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Cordless Impact Driver
pressed lightly or fully and allows you to illu-
minate the work area in case of insufficient
general lighting.
Practical advice
►Only apply the power tool to the screw/
nut when the tool is switched off. Rotat-
ing tool inserts can slip off.
The torque depends on the impact duration.
The maximum achieved torque results from
the sum of all individual torques achieved
through impact. Maximum torque is achieved
after an impact duration of 6–10 seconds.
After this duration, the tightening torque is in-
creased only minimally.
The impact duration is to be determined for
each required tightening torque. The actually
achieved tightening torque is always to be
checked with a torque wrench.
Screw applications with hard, spring-load-
ed or soft seats
When the achieved torques in an impact
series are measured during a test and trans-
ferred into a diagram, the result is the curve
of a torque characteristic. The height of the
curve corresponds with the maximum reach-
able torque, and the steepness indicates the
duration in which this is achieved.
A torque gradient depends on the following
factors:
►Strength properties of the screws/nuts
►Type of backing (washer, disc spring, seal)
►Strength properties of the material being
screwed/bolted together
►Lubrication conditions at the screw/bolt
connection
The following application cases result accord-
ingly:
►A hard seat is a metal-to-metal screw ap-
plication which uses washers. After a rela-
tively short impact duration, the maximum
torque is reached (steep characteristic
curve).Unnecessary long impact duration
only causes damage to the machine.
►A spring-loaded seat is also a met -
al-to-metal screw application but uses
spring washers, disc springs, studs or
screws/nuts with conical seats. It is also
called a springloaded seat when exten -
sions are used.
►A soft seat is a screw application of e.g.
metal on wood or a screw application that
uses lead washers or fibre washers as
backing.
For a spring-loaded seat as well as for a soft
seat, the maximum tightening torque is lower
nameplate of your power tool. Using
other batteries can lead to injuries and
pose a fire hazard.
Set the rotational direction switch (9) to
the middle position to avoid unintentionally
switching it on. Insert the charged battery (5)
into the handle until you feel it engage and it
is flush with the handle.
Set the rotational direction (see figure C)
The rotational direction switch (9) is used to
change the rotational direction of the power
tool. However, this is not possible while the
on/off switch (6) is being pressed.
Right rotation: To drive in screws and tighten
nuts, press the rotational direction switch (9)
through to the left stop.
Left Rotation: To loosen and unscrew screws
and nuts,press the rotational direction switch
(9) through to the right stop.
Switching on/off
To start the power tool, press and hold the on/
off switch(6).
To switch off the power tool, release the on/off
switch (6).
Preselection of the number of tov and
strokes, “auto stop” mode
When the reverse switch (9) is set to the left
position (clockwise rotation), one of three
torque/speed modes can be selected using
the button (3).Press the button repeatedly
until the desired setting appears in the speed
indicator.
The selected setting will be saved.
The required speed/impact rate is dependent
on the material and the work conditions and
can be determined by practical trials.
When the reverse switch (9) is set to the right
position (counter-clockwise rotation) this ad-
justment has no effect and the unscrewing
occurs at maximum speed/torque.
Also, when turning on the reverse to the twist-
ing mode (counterclockwise rotation), you
can use the button (3) to turn on the “AUTO
STOP” mode. In this mode, when unscrewing
the fastener, when the load disappears, the
screwdriver automatically stops.
Infinitely variable speed control
You can adjust the speed of the power tool
when it is on by pressing in the on/off switch
(12) to varying extents.
A light pressure on the on/off switch results in
a low rotational speed. Increased pressure on
the switch causes an increase in speed.
Switching the “PowerLight” lamp on/off
The backlight lights up when the switch is
7