Operational Cautions - Hitachi WH 14DCAL Instructions De Sécurité Et Mode D'emploi

English
NOTE:
A buzzing noise is produced when the motor is about
to rotate. This is only a noise, not a machine failure.
Do not use the angle impact driver with the lock
button in an intermediate position. If used with the
lock button in an intermediate position, the switch
may suddenly be turned off while working or
suddenly come on when carrying. When changing
the position of the lock button, slide the lock button
until it reliably reaches and contacts the ON position
or OFF position.
Do not change the position of the lock button while
the switch lever is being pulled. Only change the
position of the lock button after having first released
the switch lever.
Do not place the angle impact driver in a manner
such that the switch lever is facing downward. This
can cause the switch to be turned on as a result of
pressing the switch lever.
Do not move the switch lever in the direction
opposite that of the angle impact driver. This can
cause a malfunction.
6. 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 angle impact driver just enough to keep the
bit fitting the head of the screw.
CAUTION:
● Applying the angle impact driver for too long
tightens the screw too much and can break it.
● Tightening a screw with the angle 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 angle impact driver lined up
straight with the screw.
7. 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 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.
14
CAUTION:
Do not touch the hammer case, as it gets very hot
during continuous work. (Fig. 1)
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 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 5/16" (8 mm), there is a danger of the screw
breaking, so please confirm 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
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 proportionate to the operation
time. Use the correct operating time for the bolt.
5. Confirm the tightening torque
The following factors contribute to a reduction of
the tightening torque. So confirm the actual
tightening torque needed by screwing up some bolts
before the job with a hand torque wrench. Factors
affecting 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 differs with the diameter of
the bolt. Generally a larger diameter bolt requires
larger tightening torque.
(4) Tightening conditions
The tightening torque differs according to the torque
ratio, class, and length of bolts even when bolts with
the same size threads are used. The tightening
torque also differs according to the condition of the
surface of workpiece through which the bolts are to
be tightened. When the bolt and nut turn together,
torque is greatly reduced.