Hilti DD 150-U Manual De Instrucciones página 49

Fault
The motor runs. The diamond
core bit doesn't rotate.
Drilling speed drops.
en
The motor cuts out.
The handwheel turns but does-
n't engage.
Water escapes at the water
swivel or gear housing.
No water flows.
The diamond core bit cannot be
fitted into the chuck.
Water escapes from the chuck
during operation.
Excessive play in the drilling
system.
42
Possible cause
Gear selector doesn't engage.
The gearing is defective.
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 defective.
The slip clutch is disengaging prema-
turely or slipping.
The carriage is locked.
The water flow rate is too low.
The machine has stalled.
The machine is too hot. The motor
overheating protection system has
been activated.
The electronics are defective.
The cooling fan is defective.
The retaining pin is broken.
The water pressure is too high.
The shaft seal is defective.
The filter or water flow indicator is
blocked.
The core bit connection end or chuck
is dirty or damaged.
The core bit is not screwed securely
into the chuck.
The core bit 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 clamping
spindle are not tightened.
Excessive play at the carriage.
The core bit connection end is defect-
ive.
Remedy
Move the gear selector until felt to
engage.
If necessary, the machine should be
repaired by Hilti Service.
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.
If necessary, the machine should be
repaired by Hilti Service.
Unlock the carriage.
Adjust (open) the water flow regulator.
Check the water supply.
Guide the machine straight.
Relieve the load on the machine and
press the switch several times to re-
start.
The machine should be repaired by
Hilti Service.
The machine should be repaired by
Hilti Service.
Fit a new retaining pin.
Reduce the water pressure.
The machine should be repaired by
Hilti Service.
Remove the filter or water flow indic-
ator and flush it through.
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 clamp-
ing spindle.
Adjust the play between rail and car-
riage.
See section: 8.6 Adjusting the play
between rail and carriage
Check the connection end and re-
place it if necessary.