Before Use; Fitting The Drill Bit; Water Connection; Electrical Connection - Hilti TE MD20 LS T Manual De Instrucciones

The tool may be operated, serviced and repaired only
by authorised, trained personnel. This personnel must
be informed of any special hazards that may be encoun-
tered.
5.8.4 Personal protective equipment
The user and persons in the immediate vicinity must wear
suitable eye protection, a safety helmet, ear protection, pro-
tective gloves and safety footwear when the tool is in use.

6. Before use

It is essential that safety rules printed in these operating
instructions are read and observed.
-CAUTION-
The tool must be disconnected from the mains supply
while being set up and made ready for use.

6.1 Fitting the drill bit

Parts used: TE-MDR and TE-MDH
Push the drill bit head onto the front end of the drill steel
and tap it lightly until it holds securely.
I The tool, drill bit and drill support are
heavy.
I There is a risk of pinching parts of the
body.
I Wear a safety helmet, protective gloves
and safety footwear.
I The drill bit may become hot during use.
I There is a risk of burning the hands.
I Wear protective gloves when changing
drill bits.
6.2 Fitting the drill steel
Use TE-MDR drill steels or drill steels according Hilti
specification with appropriate fit to the tool only.
Printed: 08.07.2013 | Doc-Nr: PUB / 5071845 / 000 / 01
-CAUTION-
-CAUTION-
(Comment: Hilti rods differ in length and shape of the
connecting part to standard rods)
1. Clean away any dirt adhering to the connection end
and apply a little grease to it.
2. Screw the drill steel fully into the connection end.
3. Guide the connection end into the chuck and rotate it
until the grooves and splines are in alignment and then
push it in as far as it will go.
4. Close the chuck locking mechanism and check that
the connection end is held securely.
6.3 Fitting the water leg/side handle
Use only the TE-MW water leg (with fitted TE-MW 2G or
TE-MW 4G support base) intended for use with the power
tool, or the TE-MAG side handle as water supply is assu-
red only when these parts are used.
1. Clean off any dirt adhering to the connecting pin on
the water leg / side handle.
2. Position the guide on the underside of the front hous-
ing of the tool on the water leg / side handle and insert
the connecting pin in the hole provided.
3. Secure the connection by inserting the retaining pin
in the hole in the connecting pin.
4. The securing plate on the connecting pin must be
released before separating the tool from the water leg
/ side handle (e.g. for transport). The water leg / side
handle can then be pulled away fromthe tool.

6.4 Water connection

-NOTE-
The following information printed on the grey background
has to be generally respected for all tools and in all envi-
ronsments.
The tool and drill bit are water-cooled and the water has
a flushing function during drilling.
– Water pressure: min. 3 bar, max. 5 bar
– Water temperature: approx. 10–20°C
– Cooling water flow rate: approx. 10 l/min
– Permissible degree of water pollution: <40 µm.
-NOTE-
In order to ensure that the maximum permitted water
pressure of 5 bar at the power tool is not exceeded, a
pressure reduction valve is incorporated in the the TE-
MW water leg and in the TE-MAG side handle. The maxi-
mum water pressure in the supply line to the pressure
reduction valve in the water leg or side handle must not
exceed p = 20 bar.
max
The cooling water is supplied to the tool through a stud
on the water leg saddle/ side handle which is connected
to the water supply.
If the Hilti TE-MW water legs or TE-MAG side handles
are used, connection to them is by way of a 1" tapered
sleeve.
Check the flow of water. Water must spray out of the
bores in the drill bit.

6.5 Electrical connection

6.5.1 General points
The tool must be powered by an alternating current sup-
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