Starting Operation; Working Advice - Bosch GTR Professional 550 Notice Originale

head (11), tighten the eccentric screw (20), swivel the
safety hook (8) upwards and close the clamping lever (9).
When inserting the extension tube (10) into the handle
section (7) and the sanding head (11), perform the same
steps in reverse order.
Note: A maximum of two extension tubes may be inserted.
Always check that the connection elements are secured and
firmly attached to the safety hooks (8) and the clamping
levers (9).
Attaching/Removing Cable Clamps
(see figure D)
Place the cable clamp (21) over the vacuum hose (5). Insert
the power cable into the cable groove of the cable clamp.
To remove the cable clamp (21), pull it off of the vacuum
hose (5) and remove the power cable from the cable
clamp (21).
Operation

Starting Operation

Pay attention to the mains voltage. The voltage of the
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power source must match the voltage specified on the
Application Overview
Bodyfiller/ Wall/ceiling
plaster hardness
Very soft/soft Wall/ceiling
Medium hardness Wall
Ceiling
Extremely hard Wall/ceiling

Working Advice

Pull the plug out of the socket before carrying out any
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work on the power tool.
Always wait until the power tool has come to a com-
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plete stop before placing it down.
Do not put the power tool down on its side. This could
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permanently warp the sanding pad.
This power tool is not suitable for bench-mounted use.
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It must not be clamped into a vice or fastened to a work-
bench, for example.
Bosch Power Tools
rating plate of the power tool. Power tools marked
with 230 V can also be operated with 220 V.
Products that are only sold in AUS and NZ: Use a resid-
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ual current device (RCD) with a nominal residual current
of 30 mA or less.
Preselecting the Speed
You can preselect the required speed using the speed
preselection thumbwheel (2), even during operation. The
higher numbers indicate a high speed, while the smaller
ones represent a low speed.
The Constant Electronic keeps the speed at no load and un-
der load virtually consistent, guaranteeing uniform perform-
ance.
The electronic soft start limits the torque when the power
tool is switched on and increases the service life of the mo-
tor.
Switching On/Off
Make sure that you are able to press the On/Off switch
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without releasing the handle.
To switch on the power tool, press the on/off switch (3).
To switch off the power tool, press the on/off switch (3)
again.
Internal/external Suction power
airflow
➀ 6
➀ 6
1–3
➂
➀ on uneven sur- 6
faces
➂ on even surfaces 1–3
Sanding Surfaces
Switch the power tool on, place the entire sanding surface
against the surface of the workpiece and apply moderate
pressure as you move the sander over the workpiece.
The material removal rate and sanding result are primarily
determined by the choice of sanding sheet, the preselected
speed setting and the contact pressure.
Only immaculate sanding sheets achieve good sanding per-
formance and make the power tool last longer.
Be sure to apply consistent contact pressure in order to in-
crease the lifetime of the sanding sheets.
English | 9
Speed setting Sanding sheet
grit
2–4 From P180
4–6 From P120
4–6 From P100
1 609 92A 6A8 | (08.05.2021)