Troubleshooting - Hilti TE 7-C Operating Instructions Manual

8.3 Cleaning or replacing the dust shield
Clean the dust shield on the chuck with a dry, clean
cloth at regular intervals. Clean the sealing lip by wiping it
carefully and then grease it again lightly with Hilti grease.
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
en
shield and then fit a new dust shield. Press it in firmly
until it engages.

9 Troubleshooting

Fault
The power tool doesn't start.
No hammering action.
The power tool doesn't achieve
full power.
The drill bit doesn't rotate.
The drill bit can't be released.
The drill bit makes no progress.
22
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
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.
Possible cause
Interruption in the electric supply.
Supply cord or plug defective.
Other electrical fault.
The carbon brushes are worn.
The power tool is too cold.
The function selector switch is set to
"Drilling without hammering".
The forward/reverse switch is set to
reverse rotation.
The extension cord's conductor cross
section is inadequate.
The control switch is not pressed
fully.
The function selector switch is not
engaged or is in the "Chiseling" or
"Chisel adjustment" position.
The chuck is not pulled back fully.
The forward/reverse switch is set to
reverse rotation.
maintenance
Remedy
Plug in another electric appliance and
check whether it works.
Have the supply cord and plug
checked by a trained electrical
specialist and replaced if necessary.
Have it checked by a trained electrical
specialist.
Have the supply cord and plug
checked by a trained electrical
specialist and replaced if necessary.
Allow the power tool to warm up to
the minimum operating temperature.
See section: 7.2.1 Working at low
temperatures
Set the function selector switch to
"Hammer drilling".
Set the forward/reverse switch to for-
ward rotation.
Use an extension cord with an ad-
equate conductor cross section.
(Please refer to the "Description" sec-
tion.)
Press the control switch as far as it
will go.
When the motor has stopped, turn the
function control switch to the "Drilling
without hammering" or "Hammer
drilling" position.
Pull the chuck back as far as it will go
and remove the insert tool.
Set the forward/reverse switch to for-
ward rotation.