Operational Cautions; Maintenance And Inspection - Hitachi WH 14DCAL Bedienungsanleitung

English
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.

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 hammer case, as they get 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 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.
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
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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. 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.

MAINTENANCE AND INSPECTION

1. Inspecting the driver bit
Using a broken bit or one with a worn out tip is
dangerous because the bit can slip. Replace it.
2. Inspecting the mounting screws
Regularly inspect all mounting screws and ensure
that they are properly tightened. Should any of the
screws be loose, retighten them immediately. Failure
to do so could result in serious hazard.
3. Maintenance of the motor
The motor unit winding is the very "heart" of the
power tool.
Exercise due care to ensure the winding does not
become damaged and/or wet with oil or water.
4. Cleaning of the outside
When the angle impact driver is stained, wipe with a
soft dry cloth or a cloth moistened with soapy water.
Do not use chloric solvents, gasoline or paint thinner,
for they melt plastics.
5. Storage
Store the angle impact driver in a place in which the
temperature is less than 40°C and out of reach of
children.
6. Service parts list
CAUTION
Repair, modification and inspection of Hitachi Power
Tools must be carried out by a Hitachi Authorized
Service Center.
This Parts List will be helpful if presented with the
tool to the Hitachi Authorized Service Center when
requesting repair or other maintenance.
In the operation and maintenance of power tools,
the safety regulations and standards prescribed in
each country must be observed.