Starting Operation; Working Advice; Maintenance And Service; Maintenance And Cleaning - Bosch PBS 75 A Manual Original

14 | English
Changing the Sanding Belt (see figures B–D)
– Completely pivot out the clamping lever 3. The sanding
belt 2 is now loose and can be removed.
– Mount the new sanding belt 2. Pay attention that the direc-
tion of the arrows on the inside of the sanding belt corre-
spond with the arrow direction on the machine housing.
– Pivot the clamping lever 3 back to its initial position.
– Pick up the machine and switch it on. The belt run is auto-
matically centred upon switching on and during the sand-
ing procedure.
If the sanding belt is not centred after switching on the ma-
chine, the belt run must be readjusted manually, if required.
For this, readjust adjustment screw 13 at the front roll using a
screwdriver until the sanding belt 2 runs in a position with dis-
tance of about 2–3 mm between the belt and the aluminium
housing, see figure D. Should the belt run still not be centred
after this, then the sanding belt 2 must be replaced.
Selecting the Sanding Belt
Depending on the material to be worked and the required rate
of removal, different sanding belts are available:
For the working of all wooden
materials
For coarse-sanding, e. g. of
rough, unplaned beams and
boards
For face sanding and planing
small irregularities
For finish and fine sanding of
hard woods
Operation

Starting Operation

 Observe correct mains voltage! The voltage of the pow-
er 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, press the lock-on button
7.
To switch off the machine, release the On/Off switch 5 or
when it is locked with the lock-on button 7, briefly press the
On/Off switch 5 and then release it.
To save energy, only switch the power tool on when using it.
Preselecting the Belt Speed (PBS 75 AE)
The necessary belt speed can be preselected with the thumb-
wheel 4, even during operation.
The required belt speed depends on the material being sand-
ed and on the working conditions, and can be determined by
practical testing.
1 609 92A 0SJ | (23.7.14)
Grain size
40–240
coarse 40, 60
medium 80, 100, 120
fine 180, 240

Working Advice

 Before any work on the machine itself, pull the mains
plug.
The sanding removal rate and the surface quality are mainly
determined by the selection of the sanding belt as well as by
the preselected belt speed (PBS 75 AE). The higher the belt
speed, the more material is removed and the finer the sanded
surface.
Only flawless sanding belts achieve good sanding capacity
and make the machine last longer.
Work using the least possible sanding pressure in order to in-
crease the service life of the sanding belts. The machine's own
weight is sufficient for a good sanding performance. An exces-
sive increase of the sanding pressure does not lead to an in-
crease of the sanding capacity, but to increased wear of the
machine and the sanding belt.
Apply the machine to the workpiece only when switched on.
Work with moderate feed and carry out the sanding with par-
allel and overlapping strokes. Sand in the direction of the
grain; sanding across the grain produces an uneven sanding
effect.
Particularly when sanding coats of varnish, sand in the direc-
tion of the grain as the varnish could melt and smear the sur-
face of the workpiece and the sanding belt. Therefore, work
with dust extraction.
A sanding belt used for sanding metal should not be used for
other materials.
Use only original Bosch sanding accessories.
Store sanding belts only hanging; avoid creasing, as this
makes the belts unusable.
The sanding frame (accessory) allows for uniform and con-
trollable removal capacity when surface grinding larger wood-
en surfaces.

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.
Remove adherent sanding dust with a brush.
Cleaning the Dust Passage (see figure E)
From time to time, remove the protection cover 14 and clean
the dust passage 15 so that the suction capacity remains at an
optimum level.
If the replacement of the supply cord is necessary, this has to
be done by Bosch or an authorized Bosch service agent in or-
der to avoid a safety hazard.
Bosch Power Tools