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

OBJ_BUCH-337-008.book Page 16 Thursday, June 16, 2016 2:05 PM
16 | English
Note: Change the operating mode only when the machine is
switched off! Otherwise, the machine can be damaged.
– Turn the mode selector switch 5 to the requested position.
Position for drilling without im-
pact in wood, metal, ceramic and
plastic as well as for screwdriving
Position for hammer drilling in
concrete or stone
When the drilling tool does not
immediately rotate upon switch-
ing on, allow the machine to run
slowly until the drilling tool ro-
tates.
Vario-Lock position for adjust-
ment 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 rota-
tional 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 save energy, only switch the power tool on when using it.
– 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 ham-
mer/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/im-
pact 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.
1 609 92A 2AA | (16.6.16)
 If the power tool jams, switch the machine off and loos-
en the tool insert. When switching the machine on with
the drilling tool jammed, high reaction torques can oc-
cur.
Changing the Chiselling Position (Vario-Lock)
The chisel can be locked in 13 positions. In this manner, 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" posi-
tion (see "Setting the operating mode", page 15).
– Turn the tool holder to the desired chiselling position.
– Turn the mode selector switch 5 to the "chiselling" posi-
tion. The tool holder is now locked.
– For chiselling, set the rotation direction to right rotation.

Working Advice

 Before any work on the machine itself, pull the mains
plug.
 Apply the power tool to the screw/nut only when it is
switched off. Rotating tool inserts can slip off.
Vibration Damper
The integrated vibration damper reduces occurring vibra-
tions.

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 im-
mediately. We recommend having this carried out by
an after-sales service.
If the replacement of the supply cord is necessary, this has to
be done by Bosch or an authorized Bosch service agent in or-
der to avoid a safety hazard.

After-sales Service and Application Service

Our after-sales service responds to your questions concern-
ing maintenance and repair of your product as well as spare
parts. Exploded views and information on spare parts can al-
so be found under:
www.bosch-pt.com
Bosch's application service team will gladly answer questions
concerning our products and their accessories.
In all correspondence and spare parts orders, please always
include the 10-digit article number given on the nameplate of
the product.
Bosch Power Tools