8.4 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.
8.5 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.
9 Troubleshooting
Fault Possible cause Remedy
The power tool doesn’t start.
Interruption in the electric supply. Plug in another electric appliance and
check whether it works.
The supply cord or plug is defective. Have it checked by a trained electrical
specialist and replaced if necessary.
Generator with sleep mode. Apply a load to the generator by con-
necting another appliance (e.g. a
lamp). Subsequently switch the power
tool off and on again.
Other electrical fault. Have it checked by a trained electrical
specialist.
The electronic restart interlock is acti-
vated after an interruption in the elec-
tric supply.
Switch the power tool off and on
again. Release the control switch
lock.
No hammering action. The power tool is too cold. Allow the power tool to warm up to
the minimum operating temperature.
See section: 7.2.1 Hammer drilling 6
The power tool doesn’t start
and the LED blinks red.
A fault has occurred in the power tool. If necessary, the power tool should be
repaired by Hilti Service.
The power tool doesn’t start
and the LED lights red.
The carbon brushes are worn. Have it checked by a trained electrical
specialist and replaced if necessary.
The power tool doesn’t achieve
full power.
The extension cord is too long or its
gauge is inadequate.
Use an extension cord of an
approved length and / or of adequate
gauge.
The control switch is not pressed
fully.
Press the control switch as far as it
will go.
The reduced-power button is en-
gaged (depends on version).
Press the reduced-power button.
The voltage provided by the electric
supply is too low.
Connect the power tool to a different
power source.
The drill bit doesn't rotate (only
combihammers).
The function selector switch is not
engaged or is in the “Chiseling” or
“Chisel adjustment” position.
Move the function selector switch to
the “Hammer drilling” position when
the motor has stopped.
The drill bit/chisel can not be
released from the unlocking de-
vice.
The chuck is not pulled back fully. Pull the insert tool unlocking device
back as far as it will go and remove
the insert tool.
The side handle is not fitted correctly. Release the side handle and refit
it correctly so that the clamping
band and side handle engage in the
groove.
en
10
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