Care And Maintenance; Troubleshooting - Hilti TE 4-A22 Operating Instructions Manual

6 Care and maintenance

WARNING
Repairs to the electrical section of the power tool may
be carried out only by trained electrical specialists.
6.1 Care of the power tool
CAUTION
en
Keep the power tool, especially its grip surfaces,
clean and free from oil and grease. Do not use clean-
ing agents which contain silicone.
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.
6.2 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.

7 Troubleshooting

Fault
The power tool doesn't run and
1 LED blinks.
The tool doesn't work and all 4
LEDs blink.
The power tool doesn't run.
No hammering action.
The control switch can't be
pressed, i.e. the switch is
locked.
The drive spindle doesn't rotate.
16
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.
6.3 Care of the Li‑ion battery
NOTE
Battery performance drops at low temperatures.
NOTE
Store the battery in a cool and dry place.
In order to achieve maximum battery life, stop using the
battery as soon as a significant drop in battery perform-
ance is noticed.
NOTE
- If use continues, further battery discharge will be
- Charge the batteries using the specified and approved
Possible cause
The battery is discharged.
The battery is too hot or too cold.
The power tool has been overloaded.
The battery is discharged or is not
pushed all the way in.
Electrical fault.
The tool is too cold.
The function selector switch is set to
"Drilling without hammering".
The forward/reverse switch is set to
reverse rotation.
The forward / reverse switch is in the
middle position (transport lock en-
gaged).
The permissible operating temper-
ature of the power tool's electronics
has been exceeded.
stopped automatically before the battery cells suffer
damage.
Hilti battery chargers for Li‑ion batteries.
Remedy
Change the battery and charge the
empty battery.
Bring the battery to the recommen-
ded working temperature.
Release the control switch and press
it again.
The battery must be heard to engage
with a double click or, respectively,
needs to be charged.
Remove the battery from the tool and
contact Hilti Service.
Bring the power tool to the operating
temperature by pressing the insert
tool lightly against the work surface
and allowing the power tool to run
briefly under no load.
Set the function selector switch to
"Hammer drilling".
Set the forward/reverse switch to for-
ward rotation.
Push the forward / reverse switch to
the left or right.
Allow the power tool to cool down.