22 English
Malfunction Possible cause Action to be taken
The drilling speed is decreas-
ing.
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 water flow rate is too high. ▶ Reduce the water flow rate
by adjusting the water flow
regulator.
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 brake has been applied. ▶ Release the brake.
Safety clutch disengages too soon
or is slipping.
▶ Have the machine repaired by
Hilti Service.
The handwheel can be turned
without resistance.
The split pin is broken. ▶ Replace the split pin.
The diamond core bit can’t be
fitted into the chuck.
The core bit connection end or
chuck is dirty or damaged.
▶ Clean and grease the connec-
tion end and/or the chuck or
replace these parts.
Water escapes at the water
swivel or gear housing.
The water pressure is too high. ▶ Reduce the water pressure.
Water escapes from the
chuck during operation.
The diamond core bit isn’t securely
tightened in the chuck.
▶ Tighten the diamond core bit
securely.
▶ Remove the core bit. Rotate the
diamond core bit approx. 90°
about its own axis. Refit the
diamond core bit.
The core bit connection end /
chuck is dirty.
▶ Clean and grease the connec-
tion end and/or the chuck.
The seal at the chuck or at the
connection end is defective.
▶ Check the seal and replace it if
necessary.
The drilling system has too
much play.
The diamond core bit isn’t securely
tightened in the chuck.
▶ Tighten the diamond core bit
securely.
▶ Remove the core bit. Rotate the
diamond core bit approx. 90°
about its own axis. Refit the
diamond core bit.
The core bit connection end /
chuck is defective.
▶ Check the connection end and
chuck and replace them if
necessary.
The carriage has too much play. ▶ Adjust the play between the rail
and carriage. → page 19
Printed: 24.05.2018 | Doc-Nr: PUB / 5431649 / 000 / 00
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