Care And Maintenance; Service Indicator - Hilti DCH 300 Mode D'emploi

7.6 Using a suitable vacuum cleaner for working on
mineral materials
NOTE
Please read the operating instructions for the vacuum
cleaner for information about disposal of the material
collected.

8 Care and maintenance

CAUTION
Disconnect the supply cord plug from the power out-
let.
8.1 Care of the power tool
DANGER
Under extreme conditions, when used for working on
metal, conductive dust may accumulate inside the tool.
This may have an adverse effect on the tool's protective
insulation. Under such conditions, the tool should be
plugged into a ground fault circuit interrupter (RCD)
and use of a stationary dust removal system and

8.2 Service indicator

NOTE
The power tool is equipped with a service indicator.
LED indicators
8.3 Maintenance
WARNING
Repairs to the electrical section of the machine 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
Use of a suitable vacuum cleaner (such as the Hilti
VCU 40, VCU 40‑M or VCD 50) makes it possible to
keep dust to a minimum while working with the tool. Use
of a vacuum cleaner also helps to cool the segments
on the disc and thus reduces segment wear. In order to
avoid electrostatic effects, a vacuum cleaner equipped
with an antistatic hose should be used.
frequent cleaning of the tool's cooling air slots is
recommended.
The outer casing of the motor and the grips are made
from impact-resistant plastic. Parts of the grips have a
synthetic rubber covering.
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. Always keep the grip
surfaces of the power tool free from oil and grease. Do
not use cleaning agents which contain silicone.
Constant red light
Blinking red light
damaged or when the controls do not function faultlessly.
If necessary, the power tool should be repaired by Hilti
Service.
8.4 Checking the power tool after care and
maintenance
After carrying out care and maintenance, check that all
protective and safety devices are fitted and that they
function faultlessly.
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 (switched-on running
time) before the automatic cut-out is ac-
tivated. To ensure that the power tool
is always ready for use, it should be re-
turned to Hilti for servicing in good time.
See section "Troubleshooting".
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