Troubleshooting - Hilti DD 110-W Manual De Instrucciones

3. Take note of how the carbon brushes are fitted.
Remove the worn carbon brushes from the machine.
4. Fit the new carbon brushes just as the old ones
were fitted (spare part numbers: 100‑127 V: 39577;
220‑240 V: 39576).
NOTE Take care to avoid damaging the insulation
on the indicator lead as you insert the brushes.

9 Troubleshooting

Fault
The machine doesn't start.
The machine doesn't start and
the service indicator lights.
The machine doesn't start,
carbon brushes have been
changed, service indicator
lights.
The service indicator lights.
The service indicator blinks.
The machine doesn't start, theft
protection indicator blinks yel-
low.
The motor runs. The diamond
core bit doesn't rotate.
The rate of drilling progress de-
creases.
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.
Water in the machine.
The carbon brushes are worn.
A fault has occurred in the power tool.
The carbon brushes are worn; the
machine will continue to run for a few
hours.
Motor speed error.
The power tool has not been un-
locked (tools with optional theft pro-
tection system).
The gear selector doesn't engage.
The gearing is defective.
The diamond core bit is polished.
The diamond core bit is polished.
The core is stuck in the core bit.
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, PRCD 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 PRCD,
and have them replaced by a qualified
electrician if necessary.
The machine should be repaired by
Hilti Service.
Dry the machine.
The machine should be repaired by
Hilti Service.
Replacing the carbon brushes
See section: 8.4 Replacing the carbon
brushes 8
If necessary, the power tool should be
repaired by Hilti Service.
The carbon brushes should be
changed.
See section: 8.4 Replacing the carbon
brushes 8
Have the appliance repaired by Hilti
Service.
Use the TPS key to unlock the power
tool.
Move the gear selector until felt to
engage.
The machine should be repaired by
Hilti Service.
Sharpen the core bit by drilling into a
sharpening plate.
The wrong type of core bit has been
used. Seek advice from Hilti.
Remove the core.
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