6.2.2.4 Contact pressure
If inadequate pressure is applied, the chisel will jump
around uncontrollably.
Application of excessive pressure will result in a loss of
chiseling performance.
7 Care and maintenance
WARNING
Repairs to the electrical section of the power tool may
be carried out only by trained electrical specialists.
7.1 Care of the power tool
CAUTION
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.
7.2 Service indicator
8
NOTE
The power tool is equipped with a service indicator.
Indicator
Constant red light
End of service interval - servicing is due.
After the lamp lights for the first time,
the power tool may continue to be used
for several hours before the automatic
cut-out is activated. To ensure that the
power tool is always ready for use, it
should be returned to Hilti for servicing
in good time.
7.3 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.
It is essential that the dust shield is replaced if the sealing
lip is found to be damaged.
8 Troubleshooting
Fault
Possible cause
Remedy
The power tool doesn’t start.
Initialization of the electronics is in
progress (takes up to approx. 1 sec.
after plugging in) or the electronic
restarting interlock has become acti-
vated after an interruption in the elec-
tric supply.
Switch the power tool off and on
again.
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.
The control switch 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.
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.
en
6
Printed: 14.10.2015 | Doc-Nr: PUB / 5210095 / 000 / 01
