Hilti DD 150-U Manual De Instrucciones página 64

Malfunction
The rate of drilling progress
decreases.
The hand wheel can be
turned without resistance.
The diamond core bit cannot
be fitted into the chuck.
Water escapes at the water
swivel or gear housing.
Water escapes at the chuck
during operation.
No water is flowing.
The drilling system has too
much play.
56 English
Possible cause
High steel content (indicated by
clear water containing metal cut-
tings).
The diamond core bit is defective.
Wrong gear selected.
Contact pressure is too low.
The machine has too little power.
The diamond core bit is polished.
The water flow rate is too high.
The water flow rate is too low.
The carriage lock is engaged.
Dust is hindering drilling progress.
The shear pin is broken.
The core bit connection end or
chuck is dirty or damaged.
The water pressure is too high.
The rotary shaft seal is worn out.
The diamond core bit isn't securely
tightened in the chuck.
The core bit connection end /
chuck is dirty.
The seal at the chuck or at the
connection end is defective.
The filter or water flow indicator is
blocked.
The diamond core bit isn't securely
tightened in the chuck.
The core bit connection end /
chuck is defective.
The carriage has too much play.
Action to be taken
▶ Select a more suitable diamond
core bit specification.
▶ Check the diamond core bit
for damage and replace it if
necessary.
▶ Select the right gear.
▶ Increase the contact pressure.
▶ Select the next lower gear.
▶ Sharpen the diamond core bit
by drilling into a sharpening
plate.
▶ Reduce the water flow rate
by adjusting the water flow
regulator.
▶ Check the water supply to the
diamond core bit respectively
increase the water flow rate by
adjusting the water regulator.
▶ Release the carriage locking
mechanism.
▶ Use a suitable dust removal
system.
▶ Replace the shear pin.
▶ Clean and grease the connec-
tion end and/or the chuck or
replace these parts.
▶ Reduce the water pressure.
▶ Replace the rotary shaft seal.
▶ Tighten the diamond core bit
securely.
▶ Remove the diamond core bit.
Rotate the diamond core bit
approx. 90° about its own axis.
Refit the diamond core bit.
▶ Clean and grease the connec-
tion end and/or the chuck.
▶ Check the seal and replace it if
necessary.
▶ Remove the filter or water flow
indicator and flush it through.
▶ Tighten the diamond core bit
securely.
▶ Remove the diamond core bit.
Rotate the diamond core bit
approx. 90° about its own axis.
Refit the diamond core bit.
▶ Check the connection end and
chuck and replace them if
necessary.
▶ Adjust the play between the rail
and carriage. → page 46
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