Troubleshooting - Hilti DD 350-CA Manual De Instrucciones

8 Troubleshooting

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