Bosch GBH 3-28 DRE Professional - Manual (Page 15)

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Bosch Power Tools 1 609 92A 043 | (10.1.13)
GBH 3-28 DRE/GBH 3-28 DFR:
The vibration emission level given in this information sheet has
been measured in accordance with a standardised test given in
EN 60745 and may be used to compare one tool with another.
It may be used for a preliminary assessment of exposure.
The declared vibration emission level represents the main ap-
plications of the tool. However if the tool is used for different
applications, with different accessories or poorly maintained,
the vibration emission may differ. This may significantly in-
crease the exposure level over the total working period.
An estimation of the level of exposure to vibration should also
take into account the times when the tool is switched off or
when it is running but not actually doing the job. This may signif-
icantly reduce the exposure level over the total working period.
Identify additional safety measures to protect the operator
from the effects of vibration such as: maintain the tool and the
accessories, keep hands warm, organise work patterns.
Technical Data
Declaration of Conformity
We declare under our sole responsibility that the product de-
scribed under “Technical Data” is in conformity with the fol-
lowing standards or standardization documents: EN 60745
according to the provisions of the directives 2011/65/EU,
2004/108/EC, 2006/42/EC.
Technical file (2006/42/EC) at:
Robert Bosch GmbH, PT/ETM9,
D-70745 Leinfelden-Echterdingen
Robert Bosch GmbH, Power Tools Division
D-70745 Leinfelden-Echterdingen
Leinfelden, 14.12.2012
Assembly
 Before any work on the machine itself, pull the mains
plug.
Auxiliary Handle
 Operate your machine only with the auxiliary handle 12.
Changing the position of the auxiliary handle
(see figure A)
The auxiliary handle 12 can be set to any position for a secure
and low-fatigue working posture.
– Turn the bottom part of the auxiliary handle 12 in counter-
clockwise direction and swivel the auxiliary handle 12 to
the desired position. Then retighten the bottom part of the
auxiliary handle 12 by turning in clockwise direction.
Pay attention that the clamping band of the auxiliary handle is
positioned in the groove on the housing as intended for.
Adjusting the Drilling Depth (see figure B)
The required drilling depth X can be set with the depth stop 11.
Rotary Hammer GBH 3-28 DRE GBH 3-28 DFR
Article number 3 611 B3A 0.. 3 611 B4A 0..
Speed control  
Stop rotation  
Right/left rotation  
Quick change chuck – 
Rated power input W 800 800
Impact rate min -1 0 –4000 0 –4000
Impact energy per stroke according to EPTA-Procedure 05/2009 J 3.1 3.1
Speed min -1 0 –900 0 –900
Tool holder SDS-plus SDS-plus
Spindle collar diameter mm 50 50
Permissible drilling diameter, max.:
(also see page 16)
– Concrete*
– Brickwork (with core bit)
– Steel
– Wood
mm
mm
mm
mm 28
82
13
30 28
82
13
30
Weight according to EPTA-Procedure 01/2003 kg 3.5 3.6
Protection class / II / II
*not suitable with core bit
The values given are valid for a nominal voltage [U] of 230 V. For different voltages and models for specific countries, these values can vary.
Dr. Egbert Schneider
Senior Vice President
Engineering Helmut Heinzelmann
Head of Product Certification
PT/ETM9
OBJ_BUCH-770-006.book Page 15 Thursday, January 10, 2013 11:11 AM