Bosch GBH 5-40 DCE Professional - Manual (Page 14)

14 | English
1 619 929 J15 | (6.4.11) Bosch Power Tools
additives (chromate, wood preservative). Materials contain-
ing asbestos may only be worked by specialists.
– 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 mate-
rials to be worked.
Operation
Starting Operation
f 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.
Setting the Operating Mode
The operating mode of the power tool is selected with the
mode selector switch 3.
Note: Change the operating mode only when the machine is
switched off! Otherwise, the machine can be damaged.
– Turn the mode selector switch 3 to the requested position.
In the “chiselling” position, the impact rate preselected with
the thumbwheel 7 is automatically increased when switching
on; this causes the power tool to operate with increased ca-
pacity when chiselling.
Switching On/Off in Drilling Mode
– To start the machine, press the On/Off switch 5 and keep
it pressed.
– To switch off the machine, release the On/Off switch 5.
Switching On/Off in Chiselling Mode
– To start the machine, press the On/Off switch 5 at the top
(I) until it locks.
– To switch off the machine, press the On/Off switch 5 at the
bottom (0) and release it.
For low temperatures, the power tool reaches the full ham-
mer/impact capacity only after a certain time.
Setting the Speed/Impact Rate
The electronic control enables stepless speed and impact
preselection in accordance with the material to be worked.
The constant electronic control keeps the preselected speed
and impact rate nearly constant between no-load and load
conditions.
When plugging the plug into the socket outlet or after a power
failure, the constant electronic control automatically sets the
highest speed and impact rate. This ensures working at opti-
mum performance despite too low preadjustment of the
thumbwheel 7.
– Select the impact rate with the thumbwheel 7 according to
the material.
The data in the following table are recommended values.
Safety Clutch
f
If the tool insert becomes caught or jammed, the drive
to the drill spindle is interrupted. Because of the forces
that occur, always hold the power tool firmly with both
hands and provide for a secure stance.
f If the power tool jams, switch the machine off and loos-
en the tool insert. When switching the machine on with
the drilling tool jammed, high reaction torques can oc-
cur.
Changing the Chiselling Position (Vario-Lock)
The chisel can be locked in 12 positions. In this manner, the
optimum working position can be set for each application.
– Insert the chisel into the tool holder.
– Turn the mode selector switch 3 to the “Vario-Lock” posi-
tion (see “Setting the Operating Mode”, page 14).
– Turn the tool holder to the desired chiselling position.
– Turn the mode selector switch 3 to the “chiselling” posi-
tion. The tool holder is now locked.
f The mode selector switch 3 must always be locked in
the “Chiselling” position when chiselling.
Position for hammer drilling
When the drilling tool does not immediately
rotate upon switching on, allow the machine
to run slowly until the drilling tool rotates.
Vario-Lock position for adjustment of the
chiselling position
Position for chiselling
Application Thumbwheel
Position
Working roughcast/light building materials
Removing tiles
Working brick
Working concrete
OBJ_BUCH-491-006.book Page 14 Wednesday, April 6, 2011 4:45 PM