Hitachi DS18DMR User manual

TECHNICAL DATA
AND
SERVICE MANUAL
CORDLESS DRIVER DRILL
DS 18DMR
DS 14DMR
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
LIST Nos. DS 18DMR: G809
DS 14DMR: G808
May 2004
D
MODELS
DS 18DMR
DS 14DMR
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
RIDGID R84015, R83015
P
MILWAIKEE 0622-24
E
DEWALT DW987, DW983
Q
BOSCH GSR18VE-2/33618,
GSR14.4VE-2/33614
B
MAKITA 6343D, 6336D
C-1
MAKITA 6347D, 6337D
C-2

Page
CONTENTS
1. PRODUCT NAME..............................................................................................................................1
2. MARKETING OBJECTIVE................................................................................................................1
3. APPLICATIONS.................................................................................................................................1
4. SELLING POINTS.............................................................................................................................2
4-1. Selling Point Descriptions...................................................................................................................3
5. SPECIFICATIONS.............................................................................................................................6
5-1. Model DS 18DMR...............................................................................................................................6
5-2. Model DS 14DMR...............................................................................................................................8
6. COMPARISONS WITH SIMILAR PRODUCTS...............................................................................10
6-1. Model DS 18DMR.............................................................................................................................10
6-2. Model DS 14DMR.............................................................................................................................12
7. WORKING PERFORMANCE PER SINGLE CHARGE...................................................................14
7-1. Model DS 18DMR.............................................................................................................................14
7-2. Model DS 14DMR.............................................................................................................................15
8. PRECAUTIONS IN SALES PROMOTION......................................................................................16
8-1. Safety Instructions............................................................................................................................16
8-2. Inherent Drawbacks of Cordless Driver Drills Requiring Particular Attention
During Sales Promotion....................................................................................................................19
9. REFERENCE MATERIALS.............................................................................................................21
9-1. Speed Control Mechanism...............................................................................................................21
10. REPAIR GUIDE.............................................................................................................................22
10-1. Precautions in Disassembly and Reassembly................................................................................22
10-2. Precaution in Disassembly and Reassembly of Battery Charger...................................................31
11. STANDARD REPAIR TIME (UNIT) SCHEDULES.........................................................................32
Assembly Diagram for DS 18DMR
Assembly Diagram for DS 14DMR

--- 1 ---
1. PRODUCT NAME
Hitachi 18 V Cordless Driver Drill, Model DS 18DMR
Hitachi 14.4 V Cordless Driver Drill, Model DS 14DMR
2. MARKETING OBJECTIVE
The Models DS 18DMR and DS 14DMR are the excellent top-end cordless driver drills developed to reinforce our
18-V and 14.4-V product lines and also to meet the market demands. The Models DS 18DMR and DS 14DMR
are of an all new cyber design. While the Model DS 18DMR is compact and lightweight (entire length 237 mm,
weight 2.5 kg), it provides the class-top maximum torque 62 N•m thanks to the optimally designed motor and
mechanical unit. The Models DS 18DMR and DS 14DMR are improved in "performance, operability and
maintainability" thanks to the adoption of the powerful motor with a large radial fan, sturdy metal chuck and metal
clutch cap, soft-touch grip widely covered with elastomer, angle-adjustable one-touch hook, etc. In addition, the
separate-type motor is the same as a driver drill with a power cord. The carbon brushes and the armature can be
replaced singly.
3. APPLICATIONS
Tightening and loosening wood screw, self-tapping screw and machine screw
Drilling into wood materials, plastic, mild steel and aluminum

--- 2 ---
22-position torque adjustable clutch
Fine torque adjustment
Max. clutch torque 10 N•m
Suitable for various works
Improved overload durability
(improved cooling efficiency)
Large radial fan
Optimally designed cooling air path
New flat battery (DS 18DMR)
Compact and stable
Interchangeable with
conventional batteries
With injection case
Externally replaceable carbon
brushes and separate-type motor
The carbon brushes and armature are
singly replaceable.
Soft-grip handle
13 mm keyless chuck is operable
with one hand and equipped with
ratcheting lock mechanism
Prevents the driver bit from loosening
Operable with one hand
No. 1 Torque: Max. torque 62 N•m (DS 18DMR)
50 N•m (DS 14DMR)
No. 1 Compact: Overall lengh 237 mm
One-touch hook
Ready for use at anytime
(angle-adjustable in 5 steps)
Mountable on either side
[Model DS 18DMR]
Side handle
All new cyber design
4. SELLING POINTS

--- 3 ---
4-1. Selling Point Descriptions
4-1-1. Compact and high power: Max. torque 62 N•m (DS 18DMR)
While the Model DS 18DMR is compact and lightweight (entire length 237 mm, weight 2.5 kg), it provides the
class-top maximum torque 62 N•m thanks to the optimum design (see Tables 1 and 2). The Models DS 18DMR
and DS 14DMR can drill large diameter holes and tighten screws effortlessly.
Fig. 1 Curves of motor temperature rise
4-1-2. Improved overload durability (improved cooling efficiency)
The Models DS 18DMR and DS 14DMR are equipped with the separate-type motor that is the same as a driver
drill with a power cord. To improve the overload durability in continuous operation, the optimally designed cooling
air path that is descended from the Model DS 12DM increases the cooling efficiency as well as the large radial fan
increases the volume of air (See Fig. 1).
Model
Max. torque [N•m]
Overall length [mm]
Overall height [mm]
Overall width [mm]
Weight [kg]
DS 18DMR
62
237
248
76
2.5
B
55
247
267
87
2.6
P
58
270
266
87
3.0
E
56
260
252
80
2.9
Q
51
254
241
90
2.6
DS 18DVB2
45
241
247
76
2.4
C-1
45
255
249
95
2.5
C-2
45
243
251
95
2.4
Table 1
Model
Max. torque [N•m]
Overall length [mm]
Overall height [mm]
Overall width [mm]
Weight [kg]
DS 14DMR
50
237
245
76
2.3
C-1
38
255
244
94
2.3
P
47
270
266
87
3.0
Q
45
254
237
79
2.4
B
51
247
260
86
2.4
DS 14DVB2
39
241
242
76
2.1
C-2
40
243
246
94
2.1
Table 2

--- 4 ---
4-1-3. 22-position torque adjustable clutch (Max. clutch torque 10 N•m)
The 22-stage clutch ensures fine torque adjustment (see Table 3). The tightening torque is selectable up to
10 N•m. The wider torque selectable range extends the range of applicable works.
4-1-4. 13 mm keyless chuck is operable with one hand and equipped with ratcheting lock mechanism
The sleeve can be turned with one hand. The driver bits can be easily replaced by holding the main unit with one
hand while turning the sleeve with the other hand. The Models DS 18DMR and DS 14DMR are also equipped
with the ratcheting lock mechanism to prevent the sleeve from loosening during operation. A simple twist until a
click is heard locks the sleeve tight.
4-1-5. 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.
4-1-6. One-touch hook
(1) The hook can be quickly slid out whenever necessary and slid in when not necessary.
(2) The hook is mountable on either side using a flat-blade screwdriver or a coin.
(3) The angle of the hook is adjustable in five steps.
* There may be difference in operation depending on the screw shapes and workpieces.
Perform a test before actual driving.
Clutch cap position
1
4
10
13
19
22
Tightening torque
2.0 0.5 N•m {20 5 kgf•cm}
3.5 0.6 N•m {35 6 kgf•cm}
5.6 0.7 N•m {56 7 kgf•cm}
6.7 0.8 N•m {67 8 kgf•cm}
8.9 0.9 N•m {89 9 kgf•cm}
10.0 1.0 N•m {100 10 kgf•cm}
Angle-adjustable in 5 steps Mountable on either side
Table 3

--- 5 ---
4-1-7. Externally replaceable carbon brushes and separate-type motor
The carbon brushes are replaceable from the outside. In addition, the armature is singly replaceable thanks to
the adoption of the separate-type motor that is the same as a driver drill with a power cord. Thus the Models
DS 18DMR and DS 14DMR are easier to maintain.
4-1-8. New flat battery
The battery is flat enough to stand the Model DS 18DMR upright stability. The conventional Hitachi 18-V batteries
are also usable.
4-1-9. Others
The Models DS 18DMR and DS 14DMR have the following features common to the previous model.
The terminal is movable according to the movement of the battery to prevent damage to the contact portion.
The contact between the housing and the battery is changed from line contact to surface contact to minimize
rattling due to wear.
Armature
Magnet
Carbon brush
Separate-type motor
[Models DS 18DMR and DS 14DMR]
Case-type motor (carbon brushes are built in)
[Conventional model]

--- 6 ---
Screwdriver Machine screw ••••••••6 mm (1/4")
Wood screw ••••••••••••8 dia. x 100 mm (#20 x 4")
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•••••••••••••••••••••• 50 mm (2") [Thickness 18 mm (11/16")]
Mount type ••••••Screw-on (UNF 1/2" --- 20)
Diameter •••••••••1.5 --- 13 mm (1/16" --- 1/2")
Low: 0 --- 400/min, High: 0 --- 1,600/min
Slip torque •••••••• 2 --- 10 N•m (20 --- 100 kgf•cm, 18 --- 87 in-lbs.) [22 stages]
Max. torque ••••••• Low: 62 N
•
m (633 kgf
•
cm, 550 in-lbs.), High: 14 N
•
m (143 kgf
•
cm, 124 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) and thermoplastic elastomer (green)
Battery ••••• Glassfiber reinforced polyamide resin (black)
Charger ••• ABS resin (black)
Sealed cylindrical nickel-cadmium storage battery
Nominal voltage ••••••••••••••• DC 18 V
Nominal life ••••••••••••••••••••• Charging/discharging: Approx. 1,000 times
Nominal capacity ••••••••••••• 2.0/2.4 Ah
Sealed cylindrical nickel-metal-hydride storage battery
Nominal voltage ••••••••••••••• DC 18 V
Nominal life ••••••••••••••••••••• Charging/discharging: Approx. 500 times
Nominal capacity ••••••••••••• 2.6/3.0 Ah
Overcharge protection system:
(1) Battery voltage detection ( 2V system) for Ni-Cd battery
Mi-MH battery temperature detection (dT/dt system) for Ni-MH battery
(2) Battery surface temperature detection (thermostat or thermistor)
(3) 120 minutes timer
Power input: 90 W
Charging time: Approx. 50 minutes [for type EB 1820L battery at 20ûC (68ûF)]
Approx. 60 minutes [for type EB 1824L/EB 1826HL battery at 20ûC (68ûF)]
Approx. 70 minutes [for type EB 1830HL battery at 20ûC (68ûF)]
Operable ambient temperature range: 0 ûC --- 40ûC (32ûF --- 104ûF)
The maximum allowable temperature of the type EB 1820L or EB 1824L battery is 60ûC
(140ûF) and the type EB 1826HL or EB 1830HL battery is 45ûC (113ûF).
Indication method of battery charging function:
5. SPECIFICATIONS
5-1. Model DS 18DMR
Capacity
Keyless chuck
(13VLRK-N)
Rotation speed (No-load)
Type of motor
Torque
Type of switch
Handle configuration
Enclosure
Battery
(Type EB 1820L/
EB 1824L)
Charger
(Model UC 24YFA)
Battery
(Type EB 1826HL/
EB 1830HL)

--- 7 ---
Overcharge protection system:
(1) Battery voltage detection ( 2V system) for Ni-Cd battery
Mi-MH battery temperature detection (dT/dt system) for Ni-MH battery
(2) Battery surface temperature detection (thermostat or thermistor)
(3) 120 minutes timer
Power input: 200 W
Charging time: 28 minutes [for type EB 1830HL battery at 20ûC (68ûF)]
Operable ambient temperature range: 0 ûC --- 40ûC (32ûF --- 104ûF)
The maximum allowable temperature of the type EB 1830HL battery is 50ûC (122ûF).
Indication method of battery charging function:
Charger
(Model UC 24YJ)
Weight
Standard
accessories
Main body unit (including battery) •••••••••••••••••••••••••••••••••••••••••••••••••••• 2.5 kg (5.5 Ibs.)
Charger unit (UC 24YFA, including cord) ••••••••••••••••••••••••••••••••••••••••• 0.6 kg (1.3 Ibs.)
Charger unit (UC 24YJ, including cord) ••••••••••••••••••••••••••••••••••••••••••• 1.0 kg (2.2 Ibs.)
DS 18DMR (2BLFK)/(2HLFK)•••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 6.7 kg (14.8 Ibs.)
DS 18DMR (3HLFK) •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 7.8 kg (17.2 Ibs.)
DS 18DMR (2HLCK) •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 7.4 kg (16.3 Ibs.)
Charger (UC 24YFA) •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• ••••••••••••••••••••••••••••• 1
Battery (EB 1820L/EB 1824L/EB 1826HL) ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 2
Phillips (plus) driver bit (No. 2) •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Side handle ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Case (injection type)••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Charger (UC 24YFA) •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• ••••••••••••••••••••••••••••• 1
Battery (EB 1826HL) ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 3
Phillips (plus) driver bit (No. 2) •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Side handle ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Case (injection type)••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Charger (UC 24YJ) ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• ••••••••••••••••••••••••••••• 1
Battery (EB 1830HL) ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 2
Phillips (plus) driver bit (No. 2) •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Side handle ••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Case (injection type)••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••• 1
Net
Gross
(2BLFK)
(2HLFK)
(3HLFK)
(2HLCK)