Care And Maintenance - Hilti DD 120 Mode D'emploi

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.

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.
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.
Check all external parts of the power tool for damage
at regular intervals and check that all controls operate
faultlessly. Do not operate the power tool if parts are
damaged or when the controls do not function faultlessly.
If necessary, the power tool should be repaired by Hilti
Service.
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.
8.4 Replace the carbon brushes. 10
NOTE
The indicator lamp with the wrench symbol lights up
when the carbon brushes need to be replaced.
DANGER
The machine may be operated, serviced and repaired
only by trained, authorized personnel. This personnel
must be particularly informed of any possible hazards.
Failure to observe the following instructions may result in
contact with dangerous electric voltage.
1. Disconnect the machine from the electric supply.
2. Open the carbon brush covers on the left-hand and
right-hand side of the motor.
3. Take note of how the carbon brushes are fitted and
how the conductors are positioned. Remove the
worn carbon brushes from the machine.
4. Fit the new carbon brushes just as the old ones were
fitted (spare part number: 39577 carbon brushes
AO ML 100‑120 V: 209487/209488).
NOTE Take care to avoid damaging the insulation
on the indicator lead as you insert the brushes.
5. Close the carbon brush covers on the left-hand and
right-hand side of the motor and tighten the retaining
screws.
NOTE The indicator lamp goes out after the carbon
brushes have been replaced.
8.5 Adjusting the play between rail and carriage
NOTE
Play between the rail and the carriage can be adjusted
by turning the carriage play adjustment screws.
en
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