Working Advice; Maintenance And Service; Maintenance And Cleaning - Bosch GBH 4-32 DFR Professional Originalbetriebsanleitung

Reversing the Rotational Direction
Actuate the rotational direction switch 8
only when the machine is at a standstill.
The rotational direction switch 8 is used to re-
verse the rotational direction of the machine.
Right rotation: Turn the rotational direction
switch 8 to the stop in the position
Left rotation: Turn the rotational direction
switch 8 to the stop in the position
Set the direction of rotation for hammer drilling,
drilling and chiselling always to right rotation.
Switching On and Off
To start the machine, press the On/Off switch 7
and keep it pressed.
To switch off the machine, release the On/Off
switch 7.
For low temperatures, the power tool reaches
the full hammer/impact capacity only after a cer-
tain time.
Setting the Speed/Impact Rate
The speed/impact rate of the switched on pow-
er tool can be variably adjusted, depending on
how far the On/Off switch 7 is pressed.
Light pressure on the On/Off switch 7 results in
low speed/impact rate. Further pressure on the
switch increases the speed/impact rate.
Safety Clutch
If the tool insert becomes caught or
jammed, the drive to the drill spindle is in-
terrupted. Because of the forces that occur,
always hold the power tool firmly with both
hands and provide for a secure stance.
If the power tool jams, switch the machine
off and loosen the tool insert. When switch-
ing the machine on with the drilling tool
jammed, high reaction torques can occur.
Changing the Chiselling Position (Vario-Lock)
The chisel can be locked in 12 positions. In this
manner, the optimum working position can be
set for each application.
Insert the chisel into the tool holder.
Bosch Power Tools
Turn the mode selector switch 5 to the "Vario-
Lock" position (see "Setting the Operating
Mode", page 22).
Turn the tool holder to the desired chiselling po-
sition.
Turn the mode selector switch 5 to the "chisel-
ling" position. The tool holder is now locked.
.
For chiselling, set the rotation direction to right
rotation.
.

Working Advice

Vibration Damper
The integrated vibration damper reduces occur-
ring vibrations.

Maintenance and Service

Maintenance and Cleaning

Before any work on the machine itself, pull
the mains plug.
For safe and proper working, always keep
the machine and ventilation slots clean.
A damaged dust protection cap should be
changed immediately. We recommend hav-
ing this carried out by an after-sales serv-
ice.
If the machine should fail despite the care taken
in manufacturing and testing procedures, repair
should be carried out by an after-sales service
centre for Bosch power tools.
In all correspondence and spare parts order,
please always include the 10-digit article
number given on the type plate of the machine.
English | 23
1 619 929 774 | (2.3.09)