Prior To Operation; How To Use; Operational Cautions - Hitachi WH 12DC Bedienungsanleitung

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PRIOR TO OPERATION

1. Preparing and checking the work environment
Make sure that the work site meets all the condi-
tions laid forth in the precautions.
2. Checking the battery
Make sure that the battery is installed firmly. If it
is at all loose it can fall off and cause an accident.
3. Installing the bit
Always follow the following procedure to install
driver bit. (Fig. 4)
(1) Pull the guide sleeve.
(2) Insert the bit into the hexagonal hole in the anvil.
(3) Release the guide sleeve and it returns to its origianl
position.
CAUTION
If the guide sleeve does not return to its original
position, then the bit is not installed properly.

HOW TO USE

1. Switch operation, changing the direction of rotation
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. 5).
and are written on the outer frame.
By pulling the switch trigger, the rotation speed will
infinitely vary from 0 to 2000 revolutions per minute.
NOTE: When the switch trigger is pulled only
slightly, a beep sound will be heard. This
is the sound of the motor, and it does not
indicate any abnormality.
CAUTION
While the impact driver is running, the push button
cannot be switched.
To switch it, turn off the impact driver first.
2. Tightening and loosening screws
Install the bit that matches the screw, line up the
bit in the grooves of the head of the screw, then
tighten it.
Push the impact driver just enough to keep the bit
fitting the head of the screw.
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.
6
3. Number of screw tightenings possible
(with one charge)
Please refer to the table below for the number of
screw tightenings possible with one charge.
Screw used
Wood screw ø3.8 x 20
(Soft wood)
Machine screw M8 x 16
These values may vary slightly, according to sur-
rounding temperature and battery characteristics.

OPERATIONAL CAUTIONS

1. After continuous work, allow the unit to rest
When you replace the batteries after continuously
using the unit to tighten screws, let the unit rest
for about 15 minutes.
If you continue using the unit immediately after
replacing the batteries, the motor and switch etc.
may become very hot, and may burn out.
2. Cautions on use of the speed control switch
This switch has a built-in, electronic circuit which
infinitely 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. 6, 7 and 8 for the tightening torque
of bolts (according to size), under the conditions
shown in Fig. 9. 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 end 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 tight-
ening 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.
No. of tightenings
Appro. 500
Appro. 870