Hilti DD 350 Manual Del Usuario página 48

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Malfunction
The diamond core bit doesn't
rotate.
The handwheel can be turned
without resistance.
The diamond core bit can't be
fitted into the chuck.
Water escapes at the water
swivel or gear housing.
Water escapes from the
chuck during operation.
The drilling system has too
much play.
38 English
Printed: 02.11.2017 | Doc-Nr: PUB / 5145256 / 000 / 04
Possible cause
The diamond core bit has become
jammed in the base material.
The shear pin is broken.
The core bit connection end or
chuck is dirty or damaged.
The water pressure is too high.
The diamond core bit isn't securely
tightened in the chuck.
The core bit connection end /
chuck is dirty.
The chuck seal or connection end
is defective.
The diamond core bit isn't securely
tightened in the chuck.
The core bit connection end /
chuck is defective.
The connection between the dia-
mond core drilling machine and the
carriage or spacers is loose.
The carriage has too much play.
Screws / bolts on the drill stand are
loose.
The drill stand is inadequately fas-
tened.
Action to be taken
▶ Use an open-end wrench to
release the diamond core bit:
Disconnect the supply cord plug
from the power outlet. Grip the
diamond core bit with a suitable
open-end wrench close to the
connection end and release the
diamond core bit by rotating it.
Stand-guided drilling
▶ Turn the handwheel and try to
release the diamond core bit
by moving the carriage up and
down.
▶ Replace the shear pin.
▶ Clean and grease the connec-
tion end and/or the chuck or
replace these parts.
▶ Reduce the water pressure.
▶ 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.
▶ Clean and grease the connec-
tion end and/or the chuck.
▶ Check the seal and replace it if
necessary.
▶ 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.
▶ Check the connection end and
chuck and replace them if
necessary.
▶ Check the connection and,
if necessary, refasten the
diamond core drilling machine.
▶ Adjust the play between the rail
and carriage. → page 36
▶ Check the security of screws
/ bolts on the drill stand and
tighten them if necessary.
▶ Fasten the drill stand more
securely.