Hilti DD 120 Original Bedienungsanleitung Seite 41
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Malfunction
The service indicator shows
nothing.
The service indicator lights.
The service indicator blinks.
The drilling performance indi-
cator flashes red.
The theft protection indicator
blinks.
9.2
The diamond core drilling machine is in working order
Malfunction
The service indicator lights.
The diamond core drilling
machine doesn't achieve full
performance.
The diamond core bit doesn't
rotate.
274865
*274865*
Printed: 11.06.2018 | Doc-Nr: PUB / 5069516 / 000 / 06
Possible cause
Fault in the electronics.
Water in the motor.
The carbon brushes are worn out.
Motor speed error.
The motor has overheated.
Overload error.
The diamond core drilling machine
has not been unlocked (machines
with optional theft protection sys-
tem).
Possible cause
The carbon brush wear limit has
almost been reached. The diamond
core drilling machine will continue
to run for a few hours until it shuts
down automatically.
Supply network fault – undervolt-
age occurred.
The gear selector isn't engaged.
The diamond core bit has become
jammed in the base material.
Action to be taken
▶ Have the machine repaired by
Hilti Service.
▶ Allow the diamond core drilling
machine to dry out completely
in a warm, dry place.
▶ Replace the carbon brushes.
→ page 33
▶ Have the machine repaired by
Hilti Service.
▶ Wait a few minutes until the
motor has cooled down or
allow the diamond core drilling
machine to run under no load in
order to speed up the cooling
process. Switch the diamond
core drilling machine off and
then on again.
▶ Switch the diamond core drilling
machine off and then on again.
▶ Use the TPS key to unlock the
diamond core drilling machine.
Action to be taken
▶ Have the carbon brushes
replaced at the next opportunity.
▶ Check whether other power
consumers are disrupting the
power supply from the network
or generator.
▶ Check the length of the exten-
sion cord used.
▶ Operate the gear selector until
it engages.
▶ Use an open-end wrench to
release the diamond core bit:
Disconnect the supply cord plug
from the power outlet. Grip the
diamond core bit with a suitable
open-end wrench close to the
connection end and release the
diamond core bit by rotating it.
English
35
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