Operation; Maintenance And Service - Bosch GSH 11 E PROFESSIONAL Operating Instructions Manual

OBJ_BUCH-1 619 929 699-002.book Page 4 Tuesday, January 31, 2006 9:27 AM

Operation

Starting Operation
Observe correct mains voltage! The voltage of the
power source must agree with the voltage specified on
the type plate of the power tool.
Switching On and Off
To start the power tool, push the On/Off switch 4 to
the right.
To switch off the power tool, push the On/Off
switch 4 to the left.
For low temperatures, the power tool reaches the full
impact rate only after a certain time.
This start-up time can be shortened by striking the
chisel in the power tool against the floor one time.
Setting the Impact Rate
The electronic control enables stepless speed prese-
lection in accordance with the material to be worked.
The constant electronic control keeps the preselected
impact rate nearly constant between no-load and load
conditions.
Select the impact rate with the dial control 5 according
to the material.
The data in the following table are recommended val-
ues.
Dial Control Position 5
Impact Rate (bpm)
1 1030
2 1180
3 1360
4 1540
5 1720
6 1900
Changing the Chiselling Position (Vario-lock)
The chisel can be locked in 12 positions. In this man-
ner, the optimum working position can be set for each
application.
Insert the chisel into the tool holder.
Push the chisel adjustment ring 3 forward and turn the
chisel to the required position with the chisel adjust-
ment ring 3.
Release the chisel adjustment ring 3 and turn the chisel
until it latches.
1 619 929 699 • 31.1.06
Operating Instructions
Sharpening Chisels (see figure C)
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 chisel-
ling 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 color = light blue).

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 having this
carried out by an after-sales service.
Service Indicator 6
When the carbon brushes are worn out, the power tool
switches itself off. This is indicated approx. 8 hours
beforehand by the lighting or blinking of the service
indicator 6. The power tool must then be sent to an
after-sales service agent. Addresses are listed in the
Section "Service and Customer Assistance".
If the power tool should fail despite the care taken in
manufacturing and testing procedures, repair should
be carried out by an after-sales service 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.
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