Bosch GBH Professional 2-28 Manual Original página 16

16 | English
Rotary Hammer
Protection class
A) Weight without mains connection cable and without mains plug
The specifications apply to a rated voltage [U] of 230 V. These specifications may vary at different voltages and in country-specific models.
Values can vary depending on the product, scope of application and environmental conditions. To find out more, visit
www.bosch-professional.com/wac.
Noise/Vibration Information
Noise emission values determined according to EN 62841-2-6.
Typically, the A-weighted noise level of the power tool is:
Sound pressure level
Sound power level
Uncertainty K
Wear hearing protection!
Vibration total values a (triax vector sum) and uncertainty K determined according to EN 62841-2-6:
h
Hammer drilling into concrete:
a
h
K
Chiselling:
a
h
K
The vibration level and noise emission value given in these
instructions have been measured in accordance with a
standardised measuring procedure and may be used to com-
pare power tools. They may also be used for a preliminary
estimation of vibration and noise emissions.
The stated vibration level and noise emission value repres-
ent the main applications of the power tool. However, if the
power tool is used for other applications, with different ac-
cessories or is poorly maintained, the vibration level and
noise emission value may differ. This may significantly in-
crease the vibration and noise emissions over the total work-
ing period.
To estimate vibration and noise emissions accurately, the
times when the tool is switched off or when it is running but
not actually being used should also be taken into account.
This may significantly reduce vibration and noise emissions
over the total working period.
Implement additional safety measures to protect the oper-
ator from the effects of vibration, such as servicing the
power tool and accessories, keeping their hands warm, and
organising workflows correctly.
Assembly
Pull the plug out of the socket before carrying out any
u
work on the power tool.
Auxiliary handle
Do not operate your power tool without the auxiliary
u
handle (13).
1 609 92A 9A8 | (15.04.2024)
GBH 2-28
/ II
GBH 2-28
dB(A) 92
dB(A) 100
dB 3
2
m/s 11.0
2
m/s 1.5
2
m/s 8.1
2
m/s 1.5
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 (see figure A)
You can swivel the auxiliary handle (13) to any angle for a
safe work posture that minimises fatigue.
– Turn the lower gripping end of the auxiliary handle (13)
anticlockwise and swivel the auxiliary handle (13) into
the required position. Then turn the lower gripping end of
the auxiliary handle (13) 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
GBH 2-28 F
Removing the Quick-Change Chuck (see figure B)
– Pull back on the quick-change chuck locking ring (6), hold
it in this position and pull the SDS plus quick-change
GBH 2-28 GBH 2-28 F
/ II / II
GBH 2-28 GBH 2-28 F
92 92
100 100
3 3
11.0 9.8
1.5 1.5
8.1 7.6
1.5 1.5
GBH 2-28 F
/ II
GBH 2-28 F
92
100
3
9.8
1.5
7.6
1.5
Bosch Power Tools