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Auxiliary Handle/Depth Stop
Operate the machine only with the auxiliary
handle 7.
Loosen the handle by turning to the left. Rotate
the auxiliary handle 7 and adapt to the working
position.
Afterwards tighten the handle again by turning in
clockwise direction.
The drilling depth can be set with the depth
stop 8.
For this, loosen wing bolt for depth stop adjust-
ment 6, set the required drilling depth X and
tighten the wing bolt again.
X
The ribbing on depth stop 8 must point upwards.
Starting Operation
Observe correct mains voltage: The voltage of
the power source must agree with the voltage
specified on the nameplate of the machine.
Equipment marked with 230 V can also be con-
nected to 220 V.
Switching On and Off
To start the machine, press the On/Off switch 3
and keep it depressed.
To switch off the machine, release the On/Off
switch 3.
For
low
temperatures,
reaches the full hammer/impact capacity
only after a certain time.
This start-up time can be shortened by
striking the drill/chisel against the floor one
time.
14 • 1 619 929 679 • TMS • 03.08.04
6
the
machine
Changing the
Speed/Impact Rate
With the On/Off switch 3, the rotational speed/im-
pact rate can be regulated between low and high
speed/rate. Light pressure on the On/Off switch 3
results in a low rotational speed/impact rate, for
example, for sensitive work such as hole starting.
With increased pressure, the rotational speed/im-
pact rate is increased.
Speed Table (GBH 4 DSC)
The electronic control enables continuous pre-se-
lection of speed and impact rate in accordance
with the material to be worked. Adjustment is car-
ried out with the speed selector thumbwheel 9.
The constant electronic control keeps the pre-se-
lected speed and impact rate nearly constant be-
tween no-load and load conditions.
The speed must be selected in accordance with
the material.
The values in the table are recommendations.
Area of
Application
Impact Drilling
- Stone/Concrete
Chiselling
Drilling
- Wood/Steel
Needle-descaling
English - 3
Impact Stop
Adjustment
Switch
Knob
Position 9
5 – 6
3 – 6
1 – 6/4 – 6
3 – 6
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