18
| English
Switch position
Type of airflow
Use
②
Mixed external
and internal air-
flow
Medium sanding
performance with
vacuum pressure
effect
③
Mixed external
and internal air-
flow
Ideal for sanding
ceilings at low
sanding speeds
but with high va-
cuum pressure
(suction power)
for a low perceived
weight
Adjusting suction power
You can adjust the suction power to achieve your preferred
balance between sanding speed and suction power. This
regulation is only possible when the internal airflow is activ-
ated (position
③
in the table above).
Adjust the suction power with the thumbwheel
(1)
:
– 1−5: Low to high suction power, suitable for sanding ceil-
ings
– 6: Highest suction power, suitable for sanding walls
Start with a low suction power (position 1) and increase
slowly, until there is a noticeable contact pressure.
High suction power allows low-fatigue sanding of ceilings
and walls. An excessively high suction power can cause the
power tool to vibrate, which can make handling more diffi-
cult.
Errors – Causes and Corrective Measures
Cause
Corrective measure
The drywall sander does not run smoothly or jolts across
the surface.
The suction effect is too
strong.
Reduce the suction power or
switch to external dust ex-
traction, if necessary.
The bodyfiller material and/
or substrates are hard.
Reduce the suction power or
switch to external dust ex-
traction, if necessary.
Reduce the speed.
The removal rate of the material to be machined is too
high.
The drywall sander's speed is
too high.
Reduce the speed.
The suction effect on the dry-
wall sander is too strong.
Reduce the suction effect or
switch to external dust ex-
traction.
The bodyfiller material has a
high proportion of filler or is
very soft.
Switch on the external dust
extraction, set the suction
power thumbwheel to setting
Cause
Corrective measure
6 and, in extreme cases, re-
duce the speed.
The grit of the abrasive is too
coarse.
Use a sanding sheet with a
finer grit.
The surface quality is not optimal.
The grit of the abrasive is too
coarse.
Use a sanding sheet with a
finer grit.
The drying times for the
bodyfiller material have not
been observed.
Refer to the technical inform-
ation sheets and manufac-
turer's recommendations.
The suction effect is too
strong.
Reduce the suction power.
The bodyfiller material has a
high proportion of filler or is
very soft.
Use a sanding sheet with a
finer grit.
The running power tool has
been positioned on the sur-
face (scoring).
Position the power tool be-
fore switching it on.
Work on the surface and al-
ways work
with
the remov-
able brush segment.
There are sanding marks on the surface.
The hard sanding pad has
been positioned at an angle
on the surface.
Use a soft sanding pad with
an intermediate pad.
In the case of very soft body-
filler material, the sanding
pad is too hard or the grit of
the abrasive is too coarse.
Use a soft sanding pad with
an intermediate pad.
Choose a finer abrasive grit.
The suction effect is insufficient.
The suction power on the
dust extractor is too low.
Increase the suction power
on the dust extractor.
The drywall sander's speed is
too high.
Reduce the speed.
The internal dust extraction
on the drywall sander is too
low.
Reduce the suction power or
switch to external dust ex-
traction.
The bodyfiller material has a
high proportion of filler or is
very soft.
Switch on the external dust
extraction, set the suction
power thumbwheel to setting
6 and, in extreme cases, re-
duce the speed.
The main filter on the dust
extractor is blocked/
jammed.
Clean the filter element regu-
larly:
– Option 1: Set the suction
power regulation to the
maximum suction power.
Seal the nozzle, extraction
hose or intake port on the
dust extractor with the
palm of your hand for
10 seconds until the auto-
matic cleaning starts.
1 609 92A 76T | (21.02.2022)
Bosch Power Tools
