Operation - Bosch GSH 388 PROFESSIONAL Bedienungsanleitung

Assembly
Auxiliary Handle
Operate your machine only with the auxiliary
handle 6.
The auxiliary handle 6 can be set to any position for a
secure and low-fatigue working posture.
Turn the bottom part of the auxiliary handle 6 in coun-
terclockwise direction and swivel the auxiliary handle 6
to the desired position. Then retighten the bottom part
of the auxiliary handle 6 by turning in clockwise direc-
tion.
Changing the Tool
Before any work on the machine itself, pull
the mains plug.
With the SDS-max tool holder, simpler and easier tool
changing is possible without additional aids.
The dust protection cap 1 largely prevents the entry of
drilling dust into the tool holder during operation. When
inserting the tool, take care that the dust protection cap
1 is not damaged.
A damaged dust protection cap should be
changed immediately. We recommend having
this carried out by an after-sales service.
Inserting (see figure A)
Clean and lightly grease the shank end of the tool.
Push back the locking sleeve 2 and insert the tool in a
twisting manner into the tool holder. Release the lock-
ing sleeve 2 again in order to lock the tool.
Check the latching by pulling the tool.
Removing (see figure B)
Push back the locking sleeve 2 and remove the tool.
1 619 929 E41 • 13.3.06

Operation

Starting Operation
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 5 and
keep it depressed.
To lock the pressed On/Off switch 5, push the lock-on
button 4 upward.
To switch off the machine, release the On/Off switch
5 or when it is locked with the lock-on button 4, briefly
press the On/Off switch 5 and then release it.
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.
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.
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 colour = light blue).
English–4