8 Troubleshooting
Fault
Possible cause
Remedy
The machine doesn’t start.
Interruption in the electric supply.
Plug in another electric appliance and
check whether it works. Check the
plug connections, supply cord and
extension cord, PRCD and electric
supply.
The supply cord or plug is defective.
Have it checked by a trained electri-
cian and replaced if necessary.
The machine doesn’t start
and the temperature or
over/undervoltage indicator
lights.
The machine has overheated.
Switch the machine off and then on
again. Check the water supply. After
cooling down the machine is again
ready for use.
The machine doesn’t start
and the temperature or
over/undervoltage indicator
blinks.
Fault in the electric supply.
Switch the machine off and then on
again. Check the electric supply
(especially when a generator or trans-
former is used).
The rate of drilling progress de-
creases.
The diamond core bit is polished.
Sharpen the diamond core bit on a
sharpening plate with water flowing.
The diamond core bit is polished.
The wrong type of core bit has been
used. Seek advice from Hilti.
Water pressure / flow rate too high.
Reduce the water flow rate by adjust-
ing the flow regulator.
The core is stuck in the core bit.
Remove the core.
Maximum drilling depth is reached.
Remove the core and use a core bit
extension.
The diamond core bit is damaged.
Check the diamond core bit for dam-
age and replace it if necessary.
The water flow rate is too low.
Adjust (open) the water flow regulator.
Check the water supply.
Water escapes at the water
swivel or gear housing.
The water pressure is too high.
Reduce the water pressure.
The shaft seal is defective.
The machine should be repaired by
Hilti Service.
The diamond core bit cannot be
fitted into the chuck.
The connection end / chuck is dirty or
damaged.
Clean the connection end /chuck or
replace if necessary.
Water escapes from the chuck
during operation.
The core bit is not screwed securely
into the chuck.
Tighten it securely.
The connection end / chuck is dirty.
Clean the connection end / chuck.
The chuck or connection end seal is
defective.
Check the seal and replace it if ne-
cessary.
Excessive play in the drilling
system.
The core bit is not screwed securely
into the chuck.
Tighten it securely.
The leveling screws or anchor spindle
are not tightened.
Tighten the leveling screws or the an-
chor spindle.
Excessive play at the carriage.
See section: 7.2 Adjusting the play
between rail and carriage
19
The core bit connection end is defect-
ive.
Check the connection end and re-
place it if necessary.
The bolt at the top end of the brace
and/or at the pivoting joint at the bot-
tom end of the rail is loose.
Tighten the bolts.
The machine’s mounting mechanism
is loose.
Tighten the machine’s mounting
mechanism.
Excessive play at the chuck.
Check that the chuck runs true (no
wobble) and replace if necessary.
en
35
Printed: 03.12.2014 | Doc-Nr: PUB / 5209037 / 000 / 00
Summary of Contents for DD 350-CA
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