Bosch GBH 7-46 DE Professional Operating Instructions Manual page 10

OBJ_BUCH-489-001.book Page 10 Wednesday, September 5, 2007 10:29 AM
10 | English
Switching On/Off in Chiseling Mode
To start the machine, press the On/Off switch 4
at the top (I) until it locks.
To switch off the machine, press the On/Off
switch 4 at the bottom (0) and release it.
For low temperatures, the power tool reaches
the full hammer/impact capacity only after a cer-
tain 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 prese-
lected speed and impact rate nearly constant be-
tween no-load and load conditions.
The maximum hammering capacity is achieved
when the dial control 5 is set to position "6". For
lower speed settings, the hammering capacity is
lower due to technical reasons.
Select the speed with the dial control 5 accord-
ing to the material.
The data in the following table are recommended
values.
Operating Hammer Drilling
Mode
Dial con- Rated
trol 5 Speed
(rpm)
1 145
2 170
3 200
4 225
5 255
6 280
1 619 929 734 | (5.9.07)
Chiseling
Impact Impact
Rate Rate
(bpm) (bpm)
1350 1375
1625 1650
1975 2025
2175 2225
2475 2550
2700 2800
Overload 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 switch-
ing the power tool on with the drilling tool
jammed, high reaction torques can occur.
Changing the Chiseling 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 9).
Turn the tool holder to the requested chiseling
position.
Turn the mode selector switch 3 to the chiseling
position. The tool holder is now locked.
The mode selector switch 3 must always be
locked in the "Chiselling" position when
chiselling.
Maintenance and Service
Maintenance and Cleaning
Before any work on the power tool itself,
pull the mains plug.
For safe and proper working, always keep
the power tool and the ventilation slots
clean.
A damaged dust protection cap should be
changed immediately. We recommend hav-
ing this carried out by an after-sales service.
If the power tool should fail despite the care tak-
en in manufacturing and testing procedures, re-
pair should be carried out by an after-sales ser-
vice center for Bosch power tools.
In all correspondence and spare parts orders,
please always include the 10-digit article number
given on the type plate of the power tool.
Bosch Power Tools