Hilti DD 350-CA Mode D'emploi page 42

4. Check that the carriage is locked by trying to turn
the hand wheel slightly.
5. Close the water flow regulator.
6. Switch off the vacuum cleaner (if used).
7. When ending an overhead drilling operation, first
drain the water out of the core bit. To do this,
remove the water drainage plug, connect a water
drainage hose (accessory) to the water outlet and
en
then turn the 3-way valve to the middle position.
8. Disconnect the supply cord plug from the power
outlet or switch off at the PRCD (ground fault circuit
interrupter).
9. Remove the core.
6.7 Procedure in the event of the core bit sticking
The safety clutch releases in the event of the core bit
binding and sticking. Following this, the motor is switched
off by the electronic control system. The core bit can be
released by taking the following action:
6.7.1 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 core drilling machine's supply cord into the
power outlet.
4. Resume the drilling operation.
6.7.2 Releasing the core bit with the hand wheel
1. Disconnect the supply cord plug from the power
outlet.
2. Lift the core bit out of the hole by turning the hand
wheel.
3. Plug the core drilling machine's supply cord into the
power outlet.
4. Resume the drilling operation.
6.8 Removing the diamond core bit 17
CAUTION
The core bit may get hot during use or during sharpening.
There is a risk of burning your hands. Wear protective
gloves when changing the core bit.
1. Disconnect the supply cord plug from the power
outlet.
2. Lock the carriage on the rail.
3. Check that the carriage is locked by trying to turn
the hand wheel slightly.
4. Turn the chuck in the direction of the open brackets
symbol.
5. Remove the core bit.
34
6.9 Removing the core drilling machine from the
drill stand 18
1. Disconnect the supply cord plug from the power
outlet.
2. Lock the carriage on the rail.
NOTE The carriage is locked when the locking pin
is engaged in the locked position.
In this position, no movement of the carriage is
possible.
3. Check that the carriage is locked by trying to turn
the hand wheel slightly.
4. Hold the core drilling machine securely with one
hand on the carrying grip. The machine may other-
wise fall to the floor.
5. Release the eccentric pin in the core drilling machine
mount.
6. Pull the eccentric pin out of the core drilling machine
mount.
7. Remove the core drilling machine from the carriage.
8. Push the eccentric pin into the carriage as far as it
will go.
6.10 Storage of the equipment and breaks between
work at temperatures below freezing
DANGER
At temperatures below 4°C (39°F) the water in the
cooling circuit must be blown out with compressed
air when drilling is interrupted for more than on hour
or before the equipment is stowed away.
1. Switch off the water supply.
2. Disconnect the water supply hose from the core
drilling machine.
3. Open the water flow regulator.
4. Set the 3-way valve to "Wet drilling".
5. Use compressed air (max. 3 bar) to blow the water
out of the water circuit.
6.11 Disposal of drilling slurry
Please refer to the "Disposal" section.
6.12 Transport and storage
Open the water flow regulator before putting the core
drilling machine into storage.
CAUTION
When temperatures drop below zero, check to ensure
that no water remains in the power tool.
WARNING
Do not lift the core drilling machine and/or the drill
stand by crane.
DANGER
Transport the drilling feed unit, core drilling machine,
drill stand and core bit as separate units.
Use the wheel assembly (accessory) as an aid when
transporting the equipment.