Maintenance And Service - Bosch GBH 5-40 DCE Professional Originalbetriebsanleitung

OBJ_BUCH-1742-002.book Page 14 Wednesday, December 5, 2012 2:46 PM
14 | English
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.
To save energy, only switch the power tool on when using it.
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.
Application
Working roughcast/light building materials
Removing tiles
Working brick
Working concrete
Safety Clutch
 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.
 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.
1 609 92A 046 | (5.12.12)
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 13).
– 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.
 The mode selector switch 3 must always be locked in
the "Chiselling" position when chiselling.
Working Advice
 Before any work on the machine itself, pull the mains
plug.
Vibration Damper
The integrated vibration damper reduces occurring vibra-
tions.
The soft grip handle increases the safety against slipping off
and thus provides for a better grip and handling of the power
tool.

Maintenance and Service

Maintenance and Cleaning
 Before any work on the machine itself, pull the mains
plug.
 For safe and proper working, always keep the machine
and ventilation slots clean.
 A damaged dust protection cap should be changed im-
mediately. We recommend having this carried out by
an after-sales service.
If the replacement of the supply cord is necessary, this has to
be done by Bosch or an authorized Bosch service agent in or-
der to avoid a safety hazard.
Thumb-
Service Indicator 8
wheel Posi-
When the carbon brushes are worn out, the machine switches
tion
itself off. This is indicated approx. 8 hours beforehand by the
lighting or blinking of the service indicator 8. The machine
must then be sent to an after-sales service agent. Addresses
are listed in the Section "After-sales Service and Application
Service".
Stand-by Indicator 9
When the mains plug is plugged in and mains voltage is given,
the stand-by indicator 9 must be lit. When the machine can-
not be switched on despite lit stand-by indicator 9, it must be
sent to an after-sales service agent; for addresses, see sec-
tion "After-sales Service and Application Service", page 15.
If the machine should fail despite the care taken in manufac-
turing and testing procedures, repair should be carried out by
an after-sales service centre for Bosch power tools.
Bosch Power Tools