torque can be set finely thanks to the adoption of the 22 clutch positions to improve the operability (see
Table 1).
* There may be difference in operation depending on the screw shapes and workpieces.
Perform a test before actual driving.
Clutch dial position
1
4
10
13
19
22
Tightening torque
1.0 0.5 N•m {10 5 kgf•cm}
1.7 0.6 N•m {17 6 kgf•cm}
3.1 0.7 N•m {31 7 kgf•cm}
3.8 0.8 N•m {38 8 kgf•cm}
5.2 0.9 N•m {53 9 kgf•cm}
5.9 1.0 N•m {60 10 kgf•cm}
Table 2
The Model DS 14DFL is 0.2 kg lighter and 8 mm shorter than the current Model DS 14DVF3.
The Model DS 18DFL is 0.3 kg lighter and 9 mm shorter than the current Model DS 18DVF3.
Table 1
Weight (kg)
Overall height (mm)
DS 18DFL
(BCL1815)
DS 14DVF3
(EB1414S)
DS 18DVF3
(EB1814SL)
1.6
221
2.0
233
1.7
224
1.8
229
Model name
(Standard battery model)
4-1-3. Soft grip handle
The handle is widely covered with soft-touch elastomer (rubber-like soft resin). It is slip-resistant and securely fits
in the palm of a hand even if the gripping hand sweats.

--- 3 ---
4-1-4. New lithium-ion battery (BCL 1815, BCL 1415)
The new 1.5 Ah lithium-ion batteries Types BCL 1815 and BCL 1415 are developed for light-duty work. Each of
them is equipped with the overdischarge protection circuit, overload protection circuit, overheat protection circuit
and voltage monitoring circuit for each cell to prevent reduction of the battery life due to overdischarge (overuse)
or overcharge (excessive charging).
Each of the Types BCL 1815 and BCL 1415 lithium-ion batteries is equipped with a protective function that
automatically stops output to extend the battery life. The motor may stop automatically in any of the following
cases , and even if the switch is depressed continuously during operation. This is because the protective
function is activated. It is not faulty.
The motor automatically stops when the remaining battery level is low (Type BCL 1815: when the battery
voltage is decreased to about 10 V / Type BCL 1415: when the battery voltage is decreased to about 8 V).
Charge the battery immediately in such case.
The motor may stop if the Model DS 18DFL/DS 14DFL is overloaded. In such case, release the switch and
eliminate the cause of the overload problem. Then the Model DS 18DFL/DS 14DFL is operable.
The battery output is stopped automatically if the battery is overheated during heavy-duty work. In such case,
remove the battery from the tool and cool it down. Then the battery is reusable.
<Nominal life of the battery (charging/discharging frequency)>
Each of the Types BCL 1815 and BCL 1415 lithium-ion batteries can be charged/discharged up to about 600
times. Note that these batteries are intended for light-duty work. If they are used for heavy-duty work (in
combination with cordless power tools such as circular saws, jig saws, saber saws, disk grinders and blowers)
continuously, the battery life may be shortened drastically.
<Overheat protection circuit>
Unlike the conventional 3.0 Ah lithium-ion batteries Types BCL 1830 and BCL 1430, the Types BCL 1815 and
BCL 1415 lithium-ion batteries are greatly influenced by temperature rise. To cope with this problem, each battery
has a thermal protector to stop the output automatically when the battery temperature is excessively high. During
normal operation, the output is not stopped by the protective function due to temperature rise in the battery.
However, the protective function may be activated and the output may be stopped before the battery runs down if
the battery is used outdoors in summer or used at high temperatures or if the high-temperature battery is used. If
the thermal protector is activated, remove the battery from the tool and cool it completely in a well-ventilated
place. The operational temperature of the thermal protector is 80 5ûC and the recovery temperature range is
from 46ûC to 68ûC. It takes about 30 minutes from when the protective function is activated till when the battery is
cooled down and reusable at a temperature of 20ûC. Note that such period depends on the use environment.
Precautions for use of the Types BCL 1815 and BCL 1415 lithium-ion batteries
1
2
3
1
2
3

--- 4 ---
Screwdriver Machine screw ••••••••6 mm (1/4")
Wood screw ••••••••••••6 dia. x 75 mm (#14 x 3")
Drill Metal ••••••Mild steel 13 mm (1/2") [Thickness 1.6 mm (1/16")]
Aluminum 13 mm (1/2") [Thickness 1.6 mm (1/16")]
Wood•••••••••••••••••••••• 36 mm (1-27/64") [Thickness 18 mm (11/16")]
Mount type ••••••Screw-on (UNF 1/2" --- 20)
Diameter •••••••••2 --- 13 mm (5/64" --- 1/2")
Low: 0 --- 400/min, High: 0 --- 1,200/min
Slip torque •••••••• 1 --- 5.9 N•m (10 --- 60 kgf•cm, 9 --- 52 in-lbs.) [22 stages]
Max. torque
•••••••
Low: 45 N
•
m (459 kgf
•
cm, 400 in-lbs.), High: 11 N
•
m (112 kgf
•
cm, 97 in-lbs.)
Fan cooled DC magnet motor
Trigger switch with pushing button for forward and reverse rotation changeover (with brake)
T-type (with soft-grip handle)
Body •••••••• Glassfiber reinforced polycarbonate resin (black)
Thermoplastic elastomer (green for Europe, gold for the U.S.A.)
Battery ••••• Glassfiber reinforced polyamide resin (black)
Charger ••• ABS resin (black)
Sealed cylindrical lithium-ion storage battery
Nominal voltage ••••••••••••••• DC 18 V
Nominal life ••••••••••••••••••••• Charging/discharging: Approx. 600 times
Nominal capacity ••••••••••••• 1.5 Ah
5. SPECIFICATIONS
5-1. Model DS 18DFL
Capacity
Keyless chuck
(13VLRK-N)
Rotation speed (No-load)
Type of motor
Torque
Type of switch
Handle configuration
Enclosure
Battery
(Type BCL 1815)
Charger
(Model UC 18YGL
or UC 18YRL)
Weight Net
Gross
Main body unit (including battery) •••••••••••••••••••••••••••••••••••••••••••••••••••••• 1.7 kg (3.7 Ibs.)
Charger unit (UC 18YGL or UC 18YRL, including cord) ••••••••••••••••••••••• 0.6 kg (1.3 Ibs.)
DS 18DFL (2LGK) ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 4.2 kg (9.2 Ibs.)
Charger (UC 18YGL or UC 18YRL) ••••••••••••••••••••••••••••••••••••••••• ••••••••••••••••••••••••••• 1
Battery (BCL 1815) •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 2
Phillips (plus) driver bit (No. 2) •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Case •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Standard
accessories
(2LGK)
Overcharge protection system:
(1) Stop current detection
(2) Battery voltage detection (- V system) (UC 18YRL)
Battery temperature detection (dT/dt system) (UC 18YRL)
(3) Battery surface temperature detection (thermostat or thermistor)
(4) 120-minute timer
Power input: UC 18YGL; 75 W, UC 18YRL; 95 W
Charging time: Approx. 30 minutes (UC 18YGL), 20 minutes (UC 18YRL)
[for Type BCL 1815 battery at 20 ûC (68 ûF)]
Operable ambient temperature range: 0 ûC to 40 ûC (32 ûF to 104 ûF)
The maximum allowable temperature of the Type BCL 1815 battery is 50 ûC (122 ûF)
Indication method of battery charging function
NOTE: The Model UC 18YRL cools the coverheated battery by the cooling fan during the standby mode.

--- 5 ---
Screwdriver Machine screw ••••••••6 mm (1/4")
Wood screw ••••••••••••6 dia. x 75 mm (#14 x 3")
Drill Metal ••••••Mild steel 12 mm (15/32") [Thickness 1.6 mm (1/16")]
Aluminum 15 mm (19/32") [Thickness 1.6 mm (1/16")]
Wood•••••••••••••••••••••• 30 mm (1-3/16") [Thickness 18 mm (11/16")]
Mount type ••••••Screw-on (UNF 1/2" --- 20)
Diameter •••••••••0.8 --- 10 mm (1/32" --- 3/8")
Low: 0 --- 400/min, High: 0 --- 1,200/min
Slip torque •••••••• 1 --- 5.9 N•m (10 --- 60 kgf•cm, 9 --- 52 in-lbs.) [22 stages]
Max. torque
•••••••
Low: 34 N
•
m (347 kgf
•
cm, 300 in-lbs.), High: 8 N
•
m (82 kgf
•
cm, 71 in-lbs.)
Fan cooled DC magnet motor
Trigger switch with pushing button for forward and reverse rotation changeover (with brake)
T-type (with soft-grip handle)
Body •••••••• Glassfiber reinforced polycarbonate resin (black)
Thermoplastic elastomer (green for Europe, gold for the U.S.A.)
Battery ••••• Glassfiber reinforced polyamide resin (black)
Charger ••• ABS resin (black)
Sealed cylindrical lithium-ion storage battery
Nominal voltage ••••••••••••••• DC 14.4 V
Nominal life ••••••••••••••••••••• Charging/discharging: Approx. 600 times
Nominal capacity ••••••••••••• 1.5 Ah
Capacity
Keyless chuck
(10VLRF-N)
Rotation speed (No-load)
Type of motor
Torque
Type of switch
Handle configuration
Enclosure
Battery
(Type BCL 1415)
Charger
(Model UC 18YGL
or UC 18YRL)
Weight Net
Gross
Main body unit (including battery) •••••••••••••••••••••••••••••••••••••••••••••••••••••• 1.6 kg (3.5 Ibs.)
Charger unit (UC 18YGL or UC 18YRL, including cord) ••••••••••••••••••••••• 0.6 kg (1.3 Ibs.)
DS 14DFL (2LGK) ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 4.1 kg (9.0 Ibs.)
Charger (UC 18YGL or UC 18YRL) ••••••••••••••••••••••••••••••••••••••••• ••••••••••••••••••••••••••• 1
Battery (BCL 1415) •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 2
Phillips (plus) driver bit (No. 2) •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Case •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Standard
accessories
(2LGK)
Overcharge protection system:
(1) Stop current detection
(2) Battery voltage detection (- V system) (UC 18YRL)
Battery temperature detection (dT/dt system) (UC 18YRL)
(3) Battery surface temperature detection (thermostat or thermistor)
(4) 120-minute timer
Power input: UC 18YGL; 75 W, UC 18YRL; 95 W
Charging time: Approx. 30 minutes (UC 18YGL), 20 minutes (UC 18YRL)
[for Type BCL 1415 battery at 20 ûC (68 ûF)]
Operable ambient temperature range: 0 ûC to 40 ûC (32 ûF to 104 ûF)
The maximum allowable temperature of the type BCL 1415 battery is 50 ûC (122 ûF)
Indication method of battery charging function
NOTE: The Model UC 18YRL cools the coverheated battery by the cooling fan during the standby mode.
5-2. Model DS 14DFL

--- 6 ---
Soft-grip handle
6. COMPARISONS WITH SIMILAR PRODUCTS
6-1. Model DS 18DFL
Remarks* •••••••• Charging time varies depending on the type of charger to be used.
203 mm (8")
450 in-lbs.
(518 kgf•cm)
Reversing switch Push-button Push-button Push-button
Maker
Model
Max. capacity
Battery
Screw
driving
Machine screw
Wood screw
Mild steel
Aluminum
Soft wood
Drilling
Nominal capacity
Nominal voltage
Charging time*
Weight
HITACHI
DS 18DFL
6 mm (1/4")
6 mm dia. x 75 mm
(#14 x 3")
13 mm (1/2")
13 mm (1/2")
36 mm (1-27/64")
1.5 Ah
18 V
30 min. (UC 18YGL)
20 min. (UC 18YRL)
220 mm (8-21/32")
224 mm (8-13/16")
1.7 kg (3.7 lbs.)
6 mm (1/4")
13 mm (1/2")
13 mm (1/2")
38 mm (1-1/2")
1.4/2.0 Ah
18 V
30/50 min.
(UC 18YG)
220 mm (8-21/32")
233 mm (9-11/64")
2.0 kg (4.4 lbs.)
C
6 mm (1/4")
10 mm dia. x 89 mm
(3/8" x 3-1/2")
13 mm (1/2")
Not indicated
38 mm (1-1/2")
1.5 Ah
18 V
15 min.
232 mm (9-9/64")
1.6 kg (3.5 lbs.)
DS 18DVF3
Slip torque
Max. torque
1.0 --- 5.9 N•m
(10 --- 60 kgf•cm)
(9 --- 52 in-lbs.)
[22 positions]
45 N•m
(459 kgf•cm)
(400 in-lbs.)
55 N•m
(561 kgf•cm)
(490 in-lbs.)
45 N•m
(459 kgf•cm)
(400 in-lbs.)
Not indicated
Rotation
speed
Low
High
0 --- 400/min
0 --- 1,200/min
0 --- 400/min
0 --- 1,200/min
0 --- 400/min
0 --- 1,500/min
Drill chuck Type
Capacity
Double sleeve
13 mm (1/2")
Double sleeve
13 mm (1/2")
Double sleeve
13 mm (1/2")
Max. torque (hard)
(actually measured value)
Switch
Type
Feedback circuit
Variable speed
Equipped
Variable speed
Equipped
Variable speed
Equipped
Electric brake Equipped Equipped Equipped
Automatic spindle lock None None Equipped
Belt hook
Equipped
Equipped Equipped
Handle shape T-type
Equipped Equipped
Strap Equipped
(Except for the U.S.A.)
Equipped None
Dimensions
Overall length
Overall height
Overall width 76 mm (3") 76 mm (3")
8 mm dia. x 75 mm
(#20 x 3")
78 mm (3-5/64")
None
T-type T-type
57 N•m
(585 kgf•cm)
(508 in-lbs.)
58 N•m
(592 kgf•cm)
(516 in-lbs.)
1.0 --- 5.9 N•m
(10 --- 60 kgf•cm)
(9 --- 52 in-lbs.)
[22 positions]

--- 7 ---
Soft-grip handle
6-2. Model DS 14DFL
Remarks* •••••••• Charging time varies depending on the type of charger to be used.
Reversing switch Push-button Push-button
Maker
Model
Max. capacity
Battery
Screw
driving
Machine screw
Wood screw
Mild steel
Aluminum
Soft wood
Drilling
Nominal capacity
Nominal voltage
Charging time*
Weight
HITACHI
DS 14DFL
6 mm (1/4")
6 mm dia. x 75 mm
(#14 x 3")
12 mm (15/32")
15 mm (19/32")
30 mm (1-3/16")
1.5 Ah
14.4 V
30 min. (UC 18YGL)
20 min. (UC 18YRL)
210 mm (8-17/64")
221 mm (8-11/16")
1.6 kg (3.5 lbs.)
6 mm (1/4")
12 mm (15/32")
15 mm (19/32")
30 mm (1-3/16")
1.4 Ah
14.4 V
30 min.
(UC 18YG)
210 mm (8-17/64")
229 mm (9")
1.8 kg (4.0 lbs.)
DS 14DVF3
Slip torque
Max. torque
1 --- 5.9 N•m
(10 --- 60 kgf•cm)
(9 --- 52 in-lbs.)
[22 positions]
34 N•m
(347 kgf•cm)
(300 in-lbs.)
49 N•m
(500 kgf•cm)
(431 in-lbs.)
34 N•m
(347 kgf•cm)
(300 in-lbs.)
Rotation
speed
Low
High
0 --- 400/min
0 --- 1,200/min
0 --- 400/min
0 --- 1,200/min
Drill chuck Type
Capacity
Double sleeve
10 mm (3/8")
Double sleeve
10 mm (3/8")
Max. torque (hard)
(actually measured value)
Switch
Type
Feedback circuit
Variable speed
Equipped
Variable speed
Equipped
Electric brake Equipped Equipped
Automatic spindle lock None None
Belt hook
Equipped
Equipped Equipped
Handle shape T-type
Equipped
Strap Equipped
(Except for the U.S.A.)
Equipped
Dimensions
Overall length
Overall height
Overall width 76 mm (3") 76 mm (3")
6.2 mm dia. x 63 mm
(#14 x 2-1/2")
T-type
54 N•m
(546 kgf•cm)
(475 in-lbs.)
1 --- 5.9 N•m
(10 --- 60 kgf•cm)
(9 --- 52 in-lbs.)
[22 positions]

--- 8 ---
Type of work Maker Model
Working capacity (*1) Driling
speed
(sec./pc.)
050
*500
100
*750
150
*250
200
< High speed >
< Low speed >
*1000
DS 18DFL
HITACHI
C
DS 18DVF3
4.4
4.7
4.9
< Low speed >
< Low speed >
DS 18DFL
HITACHI
C
DS 18DVF3
DS 18DFL
HITACHI
C
DS 18DVF3
DS 18DFL
HITACHI
C
DS 18DVF3
6.0
11
4.1
4.6
5.1
6.0
0.6
0.9
0.4
0
73
80
77
73
65
90
87
60
72
*542
*650
*487
7. WORKING PERFORMANCE PER SINGLE CHARGE
7-1. Model DS 18DFL
Drilling and fastening performance comparison per charge
Remark*: Number of machine screws fastened per charge
Remark*1: Number of holes or fasteners per charge
The above table shows an example of test data. The batteries used in this test are as follows:
Model DS 18DFL: 1.5 Ah
Model DS 18DVF3: 1.4 Ah
C: 1.5 Ah
As actually measured values listed in the above table may vary depending on sharpness of the drill bit, workpiece hardness (particularly in
wood materials), moisture content of wood, charging condition, operator skill, etc.
This data should be used as a comparative guide only.

--- 9 ---
Type of work Maker Model
Working capacity (*1) Driling
speed
(sec./pc.)
050
*500
100
*750
150
*250
200
< High speed >
< Low speed >
*1000
DS 14DFL
HITACHI
DS 14DVF3
3.3
4.4
< Low speed >
< Low speed >
0
DS 14DFL
HITACHI
DS 14DVF3
DS 14DFL
HITACHI
DS 14DVF3
DS 14DFL
HITACHI
DS 14DVF3
130
156
60
55
80
60
*610
*857
13.5
12
5.3
4.4
0.5
1.0
Remark*: Number of machine screws fastened per charge
Remark*1: Number of holes or fasteners per charge
The above table shows an example of test data. The batteries used in this test are as follows:
Model DS 14DFL: 1.5 Ah
Model DS 14DVF3: 1.4 Ah
As actually measured values listed in the above table may vary depending on sharpness of the drill bit, workpiece hardness (particularly in
wood materials), moisture content of wood, charging condition, operator skill, etc.
This data should be used as a comparative guide only.
7-2. Model DS 14DFL
Drilling and fastening performance comparison per charge

--- 10 ---
8. PRECAUTIONS IN SALES PROMOTION
8-1. Safety Instructions
In the interest of promoting the safest and most efficient use of the Models DS 18DFL and DS 14DFL Cordless
Driver Drills 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 for use of the
cordless tools which are different from those of ordinary electric power tools.
(1) Before use, ensure that the battery is fully charged.
New batteries are not fully charged. Even if the batteries were fully charged at the factory, long periods of
inactivity, such as during shipping, cause the storage battery to lose its charge. Customers must be instructed
to fully charge the battery prior to use.
(2) 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.
(3) Do not use any voltage increasing equipment (transformer etc.) between the power source and the Charger.
If the Charger is used with voltage higher than that indicated on the unit, it will not function properly.
(4) Conduct battery charging at an ambient temperature range of 0 ûC --- 50 ûC (32 ûF --- 122 ûF).
Special temperature sensitive devices are employed in the Charger to permit rapid charging. Ensure that
customers are instructed to use the Charger at the indicated ambient temperature range. At temperature
under 0 ûC (32 ûF) the thermostat will not function properly, and the storage battery may be overcharged.
At temperature over 40 ûC (104 ûF), the storage battery cannot be sufficiently charged. The optimum
temperature range is 20 ûC --- 25 ûC (68 ûF --- 77 ûF).
(5) The battery charger should not be used continuously.
At high ambient temperature, 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.
(6) Do not insert foreign objects into the air vents on 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.

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CAUTION
• Read thoroughly HANDLING INSTRUCTIONS before use.
• Do not disassemble nor throw into fire.
CAUTION
• For safe operation, see Instruction Manual.
• Risk of fire, burn or explosion.
For use only with UC 18YGL, UC 18YRL charger.
Do not crush, disassemble, or dispose of in fire.
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, I'utilisateur doit lire
et bien comprendre le mode d'emploi.
WARNING
• Risk of fire, burn or explosion. For use only with BCL 1815
or EBM 1830 battery.
WARNING
• Risk of fire, burn or explosion. For use only with BCL 1415
or BCL 1430 battery.
(2) The following cautions are listed on the Name Plate attached to each Storage Battery.
For Europe and China
(7) Do not attempt to disassemble the Storage Battery or the Charger.
Special devices, such as a thermostat, are built into the storage battery and 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.
(8) Disposal of the Storage Batteries
Ensure that all customers understand that the Storage Batteries 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 batteries may explode.
B. Caution plates
(1) The following cautions are listed on the Name Plate attached to the main body of each tool.
For the U.S.A. and Canada

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For safe operation, see instruction manual. Charge HITACHI
rechargeable batteries types BCL14, BCL18 and EBM18 series.
Other types of batteries may burst causing personal injury and damage.
Charge between 32ûF and 104ûF. Rest 15 minutes between the charging of
batteries. Indoor use only. Replace defective cord immediately.
(3) The following caution is listed on the Name Plate to the Model UC 18YGL Charger.
For the U.S.A. and Canada
CAUTION
For safe operation, see instruction manual. Charge HITACHI
rechargeable batteries types EB7, EB9, EB12, EB14, EB18, BCL14,
BCL18 and EBM18 series. Other types of batteries may burst causing personal
injury and damage. Charge between 32ûF and 104ûF. Rest 15 minutes
between the charging of batteries. Indoor use only. Replace defective cord
immediately.
(4) The following caution is listed on the Name Plate to the Model UC 18YRL Charger.
For the U.S.A. and Canada
CAUTION

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8-2. Inherent Drawbacks of Cordless Driver Drills Requiring Particular Attention During Sales Promotion
The cordless driver 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 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 Driver Drill for comparatively light work.
Because they are battery driven, the output of the motor in cordless driver drills is rather low in comparison
with conventional electric power tools. Accordingly, they are not suitable for continuous drilling of many holes
in succession, or for drilling into particularly hard materials which creates a heavy load. Salespersons should
recommend conventional electric power tools 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 done 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 insert a foreign object into body vent holes.
The body of this tool has vent holes for improving the cooling efficiency. As a fan is built into the motor, a
foreign object inserted through a vent hole may cause a failure. Please instruct customers to never insert a
foreign object into the vent hole.
(4) Avoid "Locking" of the motor.
Locking of the motor will cause an overload current that could result in burning 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 to reverse rotation, or by manually turning the main body of the tool.)
(5) Variation in amount of work possible per charge
Although the nominal chargeable capacity of the storage batteries used with the Models DS 18DFL and
DS 14DFL is 1.5 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.

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(6) Precautions in the use of HSS Drill Bits
For example, although the Model DS 18DFL is designed for drilling capacities of 36 mm (1-27/64") in wood,
and 13 mm (1/2") in aluminum and mild steel, this capability is not as efficient as conventional electric power
tools. In particular, when drilling through aluminum material with a 13 mm (1/2") drill bit, the drill tends to
become locked when the drill bit penetrates through the material. For this reason, the customer should be
cautioned to reduce the thrust on the main body of the drill when 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 of the motor and/or
rapid deterioration of the battery.
(7) Securely tighten the sleeve of the keyless chuck.
The keyless chuck may slip during operation if the shape of the drill bit shank is cylindrical or depending on the
surface conditions, materials, etc. Please instruct the customers to retighten the keyless chuck more securely
if the keyless chuck slips during operation. The holding force of the keyless chuck is increased as the
tightening force of the keyless chuck is increased.
(8) Avoid continuous use.
Although the Models DS 18DFL and DS 14DFL can bear continuous operation under certain conditions,
operating conditions are different depending on material of workpiece and sharpness of the drill bit in use.
Please instruct the customers to avoid continuous use of the Models DS 18DFL and DS 14DFL and take a
pause about 15 minutes after a single charge operation as a guide.

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9. REPAIR GUIDE
Be sure to remove the storage batteries from the main body before servicing. Inadvertent triggering of the switch
with the storage battery connected will result in danger of accidental turning of the motor.
9-1. 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 for the Model DS 18DFL, and the <Bold> numbers to those in the Parts List and the exploded
assembly diagram for the Model DS 14DFL.
9-1-1. Disassembly
(1) Removal of the Hook Ass'y [37] <38>
Remove Special Screw (A) M5 [42] <43> with a flat-blade screwdriver or a coin. Remove the Hook Ass'y
[37] <38> and the Hook Spring [41] <42>.
(2) Removal of Housing (A). (B) Set [29] <30>
First, align the drill mark " " at the Clutch Dial [4] <4> with the triangle mark at Housing (A). (B) Set [29]
<30>. Remove the eight Tapping Screws (W/Flange) D3 x 16 (Black) [26] <27> secured to the main body.
Gently open housing (A) and housing (B) while holding their battery loading sections.
(3) After housing (B) has been removed, all the internal parts, assembled or separate, can be taken out as they
are. Lift the entire contents from housing (A) while holding the Motor [25] <25> and the Clutch Dial [4] <4>.
(4) Removal of the Drill Chuck [2] <2> (See Fig. 1.)
(a) Turn the Motor [25] <25> counterclockwise (when viewed from the rear) and remove it from the Rear Case
[14] <14>. Remove the Shift Knob [35] <36> from the Shift Arm [16] <16>. Take care not to remove the
Shift Arm [16] <16> from the Rear Case [14] <14> in this operation.
(b) Attach the motor spacer (an accessory of the special repair tool J-342, Code No. 324-582) to the assembly
of the Drill Chuck [2] <2>, Clutch Dial [4] <4>, Front Case [9] <9> and Rear Case [14] <14> then mount it
in special repair tool J-342 clamped in the vise as illustrated in Fig. 1. In this operation, check that the
pinion press-fitted in the special repair tool J-342 and Planet Gear (A) Set [21] <21> are engaged properly.
(c) Secure the Slide Ring Gear [17] <17> to the Front Case [9] <9> side with the Shift Arm [16] <16>.
(d) Turn the sleeve of the Drill Chuck [2] <2> counterclockwise (when viewed from the front) to fully open the
jaws of the Drill Chuck [2] <2>. Turn the Special Screw (Left Hand) M6 x 23 [1] <1> clockwise and remove
it. (Note that the special screw is left-hand threaded.)
(e) Fit the hexagonal bar wrench M10 into the Drill Chuck [2] <2> as illustrated in Fig. 1 and remove the Drill
Chuck [2] <2> by turning the hexagonal bar wrench counterclockwise.

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(6) Disassembly of the clutch unit
(a) After pressing up the hook of Front Case [9] <9> with the small flat-blade screwdriver, the Clutch Dial [4]
<4> and the Click Spring [5] <5> can be taken out as they are. (See Fig. 2.)
(b) Turn the Nut [6] <6> counterclockwise and remove it from the Front Case [9] <9>, then remove the Spring
[7] <7> and Washer (D) [8] <8> from the Front Case [9] <9>.
NOTE: Do not remove the Front Case [9] <9>.
(7) Disassembly of the power supply unit
NOTE: Do not remove the heat sink secured to the DC-Speed Control Switch [32] <33> with a screw.
Remove the two Machine Screws (W/Sp. Washer) M4 x 6 [28] <29>, and take the Motor [25] <25> and the
Motor Spacer [24] <24> apart. Disconnect the Internal Wires [30] [31] <31> <32> from the Motor [25] <25>
with a soldering iron, then disconnect them from the DC-Speed Control Switch [32] <33> with a soldering iron
in the same manner.
Fig. 1
(5) Disassembly of the gear unit
Remove the Shift Arm [16] <16> from the Rear Case [14] <14>,
then remove the Screw Set D3 x 12 (4 pcs.) [15] <15>
connecting the Front Case [9] <9> and the Rear Case [14] <14>.
Remove Washer (A) [13] <13>, Planet Gear (C) Set (3 pcs.) [12]
<12>, Ring Gear [11] <11>, six Steel Balls D5 [10] <10> from the
Front Case [9] <9> in order. Take care not to lose the six Steel
Balls D5 [10] <10> in this operation.
Fig. 2
Hook (3 pcs.)
Drill Chuck [2] <2>
Clutch Dial [4] <4>
Front Case [9] <9>
Slide Ring Gear [17] <17>
Rear Case [14] <14>
Hexagonal bar wrench
Shift Arm [16] <16>
Vise
Special repair tool (J-342)

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9-1-2. 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) Perform wiring according to the wiring diagram (Fig. 3).
Fig. 3
(b) Pay attention to the polarity of the Motor [25] <25> when soldering Internal Wires [30] <31> and [31] <32>
to the Motor [25] <25>. The red-marked side of the Motor [25] <25> is positive. (See Fig. 4.)
(c) Apply grease (Hitachi Motor Grease No. 29, Code No. 930035 is recommended) to the pinion press-fitted
on the Motor [25] <25> shaft.
(2) Reassembly of the clutch unit
(a) Mount Washer (D) [8] <8> and the Spring [7] <7> to the Front Case [9] <9>. (See Fig. 5.)
When mounting Washer (D) [8] <8> into the Front Case [9] <9>, align the projection on the Front Case [9]
<9> with the notch of Washer (D) [8] <8>.
Fig. 4
Motor Spacer [24] <24>
Motor [25] <25>
Machine Screw
(W/Sp. Washer) M4 x 6
[28] <29>
Internal Wire (Red)
[31] <32>
Internal Wire (Black)
[30] <31>
Ferrite Core [34] <35>
Terminal Support (A) [40] <41>
Positive side Red mark
Negative side
Spacer <26>
(Model DS 14DFL)