17
Method of Operation
The tool holder
1
with the tool is driven by an electric motor
via a gear and impact mechanism.
The working procedure is divided into two phases:
Screwing in
and
tightening
(impact mechanism in
action).
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 batteries
with the voltage listed on the nameplate 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 position to
protect the power tool against accidental starting.
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 rota-
tional 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
.
To save energy, only switch the power tool on when using it.
Adjusting the Speed
The speed of the switched on power tool can be variably
adjusted, depending on how far the On/Off switch
8
is
pressed.
Light pressure on the On/Off switch
8
results in a low rota-
tional 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 maximum
achieved torque results from the sum of all individual 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
OBJ_BUCH-1468-002.book Page 17 Wednesday, July 31, 2013 8:24 AM
