Hitachi WR 18DBDL2, Instruction Manual

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(1) Tightening mode selector switch
By using the Tightening mode selector switch on the side
of the tool body, the tightening torque can be adjusted
according to the type of work.
The Tightening mode switches between 4 di ff erent modes
each time the Tightening mode selector switch is pressed.
In Single mode, when the switch is pulled and impacting
begins, the power tool automatically stops after a few
impacts.
In Low, Medium, and High modes, when the switch is
pulled and impacting begins, the power tool impacts
continuously (without automatically stopping).
4. Holding the tool
Hold the tool fi rmly with both hands. In this case hold
the tool in line with the bolt.
It is not necessary to push the tool very hard. Hold the
tool with a force just su ffi cient to counteract the impact
force.
5. Con fi rm the tightening torque
The following factors contribute to a reduction of the
tightening torque. So con fi rm the actual tightening
torque needed by screwing up some bolts before the
job with a hand torque wrench. Factors a ff ecting the
tightening torque are as follows.
(1) Voltage
When the discharge margin is reached, voltage
decreases and tightening torque is lowered.
(2) Operating time
The tightening torque increases when the operating
time increases. But the tightening torque does not
increase above a certain value even if the tool is
driven for a long time.
(3) Diameter of bolt
The tightening torque di ff ers with the diameter of the
bolt. Generally a larger diameter bolt requires larger
tightening torque.
NOTE
○ The appropriate mode di ff ers depending on the bolt
and the material being screwed. Tighten in a few test
bolts and adjust the mode setting accordingly.
○ The tightening mode selector switch can only be set
after the battery has been installed in the wrench and
the trigger switch has been pulled once.
Examples of tightening mode selector function settings
Low mode Medium mode High mode Single mode
Rotation speed 0 – 1,000 /min 0 – 2,000 /min 0 – 2,700 /min
Use
"Light load work"
Installing pipe supports, sca ff olding, etc.
"Heavy load work"
Assembling steel
frames, etc.
"Delicate work"
Tightening small
diameter screws (M6
or similar), etc.
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.
CAUTION
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. Work at a tightening torque suitable for the bolt under
impact
The optimum tightening torque for nuts or bolts di ff ers
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.
17
English
0000WR18DBDL2.indb 17 0000WR18DBDL2.indb 17 2016/09/28 9:48:01 2016/09/28 9:48:01