Working Instructions; Maintenance And Service - Bosch GBH 4-32 DFR Professional Original Operating Instructions

OBJ_BUCH-411-001.book Page 12 Friday, July 13, 2007 8:09 AM
12 | English
Reversing the Rotational Direction
Actuate the rotational direction switch 8
only when the power tool 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 chiseling always to right rotation.
Switching On and Off
To start the power tool, press the On/Off switch
7 and keep it pressed.
To switch off the power tool, 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 power
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.
Overload Clutch
If the tool insert becomes caught or jammed,
the drive to the drill spindle is interrupted.
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 power tool 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.
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Turn the mode selector switch 5 to the "Vario-
Lock" position (see "Setting the Operating
Mode", page 11).
Turn the tool holder to the requested chiselling
position.
Turn the mode selector switch 5 to the chiseling
position. The tool holder is now locked.
.
For chiseling, set the rotation direction to right
rotation.
.

Working Instructions

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

Maintenance and Service

Maintenance and Cleaning
Before any work on the power tool itself,
pull the mains plug.
For safe and proper working, always keep
the power tool and the ventilation slots
clean.
A damaged dust protection cap should be
changed immediately. We recommend hav-
ing this carried out by an after-sales service.
If the power tool should fail despite the care tak-
en in manufacturing and testing procedures, re-
pair should be carried out by an after-sales ser-
vice center for Bosch power tools.
In all correspondence and spare parts orders,
please always include the 10-digit article number
given on the type plate of the power tool.
Bosch Power Tools