Troubleshooting – Hilti TE 7-C User Manual

Page 14

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The outer casing of the power tool is made from
impact-resistant plastic. Sections of the grip are made
from a synthetic rubber material.
Never operate the power tool when the ventilation
slots are blocked. Clean the ventilation slots carefully
using a dry brush. Do not permit foreign objects to
enter the interior of the power tool. Clean the outside
of the power tool at regular intervals with a slightly
damp cloth. Do not use a spray, steam pressure
cleaning equipment or running water for cleaning.
This may negatively affect the electrical safety of the
power tool.

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 shield and
then fit a new dust shield. Press it in firmly until it

8.4 Maintenance

Repairs to the electrical section of the power tool
may be carried out only by trained electrical spe-

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.

9. Troubleshooting


Possible cause


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 spe-
cialist and replaced if necessary.

Other electrical fault.

Have it checked by a trained elec-
trical specialist.

The carbon brushes are worn.

Have the supply cord and plug
checked by a trained electrical spe-
cialist and replaced if necessary.

No hammering action.

The power tool is too cold.

Allow the power tool to warm up to
the minimum operating temperat-
See section: 7.2.1 Working at low

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
forward rotation.