Operation; Maintenance And Service - Bosch Professional GSH 27 Original Instructions Manual

Operation

Starting Operation
f Observe correct mains voltage! The voltage
of the power source must agree with the
voltage specified on the nameplate of the
machine. Power tools marked with 230 V
can also be operated with 220 V.
Switching On and Off
To start the machine, press the On/Off switch 1
and keep it pressed.
To switch off the machine, release the On/Off
switch 1.
For low temperatures, the machine reaches the
full impact rate only after a certain time.
This start-up time can be shortened by striking
the chisel in the machine against the floor one
time.
Working Advice
For the highest possible impact damping, work
only with moderate pressure.
Sharpening Chisels
Good results are only achieved with sharp chis-
els; 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 im-
pairs the hardness of the chiselling tools.
60
4
60
20
Bosch Power 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 ov-
en for approx. one hour at 320 °C (annealing
colour = light blue).

Maintenance and Service

Maintenance and Cleaning
f Before any work on the machine itself, pull
the mains plug.
f For safe and proper working, always keep
the machine and ventilation slots clean.
When the carbon brushes wear below accepta-
ble service tolerances, the machine will auto-
matically cut out. The machine must be sent to
customer service for maintenance (for address,
see the "After-sales Service and Customer As-
sistance" section.
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.
After-sales Service and Customer As-
sistance
Our after-sales service responds to your ques-
tions concerning maintenance and repair of your
product as well as spare parts. Exploded views
and information on spare parts can also be
found under:
60 www.bosch-pt.com
Our customer service representatives can an-
swer your questions concerning possible appli-
cations and adjustment of products and acces-
sories.
English | 17
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