Disposal - Hilti DD 120 Mode D'emploi

Fault
Drilling speed drops.
The handwheel turns but does-
n't engage.
Water escapes at the water
swivel or gear housing.
The diamond core bit cannot be
fitted into the chuck.
Water escapes from the chuck
during operation.
Excessive play in the drilling
system.

10 Disposal

Most of the materials from which Hilti machines or appliances are manufactured can be recycled. The materials must
be correctly separated before they can be recycled. In many countries, Hilti has already made arrangements for taking
back old machines and appliances for recycling. Ask Hilti customer service or your Hilti representative for further
information.
Recommended pretreatment for disposal of drilling slurry
NOTE
The disposal of drilling slurry directly into rivers, lakes or the sewerage system without suitable pretreatment presents
environmental problems. Ask the local public authorities for information about current regulations.
1. Collect the drilling slurry (e.g. using a wet-type industrial vacuum cleaner)
2. Allow the drilling slurry to settle and dispose of the solid material at a construction waste disposal site (the
addition of a flocculent may accelerate the separation process).
3. The remaining water (alkaline, pH value > 7) must be neutralized by the addition of an acidic neutralizing agent or
diluted with a large volume of water before it is allowed to flow into the sewerage system.
Possible cause
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 brake is engaged.
The water flow rate is too low.
The retaining pin is broken.
The water pressure is too high.
The shaft seal is defective.
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 spin-
dle are not tightened.
Excessive play at the carriage.
The core bit connection end is defec-
tive.
Remedy
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.
Release the brake.
Adjust (open) the water flow regulator.
Check the water supply.
Fit a new retaining pin.
Reduce the water pressure.
The machine should be repaired by
Hilti Service.
Clean the connection end /chuck or
replace if necessary.
Tighten it securely.
Clean the connection end / chuck.
Check the seal and replace it if nec-
essary.
Tighten it securely.
Tighten the leveling screws or clamp-
ing spindle.
Adjust the play between rail and car-
riage.
See section: 8.5 Adjusting the play
between rail and carriage
Check the connection end and re-
place it if necessary.
en
17