Working Advice; Maintenance And Service; Maintenance And Cleaning - Bosch GBH 7-46 DE Professional Originalbetriebsanleitung

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OBJ_BUCH-414-002.book Page 19 Tuesday, July 6, 2010 10:37 AM
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 prese-
lected speed and impact rate nearly constant
between no-load and load conditions.
The maximum hammering capacity is achieved
when the thumbwheel 5 is set to position "6".
For lower speed settings, the hammering capac-
ity is lower due to technical reasons.
– Select the speed with the thumbwheel 5 ac-
cording to the material.
The data in the following table are recommend-
ed values.
Operating Hammer Drilling
Mode
Thumb- Rated
wheel 5 Speed
(rpm)
1 145
2 170
3 200
4 225
5 255
6 280
Safety Clutch
If the tool insert becomes caught or
jammed, the drive to the drill spindle is in-
terrupted. 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 switch-
ing the machine on with the drilling tool
jammed, high reaction torques can occur.
Bosch Power Tools

Working Advice

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
– Turn the tool holder to the desired chiselling
– Turn the mode selector switch 3 to the "chis-
Chiselling
Impact Impact
Rate Rate
-1 -1
(min ) (min )
1350 1375
1625 1650

Maintenance and Service

1975 2025
2175 2225

Maintenance and Cleaning

2475 2550
2700 2800
If the machine should fail despite the care taken
in manufacturing and testing procedures, repair
should be carried out by an after-sales service
centre for Bosch power tools.
In all correspondence and spare parts order,
please always include the 10-digit article
number given on the type plate of the machine.
Before any work on the machine itself, pull
the mains plug.
"Vario-Lock" position (see "Setting the Oper-
ating Mode", page 18).
position.
elling" position. The tool holder is now
locked.
The mode selector switch 3 must always be
locked in the "Chiselling" position when
chiselling.
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 immediately. We recommend hav-
ing this carried out by an after-sales serv-
ice.
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