Dust/Chip Extraction; Starting Operation; Maintenance And Service; Maintenance And Cleaning - Bosch GSH Professional 388 Originalbetriebsanleitung

OBJ_BUCH-142-003.book Page 17 Tuesday, August 3, 2010 4:41 PM

Dust/Chip Extraction

Dusts from materials such as lead-containing
coatings, some wood types, minerals and
metal can be harmful to one's health. Touch-
ing or breathing-in the dusts can cause aller-
gic reactions and/or lead to respiratory infec-
tions of the user or bystanders.
Certain dusts, such as oak or beech dust, are
considered as carcinogenic, especially in
connection with wood-treatment additives
(chromate, wood preservative). Materials
containing asbestos may only be worked by
specialists.
– Provide for good ventilation of the work-
ing place.
– It is recommended to wear a P2 filter-
class respirator.
Observe the relevant regulations in your
country for the materials to be worked.
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 pressed.
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.
Bosch Power Tools
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.
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 adjustment ring 3.
Release the chisel adjustment ring 3 and turn
the chisel until it latches.
Working Advice
Sharpening Chisels (see figure C)
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.
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

Before any work on the machine itself, pull
the mains plug.
For safe and proper working, always keep
the machine and ventilation slots clean.
A damaged dust protection cap should be
changed immediately. We recommend hav-
ing this carried out by an after-sales serv-
ice.
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