Troubleshooting - Hilti TE 7-A Operating Instructions Manual

NOTE
If use of the power tool continues, further battery dis-
charge will be stopped automatically before the battery
cells suffer damage.
Charge the battery with the Hilti charger approved for use
with Li-ion batteries.
NOTE
- A conditioning charge (as is required with NiCd or
NiMH batteries) is not necessary.
- Interruption of the charging procedure has no negative
effect on battery life.
- Charging can be started at any time with no negative
effect on battery life. There is no memory effect (as
with NiCd or NiMH batteries).
- For best results, batteries should be stored fully
charged in a cool dry place. Avoid charging the battery
in places subject to high ambient temperatures (e.g. at
a window) as this has an adverse effect on battery life
and increases the rate of self-discharge.

9 Troubleshooting

Fault
The power tool doesn't run.
No hammering action.
The control switch can't be
pressed, i.e. the switch is
locked.
Running speed suddenly drops
considerably.
The drive spindle rotates only
slowly.
The power tool switches itself
off automatically.
The battery runs down more
quickly than usual.
- If the battery no longer reaches full charge, it may
8.6 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.
8.7 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
The battery is discharged or fitted
incorrectly.
Electrical fault.
The battery is too hot or too cold.
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 forward / reverse switch is in the
middle position (transport lock en-
gaged).
The battery is discharged.
The permissible operating temper-
ature of the power tool's electronics
has been exceeded.
The overload cut-out has been activ-
ated.
Battery condition is not optimal.
have lost capacity due to aging or overstressing. It
is possible to continue working with a battery in this
condition but it should be replaced in good time.
maintenance
Remedy
The battery must be heard to engage
with a double click or, respectively,
needs to be charged.
Remove the battery from the power
tool and contact Hilti Service.
Bring the battery to the recommen-
ded working temperature.
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.
Push the forward / reverse switch to
the left or right.
Change the battery and recharge the
discharged battery.
Allow the power tool to cool down.
Release the control switch, reduce
the load on the power tool and then
press the switch again.
Have battery condition diagnosed by
Hilti Service or replace with a new
battery.
en
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