Troubleshooting - Hilti SID 121-A Manual De Instrucciones

the battery cells. Recharge the battery as soon as a
drop in performance is noticed. The battery should
be given a conditioning charge at monthly intervals
or, at the latest, when battery capacity drops signific-
antly, using the approved Hilti charger in accordance
with its operating instructions. If battery capacity is
still unsatisfactory after the conditioning charge, we
recommend that the battery is returned to Hilti for
diagnosis.
8.5 Care of the Li-ion battery
Avoid entrance of moisture.
Charge the battery fully before using it for the first
time.
In order to achieve maximum battery life, stop dis-
charging the battery as soon as a significant drop in
performance is noticed.
NOTE
If use of the power tool continues, further battery
discharge will be stopped automatically before the
battery cells suffer damage.

9. Troubleshooting

Fault
The power tool doesn't run.
The on / off switch can't be
pressed, i.e. the switch is
locked.
Running speed suddenly
drops considerably.
The battery runs down more
quickly than usual.
The battery doesn't engage
with an audible click.
Printed: 07.07.2013 | Doc-Nr: PUB / 5070691 / 000 / 00
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 neg-
ative effect on battery life.
- Charging can be started at any time with no negative
effect 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.
- If the battery no longer reaches full charge, it may
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.
8.6 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 forward / reverse switch is in
the middle position (transport lock
engaged).
The battery is discharged.
Battery condition is not optimal.
The retaining lugs on the battery are
dirty.
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.
Push the forward / reverse switch
to the left or right.
Change the battery and recharge the
discharged battery.
Have battery condition diagnosed
by Hilti Service or replace with a
new battery.
Clean the retaining lugs and check
that the battery engages securely.
Contact Hilti Service if the problem
persists.
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