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(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 diff ers with the diameter of the bolt. Generally a larger diameter bolt
requires larger tightening torque.
(4)
Tightening conditions
The tightening torque diff ers according to the torque ratio; class, and length of bolts
even when bolts with the same size threads are used. The tightening torque also diff ers
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)
Tightening torque varies, depending on the battery's charge level.
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 may 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 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.
5.
Storage
Store the impact driver in a place in which the temperature is less than 40°C, and out of
reach of children.
NOTE
Storing Lithium-ion Batteries
Make sure the batteries have been fully charged before storing them.
Prolonged storage (3 months or more) of batteries with a low charge may result in
performance deterioration, signifi cantly reducing battery usage time or rendering the
batteries incapable of holding a charge.
However, signifi cantly reduced battery usage time may be recovered by repeatedly
charging and using the batteries two to fi ve times.
If the battery usage time is extremely short despite repeated charging and use, consider
the batteries dead and purchase new batteries.
CAUTION
In the operation and maintenance of power tools, the safety regulations and
standards prescribed in each country must be observed.
36
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