Care And Maintenance; Troubleshooting - Hilti DD110-W Manual De Instrucciones

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.
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

9 Troubleshooting

Fault
The machine doesn't start.
damaged or when the controls do not function faultlessly.
If necessary, the power tool should be repaired by Hilti
Service.
8.4 Replacing the carbon brushes 8
NOTE
The indicator lamp with 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 specially informed of any possible hazards.
Failure to observe the following instructions may result in
contact with dangerous electric voltage.
1.
2.
3.
4.
5.
8.5 Checking the power tool after care and
After carrying out care and maintenance, check that all
protective and safety devices are fitted and that they
function faultlessly.
Possible cause
Interruption in the electric supply.
The on/off switch is defective.
Interruption in the electric supply.
The electronics are defective.
Disconnect the machine from the electric supply.
Open the carbon brush covers on the left-hand and
right-hand side of the motor.
Take note of how the carbon brushes are fitted.
Remove the worn carbon brushes from the machine.
Fit the new carbon brushes just as the old ones were
fitted (spare part numbers: 100‑127 V: 39577).
NOTE Take care to avoid damaging the insulation
on the indicator lead as you insert the brushes.
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.
maintenance
Remedy
Plug in another electric appliance and
check whether it works. Check the
plug connections, supply cords and
extension cords, GFCI and electric
supply.
The machine should be repaired by
Hilti Service.
Check the supply cord and vacuum
cleaner (if applicable), the extension
cord, supply cord plug and GFCI, and
have them replaced by a qualified
electrician if necessary.
The machine should be repaired by
Hilti Service.
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