Bosch Professional GSB 20-2 Original Instructions Manual page 14

14 | English
Impact drill
Protection class
The specifications apply to a rated voltage [U] of 230 V. These specifications may vary at different voltages and in country-
specific models.
Noise/vibration information
Noise emission values determined according to
EN 62841-2-1.
Typically, the A-weighted noise level of the power tool is:
Sound pressure level 95 dB(A); sound power level
106 dB(A). Uncertainty K = 5 dB.
Wear hearing protection!
Vibration total values a (triax vector sum) and uncertainty K
h
determined according to EN 62841-2-1.
2
Drilling into metal: a = 3.0 m/s , K = 1.5 m/s
h
Impact drilling into concrete: a = 15 m/s
h
2
Screwdriving: a < 2.5 m/s , K = 1.5 m/s
h
2
Thread cutting: a < 2.5 m/s , K = 1.5 m/s
h
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 ap-
plication tools or is poorly maintained, the vibration level
and noise emission value may differ. This may significantly
increase the vibration and noise emissions over the total
working 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 application tools, 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 (see figure A)
Do not operate your power tool without the auxiliary
u
handle (8).
You can adjust the auxiliary handle (8) to any of 12 positions
in order to achieve a safe work posture that minimises fa-
tigue.
Turn the lower gripping end of the auxiliary handle (8) in ro-
tational direction ➊ and push the auxiliary handle (8) for-
ward until you can swivel it into the required position. Then
pull the auxiliary handle (8) back again and turn the lower
gripping end in rotational direction ➋ to tighten it.
1 609 92A 55U | (18.11.2019)
Setting the Drilling Depth (see figure A)
You can use the depth stop to set the required drilling depth
X.
Turn the lower gripping end of the auxiliary handle (8) anti-
clockwise and set the depth stop (9).
Pull the depth stop far enough out that the distance between
the drill bit tip and the edge of the depth stop corresponds
to the required drilling depth X.
Then turn the lower gripping end of the auxiliary handle (8)
clockwise to retighten it.
2
The fluting on the depth stop (9) must face downwards.
2 2
, K = 2.0 m/s
2
Changing the tool
2
Wear protective gloves when changing tools. The drill
u
chuck may heat up significantly when it is used for long
periods.
Keyless chuck (see figure B)
The drill spindle is locked when the on/off switch (6) is not
pressed. This makes it possible to change the application
tool in the drill chuck quickly, conveniently and easily.
Open the keyless chuck (1) by turning it in the direction of
rotation ➊ until the tool can be inserted. Insert the tool.
Firmly tighten the sleeve of the keyless chuck (1) by turning
it by hand in the rotational direction ➋ until it stops clicking.
This will automatically lock the drill chuck.
The lock will disengage again if you turn the sleeve in the op-
posite direction to remove the tool.
Keyed chuck (see figure C)
Open the keyed chuck by turning it until the tool can be in-
serted. Insert the tool.
Insert the chuck key into the corresponding holes of the
keyed chuck and clamp the tool evenly.
Screwdriving tools (see figure D)
You should always use a universal bit holder (14) when using
screwdriver bits (13). Only use screwdriver bits that fit the
screw head.
For screwdriving, make sure the "drilling/impact drilling" se-
lector switch (2) is always set to the "drilling" symbol.
Changing the drill chuck
Pull the plug out of the socket before carrying out any
u
work on the power tool.
Removing the drill chuck (see figure E)
Remove the auxiliary handle and set the gear selector switch
(7) to the middle position between first and second gear.
Insert a steel pin with a diameter of 4 mm and a length of ap-
prox. 50 mm into the hole on the spindle collar to lock the
drill spindle in place. Clamp a hex key (15) in the keyless
chuck (1), leading with the short shaft.
GSB 20-2 GSB 20-2
/ II
Bosch Power Tools
/ II