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Fig. 12
10. LED light warning signals (Fig. 12)
This product features functions that are designed
to protect the tool itself as well as the battery. While
the switch is pulled, if any of the safeguard functions
activate during operation, the LED light will blink as
described in Table 5. When any of the safeguard
functions are triggered, immediately remove your
fi nger from the switch and follow the instructions
described under corrective action.
4. Work at a tightening torque suitable for the bolt under
impact
The optimum tightening torque for nuts or bolts
diff ers 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. Holding the tool
Hold the tool fi rmly with both hands. In this case hold
the tool in line with the screw or bolt.
It is not necessary to push the tool very hard. Hold the
tool with a force just suffi cient to counteract the impact
force.
6. Confi rm the tightening torque
The following factors contribute to a reduction of the
tightening torque. So confi rm the actual tightening
torque needed by screwing up some bolts before the
job with a hand torque wrench. Factors aff 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.
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.
CAUTION
Do not touch the metal parts, as it gets 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 diff ers 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 5/16"
(M8), there is a danger of the screw breaking, so
please confi rm the tightening time and the tightening
torque beforehand.
Table 5
Safeguard Function LED Light Display Corrective Action
Overburden Protection
On 0.1 second/off 0.5 second
Remove the cause of the overburdening.
Temperature Protection
On 0.3 second/off 0.3 second
Allow the tool and battery to thoroughly cool.
14
English
0000WH18DDXmetabo.indb140000WH18DDXmetabo.indb14 2020/05/2811:33:352020/05/2811:33:35
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