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18 | English
Switch position
Type of airflow
② Mixed external
and internal air-
flow
③ Mixed external
and internal air-
flow
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
Reduce the suction power or
strong.
switch to external dust ex-
traction, if necessary.
The bodyfiller material and/
Reduce the suction power or
or substrates are hard.
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
Reduce the speed.
too high.
The suction effect on the dry-
Reduce the suction effect or
wall sander is too strong.
switch to external dust ex-
traction.
The bodyfiller material has a
Switch on the external dust
high proportion of filler or is
extraction, set the suction
very soft.
power thumbwheel to set-
1 609 92A 7KA | (28.03.2022)
Use
Cause
Medium sanding
performance with
vacuum pressure
The grit of the abrasive is too
effect
coarse.
The surface quality is not optimal.
The grit of the abrasive is too
Ideal for sanding
coarse.
ceilings at low
The drying times for the
sanding speeds
bodyfiller material have not
but with high va-
been observed.
cuum pressure
The suction effect is too
(suction power)
strong.
for a low perceived
weight
The bodyfiller material has a
high proportion of filler or is
very soft.
The running power tool has
been positioned on the sur-
face (scoring).
There are sanding marks on the surface.
The hard sanding pad has
been positioned at an angle
on the surface.
In the case of very soft body-
filler material, the sanding
pad is too hard or the grit of
the abrasive is too coarse.
The suction effect is insufficient.
The suction power on the
dust extractor is too low.
The drywall sander's speed is
too high.
The internal dust extraction
on the drywall sander is too
low.
The bodyfiller material has a
high proportion of filler or is
very soft.
The main filter on the dust
extractor is blocked/
jammed.
Corrective measure
ting 6 and, in extreme cases,
reduce the speed.
Use a sanding sheet with a
finer grit.
Use a sanding sheet with a
finer grit.
Refer to the technical inform-
ation sheets and manufac-
turer's recommendations.
Reduce the suction power.
Use a sanding sheet with a
finer grit.
Position the power tool be-
fore switching it on.
Work on the surface and al-
ways work with the remov-
able brush segment.
Use a soft sanding pad with
an intermediate pad.
Use a soft sanding pad with
an intermediate pad.
Choose a finer abrasive grit.
Increase the suction power
on the dust extractor.
Reduce the speed.
Reduce the suction power or
switch to external dust ex-
traction.
Switch on the external dust
extraction, set the suction
power thumbwheel to setting
6 and, in extreme cases, re-
duce the speed.
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.
Bosch Power Tools
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