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| English
Operation
Starting Operation
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Protect the measuring tool from moisture and direct
sunlight.
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Do not expose the measuring tool to any extreme tem-
peratures or fluctuations in temperature.
For example,
do not leave it in a car for extended periods of time. If it
has been subjected to significant fluctuations in temper-
ature, first allow the measuring tool to adjust to the ambi-
ent temperature and then always carry out an accuracy
check before continuing work (see "Accuracy Check of
the Measuring Tool", page 9).
The precision of the measuring tool may be compromised
if exposed to extreme temperatures or fluctuations in
temperature.
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Avoid substantial knocks to the measuring tool and
avoid dropping it.
Always carry out an accuracy check
before continuing work if the measuring tool has been
subjected to severe external influences (see "Accuracy
Check of the Measuring Tool", page 9).
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Switch the measuring tool off when transporting it.
The pendulum unit is locked when the tool is switched off,
as it can otherwise be damaged by big movements.
Switching on/off
To
switch on
the measuring tool, press the on/off
button
(4)
. The status indicator
(20)
lights up. Immediately
after switching on, the measuring tool sends a horizontal
laser line out of the front outlet aperture
(1)
.
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Do not direct the laser beam at persons or animals and
do not stare into the laser beam yourself (even from a
distance).
To
switch off
the measuring tool, press the on/off
button
(4)
again. The status indicator
(20)
goes out. The
pendulum unit is locked when the tool is switched off.
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Never leave the measuring tool unattended when
switched on, and ensure the measuring tool is
switched off after use.
Others may be blinded by the
laser beam.
Deactivating the Automatic Shut-Off Function
If no button on the measuring tool is pressed for approx.
30
minutes, the measuring tool will automatically switch off
to save energy.
To deactivate the automatic shut-off function, hold down the
horizontal mode button
(6)
for at least 3 seconds when
switching on the measuring tool. The laser beams will flash
briefly after 3 seconds if the automatic shut-off function is
deactivated.
To activate the automatic shut-off function, switch the meas-
uring tool off and on again (without holding down a button).
Operating Modes
The measuring tool has several operating modes, which you
can switch between at any time. The horizontal and vertical
modes can be switched on and off independently of each
other. After switching on, the measuring tool is in horizontal
mode with a laser line forwards.
All operating modes can be selected with both automatic lev-
elling or the pendulum lock.
Horizontal mode (GLL 5‑40 E) (see figure A)
In horizontal mode, the measuring tool sends out a hori-
zontal laser line pointing forwards.
To switch the horizontal laser line off or on, press the hori-
zontal mode button
(6)
.
Horizontal mode (GLL 8‑40 E) (see figures A and E)
The measuring tool has multiple horizontal modes:
– Horizontal laser line forwards
– Horizontal laser line forwards and to the right-hand side
– Horizontal laser lines to all four sides
To switch the horizontal mode on/off or to change the hori-
zontal mode, press the horizontal mode button
(6)
re-
peatedly until the required operating mode is reached.
Vertical mode and plumb point (see figures B–D)
The measuring tool has multiple vertical modes:
– Vertical laser line forwards
– Vertical laser line forwards and to the right-hand side
– Vertical laser line forwards and backwards
– Vertical laser lines to all four sides
A plumb point is additionally projected downwards in ver-
tical mode.
To switch the vertical mode on/off or to change the vertical
mode, press the vertical mode button
(3)
repeatedly until
the required operating mode is reached.
Receiver Mode
Receiver mode must be activated when working with the
laser receiver
(22)
, regardless of which operating mode is
selected.
In receiver mode, the laser lines flash at a very high fre-
quency, enabling them to be detected by the laser receiver
(22)
.
To switch on receiver mode, press the receiver mode
button
(5)
. The receiver mode indicator
(19)
lights up red.
When receiver mode is switched on, the laser lines are less
visible to the human eye. Therefore, switch receiver mode
off by pressing the receiver mode button
(5)
again to work
without a laser receiver. The receiver mode indicator
(19)
will go out.
Automatic Levelling
Working with automatic levelling
To work with automatic levelling, the pendulum lock
indicator
(21)
must not light up continuously. If necessary,
switch automatic levelling on again by pressing the pendu-
lum lock button
(2)
so that the pendulum lock indicator
flashes or goes out.
Position the measuring tool on a level, firm support or attach
it to a tripod
(24)
.
1 609 92A 58T | (07.08.2020)
Bosch Power Tools
