17
The impact mechanism is activated as soon as the
screwed connection runs tight and thus load is put on
the motor. In this instance, the impact mechanism
converts the power of the motor to steady rotary
impacts. When loosening screws or nuts, the process
is reversed.
Starting Operation
Inserting the Battery
❏
Use only original Würth lithium ion batter-
ies with the voltage listed on the name-
plate of your power tool.
Using other batteries
can lead to injuries and pose a fire hazard.
Set the rotational direction switch
7
to the centre posi-
tion to protect the power tool against accidental start-
ing.
Insert the charged battery
5
from the front into the
base of the power tool until the battery is securely
locked.
Reversing the Rotational Direction
(see figure B)
The rotational direction switch
7
is used to reverse the
rotational direction of the machine. However, this is
not possible with the On/Off switch
8
actuated.
Right rotation:
For driving in screws and tightening
nuts, press the rotational direction switch
7
through to
the left stop.
Left Rotation:
For loosening and unscrewing screws
and nuts, press the rotational direction switch
7
through to the right stop.
Switching On and Off
To
start
the machine, press the On/Off switch
8
and
keep it pressed.
The power light
9
lights up when the On/Off switch
8
is slightly or completely pressed, and allows the work
area to be illuminated when lighting conditions are
insufficient.
To switch off the machine,
release
the On/Off switch
8
.
Adjusting the Speed
The speed of the switched on power tool can be vari-
ably adjusted, depending on how far the On/Off
switch
8
is pressed.
Light pressure on the On/Off switch
8
results in a low
rotational speed. Further pressure on the switch
results in an increase in speed.
Working Advice
❏
Apply the power tool to the screw/nut only
when it is switched off.
Rotating tool inserts can
slip off.
The torque depends on the impact duration. The max-
imum achieved torque results from the sum of all indi-
vidual torques achieved through impact. The
maximum torque is achieved after an impact duration
of 6–10 seconds. After this duration, the tightening
torque is increased 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.
Reference Values for Maximum Screw/Bolt Tightening Torques
Calculated from the tensional cross-section; utilization of the yield point 90 % (with friction coefficient
μ
total
= 0.12). As a control measure, always check the tightening torque with a torque wrench.
Property Classes
according to
DIN 267
Standard Screws/Bolts
High-strength
Bolts
3.6
4.6
5.6
4.8
6.6
5.8
6.8
6.9
8.8
10.9 12.9
M 6
2.71
3.61
4.52
4.8
5.42
6.02
7.22
8.13
9.7
13.6
16.2
M 8
6.57
8.7
11
11.6
13.1
14.6
17.5
19.7
23
33
39
M 10
13
17.5
22
23
26
29
35
39
47
65
78
M 12
22.6
30
37.6
40
45
50
60
67
80
113
135
M 14
36
48
60
65
72
79
95
107
130
180
215
M 16
55
73
92
98
110
122
147
165
196
275
330
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Summary of Contents for ASS 14-1/4
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