Bosch GSH 5 E PROFESSIONAL Originalbetriebsanleitung Seite 13

Switching On and Off
I
0
For starting operation of the machine, press the
On/Off switch 5 from above until it latches (I).
For switching off the machine, press the On/Off
switch 5 to the bottom (0) and release.
At low temperatures, the machine reaches
full impact rate only after a certain time.
This start-up time can be shortened by
striking the chisel against the floor once.
Changing the Impact Rate
The electronic control makes possible the contin-
uous selection of the impact rate in accordance
with the material to be worked. The setting is
made with impact rate control 6.
The speed must be selected in accordance with
the material.
When inserting the mains plug into the outlet or
after a power failure, the constant-electronic au-
tomatically adjusts to the maximum impact fre-
quency. This avoids operation below optimum
capacity, due to a low pre-setting of the speed se-
lector thumbwheel 6.
The values in the table are recommendations.
Depending on application, the electronic control
should be adjusted with the speed selector thum-
bwheel 6.
Area of Application
Plaster/lightweight materials
Removing tiles
Brick
Concrete
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.
Slide the chisel adjusting ring 3 forward and hold
firmly. Then turn the chisel with the chisel adjust-
ing ring 3 until the desired position is reached.
Release the chisel adjusting ring 3 and turn the
chisel until it locks into place.
13 • 1 619 929 E43 • TMS • 15.02.06
Control Setting
Min.
Max.
English - 3
Sharpening Chisels
Good results are only achieved with sharp chis-
els, therefore sharpen the chiselling tools in good
time. This prolongs the service life of the tools
and ensures good working performance.
Re-sharpening the Chiselling Tools
Sharpen chiselling tools using grinding wheels
(e. g. ceramic bonded corundum wheel) with a
steady supply of water. Reference values are
shown in Fig. D. Take care that no annealing col-
oration appears on the cutting edges, otherwise
the hardness of the chiselling tools will be im-
paired.
Forging and Hardening
Forging: Heat the chisel to between 850
and 1050 °C (bright red to yellow)
and forge.
Hardening: Heat the chisel to 900 °C (bright
red) and quench in oil, then an-
neal in an oven for approx. one
hour at 320 °C (annealing col-
our = light blue).
Maintenance and Cleaning
Before any work on the machine itself, pull the
mains plug.
For safe and proper working, always keep the
machine and the ventilation slots clean.
Keep the tool holder clean at all times.
Changing the Dust Protection Cap
A damaged dust protection cap should be
changed immediately. We recommend having
this carried out by an after-sales service.
Lubrication
The machine is oil-lubricated. An oil change is
only required during maintenance or repair
through an authorized after-sales service agent
for Bosch power tools. It is imperative to use the
designated Bosch oil.
Service indicator 7 (red)
When the carbon brushes are worn out, the ma-
chine switches itself off. This is indicated approx.
eight hours beforehand by the lighting or blinking
of the service indicator 7. The machine must then
be sent to customer service for maintenance (for
addresses, see Section "Service and Customer
Assistance").