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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 operaton time. Use the correct operating time for the bolt.
5. Holding the tool
Hold the impact wrench firmly 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 sufficient to counteract the impact force.
6. 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.
(5) Using optional parts (WR14DBDL / WR18DBDL)
The tightening torque is reduced a little when an extension bar, universal
joint or a long socket is used.
(6) Clearance of the socket (WR14DBDL / WR18DBDL)
A worn or deformed hex. or a square-holed socket will not give an adequate
tightness to the fitting between the nut or anvil, consequently resulting in
loss of tightening torque.
Using an improper socket which does not match to the bolt will result in an
insufficient tightening torque.
(7) Tightening torque varies, depending on the battery’s charge level.
MAINTENANCE AND INSPECTION
1. Inspecting the driver bit (WH14DBDL / WH18DBDL)
Using a broken bit or one with a worn out tip is dangerous because the bit
can slip. Replace it.
2. Inspecting the socket (WR14DBDL / WR18DBDL)
A worn or deformed hex. or a square-holed socket will not give an adequate
tightness to the fitting between the nut or anvil, consequently resulting in
loss of tightening torque. Pay attention to wear of a socket holes periodically,
and replace with a new one if needed.
3. 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 may result in serious hazard.
4. 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.
5. Cleaning of the outside
When the 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, as they melt plastics.
6. Storage
Store the impact driver in a place in which the temperature is less than 40°C,
and out of reach of children.
NOTE:
Make sure that the battery is fully charged when stored for a long period (3
months or more). The battery with smaller capacity may not be able to be
charged when used, if stored for a long period.
7. 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.
MODIFICATIONS
Hitachi Power Tools are constantly being improved and modified to
incorporate the latest technological advancements.
Accordingly, some parts may be changed without prior notice.
Important notice on the batteries for the Hitachi cordless power tools
Please always use one of our designated genuine batteries. We cannot
guarantee the safety and performance of our cordless power tool when
used with batteries other than these designated by us, or when the
battery is disassembled and modified (such as disassembly and
replacement of cells or other internal parts).
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 reserch and development, the
specifications herein are subject to change without prior notice..
01Eng_WH14DBDL_EE 12/28/10, 16:4512