Operation - Bosch Professional GBH 5-40 D Original Instructions Manual

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| English
Removing (see figure B)
– Push back the locking sleeve 2 and remove the tool.
Dust/Chip Extraction
Dusts 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 dusts can cause allergic
reactions and/or lead to respiratory infections of the user or
bystanders.
Certain dusts, such as oak or beech dust, are considered as
carcinogenic, especially in connection with wood-treatment
additives (chromate, wood preservative). Materials
containing 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
materials to be worked.

Operation

Starting Operation
► Observe correct mains voltage! The voltage of the
power 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.
To save energy, only switch the power tool on when using it.
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.
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
Switching On and Off
– To start the machine, press the On/Off switch 4 and keep
it pressed.
– To switch off the machine, release the On/Off switch 4.
For low temperatures, the power tool reaches the full
hammer/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.
F 000 622 413 | 08.2015
Manual GBH 5-40 D - Professional.indd 16
– Select the impact rate with the thumbwheel 6 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
loosen the tool insert. When switching the machine on
with the drilling tool jammed, high reaction torques
can occur.
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"
position (see "Setting the operating mode", page 7).
– Turn the tool holder to the desired chiselling position.
– Turn the mode selector switch 3 to the "chiselling"
position. 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.
Sharpening Chisels
Good results are only achieved with sharp chisels; therefore,
sharpen the chiselling tools in good time. This ensures a long
service life of the tools and good working performance.
– Re-sharpening
Sharpen chiselling tools using grinding wheels (e. g.
ceramic bonded corundum wheel) with a steady supply
of water. Reference values are shown in the figure. Take
care that no annealing coloration appears on the cutting
edges; this impairs the hardness of the chiselling tools.
– For forging, heat the chisel to between 850 and 1050 °C
(bright red to yellow).
– For hardening, heat the chisel to approx. 900 °C and
quench in oil. Then anneal in an oven for approx. one hour
at 320 °C (annealing colour = light blue).
Thumbwheel
Position
1
6
Bosch Power Tools
30/04/13 14:06