Hilti DD 150-U Mode D'emploi page 23

7.6 Wet drilling using the drill stand 24 25
en
WARNING
Water must not be allowed to run over the motor and
cover.
WARNING
A water collection system with wet-type vacuum
cleaner must be used when drilling in an upwards
direction.
WARNING
Stop working if the vacuum removal system no longer
functions.
WARNING
The end stop screw must be fitted at the end of the
guide rail when drilling in an upwards direction.
CAUTION
Releasing the tilt mechanism on the drill stand may
cause the column to tilt suddenly.
NOTE
Start the wet-type vacuum cleaner manually before open-
ing the water supply valve and switch it off again manually
when the drilling operation is completed and after closing
the water supply valve.
NOTE
Do not use the power outlet on the vacuum cleaner.
1. Open the water flow regulator on the side handle
slowly until the desired volume of water is flowing.
The indicator on the side handle can be used to
check the water flow.
2. Use the switch locking device to switch the machine
on for sustained operation.
The drilling performance indicator lights orange.
3. Release the carriage locking mechanism.
16
4. Turn the hand wheel until the diamond core bit is in
contact with the work surface.
5. When beginning drilling, apply only light pressure
until the core bit has centered itself and then in-
crease the pressure.
6. Regulate the contact pressure while observing the
drilling performance indicator.
NOTE The drilling performance indicator lights or-
ange after switching on. Optimum drilling perfor-
mance is achieved when the drilling performance
indicator shows a green light. If the drilling per-
formance indicator shows a red light, reduce the
pressure applied to the core bit.
7.7 Using the Rota-Rail (column swivel)
CAUTION
Do not use the Rota-Rail as a column extension.
The Rota-Rail allows quick and easy access to the hole
being drilled, or to the core, with no need to partly or fully
dismantle the system.
1. Switch the machine off.
2. Lock the carriage on the channel by engaging the
carriage locking mechanism and check that it is
securely attached.
3. Remove the end stop screw from the end of the rail.
4. Attach the Rota-Rail so that the toothed racks are
facing the same direction.
5. Tighten the screw on the Rota-Rail securely.
6. Release the carriage lock and run the carriage along
the rail onto the Rota-Rail.
7. Release the Rota-Rail fastening screw and pivot the
machine with the Rota-Rail to the left or right to
provide access to the hole being drilled.
8. Remove the core or change the core bit.
9. Pivot the machine back to its original position,
tighten the Rota-Rail fastening screw securely and
then run the carriage back onto the column of the
drill stand in order to continue drilling.
10. After removing the Rota-Rail, refit the end stop
screw to the end of the rail.
7.8 Procedure in the event of the core bit sticking
In the event of the core bit sticking, the clutch will slip
until the user switches the power tool off. The core bit
can be released by taking the following action:
7.8.1 Using an open-end wrench to release the
core bit
1. Disconnect the supply cord plug from the power
outlet.
2. Grip the core bit with a suitable open-end wrench
close to the connection end and release the core bit
by rotating it.
3. Plug the machine's supply cord into the power out-
let.
4. Resume the drilling operation.