Hilti DD 30-W Original Operating Instructions page 52

Malfunction
The diamond core bit can't be
fitted into the chuck.
The diamond core bit has too
much play.
No water is flowing.
Water escapes from the
chuck during operation.
8.2 The diamond core drilling machine is not in working order
Malfunction
The service indicator shows
nothing.
The service indicator lights.
The service indicator blinks.
9 Disposal
Most of the materials from which Hilti tools and appliances are manufactured can be recycled. The
materials must be correctly separated before they can be recycled. In many countries, your old tools,
machines or appliances can be returned to Hilti for recycling. Ask Hilti Service or your Hilti representative
for further information.
▶ Disposal of electric tools or appliances together with household waste is not permissible.
9.1 Disposal of drilling slurry
Disposal of drilling slurry directly into rivers, lakes or the sewerage system without suitable pretreatment
presents environmental problems.
44 English
Printed: 20.12.2016 | Doc-Nr: PUB / 5283477 / 000 / 03
Possible cause
The chuck operating lever isn't fully
open.
The connection end is defective.
The chuck lever is not closed.
The filter or water flow indicator is
blocked.
The core bit connection end /
chuck is dirty.
The chuck seal is defective.
Possible cause
The PRCD isn't switched on.
Interruption in the electric supply.
Water in the motor.
The carbon brushes are worn out.
The motor has overheated (e.g.
due to excessive lateral core bit
friction and/or excessive contact
pressure).
Action to be taken
▶ Open the lever as far as it will
go.
▶ Check the connection end and
replace it if necessary.
▶ Close the chuck lever.
▶ Remove the filter or water flow
indicator and flush it through.
▶ Clean the connection end or the
chuck.
▶ Check the seal and replace it if
necessary.
Action to be taken
▶ Check that the PRCD is
functioning and switch it on.
▶ Plug in another electric tool or
appliance and check whether it
works.
▶ Check the plug connections,
supply cord, power supply line
and main supply fuse.
▶ Allow the diamond core drilling
machine to dry out completely
in a warm, dry place.
▶ Replace the carbon brushes.
→ page 42
▶ 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.
▶ Guide the diamond core drilling
machine carefully, keeping
it straight and/or reduce the
contact pressure.