Troubleshooting - Hilti DD EC-1 Mode D'emploi

Troubleshooting

Problem
Machine doesn't start
Motor runs but the core bit
doesn't rotate.
Rate of drilling progress
decreases
The motor runs up to speed
and then cuts out.
No flow of water when
operated in automatic mode
No flow of water when
operated in bypass mode
Water leaks from the gear
housing
The core bit cannot be inserted
in the chuck
Water leaks from the chuck
Motor cuts out
10
Possible cause
Fault in power supply
Supply cord or plug defective
Switch defective
Gearing defective
Water pressure/water flow rate
too high
Core bit connection end dirty
or not properly engaged
Core bit defective
Gearing defective
Core bit cutting edge polished
Electronics defective
Cooling fan defective
Filter or water flow indicator
blocked
Magnet valve defective
Filter or water flow indicator
blocked
Water swivel shaft seal defective The machine should be repaired at a Hilti
Chuck operating lever not fully
open
Core bit connection end or
chuck dirty or damaged
Core bit connection end or
chuck dirty
Chuck seal defective
Motor to warm
Solution
Plug in another electric appliance and
check whether it works.
The cord should be checked and replaced
if necessary by an electrical specialist.
The switch should be checked and replac-
ed if necessary by an electrical specialist.
The machine should be repaired at a Hilti
service center.
Reduce the water flow rate by turning the
regulating wheel.
Clean the connection end and insert the
core bit correctly.
Check the core bit for damage and replace
it if necessary.
The machine should be repaired at a Hilti
service center.
Resharpen the core bit on a sharpening
plate or similar abrasive material.
The machine should be repaired at a Hilti
service center.
The machine should be repaired at a Hilti
service center.
Remove the filter or water flow indicator
and flush it through.
Drill in bypass mode.
The machine should be repaired at a Hilti
service center.
Remove the filter or water flow indicator
and flush it through.
service center.
Open the lever as far as it will go.
Clean the connection end and chuck or
replace if necessary.
Clean the connection end and chuck.
Check the seal and replace it if necessary.
Release pressure on core bit.
Switch on the tool several times until runs
a full RPM.