Before Use - Hilti DCH 300 Operating Instructions Manual

c) Secure the workpiece. Use clamps or a vice to
secure the workpiece. The workpiece is thus held
more securely than by hand and both hands remain
free to operate the machine.
d) Before use, check that the cutting disc has been
fitted correctly and the clamping nut tightened.
Then allow the power tool to run for 30 seconds
under no load while holding it in a secure po-
sition. Switch off the power tool immediately if
significant vibration or any other faults are no-
ticed. Should this occur, check the entire system
in order to determine the cause.
e) Take steps to ensure that flying sparks from the
power tool do not present a hazard, i.e. by striking
yourself or other persons. Adjust the position of
the disc guard accordingly.
f) Slits cut in loadbearing walls of buildings or other
structures may influence the statics of the structure,
especially when steel reinforcing bars or load-bearing
components are cut through. Consult the structural
engineer, architect, or person in charge of the
building project before beginning the work.
g) Guide the power tool carefully and make straight
cuts in order to avoid jamming the cutting disc.
Cutting curves is not permissible.
h) Guide the power tool evenly and do not apply
lateral pressure to the cutting disc. Always bring
the power tool into contact with the workpiece
at right angles. Do not attempt to alter the line
of cut by applying lateral pressure or by bending
the cutting disc while cutting is in progress. This
presents a risk of damaging or breaking the cutting
disc.
5.5 Additional safety instructions
5.5.1 Electrical safety
a) Before beginning work, check the working area
(e.g. using a metal detector) to ensure that no
concealed electric cables or gas and water pipes
are present. External metal parts of the machine may
become live, for example, when an electric cable is
damaged accidentally. This presents a serious risk of
electric shock.
b) Check the machine's supply cord at regular inter-
vals and have it replaced by a qualified specialist
if found to be damaged. If the machine's supply

6 Before use

WARNING
The supply cord must be disconnected from the elec-
tric supply and the cutting disc or drive spindle must
have come to a complete stop before attempting to
cord is damaged it must be replaced with a special
approved, ready-made supply cord available from
Hilti Customer Service. Check extension cords at
regular intervals and replace them if found to be
damaged. Do not touch the supply cord or exten-
sion cord if damaged while working. Unplug the
supply cord from the power outlet. Damaged sup-
ply cords or extension cords present a risk of electric
shock.
c) Dirty or dusty machines which have been used fre-
quently for work on conductive materials should
be checked at regular intervals at a Hilti Service
Center. Under unfavorable circumstances, damp-
ness or dust adhering to the surface of the ma-
chine, especially dust from conductive materials, may
present a risk of electric shock.
d) When working outdoors with an electric tool or
machine, check to ensure that the tool or machine
is connected to the electric supply by way of a
ground fault circuit interrupter (RCD) with a rating
of max. 30 mA (tripping current). Use of a ground
fault circuit interrupter reduces the risk of electric
shock.
e) Use of a ground fault circuit interrupter (RCD
residual current device) with a maximum tripping
current of 30 mA is recommended.
5.5.2 Work area safety
Ensure that the workplace is well ventilated. Exposure
to dust at a poorly ventilated workplace may result in
damage to the health.
5.5.3 Personal protective equipment
The user and any other persons in the vicinity must
wear suitable eye protection, a hard hat, ear protec-
tion, protective gloves and safety footwear while the
machine is in use.
change or adjust discs, parts of the tool or its ac-
cessories.
CAUTION
The mains voltage must comply with the specification
given on the type identification plate. Ensure that the
power tool is disconnected from the electric supply.
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