Procedure In The Event Of The Core Bit Jamming; Using An Open-End Wrench To Free The Core Bit; Using The Hand Wheel To Free The Core Bit - Hilti DD 120 Manual De Instrucciones

6.4 Operating diamond core drilling machine without a wet-type industrial vacuum extractor
1. Slowly open the water flow regulator until the water flows at the desired rate.
The diamond core drilling machine can be operated with or without water collection system. With
the water collection system, the cooling water is drained away through a hose, without the water
collection system the water runs off in an uncontrolled manner. For operation with water collection
system, first install the water collection system → page 30.
In both applications, upward drilling is not allowed.
2. Push the ON/OFF switch to the "I" position.
3. Release the carriage lock.
4. Turn the hand wheel until the diamond core bit is in contact with the work surface.
5. When you start drilling apply only light pressure until the core bit has centered itself and only then,
increase the pressure against the working surface.
6. Observe the drilling performance indicator.
Initially, the drilling performance indicator shows orange. Optimum drilling performance is achieved
when the drilling performance indicator shows green. Reduce the pressure against the work
surface if the drilling performance indicator shows red.
6.5 Operating diamond core drilling machine with a wet-type industrial vacuum extractor
WARNING
Danger of electric shock! There is a possibility of water flowing over the motor and cover if the vacuum
removal system is faulty.
▶ Cease operations immediately if the vacuum removal system is not working.
1. Install the water collection system → page 30 and connect the wet-type industrial vacuum extractor.
2. Switch on the wet-type industrial vacuum extractor; do not use automatic mode.
3. Slowly open the water flow regulator until the water flows at the desired rate.
4. Push the ON/OFF switch to the "I" position.
5. Release the carriage lock.
6. Turn the hand wheel until the diamond core bit is in contact with the work surface.
7. When you start drilling apply only light pressure until the core bit has centered itself and only then,
increase the pressure against the working surface.
8. Observe the drilling performance indicator.
Initially, the drilling performance indicator shows orange. Optimum drilling performance is achieved
when the drilling performance indicator shows green. Reduce the pressure against the work
surface if the drilling performance indicator shows red.
6.6

Procedure in the event of the core bit jamming

If the bit jams the safety clutch disengages. The electronic control system then switches the motor off and
subsequently on again; this is done twice without manual intervention by the user. If this does not free the
core bit, the electronic control system switches the motor off for 90 seconds. You can free a jammed bit
manually, as follows:
6.6.1

Using an open-end wrench to free the core bit

1. Unplug the supply cord from the power outlet.
2. Grip the diamond core bit with a suitable open-end wrench close to the connection end and turn the
diamond core bit to free it.
3. Plug the supply cord into the power outlet.
4. Resume the drilling operation.
6.6.2

Using the hand wheel to free the core bit

1. Unplug the supply cord from the power outlet.
2. Free the core bit from the base material by turning the hand wheel.
3. Plug the supply cord into the power outlet.
4. Resume the drilling operation.
32 English
Printed: 09.08.2019 | Doc-Nr: PUB / 5069516 / 000 / 07
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