Changing The Tool; Initial Operation; Maintenance And Cleaning - Bosch GSH 27 Bedienungsanleitung

Changing the Tool

Before any work on the machine itself, pull
the mains plug.
Clean and grease the tool shank.
Tools without shoulder
(see figures +
A
Open the tool retainer 3 approx. 150° ( ) and in-
sert the tool ( ).
Swing the tool retainer 3 downwards ( ) to lock
the tool.
Check the locking by pulling on the tool.
Tools with shoulder
(see figures +
C
Tools with an insertion length of 152 mm (6") are
suitable.
Open the tool retainer 3 approx. 180° ( ) and in-
sert the tool ( ).
Swing the tool retainer 3 back until in line with the
shank ( ), in order to lock the tool.
The shoulder 6 must be held by the tool re-
tainer 3.
Check the locking by pulling on the tool.

Initial Operation

Observe correct mains voltage: The voltage of
the power source must agree with the voltage
specified on the nameplate of the machine.
Equipment marked with 230 V can also be con-
nected to 220 V.
Switching On and Off
To start the machine, push the On/Off switch 1
and keep it pushed.
To switch off the machine, release the On/Off
switch 1.
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.
Operating Instructions
For the highest possible impact damping, work
only with moderate pressure.
10 • 1 619 929 583 • TMS • 25.02.02
)
B
)
D
Sharpening Chisels
Good results are only achieved with sharp chis-
els, therefore sharpen the chiselling tools regu-
lary. This prolongs the service life of the tools and
ensures good working performance.
Forging and hardening
Forging:
Hardening:
Re-sharpening the chiselling tools
Sharpen chiselling tools using grinding wheels
(e. g., ceramic bonded corundum wheel) with a
steady supply of water. Recommended values for
this purpose are contained in figure E. Take care
that no annealing coloration appears on the cut-
ting edges, otherwise the hardness of the chisel-
ling tools will be impaired.
E
60°
20°

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.
When the carbon brushes are worn out, the ma-
chine switches itself off. The machine must be
sent to customer service for maintenance (for ad-
dress, see the "Service and Customer Assist-
ance" 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.
English - 2
Heat the chisel to between 850
and 1050 °C (bright red to yellow)
and forge.
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).
4
60°
60°