Bosch Professional GBH 2-23 E Original Instructions Manual page 8

OBJ_BUCH-1281-005.book Page 8 Tuesday, October 17, 2017 2:10 PM
8 | English
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.
Removing SDS-plus Drilling Tools (see figure E)
– Push back the locking sleeve 3 and remove the tool.
Inserting Drilling Tools without SDS-plus
Note: Do not use tools without SDS-plus for hammer drilling!
Tools without SDS-plus and their drill chucks are damaged by
hammer drilling.
– Insert a key type drill chuck 14 (see "Changing the Key
Type Drill Chuck", page 7).
– Open the key type drill chuck 14 by turning until the tool
can be inserted. Insert the tool.
– Insert the chuck key into the corresponding holes of the
key type drill chuck 14 and clamp the tool uniformly.
– Set the selector switch 8 to the "Drilling" symbol.
Removing Drilling Tools without SDS-plus
– Turn the sleeve of the key type drill chuck 14 with the drill
chuck key in anticlockwise direction until the drilling tool
can be removed.
Dust Extraction with the Dust Extraction
Attachment (Accessory)
 Dust from materials such as lead-containing coatings,
some wood types, minerals and metal can be harmful to
one's health. Touching or breathing-in the dust can cause
allergic reactions and/or lead to respiratory infections of
the user or bystanders.
Certain dust, such as oak or beech dust, is considered car-
cinogenic, especially in connection with wood-treatment
additives (chromate, wood preservative). Materials con-
taining asbestos may only be worked by specialists.
– As far as possible, use a dust extraction system suitable
for the material.
– Provide for good ventilation of the working place.
– It is recommended to wear a P2 filter-class respirator.
Observe the relevant regulations in your country for the
materials to be worked.
 Prevent dust accumulation at the workplace. Dust can
easily ignite.
Mounting the Dust Extraction Attachment (see figure F)
For dust extraction, the dust extraction attachment (accesso-
ry) is required. When drilling, the dust extraction attachment
retracts so that the attachment head is always close to the
surface at the drill hole.
– Press the button for depth stop adjustment 9 and remove
the depth stop 10. Press button 9 again and insert the dust
extraction attachment into the auxiliary handle 11 from the
front.
– Connect an extraction hose (diameter 19 mm, accessory)
to the extraction sleeve 16 of the dust extraction attach-
ment.
The vacuum cleaner must be suitable for the material being
worked.
When vacuuming dry dust that is especially detrimental to
health or carcinogenic, use a special vacuum cleaner.
1 609 92A 40R | (17.10.17)
Adjusting the Drilling Depth on the Dust Extraction
Attachment (see figure G)
The required drilling depth X can also be adjusted when the
dust extraction attachment is mounted.
– 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.
– Loosen the wing bolt 20 on the dust extraction attach-
ment.
– Without switching the power tool on, apply it firmly to the
drilling location. The SDS-plus drilling tool must face
against the surface.
– Position the the guide pipe 21 of the dust extraction at-
tachment in its holding fixture in such a manner that the
head of the dust extraction attachment faces against the
surface to be drilled. Do not slide the guide pipe 21 further
over the telescopic pipe 19 of the dust extraction attach-
ment than required, so that as much as possible of the
scale 19 on the telescopic pipe remains visible.
– Retighten the wing bolt 20 again. Loosen the clamping
screw 17 on the depth stop of the dust extraction attach-
ment.
– Move the depth stop 18 on the telescopic pipe 19 in such
a manner that the clearance X shown in the figure corre-
sponds with the required drilling depth.
– Tighten the clamping screw 17 in this position.
Operation
Starting Operation
 Observe correct mains voltage! The voltage of the pow-
er source must agree with the voltage specified on the
nameplate of the machine. Power tools marked with
230 V can also be operated with 220 V.
Products sold in AUS and NZ only: Use a residual current de-
vice (RCD) with a rated residual current of 30 mA or less.
Setting the operating mode
With the selector switch for drilling/hammer drilling 8, the op-
erating mode of the machine is selected.
Note: Change the operating mode only when the machine is
switched off! Otherwise, the machine can be damaged.
– To change the operating mode, press the release button 7
and turn the drilling/hammer drilling selector switch 8 to
the desired position until it can be heard to latch.
Position for hammer drilling in concrete or
stone as well as for chiselling (chiselling only
with the MV 200 accessory)
Position for drilling without impact in wood,
metal, ceramic and plastic as well as for screw-
driving and thread cutting
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