Automatic Leveling; Working Advice - Bosch GLL3-300G Operating/Safety Instructions Manual

Automatic Shut-off
When no button on the tool is pressed for
approx. 120 minutes, the tool automatically
switches off to save the batteries.
To switch on the tool after automatic shut-off,
either slide the On/Off switch 7 to the "off"
position and then switch the tool on again or
press the operating mode button 6 once or
press the receiver mode button 4 once.
Deactivating the Automatic Shut-off
To deactivate the automatic shut-off, keep
the operating mode button 6 pressed for
at least 3 s (while the tool is switched on).
Deactivation of the automatic shut-off is
confirmed by brief flashing of the laser beams.
Activating the Automatic Shut-off
To activate the automatic shut-off, switch the
tool off and then on again.
Deactivating the Signal Tone
After the tool has been switched on,the audio
signal is always activated.
To deactivate/activate the audio signal, press
and hold the operating mode button 6 and
the receiver mode button 4 at the same time
for at least 3 s.
The audio signal activation and deactivation
are both confirmed by three short beeps.
Operating Modes
The tool has several operating modes
between which you can switch at any time:
– Generating a horizontal laser plane,
– Generating a vertical laser plane,
– Generating two vertical laser planes,
– Generating a horizontal laser plane as well
as two vertical laser planes.
After switching on, the tool generates
a horizontal laser plane. To change the
operating mode, press the operating mode
button 6.
All operating modes can be selected with or
without automatic leveling.
Receiver mode
Receiver mode must be activated to work with
the laser receiver 16 – regardless of which
operating mode is selected. In receiver mode
the laser lines flash at a very high frequency,
enabling them to be detected by the laser
receiver 16.
To switch on receiver mode, press button 4.
Indicator 5 will light up green.
2610056508 GLL3-300 03-20.indd 11
When receiver mode is switched on, the
laser lines are less visible to the human eye.
For this reason, switch receiver mode off by
pressing button 4 again to work without a
laser receiver. Indicator 5 will extinguish.

Automatic Leveling

Working with Automatic Leveling
Position the tool on a level and firm support,
attach it to the BM 1 positioning device 15 or
to the tripod 21.
When working with automatic leveling, push
the On/Off switch 7 to the "
After switching on, the leveling function
automatically compensates irregularities
within the self-leveling range of ±4°. The
leveling is finished as soon as the laser
beams do not move any more.
If automatic leveling is not possible, e.g.
because the surface on which the tool stands
deviates by more than 4° from the horizontal
plane, the laser lines begin to flash rapidly.
When the audio signal is activated, a fast-beat
signal sounds for 30 s (maximum). This alarm
is deactivated within 10 s after switching on, in
order to allow adjustment of the tool.
Set up the tool in level position and wait for
the self-leveling to take place. As soon as the
tool is within the self-leveling range of ±4°,
all laser beams light up continuously and the
audio signal is switched off.
In case of ground vibrations or position
changes during operation, the tool is
automatically leveled in again. To avoid
errors, check the position of the horizontal and
vertical laser line with regard to the reference
points upon releveling.
Working without Automatic Leveling
For working without automatic leveling, slide
the On/Off switch 7 to the "
When automatic leveling is switched off,
indicator 6 lights up red and for the first 30 s
laser beams flash slowly.
When the automatic leveling is switched off,
the tool can be held by hand or placed on an
inclined surface. In cross-line operation, the
two laser lines do not necessarily run at a right
angle to each other.

Working Advice

• Always use the center of the laser line
for marking. The width of the laser line
changes with the distance.
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on" position.
on" position.
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