Operational Cautions - Hitachi WH 14DBDL Handling Instructions Manual

When the forward/reverse button is set to reverse, the
high/low mode and single/continuous mode are set to
"High" and "Continuous" respectively, regardless of the
indicators on the switch panel.
The mode switches between single and continuous
mode each time the single/continuous selector switch is
pressed.
In single mode, after the trigger switch has been pulled to
start operation, bolt-tightening stops automatically after 1
to 4 tightenings.
In continuous mode, when the trigger switch is pulled
to start operation, bolt-tightening continues (without
stopping automatically).
Rotation speed
Single/
Continuous
"Delicate work"
Tightening small
Use
diameter screws
(M6 or similar), etc.
7. Tightening and loosening screws (WH14DBDL /
WH18DBDL)
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 fi tting
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.
8. Tightening and loosening bolts
A hex. socket matching the bolt or nut must fi rst 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 fi tted to the bolt, the bolt may turn
with 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.

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.
20
Examples of tightening mode selector function settings
Low 1
900 /min
Single
"Light load work"
Affi xing plasterboard (select according to the
hardness of the base material) etc.
NOTE:
○ The appropriate mode diff ers depending on the screw
and the material being screwed. Drive in a few test
screws and adjust the mode setting accordingly.
○ The high/low and single/continuous selector switches
can only be set after the battery has been installed in the
driver and the trigger switch has been pulled once.
Low 2
1400 /min
Single
NOTE:
Do not touch the metal parts, 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. Use a tightening time suitable for the screw
The appropriate torque for a screw diff ers 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 confi rm the tightening time
and the tightening torque beforehand.
4. Work at a tightening torque suitable for the bolt
under impact
The optimum tightening torque for nuts or bolts diff 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.
5. Holding the tool
Hold the impact wrench fi rmly with both hands. In this
case hold the wrench in line with the bolt.
It is not necessary to push the wrench very hard. Hold
the wrench with a force just suffi cient to counteract the
impact force.
Medium
2000 /min
Single
"Heavy load work"
Tightening long screws,
coach screws, bolts, etc.
High
2600 /min
/2900 /min
Continuous