Hitachi WR 12DH Mode D'emploi page 10

English
HOW TO USE
1. Check the rotational direction
The bit rotates clockwise (viewed from the rear
side) by pushing the R-side of the push button.
The L-side of the push button is pushed to turn
the bit counterclockwise. (See Fig. 7). (The
R
marks are engraved on the body.)
CAUTION
The push button can not be switched while the
impact driver is turning. To switch the push button,
stop the impact driver, then set the push button.
2. Switch operation
When the trigger switch is depressed, the tool
rotates. When the trigger is released, the tool stops.
The rotational speed can be controlled by varying
the amount that the trigger switch is pulled. Speed
is low when the trigger switch is pulled slightly and
increases as the trigger switch is pulled more.
3. Tightening and loosening bolts
A hex socket matching the bolt or nut must first
be selected. Then mount the socket on the anvil,
and grip the nut to be tightened with the hex socket.
Holding the wrench in line with the bolt, press the
power switch to impact the nut for several seconds.
If the nut is only loosely fitted to the bolt, the bolt
may turn wit the nut, therefore mistaking proper
tightening. In this case, stop impact on the nut and
hold the bolt head with a wrench before restarting
impact, or manually tighten the bolt and nut to
prevent them slipping.
kg–cm
M8 × 30
1000
800
High tension bolt
600
400
200
Ordinary bolt
0
0 1
Tightening time: sec
(Steel plate thickness
t = 10 mm)
Fig. 12
Bolt
Nut
9
kg–cm
1000
800
600
400
200
2 3
Steel plate thickness t
Fig. 15
4. Number of bolt tightened possible
(with one charge (EB12B))
Please refer to the table below for the number of
bolt tightened possible with one charge.
Bolt used
L
and
High tension bolt
M12 × 45
These values may vary slightly, according to sur-
rounding temperature and battery characteristics.
NOTE
The use of the battery EB12H 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. 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.
M10 × 30
High tension bolt
Ordinary bolt
0
0 1 2 3
Tightening time: sec
(Steel plate thickness
t = 10 mm)
Fig. 13
*The following bolt is used.
Ordinary bolt: Strength grade 4.8
High tensile bolt: Strength grade 12.9
(
Explanation of strength grade:
4 — Yield point of bolt: 32 kgf/mm
8 — Pulling strength of bolt: 40 kgf/mm
No. of tightenings
Approx. 130
kg–cm
M12 × 45
1200
High tension bolt
1000
800
600
Ordinary bolt
400
200
0
0 1 2
Tightening time: sec
(Steel plate thickness
t = 25 mm)
Fig. 14
2
3
)
2