Maintenance And Service - Bosch GBH 4-32 DFR Professional Operating Instructions Manual

OBJ_BUCH-337-001.book Page 19 Monday, May 7, 2007 10:34 AM
Turn the mode selector switch 5 to the requested
position.
Position for drilling without
impact in wood, metal,
ceramic and plastic as well as
for screwdriving and thread
cutting.
Position for hammer drilling
in concrete or stone
When the drilling tool does
not immediately rotate upon
switching on, allow the
machine to run slowly until the
drilling tool rotates.
Vario-Lock position for
adjustment of the chiselling
position
Position for chiselling
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 reverse 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 depressed.
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 certain 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.
1 619 929 774 • 7.5.07
Overload Clutch
Changing the Chiselling Position (Vario-Lock)
The chisel can be locked in 12 positions. In this man-
ner, the optimum working position can be set for each
application.
Insert the chisel into the tool holder.
Turn the mode selector switch 5 to the "Vario-Lock"
position (see "Setting the Operating Mode",
page 18).
Turn the application tool to the requested chiselling
position.
Turn the mode selector switch 5 to the "chiselling"
position. The tool holder is now locked.
For chiselling, set the rotation direction to right rota-
tion.
Operating Instructions
Vibration Damper
The integrated vibration damper reduces occurring
.
vibrations.
.

Maintenance and Service

Maintenance and Cleaning
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.
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 machine on with the drilling tool
jammed, high reaction torques can occur.
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 service.
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