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English
Do not discard batteries together with normal trash
and do not throw batteries into fire.
Store batteries out of the reach of children.
Use batteries correctly in accordance with the battery
specifications and indications.
2. 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. 18) (The
L
and
R
marks
are provided 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.
3. 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.
4. Tightening and loosening screws
(WH12DM2, WH9DM2)
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.
5. Number of screws tightenings possible
(WH12DM2, WH9DM2)
Please refer to the table below for the number of
screw tightened possible with one charge.
For WH12DM2 (EB1230HL)
For WH9DM2 (EB930H)
These values may vary slightly, according to
surrounding temperature and battery characteristics.
6. Number of bolt tightened possible
(WR12DM2, WR9DM2)
Please refer to the table below for the number of bolt
tightened possible with one charge.
For WR12DM2 (EB1230HL)
Screw used No. of tightenings
Wood screw ø4 × 50
Approx. 790
(Soft wood)
Machine screw M8 × 16 Approx. 1750
Bolt used No. of tightenings
M12 High tension bolt Approx. 180
Screw used No. of tightenings
Wood screw ø4 × 50
Approx. 530
(Soft wood)
Machine screw M8 × 16 Approx. 1690
Bolt used No. of tightenings
M12 Hightension bolt Approx. 120
For WR9DM2 (EB930H)
These values may vary slightly, according to
surrounding temperature and battery characteristics.
NOTE:
The use of the battery EB1230HL, EB930H 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.
NOTE:
Do not touch the protector, 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 Figs. 23, 24, 25 and 26 for the tightening
torque of bolts (according to size), under the
conditions shown in Fig. 27. 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.
5. Work at a tightening torque suitable for the bolt
under impact
The optimum tightening torque for nuts or bolts differs
with material and size of the nuts or bolts. An
excessively large tightening torque for a small bolt
may stretch or break the bolt. The tightening torque
increases in proportion to the operation time. Use
the correct operating time for the bolt.
67


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