Auxiliary Handle; Changing The Tool - Bosch GBH 4-32 DFR Professional Manual

Assembly
Before any work on the machine itself, pull
the mains plug.

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 coun-
terclockwise 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
insert 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 adjust-
ment 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 corre-
spond with the desired drilling depth X.
The knurled surface of the depth stop 11 must face
downward.
Selecting the Tool Holder
For hammer drilling, SDS-plus drilling tools that can
be inserted into the SDS-plus tool holder 1 are
required.
For drilling without impact in wood, metal, ceramic
and plastic 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 chisel-
ling.
The SDS-plus tool holder 1 can easily be exchanged
against the quick change keyless chuck 12.
1 619 929 774 • 7.5.07
Changing the Tool Holder
Dismounting the SDS-plus Tool Holder or the
Keyless Replacement Chuck (see figure B)
Pull the lock ring of the tool holder 4 firmly in the direc-
tion of the arrow, hold it in this position and pull off the
tool holder 1 or the keyless replacement chuck 12
toward the front.
After removing, protect the tool holder 1 or the keyless
replacement chuck 12 against contamination. Lightly
lubricate the engaging grooves, if required.
Mounting the SDS-plus Tool Holder or the Key-
less Replacement Chuck
Grasp the tool holder 1 or the keyless replacement
chuck 12 completely with your hand. Slide the tool
holder 1 or the keyless replacement chuck 12 with a
turning motion onto the drill chuck mounting until a
distinct latching noice is heard.
The tool holder 1 or the keyless replacement chuck 12
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 pro-
tection cap 2 is not damaged.
A damaged dust protection cap should be
changed immediately. We recommend hav-
ing 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 chisel-
ling.
Insert the quick change keyless chuck 12.
English | 17