Care And Maintenance - Hilti DD 120 Bedienungsanleitung

7. Apply only light pressure until the diamond core bit
has centered itself and then increase the pressure.
8. Regulate the contact pressure while observing the
drilling performance indicator.
NOTE The drilling performance indicator lights or-
ange after switching on. Optimum drilling perform-
ance is achieved when the drilling performance in-
dicator shows a green light. If the drilling perform-
en
ance indicator shows a red light, reduce the pressure
applied to the core bit.
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.

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.
34
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.
7.7.2 Using the spider wheel to release the core bit
1. Disconnect the supply cord plug from the power
outlet.
2. Use the spider wheel to rotate the core bit and
release it from the base material.
3. Plug the machine's supply cord into the power out-
let.
4. Resume the drilling operation.
7.8 Dismantling
CAUTION
Disconnect the supply cord plug from the power out-
let.
1. For instructions on removing the diamond core bit,
please refer to the section "Removing the diamond
core bit".
2. Remove the core if necessary.
3. Detach the drill stand from the base material.
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.
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.
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