Troubleshooting - Hilti TE 7-A Operating Instructions Manual

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.

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 battery runs down more
quickly than usual.
The battery doesn't engage
with an audible double click.
The power tool or the battery
gets very warm.
The drill bit doesn't rotate.
8.7 Checking the power tool after care and
maintenance
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
engaged).
The battery is discharged.
Battery condition is not optimal.
The retaining lugs on the battery are
dirty.
Electrical fault.
The power tool has been overloaded
(application limits exceeded).
The function selector switch is not
engaged or is set to "Chiseling" or
"Chisel adjustment".
Remedy
The battery needs to be charged or,
respectively, it must be heard to
engage with a double click.
Remove the battery from the power
tool and contact Hilti.
Bring the battery to the recommen-
ded working temperature.
Allow the power tool to warm
up to the minimum operating
temperature.
See section: 6.1 Battery use and
care
Set the function selector switch to
"Hammer drilling".
Set the forward/reverse switch to
forward rotation.
Push the forward / reverse switch
to the left or right.
Change the battery and recharge the
discharged battery.
Have the battery condition checked
by Hilti or replace the battery.
Clean the retaining lugs and check
that the battery engages securely.
Contact Hilti Service if the problem
persists.
Switch the power tool off imme-
diately, remove the battery and
contact Hilti Service.
Use the right power tool for the job
(don't use a low-powered tool for
heavy work).
When the motor has stopped, move
the function control switch to the
"Drilling without hammering" or
"Hammer drilling" position.
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