Hilti DD 120 Mode D'emploi page 19

7.6 Switching off 9
WARNING
Exercise caution when drilling overhead : The diamond
core bit fills with water during overhead drilling. As a
first step, carefully allow the water to drain away
after completing overhead drilling. This is done by
disconnecting the water supply from the water flow
regulator and draining the water by opening the water
flow regulator. Do not allow the water to run over the
motor and cover.
1. Close the water flow regulator.
2. Remove the diamond core bit from the hole.
3. Engage the carriage brake.
4. Switch the drilling machine off.
5. Switch off the industrial vacuum cleaner.
7.7 Procedure in the event of the core bit sticking
The safety clutch releases in the event of the core bit
binding and sticking. Following this, the motor is switched
off by the electronic control system. If the user takes no
action, the electronic control system switches the motor
on twice automatically. If the core bit still can't be freed,
the electronic control system switches the motor off for
90 seconds. The core bit can be released by taking the
following action:
7.7.1 Using an open-end wrench to release the
core bit
1. Disconnect the supply cord plug from the power
outlet.
2. Grip the core bit with a suitable open-end wrench
close to the connection end and release the core bit
by rotating it.
3. Plug the machine's supply cord into the power out-
let.
4. Resume the drilling operation.
8 Care and maintenance
CAUTION
Disconnect the supply cord plug from the power out-
let.
8.1 Care of cutting tools and metal parts
Remove any dirt adhering to the surface of cutting tools,
the chuck and drive spindle and protect their surfaces
from corrosion by rubbing them with an oily cloth from
time to time.
Always keep the connection end clean and lightly
greased.
8.2 Care of the machine
CAUTION
Keep the machine, especially its grip surfaces, clean
and free from oil and grease. Do not use cleaning
agents which contain silicone.
All manuals and user guides at all-guides.com
7.7.2 Using the spider wheel to release the core bit
1.
2.
3.
4.
7.8 Dismantling
CAUTION
Disconnect the supply cord plug from the power out-
let.
1.
2.
3.
7.8.1 Removing the system as a unit
NOTE
If you wish to remove the drilling system as a complete
unit (without first removing the core bit) it is recommended
that the drive unit is lowered on the rail (after switching
off) until in contact with the base material. This will help
to prevent it tipping over.
7.9 Disposing of drilling slurry
Please refer to the section "Disposal".
7.10 Transport and storage
Open the water flow regulator before putting the power
tool into storage.
CAUTION
When temperatures drop below zero, check to ensure
that no water remains in the power tool.
The outer casing of the machine is made from impact-
resistant plastic.
Never operate the machine when the ventilation slots are
blocked. Clean the ventilation slots carefully using a dry
brush. Do not permit foreign objects to enter the interior of
the machine. Clean the outside of the machine at regular
intervals with a slightly damp cloth. Do not use a spray,
steam pressure cleaning equipment or running water for
cleaning. This may negatively affect the electrical safety
of the machine.
8.3 Maintenance
WARNING
Repairs to the electrical section of the machine may
be carried out only by trained electrical specialists.
Disconnect the supply cord plug from the power
outlet.
Use the spider wheel to rotate the core bit and
release it from the base material.
Plug the machine's supply cord into the power out-
let.
Resume the drilling operation.
For instructions on removing the diamond core bit,
please refer to the section "Removing the diamond
core bit".
Remove the core if necessary.
Detach the drill stand from the base material.
en
15