Operational Cautions - Hitachi WH 12DAF Bedienungsanleitung

CAUTION
Applying the impact driver for too long tightens the
screw too much and can break it.
Tightening a screw with the impact driver at an angle
to that screw can damage the head of the screw and
the proper force will not be transmitted to the screw.
Tighten with this impact driver lined up straight with
the screw.
5. Number of screws tightenings possible
Please refer to the table below for the number of screw
tightened possible with one charge.
For WH12DAF (EB1214L)
Screw used
Wood screw ø4 × 50
(Soft wood)
Machine screw M8 × 16
These values may vary slightly, according to
surrounding temperature and battery characteristics.
NOTE
The use of the battery EB1222HL or EB1226HL in a
cold condition (below 0 degree Centigrade) can
sometimes result in the weakened tightening torque
and reduced amount of work. This, however, is a
temporary phenomenon, and returns to normal when
the battery warms up.

OPERATIONAL CAUTIONS

1. Resting the unit after continuous work
After use for continuous bolt-tightening work, rest the
unit for 15 minutes or so when replacing the battery.
The temperature of the motor, switch, etc., will rise if
the work is started again immediately after battery
replacement, eventually resulting in burnout.
M8 × 30
kgf cm N m
• •
1000 100
800 80
High tension bolt
600 60
400 40
200 20
Ordinary bolt
0 0
0 1
Tightening time: sec
(Steel plate thickness
t = 10 mm)
No. of tightenings
Approx. 230
Approx. 730
kgf cm N
•
1000
800
600
400
200
0
2 3
NOTE
Do not touch the hammer case, as it gets very hot
during continuous work.
2. Cautions on use of the speed control switch
This switch has a built-in, electronic circuit which
steplessly varies the rotation speed. Consequently,
when the switch trigger is pulled only slightly (low
speed rotation) and the motor is stopped while
continuously driving in screws, the components of
the electronic circuit parts may overheat and be
damaged.
3. Tightening torque
Refer to Fig. 13 for the tightening torque of bolts
(according to size), under the conditions shown in Fig.
14. Please use this example as a general reference,
as tightening torque will vary according to tightening
conditions.
NOTE
If a long striking time is used, screws will be strongly
tightened. This may cause the screw to break, or may
damage the tip of the bit.
If the unit is held at an angle to the screw being
tightened, the head of the screw may be damaged, or
the specified torque may not be transmitted to the
screw. Always keep the unit and the screw being
tightened in a straight line.
4. Use a tightening time suitable for the screw
The appropriate torque for a screw differs according
to the material and size of the screw, and the material
being screwed etc., so please use a tightening time
suitable for the screw. In particular, if a long tightening
time is used in the case of screws smaller than M8,
there is a danger of the screw breaking, so please
confirm the tightening time and the tightening torque
beforehand.
M10 × 30
m
•
100
80
High tension bolt
60
40
Ordinary bolt
20
0
0 1 2 3
Tightening time: sec
(Steel plate thickness
t = 10 mm)
Fig. 13
English
M12 × 45
kgf cm N m
• •
1200 120
1000 100
High tension bolt
800 80
600 60
400 40
Ordinary bolt
200 20
0 0
0 1 2
Tightening time: sec
(Steel plate thickness
t = 10 mm)
3
10