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

16 | English
Setting the Rotational Direction
The rotational direction switch (10) is used to change the ro-
tational direction of the power tool.
Always set the rotational direction to clockwise rotation for
hammer drilling, drilling and chiselling.
– Rotate clockwise: Turn the rotational direction
switch (10) until it stops in the
– Rotate anticlockwise: Turn the rotational direction
switch (10) until it stops in the
Switching On/Off
– To start the power tool, press the on/off switch (9) and
keep it pressed.
– To switch off, release the on/off switch (9).
For low temperatures, the power tool reaches the full ham-
mer/impact capacity only after a certain time.
Adjusting the Speed/Impact Rate
You can adjust the speed/impact rate of the power tool when
it is on by pressing in the on/off switch (9) to varying ex-
tents.
Applying light pressure to the on/off switch (9) results in a
low rotational speed/impact rate. Applying increasing pres-
sure to the switch increases the speed/impact rate.
Changing the chiselling position (Vario-Lock)
You can lock the chisel in 12 different positions, so you can
select the optimum working position for each task.
– Insert the chisel into the tool holder.
– Turn the impact/mode selector switch (7) to the "Vario-
Lock" position.
– Turn the application tool to the required chisel position.
– Turn the impact/mode selector switch (7) to the "chis-
elling" position. With this, the tool holder is locked.
– Set the rotational direction for chiselling to clockwise.

Practical Advice

Only apply the power tool to the screw/nut when the
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tool is switched off. Rotating tool inserts can slip off.
Setting the drilling depth (see figure E)
You can use the depth stop (13) to set the required drilling
depth X.
– Press the button for depth stop adjustment (11) and in-
sert the depth stop into the auxiliary handle (12).
The fluting on the depth stop (13) must face downwards.
– Insert the SDS-plus application tool into the SDS-plus tool
holder (3) to the stop. Otherwise, the movability of the
SDS-plus drilling tool can lead to incorrect adjustment of
the drilling depth.
– Pull the depth stop far enough out that the distance
between the drill bit tip and the edge of the depth stop
corresponds to the required drilling depth X.
Overload clutch
If the application tool jams or snags, the power trans-
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mission to the drill spindle will be interrupted. Always
hold the power tool firmly with both hands to with-
1 609 92A 70G | (29.03.2022)
stand the forces this may create and adopt a position
with stable footing.
Switch the power tool off immediately and remove the
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application tool if the power tool becomes blocked.
Switching on when the drilling tool is blocked may
cause high torque reactions.
position.
Vibration damping
position.
Do not continue to use the power tool if the damping
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element is damaged.

Maintenance and Service

Maintenance and Cleaning

Pull the plug out of the socket before carrying out any
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work on the power tool.
To ensure safe and efficient operation, always keep
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the power tool and the ventilation slots clean.
In order to avoid safety hazards, if the power supply cord
needs to be replaced, this must be done by Bosch or by an
after-sales service centre that is authorised to repair Bosch
power tools.
Replace a damaged dust protection cap immediately.
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It is recommended that you have use an after-sales
service for this.
– Clean the tool holder (3) after each use.

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. You can find explosion drawings and information on
spare parts at: www.bosch-pt.com
The Bosch product use advice team will be happy to help you
with any questions about our products and their accessor-
ies.
In all correspondence and spare parts orders, please always
include the 10‑digit article number given on the nameplate
of the product.
Great Britain
Robert Bosch Ltd. (B.S.C.)
P.O. Box 98
Broadwater Park
North Orbital Road
Denham Uxbridge
UB 9 5HJ
At www.bosch-pt.co.uk you can order spare parts or arrange
the collection of a product in need of servicing or repair.
Tel. Service: (0344) 7360109
E-Mail: boschservicecentre@bosch.com
You can find further service addresses at:
www.bosch-pt.com/serviceaddresses
The integrated vibration damping function re-
duces the generated vibration.
Bosch Power Tools