Hilti DD 120 Mode D'emploi page 15

CAUTION
Do not change gear while the machine is running.
Wait for the spindle to come to a halt.
NOTE
To avoid damage to the components, use only fresh
water containing no dirt particles.
NOTE
A flow meter (accessory) may be fitted between the
machine's water supply connector and the water supply
hose.
1. Connect the water regulator to the machine.
2. Connect the water supply (hose coupling).
6.1.6 Fitting the water collection system
(accessory) 5
WARNING
Use of the water collection system in conjunction with
a wet-type industrial vacuum cleaner is a mandatory
requirement for work on ceilings. The machine must
be positioned at an angle of 90° to the ceiling. The
seal used must be of the correct size for the diamond
core bit diameter.
NOTE
Use of the water collection system allows water to be
led away in controlled fashion, thus avoiding a mess
or damage to the surrounding area. Best results are
achieved with a wet-type industrial vacuum cleaner.
1. Release the hexagon-head screw at the front of the
rail.
2. Push the water collector holder into position.
3. Fit the hexagon-head screw and tighten it.
4. Fit the water collector between the two moveable
arms of the water collector holder.
5. Press the water collector against the base material
by turning the two screws on the water collector
holder.
6. Connect a wet-type industrial vacuum cleaner to the
water collector or fit a length of hose through which
the water can drain away.
6.1.7 Fitting the diamond core bit 6
DANGER
Do not use damaged core bits. Check the core bits for
chipping, cracks, or heavy wear each time before use.
Do not use damaged tools. Fragments of the workpiece
or a broken core bit may be ejected and cause injury
beyond the immediate area of operation.
NOTE
Diamond core bits must be replaced when the cutting
performance and/or rate of drilling progress drops sig-
nificantly. This generally is the case when the segments
reach a height of less than 2 mm.
DANGER
To avoid injury, use only genuine Hilti core bits and
DD 120 accessories. If using a machine with a BI+
chuck, only genuine Hilti core bits may be used with
it.
CAUTION
The core bit may become hot during use or during sharp-
ening. There is a risk of burning your hands. Wear pro-
tective gloves when changing the core bit.
DANGER
Fitting and positioning the core bit incorrectly can lead
to hazardous situations as this may cause parts to break
and fly off. Check that the core bit is seated correctly.
CAUTION
Disconnect the supply cord plug from the power out-
let.
NOTE
C-Rod, A-Rod, M27, and BR chucks are operated with a
27 mm AF open-end wrench.
1. Use the carriage brake to lock the carriage in posi-
tion on the rail and check that the system compo-
nents are securely mounted.
2. Open the chuck (BI+) by turning it in the direction of
the open brackets symbol.
3. Push the diamond core bit into the chuck (BI+) from
below, turning the core bit until the teeth in the
chuck engage with the core bit.
4. Close the chuck (BI+) by turning it in the direction of
the closed brackets symbol.
5. Check that the diamond core bit is securely mounted
in the chuck by pulling on the core bit and attempting
to move it from side to side.
6.1.8 Selecting the speed 7
CAUTION
Do not change gear while the machine is running.
Wait for the spindle to come to a halt.
1. Set the selector switch according to the core bit
diameter used. Turn the selector switch to the rec-
ommended setting (see section "Description") while
rotating the core bit by hand.
6.1.9 Removing the diamond core bit
CAUTION
The core bit may become hot during use or during sharp-
ening. There is a risk of burning your hands. Wear pro-
tective gloves when changing the core bit.
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