Bosch GBH 4-32 DFR Professional Original Instructions Manual page 9

OBJ_BUCH-411-008.book Page 9 Thursday, November 2, 2017 8:54 AM
Auxiliary Handle
 Operate your machine only with the auxiliary handle
10.
The auxiliary handle 10 can be set to any position for a secure
and low-fatigue working posture.
– Turn the bottom part of the auxiliary handle 10 in counter-
clockwise direction and swivel the auxiliary handle 10 to
the desired position. Then retighten the bottom part of the
auxiliary handle 10 by turning in clockwise direction.
Adjusting the Drilling Depth (see figure A)
The required drilling depth X can be set with the depth stop
11.
– Press the button for the depth stop adjustment 9 and in-
sert the depth stop into the auxiliary handle 10.
– Insert the SDS-plus drilling tool to the stop into the SDS-
plus tool holder 1. Otherwise, the movability of the SDS-
plus drilling tool can lead to incorrect adjustment of the
drilling depth.
– Pull out the depth stop until the distance between the tip of
the drill bit and the tip of the depth stop corresponds with
the desired drilling depth X.
The knurled surface of the depth stop 11 must face down-
ward.
Selecting the Tool Holder
For hammer drilling, SDS-plus drilling tools that can be insert-
ed into the SDS-plus tool holder 1 are required.
For drilling without impact in wood, metal, ceramic and plas-
tic as well as for screwdriving and tapping, use non-SDS-plus
drilling tools (e. g., drill bits with cylindrical shank). A keyless
drill chuck is required for such drilling tools.
Note: Do not use tools without SDS-plus for hammer drilling
or chiselling! Tools without SDS-plus and their drill chucks are
damaged by hammer drilling or chiselling.
The SDS-plus tool holder 1 can easily be exchanged against
the quick change keyless chuck 13.
Changing the Tool Holder
Dismounting the SDS-plus Tool Holder or the Quick
change keyless chuck (see figure B)
– Pull the lock ring of the tool holder 4 firmly in the direction
of the arrow, hold it in this position and pull off the tool
holder 1 or the keyless replacement chuck 13 toward the
front.
After removing, protect the tool holder 1 or the quick change
keyless chuck 13 against contamination. Lightly lubricate the
engaging grooves, if required.
Mounting the SDS-plus Tool Holder or the Quick change
keyless chuck (see figure B)
 Use only model-specific original equipment and pay at-
tention to the number of identification grooves .Only
quick-change chucks with two identification grooves
are permitted. When an unsuitable quick-change chuck is
used, the application tool could fall out during operation.
Bosch Power Tools
– Grasp the tool holder 1 or the keyless replacement chuck
13 completely with your hand. Slide the tool holder 1 or
the keyless replacement chuck 13 with a turning motion
onto the drill chuck mounting until a distinct latching noice
is heard.
– The tool holder 1 or the quick change keyless chuck 13 is
automatically locked. Check the locking effect by pulling
the tool holder.
Changing the Tool
With the SDS-plus tool holder, simple and convenient tool
changing is possible without additional aids.
As a requirement of the system, the SDS-plus drilling 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.
The dust protection cap 2 largely prevents the entry of drilling
dust into the tool holder during operation. When inserting the
tool, take care that the dust protection cap 2 is not damaged.
 A damaged dust protection cap should be changed im-
mediately. We recommend having this carried out by
an after-sales service.
Inserting SDS-plus Drilling Tools (see figure C)
– Clean and lightly grease the shank end of the tool.
– Insert the tool in a twisting manner into the tool holder until
it latches itself.
– Check the latching by pulling the tool.
Removing SDS-plus Drilling Tools (see figure D)
– Push back the locking sleeve 3 and remove the tool.
Inserting Drilling Tools without SDS-plus (see figure E)
Note: Do not use tools without SDS-plus for hammer drilling
or chiselling! Tools without SDS-plus and their drill chucks are
damaged by hammer drilling or chiselling.
– Insert the quick change keyless chuck 13.
– Firmly hold the retaining ring of the quick change keyless
chuck 13. Open the quick change keyless chuck by turning
the front sleeve in the direction of the symbol
" ".
– Insert the drilling tool into the quick change keyless chuck
13. Firmly hold the retaining ring of the quick change key-
less chuck 13 and turn the front sleeve in the direction of
the symbol " ".
– Check the tight seating by pulling the tool.
Note: If the tool holder was opened to the stop, then the latch-
ing noise possibly may be heard while closing the tool holder
and the tool holder will not close.
In this case, turn the front sleeve 14 once in the opposite di-
rection of the arrow. Afterwards, the tool holder can be
closed (tightened) again.
– Turn the mode selector switch 5 to the "drilling" position.
Removing Drilling Tools without SDS-plus (see figure E)
– Firmly hold the retaining ring of the quick change keyless
chuck 13. Open the quick change keyless chuck by turning
the front sleeve in the direction of the symbol
" ".
– Remove the drilling tool.
English | 9
1 609 92A 40W | (2.11.17)