Bosch GBH 3-28 E Operating Instructions Manual page 10

OBJ_BUCH-391-001.book Page 10 Thursday, May 3, 2007 9:19 AM
Inserting Drilling Tools without SDS-plus
(GBH 3-28 E)
Note: Do not use drilling tools without SDS-plus for
hammer drilling! Drilling tools without SDS-plus as well
as the tool holder are damaged when used for hammer
drilling.
Insert the key type drill chuck 11.
Open the key-type drill chuck 11 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 11 and clamp the tool uniformly.
Set the selector switch 6 to the "Drilling" symbol.
Removing Drilling Tools without SDS-plus
(GBH 3-28 E)
Turn the sleeve of the key type drill chuck 11 with the
drill chuck key in anticlockwise direction until the drill-
ing tool can be removed.
Dust Extraction with the Dust
Extraction Attachment (Accessory)
Mounting the Dust Extraction Attachment
(see figure G)
For dust extraction, the dust extraction attachment
(accessory) is required. When drilling, the dust extrac-
tion attachment retracts so that the attachment head is
always close to the surface at the drill hole.
Press the button for depth stop adjustment 5 and
remove the depth stop 9. Press button 5 again and
insert the dust extraction attachment into the auxiliary
handle 8 from the front.
Connect an extraction hose (diameter 19 mm, acces-
sory) to the extraction sleeve 16 of the dust extraction
attachment.
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.
Adjusting the Drilling Depth on the
Dust Extraction Attachment (see figure H)
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.
10 | English
Position the the guide pipe 21 of the dust extraction
attachment 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 attachment 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
attachment.
Move the depth stop 18 on the telescopic pipe 19 in
such a manner that the clearance X shown in the figure
corresponds with the required drilling depth.
Tighten the clamping screw 17 in this position.
Operation
Starting Operation
Observe correct mains voltage! The voltage of
the power source must agree with the voltage
specified on the type plate of the power tool.
Setting the Operating Mode
Actuate the selector switch for "drilling/ham-
mer drilling" 6 only when the power tool is at
a standstill.
Hammer drilling
Set the selector switch 6 to the "Hammer
drilling" symbol.
Drilling
Set the selector switch 6 to the "Drilling"
symbol.
Switching On and Off
To start the power tool, press the On/Off switch 7 and
keep it pressed.
To switch off the power tool, release the On/Off
switch 7.
For low temperatures, the power tool reaches the full
hammer/impact capacity only after a certain time.
This start-up time can be shortened by striking the
inserted tool insert against the floor one time.
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