Operation - Hilti TE MD20 LS T Manual De Instrucciones

7. Operation

It is essential that the safety precautions printed in these
operating instructions are read and observed.
I The tool and the drilling operation emit
noise.
I Excessive noise may damage the hear-
ing.
I Wear ear protection
I Drilling may cause hazardous splinter-
ing of the material.
I Splintering material may injure parts of
the body and the eyes.
I Wear eye protection and a safety hel-
met.
-CAUTION-
Take care to ensure that you are in a secure, stable posi-
tion before switching the tool on. Check that you are able
to operate the ON / OFF switch with the hand on the rear
grip reliably at all times.
7.1 Drilling
-NOTE-
The following information printed on the grey background
has to be generally respected for all tools and in all envi-
ronsments.
1. Open the water valve on the water leg. Make sure that
water flows continuously while drilling.
2. Bring the tool with the water leg into the drilling position.
3. Switch on at the ON / OFF switch.
4. Regulate the contact pressure at the water leg so that
the drill bit runs centrally in the hole being drilled. The
tool should hammer evenly without kicking back.
5. Move the water leg as necessary, as the drilling oper-
ation continues.
-NOTE-
In the event of the drill bit head jamming in the hole
G
while drilling, proceed as follows:
Leave the power tool switched on and hold it secure-
G
ly as the forces that occur may be higher than during
normal operation (this is due to activation of the slip
clutch - the mechanical device that disconnects the
motor from the gearing).
Free the jammed drill bit by altering the drilling advance
G
pressure through adjustment of the control valve on
the water leg.
If this fails to free the jammed drill bit, switch off the
G
power tool, separate the power tool from the drill steel
and then use a suitable tool to extract the drill bit from
the hole.
Printed: 08.07.2013 | Doc-Nr: PUB / 5071845 / 000 / 01
-CAUTION-
-CAUTION-
-CAUTION-
When retracting the water leg, take care to ensure that
no parts of the body are pinched between the moving
part and the fixed part of the water leg.This presents a
risk of injury!
7.1.2 Drilling with the side handle
-NOTE-
From ergonomic point of view handheld drilling with the
side handle can only be recommended vertical down. For
applications sideways or upwards the tool may be used
with the water leg.
1. Open the ball valve on the side handle. Make sure that
water flows continuously while drilling.
2. Bring the tool into the drilling position.
3. Switch on at the ON / OFF switch.
4. Guide the tool in a way that the drill bit runs centrally
in the hole being drilled.
5. Press the tool against the underground that the tool
hammers evenly without kicking back.
-NOTE-
To handle the tool safely the maximum length of the drill
rod has to be adapted to the existing working conditions
(drilling angle, size of user, etc.). Drill deep holes where
required with drill rods with increasing lengths or work
on suitable platforms with changeable heights.
-NOTE-
In the event of the drill head jamming in the hole while
drilling, proceed as follows:
Leave the power tool switched on and hold it secure-
G
ly as the forces that occur may be higher than during
normal operation (this is due to activation of the slip
clutch - the mechanical device that disconnects the
motor from the gearing).
Free the jammed drill bit by altering the drilling advance
G
pressure through adjustment of the control valve on
the water leg.
If this fails to free the jammed drill bit, switch off the
G
power tool, separate the power tool from the drill steel
and then use a suitable tool to extract the drill bit from
the hole.
7.2 Finishing drilling
1. Pull the drill steel and drill head out of the hole while
the tool is still running.
2. Switch off at the ON / OFF switch.
3. Close the water valve on the water leg / side handle.
Removing the drill bit: Lay the drill steel down flat on a
hard surface so that the full length of the drill bit is in con-
tact with this surface. Strike the side of the drill bit with
a hammer several times while rotating the drill steel
between each hammer blow. The hammer blows should
cause the drill bit to be released from the drill steel. Take
care to avoid damage to the drill steel.
23