Before Use - Hilti DD 120 Original Operating Instructions

at regular intervals and replace them if found to
be damaged.
f) When working outdoors, use only extension cords
that are approved and correspondingly marked
for this application.
g) In case of an interruption in the electric supply:
Switch the machine off and unplug the supply
cord.
h) Avoid using extension cords with multiple power
outlets and the simultaneous use of several elec-
tric tools or machines connected to one extension
cord.
i) Never operate the machine when it is dirty or
wet. Dust (especially dust from conductive mate-
rials) or dampness adhering to the surface of the
machine may, under unfavorable conditions, lead
to electric shock. Dirty or dusty machines should
thus be checked at a Hilti service center at regular
intervals, especially if used frequently for working
on conductive materials.
5.2.5 Thermal
Wear protective gloves when changing core bits. The
core bit may become hot during use.

6 Before use

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.
DANGER
When drilling through walls, cover the area behind
the wall, as material or the core may fall out on the
other side of the wall. When drilling through ceilings,
secure (cover) the area below as drilled material or
the core may drop out and fall down.
DANGER
Check that the drill stand is securely fastened to the
base material.
CAUTION
Do not break the connection to earth by using an
adaptor plug.
5.2.6 Requirements to be met by users
a) The machine is intended for professional use.
b) The machine may be operated, serviced and re-
paired only by authorized, trained personnel. This
personnel must be informed of any special haz-
ards that may be encountered.
c) Stay alert, watch what you are doing and use
common sense when operating a power tool. Do
not use a power tool while you are tired or under
the influence of drugs, alcohol or medication. A
moment of inattention while operating power tools
may result in serious personal injury.
d) Improve the blood circulation in your fingers by
relaxing your hands and exercising your fingers
during breaks between working.
5.2.7 Personal protective equipment
The user and any other persons in the vicinity must
wear ANSI Z87.1-approved eye protection, a hard
hat, ear protection, protective gloves and breathing
protection while the machine is in use.
6.1 Preparing for use
CAUTION
The machine and the diamond core bit are heavy. There
is a risk of pinching parts of the body. Wear a hard hat,
protective gloves and safety boots.
6.1.1 Fitting the handwheel 4
NOTE
The handwheel may be fitted on the left-hand or right-
hand side of the carriage.
1. Fit the handwheel onto the shaft on the left-hand or
right-hand side of the carriage.
2. Secure the handwheel with the retaining pin.
6.1.2 Fastening the drilling system with an
anchor 3
WARNING
Use an anchor suitable for the material on which you
are working and observe the anchor manufacturer's
instructions.
en
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