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5. Con
fi
rm the tightening torque
The following factors contribute to a reduction of the tightening torque. So con
fi
rm the
actual tightening torque needed by screwing up some bolts before the job with a hand
torque wrench. Factors a
ff
ecting 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 di
ff
ers with the diameter of the bolt. Generally a larger diameter bolt
requires larger tightening torque.
(4) Tightening
conditions
The tightening torque di
ff
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 di
ff
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.
MAINTENANCE AND INSPECTION
1. Inspecting the tool
Since use of as dull tool will degrade e
ffi
ciency and cause possible motor malfunction,
sharpen or replace the tool as soon as abrasion is noted.
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 on the outside
When the driver drill 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 driver drill 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.
NOTE
Storing lithium-ion batteries.
Make sure the lithium-ion batteries have been fully charged before storing them.
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2015/4/22 13:32:29
2015/4/22 13:32:29