Hilti DD 150?U, Manual

Page: 35 / 496

*2204402*
2204402 English 27
Malfunction Possible cause Action to be taken
The rate of drilling progress
decreases.
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 respectively
increase the water flow rate by
adjusting the water regulator.
The carriage lock is engaged.
▶
Release the carriage locking
mechanism.
Dust is hindering drilling progress.
▶
Use a suitable dust removal
system.
The hand wheel can be
turned without resistance.
The shear pin is broken.
▶
Replace the shear pin.
The diamond core bit cannot
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.
The rotary shaft seal is worn out.
▶
Replace the rotary shaft seal.
Water escapes at the chuck
during operation.
The diamond core bit isn’t securely
tightened in the chuck.
▶
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.
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.
No water is flowing. The filter or water flow indicator is
blocked.
▶
Remove the filter or water flow
indicator and flush it through.
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 diamond 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 17