Hilti DD 350, Manual

Page: 47 / 664

English 37
3. Open the water flow regulator.
4. Set the 3-way valve to Wet drilling .
5. Use compressed air (max. 3 bar) to blow the water out of the water circuit.
8 Troubleshooting
If the trouble you are experiencing is not listed in this table or you are unable to remedy the problem by
yourself, please contact Hilti Service.
8.1 The diamond core drilling machine is in working order
Malfunction Possible cause Action to be taken
The service indicator lights.
Service interval reached.
▶
Bring the diamond core drilling
machine to Hilti at your earliest
convenience.
The service indicator blinks.
Service interval exceeded.
▶
Bring the diamond core drilling
machine to Hilti .
The drilling speed is decreas-
ing.
Maximum drilling depth has been
reached.
▶
Remove the core and use a core
bit extension.
The core is stuck in the diamond
core bit.
▶
Remove the core.
Wrong core bit specification for the
base material.
▶
Select a more suitable diamond
core bit specification.
High steel content (indicated by
clear water containing metal cut-
tings).
▶
Select a more suitable diamond
core bit specification.
The diamond core bit is defective.
▶
Check the diamond core bit
for damage and replace it if
necessary.
Wrong gear selected.
▶
Select the right gear.
Contact pressure is too low.
▶
Increase the contact pressure.
The machine has too little power.
▶
Select the next lower gear.
The diamond core bit is polished.
▶
Sharpen the diamond core bit
by drilling into a sharpening
plate.
The volume of water is too high.
▶
Reduce the volume of water us-
ing the water volume regulator
(ensure that the volume of water
is at least 0.5 l/min as required).
The water flow rate is too low.
▶
Check the water supply to
the diamond core bit or,
respectively, increase the water
flow by adjusting the water flow
regulator.
The carriage lock is engaged.
▶
Release the carriage locking
mechanism.
Printed: 02.11.2017 | Doc-Nr: PUB / 5145256 / 000 / 04