It is essential that the dust shield is replaced if the sealing
lip is found to be damaged. Push the tip of a screwdriver
under the edge of the dust shield and prise it out toward
the front. Clean the area of the chuck in contact with dust
shield and then fit a new dust shield. Press it in firmly
until it engages.
8.4 Maintenance
WARNING
Repairs to the electrical section of the power tool may
be carried out only by trained electrical specialists.
Check all external parts of the power tool for damage
at regular intervals and check that all controls operate
faultlessly. Do not operate the power tool if parts are
damaged or when the controls do not function faultlessly.
If necessary, the power tool should be repaired by Hilti
Service.
8.5 Checking the power tool after care and
maintenance
After carrying out care and maintenance work on the
power tool, check that all protective and safety devices
are fitted and that they function faultlessly.
9 Troubleshooting
Fault Possible cause Remedy
The power tool doesn’t start.
Interruption in the electric supply. Plug in another electric appliance and
check whether it works.
Supply cord or plug defective. Have the supply cord and plug
checked by a trained electrical
specialist and replaced if necessary.
Other electrical fault. Have it checked by a trained electrical
specialist.
The carbon brushes are worn. Have the supply cord and plug
checked by a trained electrical
specialist and replaced if necessary.
No hammering action. The power tool is too cold. Allow the power tool to warm up to
the minimum operating temperature.
See section: 7.2.1 Working at low
temperatures
The function selector switch is set to
“Drilling without hammering”.
Set the function selector switch to
“Hammer drilling”.
The forward/reverse switch is set to
reverse rotation.
Set the forward/reverse switch to for-
ward rotation.
The power tool doesn’t achieve
full power.
The extension cord’s conductor cross
section is inadequate.
Use an extension cord with an ad-
equate conductor cross section.
(Please refer to the “Description” sec-
tion.)
The control switch is not pressed
fully.
Press the control switch as far as it
will go.
The drill bit doesn’t rotate.
The function selector switch is not
engaged or is in the “Chiseling” or
“Chisel adjustment” position.
When the motor has stopped, turn the
function control switch to the “Drilling
without hammering” or “Hammer
drilling” position.
The drill bit can’t be released. The chuck is not pulled back fully. Pull the chuck back as far as it will go
and remove the insert tool.
The drill bit makes no progress. The forward/reverse switch is set to
reverse rotation.
Set the forward/reverse switch to for-
ward rotation.
en
22
Printed: 19.05.2014 | Doc-Nr: PUB / 5071207 / 000 / 02
(42 pages)
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