Hilti DD 160 Original Operating Instructions page 44

Fault
The machine doesn't start,
carbon brushes have been
changed, service indicator
lights.
The machine doesn't run and
the service indicator blinks.
en
The machine doesn't start, theft
protection indicator blinks yel-
low.
The motor runs. The diamond
core bit doesn't rotate.
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.
38
Possible cause
A fault has occurred in the power tool.
The machine has overheated.
Overload error.
The power tool has not been un-
locked (tools with optional theft pro-
tection system).
Gear selector doesn't engage.
The gearing is defective.
The diamond core bit is polished.
The diamond core bit is polished.
Water pressure / flow rate too high.
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 carriage is locked.
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
spindle are not tightened.
Excessive play at the carriage.
The core bit connection end is defect-
ive.
Remedy
If necessary, the power tool should be
repaired by Hilti Service.
Wait a few moments until the motor
has cooled down or allow it to run
under no load in order to speed up
the cooling-down process.
Switch the machine off and on again.
Use the TPS key to unlock the power
tool.
Move the gear selector until felt to
engage.
If necessary, the machine should be
repaired by Hilti Service.
Sharpen the diamond core bit on a
sharpening plate with water flowing.
The wrong type of core bit has been
used. Seek advice from Hilti.
Reduce the water flow rate by adjust-
ing the flow regulator.
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.
Unlock the carriage.
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 ne-
cessary.
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.