Hitachi DS 7DF Technical Data And Service Manual
POWER TOOLS
TECHNICAL DATA
AND
SERVICE MANUAL
CORDLESS DRIVER DRILL
DS 7DF
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
LIST No. F881 Mar. 2003
D
MODEL
DS 7DF
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
BOSCH
GSR7.2-1
B
Page
CONTENTS
1. PRODUCT NAME............................................................................................................................. 1
2. MARKETING OBJECTIVE ............................................................................................................... 1
3. APPLICA TIONS................................................................................................................................ 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 Driver Drills Requiring Particular Attention
During Sales Promotion .....................................................................................................................9
9. REFERENCE MATERIALS ............................................................................................................ 10
9-1. Feedback System ............................................................................................................................10
10. REPAIR GUIDE .............................................................................................................................11
10-1. Precautions in Disassembly and Reassembly............................................................................... 11
10-2. Precautions in Disassembly and Reassembly of the Battery Charger ..........................................16
11. STANDARD REPAIR TIME (UNIT) SCHEDULES........................................................................ 17
Assembly Diagram for DS 7DF
--- 1 ---
1. PRODUCT NAME
Hitachi 7.2 V Cordless Driver Drill, Model DS 7DF
2. MARKETING OBJECTIVE
The new Model DS 7DF was developed based on the well-reputed Model DN 10DSA to reinforce the 7.2-V
product line. As the Model DS 7DF is equipped with the T-type handle and the clutch, small screws can be
tightened easily (it is difficult by the Model DN 10DSA). Besides, the Model DS 7DF is equipped with the softtouch and nonskid grip handle made of elastomer (soft resin). The cooling fan incorporated in the motor greatly
enhances the cooling effect, and the variable speed switch with feedback system ensures a sufficiently large
torque even at a low speed.
3. APPLICA TIONS
Tightening and loosening wood screws, self-tapping screw and machine screw
Drilling into wood materials, plastic, mild steel and aluminum
4. SELLING POINTS
10 mm (3/8")
keyless chuck
7.2 V cassette battery
Durable fan-cooled motor
Compact and light
[Overall length: 195 mm, weight: 1.2 (EB 712S)/1.3 (FEB 7S)]
Convenient strap
Soft-touch elastomer
grip handle
Push-button type
reversing switch
Variable speed switch
with braking function
Equipped with feedback
power control
Variable torque setting
for fastener tightening
22-position adjustable
torque setting
Convenient bit holder
--- 2 ---
4-1. Selling Point Descriptions
4-1-1. Soft-touch elastomer grip handle
The Model DS 7DF is equipped with the soft-touch and nonskid grip handle made of elastomer (soft resin).
Besides, the shape of the handle is improved for comfortable gripping.
4-1-2. 22-position Adjustable Torque Setting
The torque can be set finely thanks to adoption of the 22 clutch positions to improve the operability.
Clutch dial
Maker
Model
Soft grip handle
HITACHI
DS 7DF DN 10DSA
Equipped None
B
None
DS 7DF
Previous T-type
handle
Gentle shape for
comfortable gripping
Elastomer material
(Soft resin)
* Tightening torque may be different depending on types of screws and workpieces. Instruct the customer to
check the types of screws and workpieces to be used before operation.
Guide for selecting proper tightening torque
Clutch position
1
•
4 (Indication: •)
•
7
•
10 (Indication: •)
•
13
•
16 (Indication: •)
•
19
•
22
Torque
0.49 N•m [5 kgf•cm]
0.98 N•m [10 kgf•cm]
1.47 N•m [15 kgf•cm]
1.96 N•m [20 kgf•cm]
2.45 N•m [25 kgf•cm]
2.94 N•m [30 kgf•cm]
3.43 N•m [35 kgf•cm]
3.92 N•m [40 kgf•cm]
--- 3 ---
HITACHI
DS 7DF DN 10DSA
Variable speed On-off
Equipped None
Equipped Equipped
4-1-3. Durable fan-cooled motor
The cooling fan incorporated in the motor and the air vents provided in its outer frame greatly enhance the cooling
effect, ensuring improved durability in continuous operation.
Fig. 1 Curves of motor temperature rise
Intermittent load test: 1.0 N•m {10 kgf•cm}, 20 cycles/min.
Temperature rise of the motor outer frame (K)
: Saturated (No abnormality)
X : Burnt
Cycle
4-1-4. Variable speed switch with braking function
The braking function allows the driver unit to stop rotation immediately when the trigger switch is released, which
is a convenient feature during actual working. Also, the feedback system ensures a sufficiently large torque even
in the variable speed range.
Maker
Model
Type
Feedback circuit
Electric brake
B
Variable speed
Not indicated
Equipped
4-1-5. 10 mm (3/8") keyless chuck
The keyless chuck facilitates fast and easy replacement of driver bits. Replacement can be carried out simply by
holding the ring with one hand, while turning the sleeve with the other hand.
Loosen
Sleeve
Ring
Tighten
B
--- 4 ---
5. SPECIFICATIONS
Screwdriver Machine screw
••••••••
6 mm (1/4")
Wood screw
••••••••••••
5.1 dia. x 32 mm (#11 x 1-1/4")
Drill Metal
••••••
Mild steel 10 mm (3/8") [Thickness 1.6 mm (1/16")]
Aluminum 10 mm (3/8") [Thickness 1.6 mm (1/16")]
Wood
••••••••••••••••••••••
15 mm (19/32") [Thickness 18 mm(11/16")]
Mount type
••••••
Screw-on (UNF 1/2" --- 20)
Diameter
•••••••••
0.8 --- 10 mm (1/32" --- 3/8")
0 --- 600/min
Slip torque
••••••••
5 --- 40 N•m (5 --- 40 kgf•cm, 5 --- 35 in-lbs.) [22 stages]
Max. torque
•••••••
8 N•m (82 kgf•cm (71 in-lbs.))
DC magnet motor
Trigger switch with push button for forward and reverse rotation changeover
T-type
Body
••••••••••••••••••••••
Glassfiber reinforced polycarbonate resin (green)
and thermoplastic elastomer (black)
Battery
•••••••••••••••••••
ABS resin (black)
Charger
••••••••••••••••••
ABS resin (black)
Sealed cylindrical nickel cadmium battery
Nominal voltage
•••••••••••••••
DC 7.2 V
Nominal life
•••••••••••••••••••••
Charging/discharging: approximately 500/300 times
Nominal capacity
•••••••••••••
1.4 Ah/1.2 Ah
Charging time
••••••••••••••••••
60/50 minutes
(with standard accessory charger at ambient temperature of 20 ˚C)
Charging temperature
•••••••
10 ˚C --- 40 ˚C (50 ˚F --- 104 ˚F)
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: 28 W
Function: On
•••••••••••••••••••••
During charging
Off
•••••••••••••••••••••
Charging completed
Capacity
Keyless chuck
(10TLRG-N)
Rotation speed
Torque
Type of motor
Type of switch
Handle configuration
Enclosure
Battery
(Type FEB 7S/EB 712S)
Charger
(Model UC 7SD)
Weight
Standard accessories
Gross with 2 batteries (FEB 7S) and charger, case
•••••••••••••••••••
4.1 kg (9.0 Ibs.)
Gross with battery (FEB 7S) and charger, case
••••••••••••••••••••••••
3.8 kg (8.8 Ibs.)
Gross with 2 batteries (EB 712S) and charger, case
•••••••••••••••••
4.0 kg (8.4 Ibs.)
Gross with battery (EB 712S) and charger, case
•••••••••••••••••••••••
3.7 kg (8.2 Ibs.)
Main body (including FEB 7S/EB 712S)
•••••••••••••
1.3 kg (2.8 Ibs.)/1.2 kg (2.6 Ibs.)
Charger unit (including cord)
•••••••••••••••••••••••••••••••••••••••••••••••••••••
1.2 kg (2.6 Ibs.)
Charger (UC 7SD)
•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
1
Cross-recessed head (plus) driver bit (No. 2)
••••••••••••••••••••••••••••••••••••••••••••••••••••
1
Case
••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
1
Loading...