Hilti DD 120 Mode D'emploi page 17

WARNING If the indicator continues to light, fur-
4.
ther operation of the machine is not permissi-
ble.Have the machine repaired by trained personnel
using genuine Hilti spare parts.
Press the "I" or "Reset" button on the ground fault
circuit interrupter (GFCI).
The indicator must light.
7.3 Drilling without use of the water collection
system and industrial vacuum cleaner
WARNING
Water must not be allowed to run over the motor and
cover.
WARNING
Water drainage is uncontrolled. Overhead drilling is not
permissible.
1. Slowly open the water flow regulator until the desired
volume of water is flowing.
2. Press the on/off switch on the machine (position "I").
The drilling performance indicator lights orange.
3. Release the carriage brake.
4. Turn the handwheel until the diamond core bit is in
contact with the base material.
5. Apply only light pressure until the diamond core bit
has centered itself and then increase the pressure.
6. Regulate the contact pressure while observing the
drilling performance indicator.
NOTE The drilling performance indicator lights or-
ange after switching on. Optimum drilling perfor-
mance is achieved when the drilling performance
indicator shows a green light. If the drilling per-
formance indicator shows a red light, reduce the
pressure applied to the core bit.
7.4 Drilling with use of the water collection system
(accessory)
WARNING
Water must not be allowed to run over the motor and
cover.
CAUTION
The water is drained through a hose. Overhead drilling
is not permissible.
1. Slowly open the water flow regulator until the desired
volume of water is flowing.
2. Press the on/off switch on the machine (position "I").
The drilling performance indicator lights orange.
3. Release the carriage brake.
4. Turn the handwheel until the diamond core bit is in
contact with the base material.
5. Apply only light pressure until the diamond core bit
has centered itself and then increase the pressure.
6. Regulate the contact pressure while observing the
drilling performance indicator.
NOTE The drilling performance indicator lights or-
ange after switching on. Optimum drilling perfor-
mance is achieved when the drilling performance
indicator shows a green light. If the drilling per-
formance indicator shows a red light, reduce the
pressure applied to the core bit.
en
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