Auxiliary Handle; Selecting Drill Chucks And Tools; Changing The Drill Chuck; Changing The Tool - Bosch GBH 4-32 DFR Professional Manual Original

Auxiliary handle

Do not operate your power tool without the auxiliary
u
handle (12).
Make sure that the auxiliary handle is always
u
tightened. Otherwise you could lose control of the power
tool when working.
Swivelling the Auxiliary Handle
You can swivel the auxiliary handle (12) to any angle for a
safe work posture that minimises fatigue.
– Turn the lower gripping end of the auxiliary handle (12)
anticlockwise and swivel the auxiliary handle (12) into
the required position. Then turn the lower gripping end of
the auxiliary handle (12) clockwise to retighten it.
Make sure that the retaining strap of the auxiliary handle
slots into the corresponding groove of the housing.

Selecting drill chucks and tools

For hammer drilling and chiselling, you will need SDS plus
tools, which insert into the SDS plus drill chuck.
For drilling without impact in wood, metal, ceramic and
plastic as well as for screwdriving, tools without SDS plus
are used (e.g. cylindrical shank drill bits). A keyless chuck is
required for such drilling tools.

Changing the drill chuck

Removing/inserting the quick-change chuck
Removing the Quick-Change Chuck (see figure A)
– Pull back on the quick-change chuck locking ring (6), hold
it in this position and pull the SDS plus quick-change
chuck (2) or the keyless quick-change chuck (1) out from
the front.
– Once the quick-change chuck is removed, protect it from
dirt.
Inserting the quick-change chuck (see figure A)
Use only model-specific original equipment and pay
u
attention to the number of identification grooves.
Only quick-change chucks with two identification
grooves are permitted. If an unsuitable quick-change
chuck is used, the application tool can fall out during op-
eration.
– Before insertion, clean the quick-change chuck and lightly
grease the shank.
– Wrap your whole hand around the SDS-plus quick-change
chuck (2) or the keyless quick-change chuck (1). Use a
turning motion to push the quick-change chuck into the
drill chuck holder until you hear it click into place.
– The quick-change chuck is automatically locked. Check
that it is locked by pulling on the quick-change chuck.

Changing the Tool

The dust protection cap (4) largely prevents the penetration
of drilling dust into the tool holder during operation. When
inserting the tool, make sure that the dust protection cap (4)
does not become damaged.
Bosch Power Tools
Replace a damaged dust protection cap immediately.
u
It is recommended that you have use an after-sales
service for this.
Changing the tool (SDS plus)
Inserting SDS-plus application tools (see figure B)
The SDS-plus drill chuck enables you to change the applica-
tion tool easily and conveniently without needing to use ad-
ditional tools.
– Clean and lightly grease the insertion end of the applica-
tion tool.
– Insert the application tool into the tool holder while turn-
ing it until it locks automatically.
– Check the latching by pulling the tool.
As a requirement of the system, the SDS-plus application
tool can move freely. This causes a certain radial run-out at
no-load, which has no effect on the accuracy of the drill hole,
as the drill bit centres itself upon drilling.
Removing SDS-plus application tools (see figure C)
– Push the locking sleeve (5) back and remove the applica-
tion tool.
Changing the keyless quick-change chuck
Inserting the application tool (see figure D)
Note: Application tools that do not have SDS plus must not
be used for hammer drilling or chiselling. Tools without SDS
plus and their drill chucks are damaged by hammer drilling
or chiselling.
– Insert the keyless quick-change chuck (1).
– Hold the retaining ring (16) of the keyless quick-change
chuck firmly in place. Open the tool holder by turning the
front sleeve (15) in the direction of the RELEASE, OFF
symbol.
– Insert the application tool into the keyless quick-change
chuck (1). Hold the retaining ring of the keyless quick-
change chuck (16) in place and turn the front sleeve (15)
in the direction of the GRIP, ON symbol.
– Check that it is seated securely by pulling on the tool.
Note: If the tool holder was unscrewed all the way, a scrap-
ing sound may be heard while retightening the tool holder
and it may not fully tighten.
In this case, turn the front sleeve (15) in the opposite direc-
tion to the arrow by one full turn. This will allow the tool
holder to be fully tightened.
– Turn the impact/mode selector switch (7) to the "drilling"
position.
Removing the application tool (see figure D)
– Hold the retaining ring (16) of the keyless quick-change
chuck firmly in place. Open the tool holder by turning the
front sleeve (15) in the direction of the RELEASE, OFF
symbol.
– Remove the application tool.

Dust/Chip Extraction

Dust from materials such as lead-containing coatings, some
wood types, minerals and metal can be harmful to one's
health. Touching or breathing-in the dust can cause allergic
English | 15
1 609 92A 8AA | (20.09.2022)