Inserting/Changing The Core Bit; Connecting The Water Cooling/Dust Extraction System; Starting Operation - Bosch GDB 180 WE Professional Manual Original

You can swivel the auxiliary handle (8) to any angle for a safe
work posture that minimises fatigue.
Turn the wing bolt for adjusting the auxiliary handle (5) anti-
clockwise and swivel the auxiliary handle (8) into the re-
quired position. Then retighten the wing bolt (5) by turning it
clockwise.
Before carrying out any work, make sure that the wing
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bolt is tightened. Loss of control can cause personal in-
jury.

Inserting/changing the core bit

Selecting the core bit
Bosch core bits are colour-coded:
– Wet core bits: Blue
– Dry core bits: Light grey
Inserting the core bit
Always examine the core bits before inserting them.
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Only use core bits that are free of defects. Using dam-
aged or deformed core bits may result in dangerous situ-
ations.
Clean the core bits before inserting them. Lightly grease the
thread of the core bit or spray it with corrosion inhibitor.
Screw a 1 1/4" UNC core bit (7) onto the drill spindle (6).
Check that the core bit is fitted securely. Core bits that
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are attached incorrectly or are not securely fixed in place
may come loose during operation, thereby putting you at
risk.
Removing the core bit
Wear protective gloves when changing the core bit.
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The core bit may become hot when the power tool is op-
erated for extended periods of time.
Detach the core bit (7) using an open-ended spanner (width
across flats 41 mm). When doing so, hold a second open-
ended spanner (width across flats 32 mm) on the two flats
of the drill spindle (6) to provide counterforce.
Connecting the water cooling/dust extraction
system
If wet or dry core bits are not sufficiently cooled when
drilling, the diamond segments can become damaged or the
core bit can jam in the drill hole. You should therefore ensure
that the water cooling system provides sufficient cooling
when wet drilling, or that the dust extraction system is func-
tioning properly when dry drilling.
When expanding an existing hole, this must be sealed care-
fully to allow the core bit to be sufficiently cooled.
Connected hoses, shut-off valves or accessories must
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not interfere with drilling.
Connecting the water cooling system
Attach the water connection adapter (14) to the claw coup-
ling (10) and tighten it by turning it clockwise as far as pos-
sible.
Close the water cutoff valve (12). Connect a water supply
line to the valve adapter (13). The water supply line can be
Bosch Power Tools
provided from a mobile pressurised water tank (accessory)
or a stationary water connection.
Connecting the dust extraction system
The dust from materials such as lead paint, some types of
wood, minerals and metal can be harmful to human health.
Touching or breathing in this dust can trigger allergic reac-
tions and/or cause respiratory illnesses in the user or in
people in the near vicinity.
Certain dusts, such as oak or beech dust, are classified as
carcinogenic, especially in conjunction with wood treatment
additives (chromate, wood preservative). Materials contain-
ing asbestos may only be machined by specialists.
– Use a dust extraction system that is suitable for the ma-
terial wherever possible.
– Provide good ventilation at the workplace.
– It is advisable to wear a P2 filter class breathing mask.
The regulations on the material being machined that apply in
the country of use must be observed.
Attach the extraction adapter (15) to the claw coupling (10)
and tighten it by turning it clockwise as far as possible.
Attach the extraction hose (17) of a wet/dry extractor that is
compatible with and recommended for this system (see "Ac-
cessories/replacement parts", page 14) to the extraction
outlet (16).
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
rating plate of the power tool.
Seek advice from the responsible structural engineer,
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architect or construction supervisor regarding
planned drill holes before starting work. Do not penet-
rate any reinforcements unless you have authorisa-
tion from a structural engineer.
When drilling holes that penetrate walls or ceilings, al-
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ways check the area concerned for obstacles. Close
off the work site and prevent the drill core from falling
by means of formwork.
Function test of the portable residual current device
(PRCD)
Before starting work, always check that the portable residual
current device (PRCD) (18) is functioning correctly:
– Press the TEST button on the residual current device
(PRCD). The red indicator light will switch off.
– Press the RESET button. It must now be possible to
switch the power tool on.
If the red indicator light does not switch off when you press
the TEST button or it switches off repeatedly when the
power tool is switched on, you must have the power tool
checked by an authorised Bosch after-sales service centre.
The power tool must not be used if the portable resid-
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ual current device (PRCD) is defective.
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1 609 92A 4SW | (03.04.2019)