Hitachi WH10DCL [10/72] English
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Hitachi WH10DCL [10/72] English

Hitachi WH10DCL [10/72] English
9
English
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 bearing cover or impact mechanism
parts, as they get very hot during continuous work.
(Fig. 6)
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
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
A: Item No.
B: Code No.
C: No. Used
D: Remarks
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.
MODIFICATIONS
Hitachi Power Tools are constantly being improved
and modified to incorporate the latest technological
advancements.
Accordingly, some parts (i.e. code numbers and/or
design) may be changed without prior notice.
GUARANTEE
We guarantee Hitachi Power Tools in accordance with
statutory/country specific regulation. This guarantee does
not cover defects or damage due to misuse, abuse, or
normal wear and tear. In case of complaint, please send
the Power Tool, undismantled, with the GUARANTEE
CERTIFICATE found at the end of this Handling
instruction, to a Hitachi Authorized Service Center.
NOTE:
Due to HITACHI’s continuing program of research and
development, the specifications herein are subject to
change without prior notice.
01Eng_WH10DCL_EE 6/14/09, 4:14 PM9

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English OPERATIONAL CAUTIONS MAINTENANCE AND INSPECTION 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 riseif the work is started again immediately after battery replacement eventually resulting in burnout NOTE Do not touch the bearing cover or impact mechanism parts as they get very hot during continuous work Fig 6 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 torquefor 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 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 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 A Item No B Code No C No Used D Remarks 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 MODIFICATIONS Hitachi Power Tools are constantly being improved and modified to incorporate the latest technological advancements Accordingly some parts i e code numbers and or design may be changed without prior notice 9 GUARANTEE We guarantee Hitachi Power Tools in accordance with statutory country specific regulation This guarantee does not cover defects or damage due to misuse abuse or normal wear and tear In case of complaint please send the Power Tool undismantled with the GUARANTEE CERTIFICATE found at the end of this Handling instruction to a Hitachi Authorized Service Center NOTE Due to HITACHI S continuing program development the specifications herein change without prior notice of research and are subject to

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