Bosch Professional GBH 8-45 D Manual Original página 15

Position for chiselling
Switching On and Off in Drilling Mode
– To start the power tool, press the on/off switch (6) and
keep it pressed.
– To switch off, release the on/off switch (6).
Switching On and Off in Chiselling Mode
– To start the power tool, push the on/off switch (6) up-
wards (I) until it locks in place.
– To switch off the power tool, push the on/off switch (6)
back down (0) and release it.
For low temperatures, the power tool reaches the full ham-
mer/impact capacity only after a certain time.
Changing the chiselling position (Vario-Lock)
You can lock the chisel in 16 different positions, allowing
you to select the optimum working position for each task.
– Insert the chisel into the tool holder.
– Turn the mode selector switch (3) to the "drilling" posi-
tion.
– Turn the application tool to the required chisel position.
– Turn the mode selector switch (3) to the "chiselling" posi-
tion. With this, the tool holder is locked.
Adjusting the Speed/Impact Rate
The electronic control enables continuous speed and impact
rate preselection for material-specific adjustments.
– Select the impact rate with the thumbwheel (7) according
to the material.
The information in the table below describes the recommen-
ded values.
Application
Working on plaster/light building materials
Removing tiles
Working on brick
Working on concrete
Practical Advice
Overload clutch
If the application tool jams or snags, the power trans-
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mission to the drill spindle will be interrupted. Always
hold the power tool firmly with both hands to with-
stand the forces this may create and adopt a position
with stable footing.
Switch the power tool off immediately and remove the
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application tool if the power tool becomes blocked.
Switching on when the drilling tool is blocked may
cause high torque reactions.
Vibration damping
GBH 8-45 DV
Bosch Power Tools
Do not continue to use the power tool if the damping
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element is damaged.
Sharpening Chisels
Only sharp chiselling tools will produce good results, there-
fore sharpen your chiselling tools in good time before use.
This will ensure a long service life for the tools and good
work results.
Re-sharpening
Grind chiselling tools against sanding discs, e.g. aluminium
oxide, under a steady stream of water. Make sure that the
cutting edges show no annealing colours; this will impair the
hardness of the chiselling tools.
To forge a chisel, heat it to 850–1050 °C (pale red to yel-
low).
To harden a chisel, heat it to approx. 900 °C and quench in
oil. Then, leave it in an oven for approx. one hour at 320 °C
(annealing colour: pale blue).
Maintenance and Service
Maintenance and Cleaning
Pull the plug out of the socket before carrying out any
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work on the power tool.
To ensure safe and efficient operation, always keep
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the power tool and the ventilation slots clean.
In order to avoid safety hazards, if the power supply cord
needs to be replaced, this must be done by Bosch or by an
after-sales service centre that is authorised to repair Bosch
power tools.
Replace a damaged dust protection cap immediately.
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It is recommended that you have use an after-sales
Thumbwheel
service for this.
position
– Clean the tool holder after each use.
1
Service indicator
When the carbon brushes are worn out, the power tool
switches itself off. This is indicated approx. 8 hours before-
6
hand by the service indicator (8) lighting up or flickering.
The power tool must be sent to customer service for main-
tenance. For addresses, see: (see "After-Sales Service and
Application Service", page 15)
Stand by indicator
When the mains plug is plugged in and there is a mains
voltage, the stand by indicator should light up.
If the power tool cannot be switched on when the stand by
indicator is lit, it must be sent to the after-sales service. For
addresses, see: (see "After-Sales Service and Application
Service", page 15)
After-Sales Service and Application Service
Our after-sales service responds to your questions concern-
ing maintenance and repair of your product as well as spare
parts. You can find explosion drawings and information on
The integrated vibration damping function re-
duces the generated vibration.
1 609 92A 8M7 | (25.01.2023)
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